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|
- diff -Nur linux-4.1.39.orig/arch/alpha/mm/fault.c linux-4.1.39/arch/alpha/mm/fault.c
- --- linux-4.1.39.orig/arch/alpha/mm/fault.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/alpha/mm/fault.c 2017-04-18 17:56:30.549394649 +0200
- @@ -23,8 +23,7 @@
- #include <linux/smp.h>
- #include <linux/interrupt.h>
- #include <linux/module.h>
- -
- -#include <asm/uaccess.h>
- +#include <linux/uaccess.h>
-
- extern void die_if_kernel(char *,struct pt_regs *,long, unsigned long *);
-
- @@ -107,7 +106,7 @@
-
- /* If we're in an interrupt context, or have no user context,
- we must not take the fault. */
- - if (!mm || in_atomic())
- + if (!mm || faulthandler_disabled())
- goto no_context;
-
- #ifdef CONFIG_ALPHA_LARGE_VMALLOC
- diff -Nur linux-4.1.39.orig/arch/arc/include/asm/futex.h linux-4.1.39/arch/arc/include/asm/futex.h
- --- linux-4.1.39.orig/arch/arc/include/asm/futex.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/arc/include/asm/futex.h 2017-04-18 17:56:30.549394649 +0200
- @@ -53,7 +53,7 @@
- if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
- return -EFAULT;
-
- - pagefault_disable(); /* implies preempt_disable() */
- + pagefault_disable();
-
- switch (op) {
- case FUTEX_OP_SET:
- @@ -75,7 +75,7 @@
- ret = -ENOSYS;
- }
-
- - pagefault_enable(); /* subsumes preempt_enable() */
- + pagefault_enable();
-
- if (!ret) {
- switch (cmp) {
- @@ -104,7 +104,7 @@
- return ret;
- }
-
- -/* Compare-xchg with preemption disabled.
- +/* Compare-xchg with pagefaults disabled.
- * Notes:
- * -Best-Effort: Exchg happens only if compare succeeds.
- * If compare fails, returns; leaving retry/looping to upper layers
- @@ -121,7 +121,7 @@
- if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
- return -EFAULT;
-
- - pagefault_disable(); /* implies preempt_disable() */
- + pagefault_disable();
-
- /* TBD : can use llock/scond */
- __asm__ __volatile__(
- @@ -142,7 +142,7 @@
- : "r"(oldval), "r"(newval), "r"(uaddr), "ir"(-EFAULT)
- : "cc", "memory");
-
- - pagefault_enable(); /* subsumes preempt_enable() */
- + pagefault_enable();
-
- *uval = val;
- return val;
- diff -Nur linux-4.1.39.orig/arch/arc/mm/fault.c linux-4.1.39/arch/arc/mm/fault.c
- --- linux-4.1.39.orig/arch/arc/mm/fault.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/arc/mm/fault.c 2017-04-18 17:56:30.549394649 +0200
- @@ -86,7 +86,7 @@
- * If we're in an interrupt or have no user
- * context, we must not take the fault..
- */
- - if (in_atomic() || !mm)
- + if (faulthandler_disabled() || !mm)
- goto no_context;
-
- if (user_mode(regs))
- diff -Nur linux-4.1.39.orig/arch/arm/include/asm/cmpxchg.h linux-4.1.39/arch/arm/include/asm/cmpxchg.h
- --- linux-4.1.39.orig/arch/arm/include/asm/cmpxchg.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/arm/include/asm/cmpxchg.h 2017-04-18 17:56:30.549394649 +0200
- @@ -129,6 +129,8 @@
-
- #else /* min ARCH >= ARMv6 */
-
- +#define __HAVE_ARCH_CMPXCHG 1
- +
- extern void __bad_cmpxchg(volatile void *ptr, int size);
-
- /*
- diff -Nur linux-4.1.39.orig/arch/arm/include/asm/futex.h linux-4.1.39/arch/arm/include/asm/futex.h
- --- linux-4.1.39.orig/arch/arm/include/asm/futex.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/arm/include/asm/futex.h 2017-04-18 17:56:30.549394649 +0200
- @@ -93,6 +93,7 @@
- if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
- return -EFAULT;
-
- + preempt_disable();
- __asm__ __volatile__("@futex_atomic_cmpxchg_inatomic\n"
- "1: " TUSER(ldr) " %1, [%4]\n"
- " teq %1, %2\n"
- @@ -104,6 +105,8 @@
- : "cc", "memory");
-
- *uval = val;
- + preempt_enable();
- +
- return ret;
- }
-
- @@ -124,7 +127,10 @@
- if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
- return -EFAULT;
-
- - pagefault_disable(); /* implies preempt_disable() */
- +#ifndef CONFIG_SMP
- + preempt_disable();
- +#endif
- + pagefault_disable();
-
- switch (op) {
- case FUTEX_OP_SET:
- @@ -146,7 +152,10 @@
- ret = -ENOSYS;
- }
-
- - pagefault_enable(); /* subsumes preempt_enable() */
- + pagefault_enable();
- +#ifndef CONFIG_SMP
- + preempt_enable();
- +#endif
-
- if (!ret) {
- switch (cmp) {
- diff -Nur linux-4.1.39.orig/arch/arm/include/asm/switch_to.h linux-4.1.39/arch/arm/include/asm/switch_to.h
- --- linux-4.1.39.orig/arch/arm/include/asm/switch_to.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/arm/include/asm/switch_to.h 2017-04-18 17:56:30.549394649 +0200
- @@ -3,6 +3,13 @@
-
- #include <linux/thread_info.h>
-
- +#if defined CONFIG_PREEMPT_RT_FULL && defined CONFIG_HIGHMEM
- +void switch_kmaps(struct task_struct *prev_p, struct task_struct *next_p);
- +#else
- +static inline void
- +switch_kmaps(struct task_struct *prev_p, struct task_struct *next_p) { }
- +#endif
- +
- /*
- * For v7 SMP cores running a preemptible kernel we may be pre-empted
- * during a TLB maintenance operation, so execute an inner-shareable dsb
- @@ -22,6 +29,7 @@
-
- #define switch_to(prev,next,last) \
- do { \
- + switch_kmaps(prev, next); \
- last = __switch_to(prev,task_thread_info(prev), task_thread_info(next)); \
- } while (0)
-
- diff -Nur linux-4.1.39.orig/arch/arm/include/asm/thread_info.h linux-4.1.39/arch/arm/include/asm/thread_info.h
- --- linux-4.1.39.orig/arch/arm/include/asm/thread_info.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/arm/include/asm/thread_info.h 2017-04-18 17:56:30.549394649 +0200
- @@ -50,6 +50,7 @@
- struct thread_info {
- unsigned long flags; /* low level flags */
- int preempt_count; /* 0 => preemptable, <0 => bug */
- + int preempt_lazy_count; /* 0 => preemptable, <0 => bug */
- mm_segment_t addr_limit; /* address limit */
- struct task_struct *task; /* main task structure */
- __u32 cpu; /* cpu */
- @@ -147,6 +148,7 @@
- #define TIF_SIGPENDING 0
- #define TIF_NEED_RESCHED 1
- #define TIF_NOTIFY_RESUME 2 /* callback before returning to user */
- +#define TIF_NEED_RESCHED_LAZY 3
- #define TIF_UPROBE 7
- #define TIF_SYSCALL_TRACE 8
- #define TIF_SYSCALL_AUDIT 9
- @@ -160,6 +162,7 @@
- #define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
- #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
- #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
- +#define _TIF_NEED_RESCHED_LAZY (1 << TIF_NEED_RESCHED_LAZY)
- #define _TIF_UPROBE (1 << TIF_UPROBE)
- #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
- #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
- diff -Nur linux-4.1.39.orig/arch/arm/Kconfig linux-4.1.39/arch/arm/Kconfig
- --- linux-4.1.39.orig/arch/arm/Kconfig 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/arm/Kconfig 2017-04-18 17:56:30.549394649 +0200
- @@ -31,7 +31,7 @@
- select HARDIRQS_SW_RESEND
- select HAVE_ARCH_AUDITSYSCALL if (AEABI && !OABI_COMPAT)
- select HAVE_ARCH_BITREVERSE if (CPU_32v7M || CPU_32v7) && !CPU_32v6
- - select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL
- + select HAVE_ARCH_JUMP_LABEL if (!XIP_KERNEL && !PREEMPT_RT_BASE)
- select HAVE_ARCH_KGDB
- select HAVE_ARCH_SECCOMP_FILTER if (AEABI && !OABI_COMPAT)
- select HAVE_ARCH_TRACEHOOK
- @@ -66,6 +66,7 @@
- select HAVE_PERF_EVENTS
- select HAVE_PERF_REGS
- select HAVE_PERF_USER_STACK_DUMP
- + select HAVE_PREEMPT_LAZY
- select HAVE_RCU_TABLE_FREE if (SMP && ARM_LPAE)
- select HAVE_REGS_AND_STACK_ACCESS_API
- select HAVE_SYSCALL_TRACEPOINTS
- diff -Nur linux-4.1.39.orig/arch/arm/kernel/asm-offsets.c linux-4.1.39/arch/arm/kernel/asm-offsets.c
- --- linux-4.1.39.orig/arch/arm/kernel/asm-offsets.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/arm/kernel/asm-offsets.c 2017-04-18 17:56:30.549394649 +0200
- @@ -65,6 +65,7 @@
- BLANK();
- DEFINE(TI_FLAGS, offsetof(struct thread_info, flags));
- DEFINE(TI_PREEMPT, offsetof(struct thread_info, preempt_count));
- + DEFINE(TI_PREEMPT_LAZY, offsetof(struct thread_info, preempt_lazy_count));
- DEFINE(TI_ADDR_LIMIT, offsetof(struct thread_info, addr_limit));
- DEFINE(TI_TASK, offsetof(struct thread_info, task));
- DEFINE(TI_CPU, offsetof(struct thread_info, cpu));
- diff -Nur linux-4.1.39.orig/arch/arm/kernel/entry-armv.S linux-4.1.39/arch/arm/kernel/entry-armv.S
- --- linux-4.1.39.orig/arch/arm/kernel/entry-armv.S 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/arm/kernel/entry-armv.S 2017-04-18 17:56:30.549394649 +0200
- @@ -208,11 +208,18 @@
- #ifdef CONFIG_PREEMPT
- get_thread_info tsk
- ldr r8, [tsk, #TI_PREEMPT] @ get preempt count
- - ldr r0, [tsk, #TI_FLAGS] @ get flags
- teq r8, #0 @ if preempt count != 0
- + bne 1f @ return from exeption
- + ldr r0, [tsk, #TI_FLAGS] @ get flags
- + tst r0, #_TIF_NEED_RESCHED @ if NEED_RESCHED is set
- + blne svc_preempt @ preempt!
- +
- + ldr r8, [tsk, #TI_PREEMPT_LAZY] @ get preempt lazy count
- + teq r8, #0 @ if preempt lazy count != 0
- movne r0, #0 @ force flags to 0
- - tst r0, #_TIF_NEED_RESCHED
- + tst r0, #_TIF_NEED_RESCHED_LAZY
- blne svc_preempt
- +1:
- #endif
-
- svc_exit r5, irq = 1 @ return from exception
- @@ -227,8 +234,14 @@
- 1: bl preempt_schedule_irq @ irq en/disable is done inside
- ldr r0, [tsk, #TI_FLAGS] @ get new tasks TI_FLAGS
- tst r0, #_TIF_NEED_RESCHED
- + bne 1b
- + tst r0, #_TIF_NEED_RESCHED_LAZY
- reteq r8 @ go again
- - b 1b
- + ldr r0, [tsk, #TI_PREEMPT_LAZY] @ get preempt lazy count
- + teq r0, #0 @ if preempt lazy count != 0
- + beq 1b
- + ret r8 @ go again
- +
- #endif
-
- __und_fault:
- diff -Nur linux-4.1.39.orig/arch/arm/kernel/patch.c linux-4.1.39/arch/arm/kernel/patch.c
- --- linux-4.1.39.orig/arch/arm/kernel/patch.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/arm/kernel/patch.c 2017-04-18 17:56:30.549394649 +0200
- @@ -15,7 +15,7 @@
- unsigned int insn;
- };
-
- -static DEFINE_SPINLOCK(patch_lock);
- +static DEFINE_RAW_SPINLOCK(patch_lock);
-
- static void __kprobes *patch_map(void *addr, int fixmap, unsigned long *flags)
- __acquires(&patch_lock)
- @@ -32,7 +32,7 @@
- return addr;
-
- if (flags)
- - spin_lock_irqsave(&patch_lock, *flags);
- + raw_spin_lock_irqsave(&patch_lock, *flags);
- else
- __acquire(&patch_lock);
-
- @@ -47,7 +47,7 @@
- clear_fixmap(fixmap);
-
- if (flags)
- - spin_unlock_irqrestore(&patch_lock, *flags);
- + raw_spin_unlock_irqrestore(&patch_lock, *flags);
- else
- __release(&patch_lock);
- }
- diff -Nur linux-4.1.39.orig/arch/arm/kernel/process.c linux-4.1.39/arch/arm/kernel/process.c
- --- linux-4.1.39.orig/arch/arm/kernel/process.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/arm/kernel/process.c 2017-04-18 17:56:30.549394649 +0200
- @@ -290,6 +290,30 @@
- }
-
- #ifdef CONFIG_MMU
- +/*
- + * CONFIG_SPLIT_PTLOCK_CPUS results in a page->ptl lock. If the lock is not
- + * initialized by pgtable_page_ctor() then a coredump of the vector page will
- + * fail.
- + */
- +static int __init vectors_user_mapping_init_page(void)
- +{
- + struct page *page;
- + unsigned long addr = 0xffff0000;
- + pgd_t *pgd;
- + pud_t *pud;
- + pmd_t *pmd;
- +
- + pgd = pgd_offset_k(addr);
- + pud = pud_offset(pgd, addr);
- + pmd = pmd_offset(pud, addr);
- + page = pmd_page(*(pmd));
- +
- + pgtable_page_ctor(page);
- +
- + return 0;
- +}
- +late_initcall(vectors_user_mapping_init_page);
- +
- #ifdef CONFIG_KUSER_HELPERS
- /*
- * The vectors page is always readable from user space for the
- diff -Nur linux-4.1.39.orig/arch/arm/kernel/signal.c linux-4.1.39/arch/arm/kernel/signal.c
- --- linux-4.1.39.orig/arch/arm/kernel/signal.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/arm/kernel/signal.c 2017-04-18 17:56:30.549394649 +0200
- @@ -568,7 +568,8 @@
- do_work_pending(struct pt_regs *regs, unsigned int thread_flags, int syscall)
- {
- do {
- - if (likely(thread_flags & _TIF_NEED_RESCHED)) {
- + if (likely(thread_flags & (_TIF_NEED_RESCHED |
- + _TIF_NEED_RESCHED_LAZY))) {
- schedule();
- } else {
- if (unlikely(!user_mode(regs)))
- diff -Nur linux-4.1.39.orig/arch/arm/kernel/smp.c linux-4.1.39/arch/arm/kernel/smp.c
- --- linux-4.1.39.orig/arch/arm/kernel/smp.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/arm/kernel/smp.c 2017-04-18 17:56:30.549394649 +0200
- @@ -213,8 +213,6 @@
- flush_cache_louis();
- local_flush_tlb_all();
-
- - clear_tasks_mm_cpumask(cpu);
- -
- return 0;
- }
-
- @@ -230,6 +228,9 @@
- pr_err("CPU%u: cpu didn't die\n", cpu);
- return;
- }
- +
- + clear_tasks_mm_cpumask(cpu);
- +
- pr_notice("CPU%u: shutdown\n", cpu);
-
- /*
- diff -Nur linux-4.1.39.orig/arch/arm/kernel/unwind.c linux-4.1.39/arch/arm/kernel/unwind.c
- --- linux-4.1.39.orig/arch/arm/kernel/unwind.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/arm/kernel/unwind.c 2017-04-18 17:56:30.549394649 +0200
- @@ -93,7 +93,7 @@
- static const struct unwind_idx *__origin_unwind_idx;
- extern const struct unwind_idx __stop_unwind_idx[];
-
- -static DEFINE_SPINLOCK(unwind_lock);
- +static DEFINE_RAW_SPINLOCK(unwind_lock);
- static LIST_HEAD(unwind_tables);
-
- /* Convert a prel31 symbol to an absolute address */
- @@ -201,7 +201,7 @@
- /* module unwind tables */
- struct unwind_table *table;
-
- - spin_lock_irqsave(&unwind_lock, flags);
- + raw_spin_lock_irqsave(&unwind_lock, flags);
- list_for_each_entry(table, &unwind_tables, list) {
- if (addr >= table->begin_addr &&
- addr < table->end_addr) {
- @@ -213,7 +213,7 @@
- break;
- }
- }
- - spin_unlock_irqrestore(&unwind_lock, flags);
- + raw_spin_unlock_irqrestore(&unwind_lock, flags);
- }
-
- pr_debug("%s: idx = %p\n", __func__, idx);
- @@ -529,9 +529,9 @@
- tab->begin_addr = text_addr;
- tab->end_addr = text_addr + text_size;
-
- - spin_lock_irqsave(&unwind_lock, flags);
- + raw_spin_lock_irqsave(&unwind_lock, flags);
- list_add_tail(&tab->list, &unwind_tables);
- - spin_unlock_irqrestore(&unwind_lock, flags);
- + raw_spin_unlock_irqrestore(&unwind_lock, flags);
-
- return tab;
- }
- @@ -543,9 +543,9 @@
- if (!tab)
- return;
-
- - spin_lock_irqsave(&unwind_lock, flags);
- + raw_spin_lock_irqsave(&unwind_lock, flags);
- list_del(&tab->list);
- - spin_unlock_irqrestore(&unwind_lock, flags);
- + raw_spin_unlock_irqrestore(&unwind_lock, flags);
-
- kfree(tab);
- }
- diff -Nur linux-4.1.39.orig/arch/arm/kvm/arm.c linux-4.1.39/arch/arm/kvm/arm.c
- --- linux-4.1.39.orig/arch/arm/kvm/arm.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/arm/kvm/arm.c 2017-04-18 17:56:30.549394649 +0200
- @@ -473,9 +473,9 @@
-
- static void vcpu_pause(struct kvm_vcpu *vcpu)
- {
- - wait_queue_head_t *wq = kvm_arch_vcpu_wq(vcpu);
- + struct swait_head *wq = kvm_arch_vcpu_wq(vcpu);
-
- - wait_event_interruptible(*wq, !vcpu->arch.pause);
- + swait_event_interruptible(*wq, !vcpu->arch.pause);
- }
-
- static int kvm_vcpu_initialized(struct kvm_vcpu *vcpu)
- diff -Nur linux-4.1.39.orig/arch/arm/kvm/psci.c linux-4.1.39/arch/arm/kvm/psci.c
- --- linux-4.1.39.orig/arch/arm/kvm/psci.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/arm/kvm/psci.c 2017-04-18 17:56:30.549394649 +0200
- @@ -68,7 +68,7 @@
- {
- struct kvm *kvm = source_vcpu->kvm;
- struct kvm_vcpu *vcpu = NULL;
- - wait_queue_head_t *wq;
- + struct swait_head *wq;
- unsigned long cpu_id;
- unsigned long context_id;
- phys_addr_t target_pc;
- @@ -117,7 +117,7 @@
- smp_mb(); /* Make sure the above is visible */
-
- wq = kvm_arch_vcpu_wq(vcpu);
- - wake_up_interruptible(wq);
- + swait_wake_interruptible(wq);
-
- return PSCI_RET_SUCCESS;
- }
- diff -Nur linux-4.1.39.orig/arch/arm/mach-at91/at91rm9200.c linux-4.1.39/arch/arm/mach-at91/at91rm9200.c
- --- linux-4.1.39.orig/arch/arm/mach-at91/at91rm9200.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/arm/mach-at91/at91rm9200.c 2017-04-18 17:56:30.549394649 +0200
- @@ -13,7 +13,6 @@
- #include <linux/of_platform.h>
-
- #include <asm/mach/arch.h>
- -#include <asm/system_misc.h>
-
- #include "generic.h"
- #include "soc.h"
- @@ -34,7 +33,6 @@
-
- of_platform_populate(NULL, of_default_bus_match_table, NULL, soc_dev);
-
- - arm_pm_idle = at91rm9200_idle;
- at91rm9200_pm_init();
- }
-
- diff -Nur linux-4.1.39.orig/arch/arm/mach-at91/at91sam9.c linux-4.1.39/arch/arm/mach-at91/at91sam9.c
- --- linux-4.1.39.orig/arch/arm/mach-at91/at91sam9.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/arm/mach-at91/at91sam9.c 2017-04-18 17:56:30.549394649 +0200
- @@ -62,8 +62,6 @@
- soc_dev = soc_device_to_device(soc);
-
- of_platform_populate(NULL, of_default_bus_match_table, NULL, soc_dev);
- -
- - arm_pm_idle = at91sam9_idle;
- }
-
- static void __init at91sam9_dt_device_init(void)
- diff -Nur linux-4.1.39.orig/arch/arm/mach-at91/generic.h linux-4.1.39/arch/arm/mach-at91/generic.h
- --- linux-4.1.39.orig/arch/arm/mach-at91/generic.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/arm/mach-at91/generic.h 2017-04-18 17:56:30.549394649 +0200
- @@ -11,27 +11,18 @@
- #ifndef _AT91_GENERIC_H
- #define _AT91_GENERIC_H
-
- -#include <linux/of.h>
- -#include <linux/reboot.h>
- -
- - /* Map io */
- -extern void __init at91_map_io(void);
- -extern void __init at91_alt_map_io(void);
- -
- -/* idle */
- -extern void at91rm9200_idle(void);
- -extern void at91sam9_idle(void);
- -
- #ifdef CONFIG_PM
- extern void __init at91rm9200_pm_init(void);
- extern void __init at91sam9260_pm_init(void);
- extern void __init at91sam9g45_pm_init(void);
- extern void __init at91sam9x5_pm_init(void);
- +extern void __init sama5_pm_init(void);
- #else
- static inline void __init at91rm9200_pm_init(void) { }
- static inline void __init at91sam9260_pm_init(void) { }
- static inline void __init at91sam9g45_pm_init(void) { }
- static inline void __init at91sam9x5_pm_init(void) { }
- +static inline void __init sama5_pm_init(void) { }
- #endif
-
- #endif /* _AT91_GENERIC_H */
- diff -Nur linux-4.1.39.orig/arch/arm/mach-at91/pm.c linux-4.1.39/arch/arm/mach-at91/pm.c
- --- linux-4.1.39.orig/arch/arm/mach-at91/pm.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/arm/mach-at91/pm.c 2017-04-18 17:56:30.549394649 +0200
- @@ -31,10 +31,13 @@
- #include <asm/mach/irq.h>
- #include <asm/fncpy.h>
- #include <asm/cacheflush.h>
- +#include <asm/system_misc.h>
-
- #include "generic.h"
- #include "pm.h"
-
- +static void __iomem *pmc;
- +
- /*
- * FIXME: this is needed to communicate between the pinctrl driver and
- * the PM implementation in the machine. Possibly part of the PM
- @@ -85,7 +88,7 @@
- unsigned long scsr;
- int i;
-
- - scsr = at91_pmc_read(AT91_PMC_SCSR);
- + scsr = readl(pmc + AT91_PMC_SCSR);
-
- /* USB must not be using PLLB */
- if ((scsr & at91_pm_data.uhp_udp_mask) != 0) {
- @@ -99,8 +102,7 @@
-
- if ((scsr & (AT91_PMC_PCK0 << i)) == 0)
- continue;
- -
- - css = at91_pmc_read(AT91_PMC_PCKR(i)) & AT91_PMC_CSS;
- + css = readl(pmc + AT91_PMC_PCKR(i)) & AT91_PMC_CSS;
- if (css != AT91_PMC_CSS_SLOW) {
- pr_err("AT91: PM - Suspend-to-RAM with PCK%d src %d\n", i, css);
- return 0;
- @@ -143,8 +145,8 @@
- flush_cache_all();
- outer_disable();
-
- - at91_suspend_sram_fn(at91_pmc_base, at91_ramc_base[0],
- - at91_ramc_base[1], pm_data);
- + at91_suspend_sram_fn(pmc, at91_ramc_base[0],
- + at91_ramc_base[1], pm_data);
-
- outer_resume();
- }
- @@ -348,6 +350,21 @@
- at91_pm_set_standby(standby);
- }
-
- +void at91rm9200_idle(void)
- +{
- + /*
- + * Disable the processor clock. The processor will be automatically
- + * re-enabled by an interrupt or by a reset.
- + */
- + writel(AT91_PMC_PCK, pmc + AT91_PMC_SCDR);
- +}
- +
- +void at91sam9_idle(void)
- +{
- + writel(AT91_PMC_PCK, pmc + AT91_PMC_SCDR);
- + cpu_do_idle();
- +}
- +
- static void __init at91_pm_sram_init(void)
- {
- struct gen_pool *sram_pool;
- @@ -394,13 +411,36 @@
- &at91_pm_suspend_in_sram, at91_pm_suspend_in_sram_sz);
- }
-
- -static void __init at91_pm_init(void)
- +static const struct of_device_id atmel_pmc_ids[] __initconst = {
- + { .compatible = "atmel,at91rm9200-pmc" },
- + { .compatible = "atmel,at91sam9260-pmc" },
- + { .compatible = "atmel,at91sam9g45-pmc" },
- + { .compatible = "atmel,at91sam9n12-pmc" },
- + { .compatible = "atmel,at91sam9x5-pmc" },
- + { .compatible = "atmel,sama5d3-pmc" },
- + { .compatible = "atmel,sama5d2-pmc" },
- + { /* sentinel */ },
- +};
- +
- +static void __init at91_pm_init(void (*pm_idle)(void))
- {
- - at91_pm_sram_init();
- + struct device_node *pmc_np;
-
- if (at91_cpuidle_device.dev.platform_data)
- platform_device_register(&at91_cpuidle_device);
-
- + pmc_np = of_find_matching_node(NULL, atmel_pmc_ids);
- + pmc = of_iomap(pmc_np, 0);
- + if (!pmc) {
- + pr_err("AT91: PM not supported, PMC not found\n");
- + return;
- + }
- +
- + if (pm_idle)
- + arm_pm_idle = pm_idle;
- +
- + at91_pm_sram_init();
- +
- if (at91_suspend_sram_fn)
- suspend_set_ops(&at91_pm_ops);
- else
- @@ -419,7 +459,7 @@
- at91_pm_data.uhp_udp_mask = AT91RM9200_PMC_UHP | AT91RM9200_PMC_UDP;
- at91_pm_data.memctrl = AT91_MEMCTRL_MC;
-
- - at91_pm_init();
- + at91_pm_init(at91rm9200_idle);
- }
-
- void __init at91sam9260_pm_init(void)
- @@ -427,7 +467,7 @@
- at91_dt_ramc();
- at91_pm_data.memctrl = AT91_MEMCTRL_SDRAMC;
- at91_pm_data.uhp_udp_mask = AT91SAM926x_PMC_UHP | AT91SAM926x_PMC_UDP;
- - return at91_pm_init();
- + at91_pm_init(at91sam9_idle);
- }
-
- void __init at91sam9g45_pm_init(void)
- @@ -435,7 +475,7 @@
- at91_dt_ramc();
- at91_pm_data.uhp_udp_mask = AT91SAM926x_PMC_UHP;
- at91_pm_data.memctrl = AT91_MEMCTRL_DDRSDR;
- - return at91_pm_init();
- + at91_pm_init(at91sam9_idle);
- }
-
- void __init at91sam9x5_pm_init(void)
- @@ -443,5 +483,13 @@
- at91_dt_ramc();
- at91_pm_data.uhp_udp_mask = AT91SAM926x_PMC_UHP | AT91SAM926x_PMC_UDP;
- at91_pm_data.memctrl = AT91_MEMCTRL_DDRSDR;
- - return at91_pm_init();
- + at91_pm_init(at91sam9_idle);
- +}
- +
- +void __init sama5_pm_init(void)
- +{
- + at91_dt_ramc();
- + at91_pm_data.uhp_udp_mask = AT91SAM926x_PMC_UHP | AT91SAM926x_PMC_UDP;
- + at91_pm_data.memctrl = AT91_MEMCTRL_DDRSDR;
- + at91_pm_init(NULL);
- }
- diff -Nur linux-4.1.39.orig/arch/arm/mach-at91/sama5.c linux-4.1.39/arch/arm/mach-at91/sama5.c
- --- linux-4.1.39.orig/arch/arm/mach-at91/sama5.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/arm/mach-at91/sama5.c 2017-04-18 17:56:30.549394649 +0200
- @@ -49,7 +49,7 @@
- soc_dev = soc_device_to_device(soc);
-
- of_platform_populate(NULL, of_default_bus_match_table, NULL, soc_dev);
- - at91sam9x5_pm_init();
- + sama5_pm_init();
- }
-
- static const char *sama5_dt_board_compat[] __initconst = {
- diff -Nur linux-4.1.39.orig/arch/arm/mach-exynos/platsmp.c linux-4.1.39/arch/arm/mach-exynos/platsmp.c
- --- linux-4.1.39.orig/arch/arm/mach-exynos/platsmp.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/arm/mach-exynos/platsmp.c 2017-04-18 17:56:30.549394649 +0200
- @@ -231,7 +231,7 @@
- return (void __iomem *)(S5P_VA_SCU);
- }
-
- -static DEFINE_SPINLOCK(boot_lock);
- +static DEFINE_RAW_SPINLOCK(boot_lock);
-
- static void exynos_secondary_init(unsigned int cpu)
- {
- @@ -244,8 +244,8 @@
- /*
- * Synchronise with the boot thread.
- */
- - spin_lock(&boot_lock);
- - spin_unlock(&boot_lock);
- + raw_spin_lock(&boot_lock);
- + raw_spin_unlock(&boot_lock);
- }
-
- static int exynos_boot_secondary(unsigned int cpu, struct task_struct *idle)
- @@ -259,7 +259,7 @@
- * Set synchronisation state between this boot processor
- * and the secondary one
- */
- - spin_lock(&boot_lock);
- + raw_spin_lock(&boot_lock);
-
- /*
- * The secondary processor is waiting to be released from
- @@ -286,7 +286,7 @@
-
- if (timeout == 0) {
- printk(KERN_ERR "cpu1 power enable failed");
- - spin_unlock(&boot_lock);
- + raw_spin_unlock(&boot_lock);
- return -ETIMEDOUT;
- }
- }
- @@ -342,7 +342,7 @@
- * calibrations, then wait for it to finish
- */
- fail:
- - spin_unlock(&boot_lock);
- + raw_spin_unlock(&boot_lock);
-
- return pen_release != -1 ? ret : 0;
- }
- diff -Nur linux-4.1.39.orig/arch/arm/mach-hisi/platmcpm.c linux-4.1.39/arch/arm/mach-hisi/platmcpm.c
- --- linux-4.1.39.orig/arch/arm/mach-hisi/platmcpm.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/arm/mach-hisi/platmcpm.c 2017-04-18 17:56:30.549394649 +0200
- @@ -57,7 +57,7 @@
-
- static void __iomem *sysctrl, *fabric;
- static int hip04_cpu_table[HIP04_MAX_CLUSTERS][HIP04_MAX_CPUS_PER_CLUSTER];
- -static DEFINE_SPINLOCK(boot_lock);
- +static DEFINE_RAW_SPINLOCK(boot_lock);
- static u32 fabric_phys_addr;
- /*
- * [0]: bootwrapper physical address
- @@ -104,7 +104,7 @@
- if (cluster >= HIP04_MAX_CLUSTERS || cpu >= HIP04_MAX_CPUS_PER_CLUSTER)
- return -EINVAL;
-
- - spin_lock_irq(&boot_lock);
- + raw_spin_lock_irq(&boot_lock);
-
- if (hip04_cpu_table[cluster][cpu])
- goto out;
- @@ -133,7 +133,7 @@
- udelay(20);
- out:
- hip04_cpu_table[cluster][cpu]++;
- - spin_unlock_irq(&boot_lock);
- + raw_spin_unlock_irq(&boot_lock);
-
- return 0;
- }
- @@ -149,7 +149,7 @@
-
- __mcpm_cpu_going_down(cpu, cluster);
-
- - spin_lock(&boot_lock);
- + raw_spin_lock(&boot_lock);
- BUG_ON(__mcpm_cluster_state(cluster) != CLUSTER_UP);
- hip04_cpu_table[cluster][cpu]--;
- if (hip04_cpu_table[cluster][cpu] == 1) {
- @@ -162,7 +162,7 @@
-
- last_man = hip04_cluster_is_down(cluster);
- if (last_man && __mcpm_outbound_enter_critical(cpu, cluster)) {
- - spin_unlock(&boot_lock);
- + raw_spin_unlock(&boot_lock);
- /* Since it's Cortex A15, disable L2 prefetching. */
- asm volatile(
- "mcr p15, 1, %0, c15, c0, 3 \n\t"
- @@ -173,7 +173,7 @@
- hip04_set_snoop_filter(cluster, 0);
- __mcpm_outbound_leave_critical(cluster, CLUSTER_DOWN);
- } else {
- - spin_unlock(&boot_lock);
- + raw_spin_unlock(&boot_lock);
- v7_exit_coherency_flush(louis);
- }
-
- @@ -192,7 +192,7 @@
- cpu >= HIP04_MAX_CPUS_PER_CLUSTER);
-
- count = TIMEOUT_MSEC / POLL_MSEC;
- - spin_lock_irq(&boot_lock);
- + raw_spin_lock_irq(&boot_lock);
- for (tries = 0; tries < count; tries++) {
- if (hip04_cpu_table[cluster][cpu]) {
- ret = -EBUSY;
- @@ -202,10 +202,10 @@
- data = readl_relaxed(sysctrl + SC_CPU_RESET_STATUS(cluster));
- if (data & CORE_WFI_STATUS(cpu))
- break;
- - spin_unlock_irq(&boot_lock);
- + raw_spin_unlock_irq(&boot_lock);
- /* Wait for clean L2 when the whole cluster is down. */
- msleep(POLL_MSEC);
- - spin_lock_irq(&boot_lock);
- + raw_spin_lock_irq(&boot_lock);
- }
- if (tries >= count)
- goto err;
- @@ -220,10 +220,10 @@
- }
- if (tries >= count)
- goto err;
- - spin_unlock_irq(&boot_lock);
- + raw_spin_unlock_irq(&boot_lock);
- return 0;
- err:
- - spin_unlock_irq(&boot_lock);
- + raw_spin_unlock_irq(&boot_lock);
- return ret;
- }
-
- @@ -235,10 +235,10 @@
- cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
- cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
-
- - spin_lock(&boot_lock);
- + raw_spin_lock(&boot_lock);
- if (!hip04_cpu_table[cluster][cpu])
- hip04_cpu_table[cluster][cpu] = 1;
- - spin_unlock(&boot_lock);
- + raw_spin_unlock(&boot_lock);
- }
-
- static void __naked hip04_mcpm_power_up_setup(unsigned int affinity_level)
- diff -Nur linux-4.1.39.orig/arch/arm/mach-omap2/gpio.c linux-4.1.39/arch/arm/mach-omap2/gpio.c
- --- linux-4.1.39.orig/arch/arm/mach-omap2/gpio.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/arm/mach-omap2/gpio.c 2017-04-18 17:56:30.549394649 +0200
- @@ -130,7 +130,6 @@
- }
-
- pwrdm = omap_hwmod_get_pwrdm(oh);
- - pdata->loses_context = pwrdm_can_ever_lose_context(pwrdm);
-
- pdev = omap_device_build(name, id - 1, oh, pdata, sizeof(*pdata));
- kfree(pdata);
- diff -Nur linux-4.1.39.orig/arch/arm/mach-omap2/omap-smp.c linux-4.1.39/arch/arm/mach-omap2/omap-smp.c
- --- linux-4.1.39.orig/arch/arm/mach-omap2/omap-smp.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/arm/mach-omap2/omap-smp.c 2017-04-18 17:56:30.549394649 +0200
- @@ -43,7 +43,7 @@
- /* SCU base address */
- static void __iomem *scu_base;
-
- -static DEFINE_SPINLOCK(boot_lock);
- +static DEFINE_RAW_SPINLOCK(boot_lock);
-
- void __iomem *omap4_get_scu_base(void)
- {
- @@ -74,8 +74,8 @@
- /*
- * Synchronise with the boot thread.
- */
- - spin_lock(&boot_lock);
- - spin_unlock(&boot_lock);
- + raw_spin_lock(&boot_lock);
- + raw_spin_unlock(&boot_lock);
- }
-
- static int omap4_boot_secondary(unsigned int cpu, struct task_struct *idle)
- @@ -89,7 +89,7 @@
- * Set synchronisation state between this boot processor
- * and the secondary one
- */
- - spin_lock(&boot_lock);
- + raw_spin_lock(&boot_lock);
-
- /*
- * Update the AuxCoreBoot0 with boot state for secondary core.
- @@ -166,7 +166,7 @@
- * Now the secondary core is starting up let it run its
- * calibrations, then wait for it to finish
- */
- - spin_unlock(&boot_lock);
- + raw_spin_unlock(&boot_lock);
-
- return 0;
- }
- diff -Nur linux-4.1.39.orig/arch/arm/mach-omap2/powerdomain.c linux-4.1.39/arch/arm/mach-omap2/powerdomain.c
- --- linux-4.1.39.orig/arch/arm/mach-omap2/powerdomain.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/arm/mach-omap2/powerdomain.c 2017-04-18 17:56:30.553394804 +0200
- @@ -1166,43 +1166,3 @@
- return count;
- }
-
- -/**
- - * pwrdm_can_ever_lose_context - can this powerdomain ever lose context?
- - * @pwrdm: struct powerdomain *
- - *
- - * Given a struct powerdomain * @pwrdm, returns 1 if the powerdomain
- - * can lose either memory or logic context or if @pwrdm is invalid, or
- - * returns 0 otherwise. This function is not concerned with how the
- - * powerdomain registers are programmed (i.e., to go off or not); it's
- - * concerned with whether it's ever possible for this powerdomain to
- - * go off while some other part of the chip is active. This function
- - * assumes that every powerdomain can go to either ON or INACTIVE.
- - */
- -bool pwrdm_can_ever_lose_context(struct powerdomain *pwrdm)
- -{
- - int i;
- -
- - if (!pwrdm) {
- - pr_debug("powerdomain: %s: invalid powerdomain pointer\n",
- - __func__);
- - return 1;
- - }
- -
- - if (pwrdm->pwrsts & PWRSTS_OFF)
- - return 1;
- -
- - if (pwrdm->pwrsts & PWRSTS_RET) {
- - if (pwrdm->pwrsts_logic_ret & PWRSTS_OFF)
- - return 1;
- -
- - for (i = 0; i < pwrdm->banks; i++)
- - if (pwrdm->pwrsts_mem_ret[i] & PWRSTS_OFF)
- - return 1;
- - }
- -
- - for (i = 0; i < pwrdm->banks; i++)
- - if (pwrdm->pwrsts_mem_on[i] & PWRSTS_OFF)
- - return 1;
- -
- - return 0;
- -}
- diff -Nur linux-4.1.39.orig/arch/arm/mach-omap2/powerdomain.h linux-4.1.39/arch/arm/mach-omap2/powerdomain.h
- --- linux-4.1.39.orig/arch/arm/mach-omap2/powerdomain.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/arm/mach-omap2/powerdomain.h 2017-04-18 17:56:30.553394804 +0200
- @@ -244,7 +244,6 @@
- int pwrdm_pre_transition(struct powerdomain *pwrdm);
- int pwrdm_post_transition(struct powerdomain *pwrdm);
- int pwrdm_get_context_loss_count(struct powerdomain *pwrdm);
- -bool pwrdm_can_ever_lose_context(struct powerdomain *pwrdm);
-
- extern int omap_set_pwrdm_state(struct powerdomain *pwrdm, u8 state);
-
- diff -Nur linux-4.1.39.orig/arch/arm/mach-prima2/platsmp.c linux-4.1.39/arch/arm/mach-prima2/platsmp.c
- --- linux-4.1.39.orig/arch/arm/mach-prima2/platsmp.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/arm/mach-prima2/platsmp.c 2017-04-18 17:56:30.553394804 +0200
- @@ -22,7 +22,7 @@
-
- static void __iomem *clk_base;
-
- -static DEFINE_SPINLOCK(boot_lock);
- +static DEFINE_RAW_SPINLOCK(boot_lock);
-
- static void sirfsoc_secondary_init(unsigned int cpu)
- {
- @@ -36,8 +36,8 @@
- /*
- * Synchronise with the boot thread.
- */
- - spin_lock(&boot_lock);
- - spin_unlock(&boot_lock);
- + raw_spin_lock(&boot_lock);
- + raw_spin_unlock(&boot_lock);
- }
-
- static const struct of_device_id clk_ids[] = {
- @@ -75,7 +75,7 @@
- /* make sure write buffer is drained */
- mb();
-
- - spin_lock(&boot_lock);
- + raw_spin_lock(&boot_lock);
-
- /*
- * The secondary processor is waiting to be released from
- @@ -107,7 +107,7 @@
- * now the secondary core is starting up let it run its
- * calibrations, then wait for it to finish
- */
- - spin_unlock(&boot_lock);
- + raw_spin_unlock(&boot_lock);
-
- return pen_release != -1 ? -ENOSYS : 0;
- }
- diff -Nur linux-4.1.39.orig/arch/arm/mach-qcom/platsmp.c linux-4.1.39/arch/arm/mach-qcom/platsmp.c
- --- linux-4.1.39.orig/arch/arm/mach-qcom/platsmp.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/arm/mach-qcom/platsmp.c 2017-04-18 17:56:30.553394804 +0200
- @@ -46,7 +46,7 @@
-
- extern void secondary_startup_arm(void);
-
- -static DEFINE_SPINLOCK(boot_lock);
- +static DEFINE_RAW_SPINLOCK(boot_lock);
-
- #ifdef CONFIG_HOTPLUG_CPU
- static void __ref qcom_cpu_die(unsigned int cpu)
- @@ -60,8 +60,8 @@
- /*
- * Synchronise with the boot thread.
- */
- - spin_lock(&boot_lock);
- - spin_unlock(&boot_lock);
- + raw_spin_lock(&boot_lock);
- + raw_spin_unlock(&boot_lock);
- }
-
- static int scss_release_secondary(unsigned int cpu)
- @@ -284,7 +284,7 @@
- * set synchronisation state between this boot processor
- * and the secondary one
- */
- - spin_lock(&boot_lock);
- + raw_spin_lock(&boot_lock);
-
- /*
- * Send the secondary CPU a soft interrupt, thereby causing
- @@ -297,7 +297,7 @@
- * now the secondary core is starting up let it run its
- * calibrations, then wait for it to finish
- */
- - spin_unlock(&boot_lock);
- + raw_spin_unlock(&boot_lock);
-
- return ret;
- }
- diff -Nur linux-4.1.39.orig/arch/arm/mach-spear/platsmp.c linux-4.1.39/arch/arm/mach-spear/platsmp.c
- --- linux-4.1.39.orig/arch/arm/mach-spear/platsmp.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/arm/mach-spear/platsmp.c 2017-04-18 17:56:30.553394804 +0200
- @@ -32,7 +32,7 @@
- sync_cache_w(&pen_release);
- }
-
- -static DEFINE_SPINLOCK(boot_lock);
- +static DEFINE_RAW_SPINLOCK(boot_lock);
-
- static void __iomem *scu_base = IOMEM(VA_SCU_BASE);
-
- @@ -47,8 +47,8 @@
- /*
- * Synchronise with the boot thread.
- */
- - spin_lock(&boot_lock);
- - spin_unlock(&boot_lock);
- + raw_spin_lock(&boot_lock);
- + raw_spin_unlock(&boot_lock);
- }
-
- static int spear13xx_boot_secondary(unsigned int cpu, struct task_struct *idle)
- @@ -59,7 +59,7 @@
- * set synchronisation state between this boot processor
- * and the secondary one
- */
- - spin_lock(&boot_lock);
- + raw_spin_lock(&boot_lock);
-
- /*
- * The secondary processor is waiting to be released from
- @@ -84,7 +84,7 @@
- * now the secondary core is starting up let it run its
- * calibrations, then wait for it to finish
- */
- - spin_unlock(&boot_lock);
- + raw_spin_unlock(&boot_lock);
-
- return pen_release != -1 ? -ENOSYS : 0;
- }
- diff -Nur linux-4.1.39.orig/arch/arm/mach-sti/platsmp.c linux-4.1.39/arch/arm/mach-sti/platsmp.c
- --- linux-4.1.39.orig/arch/arm/mach-sti/platsmp.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/arm/mach-sti/platsmp.c 2017-04-18 17:56:30.553394804 +0200
- @@ -34,7 +34,7 @@
- sync_cache_w(&pen_release);
- }
-
- -static DEFINE_SPINLOCK(boot_lock);
- +static DEFINE_RAW_SPINLOCK(boot_lock);
-
- static void sti_secondary_init(unsigned int cpu)
- {
- @@ -49,8 +49,8 @@
- /*
- * Synchronise with the boot thread.
- */
- - spin_lock(&boot_lock);
- - spin_unlock(&boot_lock);
- + raw_spin_lock(&boot_lock);
- + raw_spin_unlock(&boot_lock);
- }
-
- static int sti_boot_secondary(unsigned int cpu, struct task_struct *idle)
- @@ -61,7 +61,7 @@
- * set synchronisation state between this boot processor
- * and the secondary one
- */
- - spin_lock(&boot_lock);
- + raw_spin_lock(&boot_lock);
-
- /*
- * The secondary processor is waiting to be released from
- @@ -92,7 +92,7 @@
- * now the secondary core is starting up let it run its
- * calibrations, then wait for it to finish
- */
- - spin_unlock(&boot_lock);
- + raw_spin_unlock(&boot_lock);
-
- return pen_release != -1 ? -ENOSYS : 0;
- }
- diff -Nur linux-4.1.39.orig/arch/arm/mach-ux500/platsmp.c linux-4.1.39/arch/arm/mach-ux500/platsmp.c
- --- linux-4.1.39.orig/arch/arm/mach-ux500/platsmp.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/arm/mach-ux500/platsmp.c 2017-04-18 17:56:30.553394804 +0200
- @@ -51,7 +51,7 @@
- return NULL;
- }
-
- -static DEFINE_SPINLOCK(boot_lock);
- +static DEFINE_RAW_SPINLOCK(boot_lock);
-
- static void ux500_secondary_init(unsigned int cpu)
- {
- @@ -64,8 +64,8 @@
- /*
- * Synchronise with the boot thread.
- */
- - spin_lock(&boot_lock);
- - spin_unlock(&boot_lock);
- + raw_spin_lock(&boot_lock);
- + raw_spin_unlock(&boot_lock);
- }
-
- static int ux500_boot_secondary(unsigned int cpu, struct task_struct *idle)
- @@ -76,7 +76,7 @@
- * set synchronisation state between this boot processor
- * and the secondary one
- */
- - spin_lock(&boot_lock);
- + raw_spin_lock(&boot_lock);
-
- /*
- * The secondary processor is waiting to be released from
- @@ -97,7 +97,7 @@
- * now the secondary core is starting up let it run its
- * calibrations, then wait for it to finish
- */
- - spin_unlock(&boot_lock);
- + raw_spin_unlock(&boot_lock);
-
- return pen_release != -1 ? -ENOSYS : 0;
- }
- diff -Nur linux-4.1.39.orig/arch/arm/mm/fault.c linux-4.1.39/arch/arm/mm/fault.c
- --- linux-4.1.39.orig/arch/arm/mm/fault.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/arm/mm/fault.c 2017-04-18 17:56:30.553394804 +0200
- @@ -276,7 +276,7 @@
- * If we're in an interrupt or have no user
- * context, we must not take the fault..
- */
- - if (in_atomic() || !mm)
- + if (faulthandler_disabled() || !mm)
- goto no_context;
-
- if (user_mode(regs))
- @@ -430,6 +430,9 @@
- if (addr < TASK_SIZE)
- return do_page_fault(addr, fsr, regs);
-
- + if (interrupts_enabled(regs))
- + local_irq_enable();
- +
- if (user_mode(regs))
- goto bad_area;
-
- @@ -497,6 +500,9 @@
- static int
- do_sect_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
- {
- + if (interrupts_enabled(regs))
- + local_irq_enable();
- +
- do_bad_area(addr, fsr, regs);
- return 0;
- }
- diff -Nur linux-4.1.39.orig/arch/arm/mm/highmem.c linux-4.1.39/arch/arm/mm/highmem.c
- --- linux-4.1.39.orig/arch/arm/mm/highmem.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/arm/mm/highmem.c 2017-04-18 17:56:30.553394804 +0200
- @@ -54,11 +54,13 @@
-
- void *kmap_atomic(struct page *page)
- {
- + pte_t pte = mk_pte(page, kmap_prot);
- unsigned int idx;
- unsigned long vaddr;
- void *kmap;
- int type;
-
- + preempt_disable_nort();
- pagefault_disable();
- if (!PageHighMem(page))
- return page_address(page);
- @@ -92,7 +94,10 @@
- * in place, so the contained TLB flush ensures the TLB is updated
- * with the new mapping.
- */
- - set_fixmap_pte(idx, mk_pte(page, kmap_prot));
- +#ifdef CONFIG_PREEMPT_RT_FULL
- + current->kmap_pte[type] = pte;
- +#endif
- + set_fixmap_pte(idx, pte);
-
- return (void *)vaddr;
- }
- @@ -109,27 +114,33 @@
-
- if (cache_is_vivt())
- __cpuc_flush_dcache_area((void *)vaddr, PAGE_SIZE);
- +#ifdef CONFIG_PREEMPT_RT_FULL
- + current->kmap_pte[type] = __pte(0);
- +#endif
- #ifdef CONFIG_DEBUG_HIGHMEM
- BUG_ON(vaddr != __fix_to_virt(idx));
- - set_fixmap_pte(idx, __pte(0));
- #else
- (void) idx; /* to kill a warning */
- #endif
- + set_fixmap_pte(idx, __pte(0));
- kmap_atomic_idx_pop();
- } else if (vaddr >= PKMAP_ADDR(0) && vaddr < PKMAP_ADDR(LAST_PKMAP)) {
- /* this address was obtained through kmap_high_get() */
- kunmap_high(pte_page(pkmap_page_table[PKMAP_NR(vaddr)]));
- }
- pagefault_enable();
- + preempt_enable_nort();
- }
- EXPORT_SYMBOL(__kunmap_atomic);
-
- void *kmap_atomic_pfn(unsigned long pfn)
- {
- + pte_t pte = pfn_pte(pfn, kmap_prot);
- unsigned long vaddr;
- int idx, type;
- struct page *page = pfn_to_page(pfn);
-
- + preempt_disable_nort();
- pagefault_disable();
- if (!PageHighMem(page))
- return page_address(page);
- @@ -140,7 +151,10 @@
- #ifdef CONFIG_DEBUG_HIGHMEM
- BUG_ON(!pte_none(get_fixmap_pte(vaddr)));
- #endif
- - set_fixmap_pte(idx, pfn_pte(pfn, kmap_prot));
- +#ifdef CONFIG_PREEMPT_RT_FULL
- + current->kmap_pte[type] = pte;
- +#endif
- + set_fixmap_pte(idx, pte);
-
- return (void *)vaddr;
- }
- @@ -154,3 +168,28 @@
-
- return pte_page(get_fixmap_pte(vaddr));
- }
- +
- +#if defined CONFIG_PREEMPT_RT_FULL
- +void switch_kmaps(struct task_struct *prev_p, struct task_struct *next_p)
- +{
- + int i;
- +
- + /*
- + * Clear @prev's kmap_atomic mappings
- + */
- + for (i = 0; i < prev_p->kmap_idx; i++) {
- + int idx = i + KM_TYPE_NR * smp_processor_id();
- +
- + set_fixmap_pte(idx, __pte(0));
- + }
- + /*
- + * Restore @next_p's kmap_atomic mappings
- + */
- + for (i = 0; i < next_p->kmap_idx; i++) {
- + int idx = i + KM_TYPE_NR * smp_processor_id();
- +
- + if (!pte_none(next_p->kmap_pte[i]))
- + set_fixmap_pte(idx, next_p->kmap_pte[i]);
- + }
- +}
- +#endif
- diff -Nur linux-4.1.39.orig/arch/arm/plat-versatile/platsmp.c linux-4.1.39/arch/arm/plat-versatile/platsmp.c
- --- linux-4.1.39.orig/arch/arm/plat-versatile/platsmp.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/arm/plat-versatile/platsmp.c 2017-04-18 17:56:30.553394804 +0200
- @@ -30,7 +30,7 @@
- sync_cache_w(&pen_release);
- }
-
- -static DEFINE_SPINLOCK(boot_lock);
- +static DEFINE_RAW_SPINLOCK(boot_lock);
-
- void versatile_secondary_init(unsigned int cpu)
- {
- @@ -43,8 +43,8 @@
- /*
- * Synchronise with the boot thread.
- */
- - spin_lock(&boot_lock);
- - spin_unlock(&boot_lock);
- + raw_spin_lock(&boot_lock);
- + raw_spin_unlock(&boot_lock);
- }
-
- int versatile_boot_secondary(unsigned int cpu, struct task_struct *idle)
- @@ -55,7 +55,7 @@
- * Set synchronisation state between this boot processor
- * and the secondary one
- */
- - spin_lock(&boot_lock);
- + raw_spin_lock(&boot_lock);
-
- /*
- * This is really belt and braces; we hold unintended secondary
- @@ -85,7 +85,7 @@
- * now the secondary core is starting up let it run its
- * calibrations, then wait for it to finish
- */
- - spin_unlock(&boot_lock);
- + raw_spin_unlock(&boot_lock);
-
- return pen_release != -1 ? -ENOSYS : 0;
- }
- diff -Nur linux-4.1.39.orig/arch/arm64/include/asm/futex.h linux-4.1.39/arch/arm64/include/asm/futex.h
- --- linux-4.1.39.orig/arch/arm64/include/asm/futex.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/arm64/include/asm/futex.h 2017-04-18 17:56:30.553394804 +0200
- @@ -58,7 +58,7 @@
- if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
- return -EFAULT;
-
- - pagefault_disable(); /* implies preempt_disable() */
- + pagefault_disable();
-
- switch (op) {
- case FUTEX_OP_SET:
- @@ -85,7 +85,7 @@
- ret = -ENOSYS;
- }
-
- - pagefault_enable(); /* subsumes preempt_enable() */
- + pagefault_enable();
-
- if (!ret) {
- switch (cmp) {
- diff -Nur linux-4.1.39.orig/arch/arm64/include/asm/thread_info.h linux-4.1.39/arch/arm64/include/asm/thread_info.h
- --- linux-4.1.39.orig/arch/arm64/include/asm/thread_info.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/arm64/include/asm/thread_info.h 2017-04-18 17:56:30.553394804 +0200
- @@ -47,6 +47,7 @@
- mm_segment_t addr_limit; /* address limit */
- struct task_struct *task; /* main task structure */
- int preempt_count; /* 0 => preemptable, <0 => bug */
- + int preempt_lazy_count; /* 0 => preemptable, <0 => bug */
- int cpu; /* cpu */
- };
-
- @@ -101,6 +102,7 @@
- #define TIF_NEED_RESCHED 1
- #define TIF_NOTIFY_RESUME 2 /* callback before returning to user */
- #define TIF_FOREIGN_FPSTATE 3 /* CPU's FP state is not current's */
- +#define TIF_NEED_RESCHED_LAZY 4
- #define TIF_NOHZ 7
- #define TIF_SYSCALL_TRACE 8
- #define TIF_SYSCALL_AUDIT 9
- @@ -117,6 +119,7 @@
- #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
- #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
- #define _TIF_FOREIGN_FPSTATE (1 << TIF_FOREIGN_FPSTATE)
- +#define _TIF_NEED_RESCHED_LAZY (1 << TIF_NEED_RESCHED_LAZY)
- #define _TIF_NOHZ (1 << TIF_NOHZ)
- #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
- #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
- diff -Nur linux-4.1.39.orig/arch/arm64/Kconfig linux-4.1.39/arch/arm64/Kconfig
- --- linux-4.1.39.orig/arch/arm64/Kconfig 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/arm64/Kconfig 2017-04-18 17:56:30.553394804 +0200
- @@ -69,8 +69,10 @@
- select HAVE_PERF_REGS
- select HAVE_PERF_USER_STACK_DUMP
- select HAVE_RCU_TABLE_FREE
- + select HAVE_PREEMPT_LAZY
- select HAVE_SYSCALL_TRACEPOINTS
- select IRQ_DOMAIN
- + select IRQ_FORCED_THREADING
- select MODULES_USE_ELF_RELA
- select NO_BOOTMEM
- select OF
- @@ -599,7 +601,7 @@
-
- config XEN
- bool "Xen guest support on ARM64"
- - depends on ARM64 && OF
- + depends on ARM64 && OF && !PREEMPT_RT_FULL
- select SWIOTLB_XEN
- help
- Say Y if you want to run Linux in a Virtual Machine on Xen on ARM64.
- diff -Nur linux-4.1.39.orig/arch/arm64/kernel/asm-offsets.c linux-4.1.39/arch/arm64/kernel/asm-offsets.c
- --- linux-4.1.39.orig/arch/arm64/kernel/asm-offsets.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/arm64/kernel/asm-offsets.c 2017-04-18 17:56:30.553394804 +0200
- @@ -35,6 +35,7 @@
- BLANK();
- DEFINE(TI_FLAGS, offsetof(struct thread_info, flags));
- DEFINE(TI_PREEMPT, offsetof(struct thread_info, preempt_count));
- + DEFINE(TI_PREEMPT_LAZY, offsetof(struct thread_info, preempt_lazy_count));
- DEFINE(TI_ADDR_LIMIT, offsetof(struct thread_info, addr_limit));
- DEFINE(TI_TASK, offsetof(struct thread_info, task));
- DEFINE(TI_CPU, offsetof(struct thread_info, cpu));
- diff -Nur linux-4.1.39.orig/arch/arm64/kernel/entry.S linux-4.1.39/arch/arm64/kernel/entry.S
- --- linux-4.1.39.orig/arch/arm64/kernel/entry.S 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/arm64/kernel/entry.S 2017-04-18 17:56:30.553394804 +0200
- @@ -380,11 +380,16 @@
- #ifdef CONFIG_PREEMPT
- get_thread_info tsk
- ldr w24, [tsk, #TI_PREEMPT] // get preempt count
- - cbnz w24, 1f // preempt count != 0
- + cbnz w24, 2f // preempt count != 0
- ldr x0, [tsk, #TI_FLAGS] // get flags
- - tbz x0, #TIF_NEED_RESCHED, 1f // needs rescheduling?
- - bl el1_preempt
- + tbnz x0, #TIF_NEED_RESCHED, 1f // needs rescheduling?
- +
- + ldr w24, [tsk, #TI_PREEMPT_LAZY] // get preempt lazy count
- + cbnz w24, 2f // preempt lazy count != 0
- + tbz x0, #TIF_NEED_RESCHED_LAZY, 2f // needs rescheduling?
- 1:
- + bl el1_preempt
- +2:
- #endif
- #ifdef CONFIG_TRACE_IRQFLAGS
- bl trace_hardirqs_on
- @@ -398,6 +403,7 @@
- 1: bl preempt_schedule_irq // irq en/disable is done inside
- ldr x0, [tsk, #TI_FLAGS] // get new tasks TI_FLAGS
- tbnz x0, #TIF_NEED_RESCHED, 1b // needs rescheduling?
- + tbnz x0, #TIF_NEED_RESCHED_LAZY, 1b // needs rescheduling?
- ret x24
- #endif
-
- @@ -635,6 +641,7 @@
- str x0, [sp, #S_X0] // returned x0
- work_pending:
- tbnz x1, #TIF_NEED_RESCHED, work_resched
- + tbnz x1, #TIF_NEED_RESCHED_LAZY, work_resched
- /* TIF_SIGPENDING, TIF_NOTIFY_RESUME or TIF_FOREIGN_FPSTATE case */
- ldr x2, [sp, #S_PSTATE]
- mov x0, sp // 'regs'
- diff -Nur linux-4.1.39.orig/arch/arm64/kernel/insn.c linux-4.1.39/arch/arm64/kernel/insn.c
- --- linux-4.1.39.orig/arch/arm64/kernel/insn.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/arm64/kernel/insn.c 2017-04-18 17:56:30.553394804 +0200
- @@ -77,7 +77,7 @@
- }
- }
-
- -static DEFINE_SPINLOCK(patch_lock);
- +static DEFINE_RAW_SPINLOCK(patch_lock);
-
- static void __kprobes *patch_map(void *addr, int fixmap)
- {
- @@ -124,13 +124,13 @@
- unsigned long flags = 0;
- int ret;
-
- - spin_lock_irqsave(&patch_lock, flags);
- + raw_spin_lock_irqsave(&patch_lock, flags);
- waddr = patch_map(addr, FIX_TEXT_POKE0);
-
- ret = probe_kernel_write(waddr, &insn, AARCH64_INSN_SIZE);
-
- patch_unmap(FIX_TEXT_POKE0);
- - spin_unlock_irqrestore(&patch_lock, flags);
- + raw_spin_unlock_irqrestore(&patch_lock, flags);
-
- return ret;
- }
- diff -Nur linux-4.1.39.orig/arch/arm64/kernel/perf_event.c linux-4.1.39/arch/arm64/kernel/perf_event.c
- --- linux-4.1.39.orig/arch/arm64/kernel/perf_event.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/arm64/kernel/perf_event.c 2017-04-18 17:56:30.553394804 +0200
- @@ -488,7 +488,7 @@
- }
-
- err = request_irq(irq, armpmu->handle_irq,
- - IRQF_NOBALANCING,
- + IRQF_NOBALANCING | IRQF_NO_THREAD,
- "arm-pmu", armpmu);
- if (err) {
- pr_err("unable to request IRQ%d for ARM PMU counters\n",
- diff -Nur linux-4.1.39.orig/arch/arm64/mm/fault.c linux-4.1.39/arch/arm64/mm/fault.c
- --- linux-4.1.39.orig/arch/arm64/mm/fault.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/arm64/mm/fault.c 2017-04-18 17:56:30.553394804 +0200
- @@ -211,7 +211,7 @@
- * If we're in an interrupt or have no user context, we must not take
- * the fault.
- */
- - if (in_atomic() || !mm)
- + if (faulthandler_disabled() || !mm)
- goto no_context;
-
- if (user_mode(regs))
- diff -Nur linux-4.1.39.orig/arch/avr32/include/asm/uaccess.h linux-4.1.39/arch/avr32/include/asm/uaccess.h
- --- linux-4.1.39.orig/arch/avr32/include/asm/uaccess.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/avr32/include/asm/uaccess.h 2017-04-18 17:56:30.553394804 +0200
- @@ -106,7 +106,8 @@
- * @x: Value to copy to user space.
- * @ptr: Destination address, in user space.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * This macro copies a single simple value from kernel space to user
- * space. It supports simple types like char and int, but not larger
- @@ -125,7 +126,8 @@
- * @x: Variable to store result.
- * @ptr: Source address, in user space.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * This macro copies a single simple variable from user space to kernel
- * space. It supports simple types like char and int, but not larger
- @@ -145,7 +147,8 @@
- * @x: Value to copy to user space.
- * @ptr: Destination address, in user space.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * This macro copies a single simple value from kernel space to user
- * space. It supports simple types like char and int, but not larger
- @@ -167,7 +170,8 @@
- * @x: Variable to store result.
- * @ptr: Source address, in user space.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * This macro copies a single simple variable from user space to kernel
- * space. It supports simple types like char and int, but not larger
- diff -Nur linux-4.1.39.orig/arch/avr32/mm/fault.c linux-4.1.39/arch/avr32/mm/fault.c
- --- linux-4.1.39.orig/arch/avr32/mm/fault.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/avr32/mm/fault.c 2017-04-18 17:56:30.553394804 +0200
- @@ -14,11 +14,11 @@
- #include <linux/pagemap.h>
- #include <linux/kdebug.h>
- #include <linux/kprobes.h>
- +#include <linux/uaccess.h>
-
- #include <asm/mmu_context.h>
- #include <asm/sysreg.h>
- #include <asm/tlb.h>
- -#include <asm/uaccess.h>
-
- #ifdef CONFIG_KPROBES
- static inline int notify_page_fault(struct pt_regs *regs, int trap)
- @@ -81,7 +81,7 @@
- * If we're in an interrupt or have no user context, we must
- * not take the fault...
- */
- - if (in_atomic() || !mm || regs->sr & SYSREG_BIT(GM))
- + if (faulthandler_disabled() || !mm || regs->sr & SYSREG_BIT(GM))
- goto no_context;
-
- local_irq_enable();
- diff -Nur linux-4.1.39.orig/arch/cris/mm/fault.c linux-4.1.39/arch/cris/mm/fault.c
- --- linux-4.1.39.orig/arch/cris/mm/fault.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/cris/mm/fault.c 2017-04-18 17:56:30.553394804 +0200
- @@ -8,7 +8,7 @@
- #include <linux/interrupt.h>
- #include <linux/module.h>
- #include <linux/wait.h>
- -#include <asm/uaccess.h>
- +#include <linux/uaccess.h>
- #include <arch/system.h>
-
- extern int find_fixup_code(struct pt_regs *);
- @@ -109,11 +109,11 @@
- info.si_code = SEGV_MAPERR;
-
- /*
- - * If we're in an interrupt or "atomic" operation or have no
- + * If we're in an interrupt, have pagefaults disabled or have no
- * user context, we must not take the fault.
- */
-
- - if (in_atomic() || !mm)
- + if (faulthandler_disabled() || !mm)
- goto no_context;
-
- if (user_mode(regs))
- diff -Nur linux-4.1.39.orig/arch/frv/mm/fault.c linux-4.1.39/arch/frv/mm/fault.c
- --- linux-4.1.39.orig/arch/frv/mm/fault.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/frv/mm/fault.c 2017-04-18 17:56:30.553394804 +0200
- @@ -19,9 +19,9 @@
- #include <linux/kernel.h>
- #include <linux/ptrace.h>
- #include <linux/hardirq.h>
- +#include <linux/uaccess.h>
-
- #include <asm/pgtable.h>
- -#include <asm/uaccess.h>
- #include <asm/gdb-stub.h>
-
- /*****************************************************************************/
- @@ -78,7 +78,7 @@
- * If we're in an interrupt or have no user
- * context, we must not take the fault..
- */
- - if (in_atomic() || !mm)
- + if (faulthandler_disabled() || !mm)
- goto no_context;
-
- if (user_mode(__frame))
- diff -Nur linux-4.1.39.orig/arch/frv/mm/highmem.c linux-4.1.39/arch/frv/mm/highmem.c
- --- linux-4.1.39.orig/arch/frv/mm/highmem.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/frv/mm/highmem.c 2017-04-18 17:56:30.553394804 +0200
- @@ -42,6 +42,7 @@
- unsigned long paddr;
- int type;
-
- + preempt_disable();
- pagefault_disable();
- type = kmap_atomic_idx_push();
- paddr = page_to_phys(page);
- @@ -85,5 +86,6 @@
- }
- kmap_atomic_idx_pop();
- pagefault_enable();
- + preempt_enable();
- }
- EXPORT_SYMBOL(__kunmap_atomic);
- diff -Nur linux-4.1.39.orig/arch/hexagon/include/asm/uaccess.h linux-4.1.39/arch/hexagon/include/asm/uaccess.h
- --- linux-4.1.39.orig/arch/hexagon/include/asm/uaccess.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/hexagon/include/asm/uaccess.h 2017-04-18 17:56:30.553394804 +0200
- @@ -36,7 +36,8 @@
- * @addr: User space pointer to start of block to check
- * @size: Size of block to check
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * Checks if a pointer to a block of memory in user space is valid.
- *
- diff -Nur linux-4.1.39.orig/arch/ia64/mm/fault.c linux-4.1.39/arch/ia64/mm/fault.c
- --- linux-4.1.39.orig/arch/ia64/mm/fault.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/ia64/mm/fault.c 2017-04-18 17:56:30.553394804 +0200
- @@ -11,10 +11,10 @@
- #include <linux/kprobes.h>
- #include <linux/kdebug.h>
- #include <linux/prefetch.h>
- +#include <linux/uaccess.h>
-
- #include <asm/pgtable.h>
- #include <asm/processor.h>
- -#include <asm/uaccess.h>
-
- extern int die(char *, struct pt_regs *, long);
-
- @@ -96,7 +96,7 @@
- /*
- * If we're in an interrupt or have no user context, we must not take the fault..
- */
- - if (in_atomic() || !mm)
- + if (faulthandler_disabled() || !mm)
- goto no_context;
-
- #ifdef CONFIG_VIRTUAL_MEM_MAP
- diff -Nur linux-4.1.39.orig/arch/Kconfig linux-4.1.39/arch/Kconfig
- --- linux-4.1.39.orig/arch/Kconfig 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/Kconfig 2017-04-18 17:56:30.549394649 +0200
- @@ -6,6 +6,7 @@
- tristate "OProfile system profiling"
- depends on PROFILING
- depends on HAVE_OPROFILE
- + depends on !PREEMPT_RT_FULL
- select RING_BUFFER
- select RING_BUFFER_ALLOW_SWAP
- help
- @@ -49,6 +50,7 @@
- config JUMP_LABEL
- bool "Optimize very unlikely/likely branches"
- depends on HAVE_ARCH_JUMP_LABEL
- + depends on (!INTERRUPT_OFF_HIST && !PREEMPT_OFF_HIST && !WAKEUP_LATENCY_HIST && !MISSED_TIMER_OFFSETS_HIST)
- help
- This option enables a transparent branch optimization that
- makes certain almost-always-true or almost-always-false branch
- diff -Nur linux-4.1.39.orig/arch/m32r/include/asm/uaccess.h linux-4.1.39/arch/m32r/include/asm/uaccess.h
- --- linux-4.1.39.orig/arch/m32r/include/asm/uaccess.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/m32r/include/asm/uaccess.h 2017-04-18 17:56:30.553394804 +0200
- @@ -91,7 +91,8 @@
- * @addr: User space pointer to start of block to check
- * @size: Size of block to check
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * Checks if a pointer to a block of memory in user space is valid.
- *
- @@ -155,7 +156,8 @@
- * @x: Variable to store result.
- * @ptr: Source address, in user space.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * This macro copies a single simple variable from user space to kernel
- * space. It supports simple types like char and int, but not larger
- @@ -175,7 +177,8 @@
- * @x: Value to copy to user space.
- * @ptr: Destination address, in user space.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * This macro copies a single simple value from kernel space to user
- * space. It supports simple types like char and int, but not larger
- @@ -194,7 +197,8 @@
- * @x: Variable to store result.
- * @ptr: Source address, in user space.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * This macro copies a single simple variable from user space to kernel
- * space. It supports simple types like char and int, but not larger
- @@ -274,7 +278,8 @@
- * @x: Value to copy to user space.
- * @ptr: Destination address, in user space.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * This macro copies a single simple value from kernel space to user
- * space. It supports simple types like char and int, but not larger
- @@ -568,7 +573,8 @@
- * @from: Source address, in kernel space.
- * @n: Number of bytes to copy.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * Copy data from kernel space to user space. Caller must check
- * the specified block with access_ok() before calling this function.
- @@ -588,7 +594,8 @@
- * @from: Source address, in kernel space.
- * @n: Number of bytes to copy.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * Copy data from kernel space to user space.
- *
- @@ -606,7 +613,8 @@
- * @from: Source address, in user space.
- * @n: Number of bytes to copy.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * Copy data from user space to kernel space. Caller must check
- * the specified block with access_ok() before calling this function.
- @@ -626,7 +634,8 @@
- * @from: Source address, in user space.
- * @n: Number of bytes to copy.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * Copy data from user space to kernel space.
- *
- @@ -677,7 +686,8 @@
- * strlen_user: - Get the size of a string in user space.
- * @str: The string to measure.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * Get the size of a NUL-terminated string in user space.
- *
- diff -Nur linux-4.1.39.orig/arch/m32r/mm/fault.c linux-4.1.39/arch/m32r/mm/fault.c
- --- linux-4.1.39.orig/arch/m32r/mm/fault.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/m32r/mm/fault.c 2017-04-18 17:56:30.553394804 +0200
- @@ -24,9 +24,9 @@
- #include <linux/vt_kern.h> /* For unblank_screen() */
- #include <linux/highmem.h>
- #include <linux/module.h>
- +#include <linux/uaccess.h>
-
- #include <asm/m32r.h>
- -#include <asm/uaccess.h>
- #include <asm/hardirq.h>
- #include <asm/mmu_context.h>
- #include <asm/tlbflush.h>
- @@ -111,10 +111,10 @@
- mm = tsk->mm;
-
- /*
- - * If we're in an interrupt or have no user context or are running in an
- - * atomic region then we must not take the fault..
- + * If we're in an interrupt or have no user context or have pagefaults
- + * disabled then we must not take the fault.
- */
- - if (in_atomic() || !mm)
- + if (faulthandler_disabled() || !mm)
- goto bad_area_nosemaphore;
-
- if (error_code & ACE_USERMODE)
- diff -Nur linux-4.1.39.orig/arch/m68k/mm/fault.c linux-4.1.39/arch/m68k/mm/fault.c
- --- linux-4.1.39.orig/arch/m68k/mm/fault.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/m68k/mm/fault.c 2017-04-18 17:56:30.557394959 +0200
- @@ -10,10 +10,10 @@
- #include <linux/ptrace.h>
- #include <linux/interrupt.h>
- #include <linux/module.h>
- +#include <linux/uaccess.h>
-
- #include <asm/setup.h>
- #include <asm/traps.h>
- -#include <asm/uaccess.h>
- #include <asm/pgalloc.h>
-
- extern void die_if_kernel(char *, struct pt_regs *, long);
- @@ -81,7 +81,7 @@
- * If we're in an interrupt or have no user
- * context, we must not take the fault..
- */
- - if (in_atomic() || !mm)
- + if (faulthandler_disabled() || !mm)
- goto no_context;
-
- if (user_mode(regs))
- diff -Nur linux-4.1.39.orig/arch/metag/mm/fault.c linux-4.1.39/arch/metag/mm/fault.c
- --- linux-4.1.39.orig/arch/metag/mm/fault.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/metag/mm/fault.c 2017-04-18 17:56:30.557394959 +0200
- @@ -105,7 +105,7 @@
-
- mm = tsk->mm;
-
- - if (in_atomic() || !mm)
- + if (faulthandler_disabled() || !mm)
- goto no_context;
-
- if (user_mode(regs))
- diff -Nur linux-4.1.39.orig/arch/metag/mm/highmem.c linux-4.1.39/arch/metag/mm/highmem.c
- --- linux-4.1.39.orig/arch/metag/mm/highmem.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/metag/mm/highmem.c 2017-04-18 17:56:30.557394959 +0200
- @@ -43,7 +43,7 @@
- unsigned long vaddr;
- int type;
-
- - /* even !CONFIG_PREEMPT needs this, for in_atomic in do_page_fault */
- + preempt_disable();
- pagefault_disable();
- if (!PageHighMem(page))
- return page_address(page);
- @@ -82,6 +82,7 @@
- }
-
- pagefault_enable();
- + preempt_enable();
- }
- EXPORT_SYMBOL(__kunmap_atomic);
-
- @@ -95,6 +96,7 @@
- unsigned long vaddr;
- int type;
-
- + preempt_disable();
- pagefault_disable();
-
- type = kmap_atomic_idx_push();
- diff -Nur linux-4.1.39.orig/arch/microblaze/include/asm/uaccess.h linux-4.1.39/arch/microblaze/include/asm/uaccess.h
- --- linux-4.1.39.orig/arch/microblaze/include/asm/uaccess.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/microblaze/include/asm/uaccess.h 2017-04-18 17:56:30.557394959 +0200
- @@ -178,7 +178,8 @@
- * @x: Variable to store result.
- * @ptr: Source address, in user space.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * This macro copies a single simple variable from user space to kernel
- * space. It supports simple types like char and int, but not larger
- @@ -290,7 +291,8 @@
- * @x: Value to copy to user space.
- * @ptr: Destination address, in user space.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * This macro copies a single simple value from kernel space to user
- * space. It supports simple types like char and int, but not larger
- diff -Nur linux-4.1.39.orig/arch/microblaze/mm/fault.c linux-4.1.39/arch/microblaze/mm/fault.c
- --- linux-4.1.39.orig/arch/microblaze/mm/fault.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/microblaze/mm/fault.c 2017-04-18 17:56:30.557394959 +0200
- @@ -107,14 +107,14 @@
- if ((error_code & 0x13) == 0x13 || (error_code & 0x11) == 0x11)
- is_write = 0;
-
- - if (unlikely(in_atomic() || !mm)) {
- + if (unlikely(faulthandler_disabled() || !mm)) {
- if (kernel_mode(regs))
- goto bad_area_nosemaphore;
-
- - /* in_atomic() in user mode is really bad,
- + /* faulthandler_disabled() in user mode is really bad,
- as is current->mm == NULL. */
- - pr_emerg("Page fault in user mode with in_atomic(), mm = %p\n",
- - mm);
- + pr_emerg("Page fault in user mode with faulthandler_disabled(), mm = %p\n",
- + mm);
- pr_emerg("r15 = %lx MSR = %lx\n",
- regs->r15, regs->msr);
- die("Weird page fault", regs, SIGSEGV);
- diff -Nur linux-4.1.39.orig/arch/microblaze/mm/highmem.c linux-4.1.39/arch/microblaze/mm/highmem.c
- --- linux-4.1.39.orig/arch/microblaze/mm/highmem.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/microblaze/mm/highmem.c 2017-04-18 17:56:30.557394959 +0200
- @@ -37,7 +37,7 @@
- unsigned long vaddr;
- int idx, type;
-
- - /* even !CONFIG_PREEMPT needs this, for in_atomic in do_page_fault */
- + preempt_disable();
- pagefault_disable();
- if (!PageHighMem(page))
- return page_address(page);
- @@ -63,6 +63,7 @@
-
- if (vaddr < __fix_to_virt(FIX_KMAP_END)) {
- pagefault_enable();
- + preempt_enable();
- return;
- }
-
- @@ -84,5 +85,6 @@
- #endif
- kmap_atomic_idx_pop();
- pagefault_enable();
- + preempt_enable();
- }
- EXPORT_SYMBOL(__kunmap_atomic);
- diff -Nur linux-4.1.39.orig/arch/mips/include/asm/uaccess.h linux-4.1.39/arch/mips/include/asm/uaccess.h
- --- linux-4.1.39.orig/arch/mips/include/asm/uaccess.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/mips/include/asm/uaccess.h 2017-04-18 17:56:30.557394959 +0200
- @@ -104,7 +104,8 @@
- * @addr: User space pointer to start of block to check
- * @size: Size of block to check
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * Checks if a pointer to a block of memory in user space is valid.
- *
- @@ -139,7 +140,8 @@
- * @x: Value to copy to user space.
- * @ptr: Destination address, in user space.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * This macro copies a single simple value from kernel space to user
- * space. It supports simple types like char and int, but not larger
- @@ -158,7 +160,8 @@
- * @x: Variable to store result.
- * @ptr: Source address, in user space.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * This macro copies a single simple variable from user space to kernel
- * space. It supports simple types like char and int, but not larger
- @@ -178,7 +181,8 @@
- * @x: Value to copy to user space.
- * @ptr: Destination address, in user space.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * This macro copies a single simple value from kernel space to user
- * space. It supports simple types like char and int, but not larger
- @@ -200,7 +204,8 @@
- * @x: Variable to store result.
- * @ptr: Source address, in user space.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * This macro copies a single simple variable from user space to kernel
- * space. It supports simple types like char and int, but not larger
- @@ -499,7 +504,8 @@
- * @x: Value to copy to user space.
- * @ptr: Destination address, in user space.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * This macro copies a single simple value from kernel space to user
- * space. It supports simple types like char and int, but not larger
- @@ -518,7 +524,8 @@
- * @x: Variable to store result.
- * @ptr: Source address, in user space.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * This macro copies a single simple variable from user space to kernel
- * space. It supports simple types like char and int, but not larger
- @@ -538,7 +545,8 @@
- * @x: Value to copy to user space.
- * @ptr: Destination address, in user space.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * This macro copies a single simple value from kernel space to user
- * space. It supports simple types like char and int, but not larger
- @@ -560,7 +568,8 @@
- * @x: Variable to store result.
- * @ptr: Source address, in user space.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * This macro copies a single simple variable from user space to kernel
- * space. It supports simple types like char and int, but not larger
- @@ -816,7 +825,8 @@
- * @from: Source address, in kernel space.
- * @n: Number of bytes to copy.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * Copy data from kernel space to user space. Caller must check
- * the specified block with access_ok() before calling this function.
- @@ -889,7 +899,8 @@
- * @from: Source address, in kernel space.
- * @n: Number of bytes to copy.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * Copy data from kernel space to user space.
- *
- @@ -1076,7 +1087,8 @@
- * @from: Source address, in user space.
- * @n: Number of bytes to copy.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * Copy data from user space to kernel space. Caller must check
- * the specified block with access_ok() before calling this function.
- @@ -1108,7 +1120,8 @@
- * @from: Source address, in user space.
- * @n: Number of bytes to copy.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * Copy data from user space to kernel space.
- *
- @@ -1332,7 +1345,8 @@
- * strlen_user: - Get the size of a string in user space.
- * @str: The string to measure.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * Get the size of a NUL-terminated string in user space.
- *
- @@ -1401,7 +1415,8 @@
- * strnlen_user: - Get the size of a string in user space.
- * @str: The string to measure.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * Get the size of a NUL-terminated string in user space.
- *
- diff -Nur linux-4.1.39.orig/arch/mips/Kconfig linux-4.1.39/arch/mips/Kconfig
- --- linux-4.1.39.orig/arch/mips/Kconfig 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/mips/Kconfig 2017-04-18 17:56:30.557394959 +0200
- @@ -2367,7 +2367,7 @@
- #
- config HIGHMEM
- bool "High Memory Support"
- - depends on 32BIT && CPU_SUPPORTS_HIGHMEM && SYS_SUPPORTS_HIGHMEM && !CPU_MIPS32_3_5_EVA
- + depends on 32BIT && CPU_SUPPORTS_HIGHMEM && SYS_SUPPORTS_HIGHMEM && !CPU_MIPS32_3_5_EVA && !PREEMPT_RT_FULL
-
- config CPU_SUPPORTS_HIGHMEM
- bool
- diff -Nur linux-4.1.39.orig/arch/mips/kernel/signal-common.h linux-4.1.39/arch/mips/kernel/signal-common.h
- --- linux-4.1.39.orig/arch/mips/kernel/signal-common.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/mips/kernel/signal-common.h 2017-04-18 17:56:30.557394959 +0200
- @@ -28,12 +28,7 @@
- extern int fpcsr_pending(unsigned int __user *fpcsr);
-
- /* Make sure we will not lose FPU ownership */
- -#ifdef CONFIG_PREEMPT
- -#define lock_fpu_owner() preempt_disable()
- -#define unlock_fpu_owner() preempt_enable()
- -#else
- -#define lock_fpu_owner() pagefault_disable()
- -#define unlock_fpu_owner() pagefault_enable()
- -#endif
- +#define lock_fpu_owner() ({ preempt_disable(); pagefault_disable(); })
- +#define unlock_fpu_owner() ({ pagefault_enable(); preempt_enable(); })
-
- #endif /* __SIGNAL_COMMON_H */
- diff -Nur linux-4.1.39.orig/arch/mips/mm/fault.c linux-4.1.39/arch/mips/mm/fault.c
- --- linux-4.1.39.orig/arch/mips/mm/fault.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/mips/mm/fault.c 2017-04-18 17:56:30.557394959 +0200
- @@ -21,10 +21,10 @@
- #include <linux/module.h>
- #include <linux/kprobes.h>
- #include <linux/perf_event.h>
- +#include <linux/uaccess.h>
-
- #include <asm/branch.h>
- #include <asm/mmu_context.h>
- -#include <asm/uaccess.h>
- #include <asm/ptrace.h>
- #include <asm/highmem.h> /* For VMALLOC_END */
- #include <linux/kdebug.h>
- @@ -94,7 +94,7 @@
- * If we're in an interrupt or have no user
- * context, we must not take the fault..
- */
- - if (in_atomic() || !mm)
- + if (faulthandler_disabled() || !mm)
- goto bad_area_nosemaphore;
-
- if (user_mode(regs))
- diff -Nur linux-4.1.39.orig/arch/mips/mm/highmem.c linux-4.1.39/arch/mips/mm/highmem.c
- --- linux-4.1.39.orig/arch/mips/mm/highmem.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/mips/mm/highmem.c 2017-04-18 17:56:30.557394959 +0200
- @@ -47,7 +47,7 @@
- unsigned long vaddr;
- int idx, type;
-
- - /* even !CONFIG_PREEMPT needs this, for in_atomic in do_page_fault */
- + preempt_disable();
- pagefault_disable();
- if (!PageHighMem(page))
- return page_address(page);
- @@ -72,6 +72,7 @@
-
- if (vaddr < FIXADDR_START) { // FIXME
- pagefault_enable();
- + preempt_enable();
- return;
- }
-
- @@ -92,6 +93,7 @@
- #endif
- kmap_atomic_idx_pop();
- pagefault_enable();
- + preempt_enable();
- }
- EXPORT_SYMBOL(__kunmap_atomic);
-
- @@ -104,6 +106,7 @@
- unsigned long vaddr;
- int idx, type;
-
- + preempt_disable();
- pagefault_disable();
-
- type = kmap_atomic_idx_push();
- diff -Nur linux-4.1.39.orig/arch/mips/mm/init.c linux-4.1.39/arch/mips/mm/init.c
- --- linux-4.1.39.orig/arch/mips/mm/init.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/mips/mm/init.c 2017-04-18 17:56:30.557394959 +0200
- @@ -90,6 +90,7 @@
-
- BUG_ON(Page_dcache_dirty(page));
-
- + preempt_disable();
- pagefault_disable();
- idx = (addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1);
- idx += in_interrupt() ? FIX_N_COLOURS : 0;
- @@ -152,6 +153,7 @@
- write_c0_entryhi(old_ctx);
- local_irq_restore(flags);
- pagefault_enable();
- + preempt_enable();
- }
-
- void copy_user_highpage(struct page *to, struct page *from,
- diff -Nur linux-4.1.39.orig/arch/mn10300/include/asm/highmem.h linux-4.1.39/arch/mn10300/include/asm/highmem.h
- --- linux-4.1.39.orig/arch/mn10300/include/asm/highmem.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/mn10300/include/asm/highmem.h 2017-04-18 17:56:30.557394959 +0200
- @@ -75,6 +75,7 @@
- unsigned long vaddr;
- int idx, type;
-
- + preempt_disable();
- pagefault_disable();
- if (page < highmem_start_page)
- return page_address(page);
- @@ -98,6 +99,7 @@
-
- if (vaddr < FIXADDR_START) { /* FIXME */
- pagefault_enable();
- + preempt_enable();
- return;
- }
-
- @@ -122,6 +124,7 @@
-
- kmap_atomic_idx_pop();
- pagefault_enable();
- + preempt_enable();
- }
- #endif /* __KERNEL__ */
-
- diff -Nur linux-4.1.39.orig/arch/mn10300/mm/fault.c linux-4.1.39/arch/mn10300/mm/fault.c
- --- linux-4.1.39.orig/arch/mn10300/mm/fault.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/mn10300/mm/fault.c 2017-04-18 17:56:30.557394959 +0200
- @@ -23,8 +23,8 @@
- #include <linux/interrupt.h>
- #include <linux/init.h>
- #include <linux/vt_kern.h> /* For unblank_screen() */
- +#include <linux/uaccess.h>
-
- -#include <asm/uaccess.h>
- #include <asm/pgalloc.h>
- #include <asm/hardirq.h>
- #include <asm/cpu-regs.h>
- @@ -168,7 +168,7 @@
- * If we're in an interrupt or have no user
- * context, we must not take the fault..
- */
- - if (in_atomic() || !mm)
- + if (faulthandler_disabled() || !mm)
- goto no_context;
-
- if ((fault_code & MMUFCR_xFC_ACCESS) == MMUFCR_xFC_ACCESS_USR)
- diff -Nur linux-4.1.39.orig/arch/nios2/mm/fault.c linux-4.1.39/arch/nios2/mm/fault.c
- --- linux-4.1.39.orig/arch/nios2/mm/fault.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/nios2/mm/fault.c 2017-04-18 17:56:30.557394959 +0200
- @@ -77,7 +77,7 @@
- * If we're in an interrupt or have no user
- * context, we must not take the fault..
- */
- - if (in_atomic() || !mm)
- + if (faulthandler_disabled() || !mm)
- goto bad_area_nosemaphore;
-
- if (user_mode(regs))
- diff -Nur linux-4.1.39.orig/arch/parisc/include/asm/cacheflush.h linux-4.1.39/arch/parisc/include/asm/cacheflush.h
- --- linux-4.1.39.orig/arch/parisc/include/asm/cacheflush.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/parisc/include/asm/cacheflush.h 2017-04-18 17:56:30.557394959 +0200
- @@ -142,6 +142,7 @@
-
- static inline void *kmap_atomic(struct page *page)
- {
- + preempt_disable();
- pagefault_disable();
- return page_address(page);
- }
- @@ -150,6 +151,7 @@
- {
- flush_kernel_dcache_page_addr(addr);
- pagefault_enable();
- + preempt_enable();
- }
-
- #define kmap_atomic_prot(page, prot) kmap_atomic(page)
- diff -Nur linux-4.1.39.orig/arch/parisc/kernel/traps.c linux-4.1.39/arch/parisc/kernel/traps.c
- --- linux-4.1.39.orig/arch/parisc/kernel/traps.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/parisc/kernel/traps.c 2017-04-18 17:56:30.557394959 +0200
- @@ -26,9 +26,9 @@
- #include <linux/console.h>
- #include <linux/bug.h>
- #include <linux/ratelimit.h>
- +#include <linux/uaccess.h>
-
- #include <asm/assembly.h>
- -#include <asm/uaccess.h>
- #include <asm/io.h>
- #include <asm/irq.h>
- #include <asm/traps.h>
- @@ -796,7 +796,7 @@
- * unless pagefault_disable() was called before.
- */
-
- - if (fault_space == 0 && !in_atomic())
- + if (fault_space == 0 && !faulthandler_disabled())
- {
- /* Clean up and return if in exception table. */
- if (fixup_exception(regs))
- diff -Nur linux-4.1.39.orig/arch/parisc/mm/fault.c linux-4.1.39/arch/parisc/mm/fault.c
- --- linux-4.1.39.orig/arch/parisc/mm/fault.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/parisc/mm/fault.c 2017-04-18 17:56:30.557394959 +0200
- @@ -15,8 +15,8 @@
- #include <linux/sched.h>
- #include <linux/interrupt.h>
- #include <linux/module.h>
- +#include <linux/uaccess.h>
-
- -#include <asm/uaccess.h>
- #include <asm/traps.h>
-
- /* Various important other fields */
- @@ -208,7 +208,7 @@
- int fault;
- unsigned int flags;
-
- - if (in_atomic())
- + if (pagefault_disabled())
- goto no_context;
-
- tsk = current;
- diff -Nur linux-4.1.39.orig/arch/powerpc/include/asm/kvm_host.h linux-4.1.39/arch/powerpc/include/asm/kvm_host.h
- --- linux-4.1.39.orig/arch/powerpc/include/asm/kvm_host.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/powerpc/include/asm/kvm_host.h 2017-04-18 17:56:30.557394959 +0200
- @@ -280,7 +280,7 @@
- u8 in_guest;
- struct list_head runnable_threads;
- spinlock_t lock;
- - wait_queue_head_t wq;
- + struct swait_head wq;
- spinlock_t stoltb_lock; /* protects stolen_tb and preempt_tb */
- u64 stolen_tb;
- u64 preempt_tb;
- @@ -614,7 +614,7 @@
- u8 prodded;
- u32 last_inst;
-
- - wait_queue_head_t *wqp;
- + struct swait_head *wqp;
- struct kvmppc_vcore *vcore;
- int ret;
- int trap;
- diff -Nur linux-4.1.39.orig/arch/powerpc/include/asm/thread_info.h linux-4.1.39/arch/powerpc/include/asm/thread_info.h
- --- linux-4.1.39.orig/arch/powerpc/include/asm/thread_info.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/powerpc/include/asm/thread_info.h 2017-04-18 17:56:30.557394959 +0200
- @@ -42,6 +42,8 @@
- int cpu; /* cpu we're on */
- int preempt_count; /* 0 => preemptable,
- <0 => BUG */
- + int preempt_lazy_count; /* 0 => preemptable,
- + <0 => BUG */
- unsigned long local_flags; /* private flags for thread */
-
- /* low level flags - has atomic operations done on it */
- @@ -82,8 +84,7 @@
- #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
- #define TIF_SIGPENDING 1 /* signal pending */
- #define TIF_NEED_RESCHED 2 /* rescheduling necessary */
- -#define TIF_POLLING_NRFLAG 3 /* true if poll_idle() is polling
- - TIF_NEED_RESCHED */
- +#define TIF_NEED_RESCHED_LAZY 3 /* lazy rescheduling necessary */
- #define TIF_32BIT 4 /* 32 bit binary */
- #define TIF_RESTORE_TM 5 /* need to restore TM FP/VEC/VSX */
- #define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */
- @@ -101,6 +102,8 @@
- #if defined(CONFIG_PPC64)
- #define TIF_ELF2ABI 18 /* function descriptors must die! */
- #endif
- +#define TIF_POLLING_NRFLAG 19 /* true if poll_idle() is polling
- + TIF_NEED_RESCHED */
-
- /* as above, but as bit values */
- #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
- @@ -119,14 +122,16 @@
- #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
- #define _TIF_EMULATE_STACK_STORE (1<<TIF_EMULATE_STACK_STORE)
- #define _TIF_NOHZ (1<<TIF_NOHZ)
- +#define _TIF_NEED_RESCHED_LAZY (1<<TIF_NEED_RESCHED_LAZY)
- #define _TIF_SYSCALL_DOTRACE (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
- _TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT | \
- _TIF_NOHZ)
-
- #define _TIF_USER_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
- _TIF_NOTIFY_RESUME | _TIF_UPROBE | \
- - _TIF_RESTORE_TM)
- + _TIF_RESTORE_TM | _TIF_NEED_RESCHED_LAZY)
- #define _TIF_PERSYSCALL_MASK (_TIF_RESTOREALL|_TIF_NOERROR)
- +#define _TIF_NEED_RESCHED_MASK (_TIF_NEED_RESCHED | _TIF_NEED_RESCHED_LAZY)
-
- /* Bits in local_flags */
- /* Don't move TLF_NAPPING without adjusting the code in entry_32.S */
- diff -Nur linux-4.1.39.orig/arch/powerpc/Kconfig linux-4.1.39/arch/powerpc/Kconfig
- --- linux-4.1.39.orig/arch/powerpc/Kconfig 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/powerpc/Kconfig 2017-04-18 17:56:30.557394959 +0200
- @@ -60,10 +60,11 @@
-
- config RWSEM_GENERIC_SPINLOCK
- bool
- + default y if PREEMPT_RT_FULL
-
- config RWSEM_XCHGADD_ALGORITHM
- bool
- - default y
- + default y if !PREEMPT_RT_FULL
-
- config GENERIC_LOCKBREAK
- bool
- @@ -138,6 +139,7 @@
- select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
- select GENERIC_STRNCPY_FROM_USER
- select GENERIC_STRNLEN_USER
- + select HAVE_PREEMPT_LAZY
- select HAVE_MOD_ARCH_SPECIFIC
- select MODULES_USE_ELF_RELA
- select CLONE_BACKWARDS
- @@ -312,7 +314,7 @@
-
- config HIGHMEM
- bool "High memory support"
- - depends on PPC32
- + depends on PPC32 && !PREEMPT_RT_FULL
-
- source kernel/Kconfig.hz
- source kernel/Kconfig.preempt
- diff -Nur linux-4.1.39.orig/arch/powerpc/kernel/asm-offsets.c linux-4.1.39/arch/powerpc/kernel/asm-offsets.c
- --- linux-4.1.39.orig/arch/powerpc/kernel/asm-offsets.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/powerpc/kernel/asm-offsets.c 2017-04-18 17:56:30.557394959 +0200
- @@ -160,6 +160,7 @@
- DEFINE(TI_FLAGS, offsetof(struct thread_info, flags));
- DEFINE(TI_LOCAL_FLAGS, offsetof(struct thread_info, local_flags));
- DEFINE(TI_PREEMPT, offsetof(struct thread_info, preempt_count));
- + DEFINE(TI_PREEMPT_LAZY, offsetof(struct thread_info, preempt_lazy_count));
- DEFINE(TI_TASK, offsetof(struct thread_info, task));
- DEFINE(TI_CPU, offsetof(struct thread_info, cpu));
-
- diff -Nur linux-4.1.39.orig/arch/powerpc/kernel/entry_32.S linux-4.1.39/arch/powerpc/kernel/entry_32.S
- --- linux-4.1.39.orig/arch/powerpc/kernel/entry_32.S 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/powerpc/kernel/entry_32.S 2017-04-18 17:56:30.557394959 +0200
- @@ -813,7 +813,14 @@
- cmpwi 0,r0,0 /* if non-zero, just restore regs and return */
- bne restore
- andi. r8,r8,_TIF_NEED_RESCHED
- + bne+ 1f
- + lwz r0,TI_PREEMPT_LAZY(r9)
- + cmpwi 0,r0,0 /* if non-zero, just restore regs and return */
- + bne restore
- + lwz r0,TI_FLAGS(r9)
- + andi. r0,r0,_TIF_NEED_RESCHED_LAZY
- beq+ restore
- +1:
- lwz r3,_MSR(r1)
- andi. r0,r3,MSR_EE /* interrupts off? */
- beq restore /* don't schedule if so */
- @@ -824,11 +831,11 @@
- */
- bl trace_hardirqs_off
- #endif
- -1: bl preempt_schedule_irq
- +2: bl preempt_schedule_irq
- CURRENT_THREAD_INFO(r9, r1)
- lwz r3,TI_FLAGS(r9)
- - andi. r0,r3,_TIF_NEED_RESCHED
- - bne- 1b
- + andi. r0,r3,_TIF_NEED_RESCHED_MASK
- + bne- 2b
- #ifdef CONFIG_TRACE_IRQFLAGS
- /* And now, to properly rebalance the above, we tell lockdep they
- * are being turned back on, which will happen when we return
- @@ -1149,7 +1156,7 @@
- #endif /* !(CONFIG_4xx || CONFIG_BOOKE) */
-
- do_work: /* r10 contains MSR_KERNEL here */
- - andi. r0,r9,_TIF_NEED_RESCHED
- + andi. r0,r9,_TIF_NEED_RESCHED_MASK
- beq do_user_signal
-
- do_resched: /* r10 contains MSR_KERNEL here */
- @@ -1170,7 +1177,7 @@
- MTMSRD(r10) /* disable interrupts */
- CURRENT_THREAD_INFO(r9, r1)
- lwz r9,TI_FLAGS(r9)
- - andi. r0,r9,_TIF_NEED_RESCHED
- + andi. r0,r9,_TIF_NEED_RESCHED_MASK
- bne- do_resched
- andi. r0,r9,_TIF_USER_WORK_MASK
- beq restore_user
- diff -Nur linux-4.1.39.orig/arch/powerpc/kernel/entry_64.S linux-4.1.39/arch/powerpc/kernel/entry_64.S
- --- linux-4.1.39.orig/arch/powerpc/kernel/entry_64.S 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/powerpc/kernel/entry_64.S 2017-04-18 17:56:30.561395114 +0200
- @@ -636,7 +636,7 @@
- #else
- beq restore
- #endif
- -1: andi. r0,r4,_TIF_NEED_RESCHED
- +1: andi. r0,r4,_TIF_NEED_RESCHED_MASK
- beq 2f
- bl restore_interrupts
- SCHEDULE_USER
- @@ -698,10 +698,18 @@
-
- #ifdef CONFIG_PREEMPT
- /* Check if we need to preempt */
- + lwz r8,TI_PREEMPT(r9)
- + cmpwi 0,r8,0 /* if non-zero, just restore regs and return */
- + bne restore
- andi. r0,r4,_TIF_NEED_RESCHED
- + bne+ check_count
- +
- + andi. r0,r4,_TIF_NEED_RESCHED_LAZY
- beq+ restore
- + lwz r8,TI_PREEMPT_LAZY(r9)
- +
- /* Check that preempt_count() == 0 and interrupts are enabled */
- - lwz r8,TI_PREEMPT(r9)
- +check_count:
- cmpwi cr1,r8,0
- ld r0,SOFTE(r1)
- cmpdi r0,0
- @@ -718,7 +726,7 @@
- /* Re-test flags and eventually loop */
- CURRENT_THREAD_INFO(r9, r1)
- ld r4,TI_FLAGS(r9)
- - andi. r0,r4,_TIF_NEED_RESCHED
- + andi. r0,r4,_TIF_NEED_RESCHED_MASK
- bne 1b
-
- /*
- diff -Nur linux-4.1.39.orig/arch/powerpc/kernel/irq.c linux-4.1.39/arch/powerpc/kernel/irq.c
- --- linux-4.1.39.orig/arch/powerpc/kernel/irq.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/powerpc/kernel/irq.c 2017-04-18 17:56:30.561395114 +0200
- @@ -614,6 +614,7 @@
- }
- }
-
- +#ifndef CONFIG_PREEMPT_RT_FULL
- void do_softirq_own_stack(void)
- {
- struct thread_info *curtp, *irqtp;
- @@ -631,6 +632,7 @@
- if (irqtp->flags)
- set_bits(irqtp->flags, &curtp->flags);
- }
- +#endif
-
- irq_hw_number_t virq_to_hw(unsigned int virq)
- {
- diff -Nur linux-4.1.39.orig/arch/powerpc/kernel/misc_32.S linux-4.1.39/arch/powerpc/kernel/misc_32.S
- --- linux-4.1.39.orig/arch/powerpc/kernel/misc_32.S 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/powerpc/kernel/misc_32.S 2017-04-18 17:56:30.561395114 +0200
- @@ -40,6 +40,7 @@
- * We store the saved ksp_limit in the unused part
- * of the STACK_FRAME_OVERHEAD
- */
- +#ifndef CONFIG_PREEMPT_RT_FULL
- _GLOBAL(call_do_softirq)
- mflr r0
- stw r0,4(r1)
- @@ -56,6 +57,7 @@
- stw r10,THREAD+KSP_LIMIT(r2)
- mtlr r0
- blr
- +#endif
-
- /*
- * void call_do_irq(struct pt_regs *regs, struct thread_info *irqtp);
- diff -Nur linux-4.1.39.orig/arch/powerpc/kernel/misc_64.S linux-4.1.39/arch/powerpc/kernel/misc_64.S
- --- linux-4.1.39.orig/arch/powerpc/kernel/misc_64.S 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/powerpc/kernel/misc_64.S 2017-04-18 17:56:30.561395114 +0200
- @@ -29,6 +29,7 @@
-
- .text
-
- +#ifndef CONFIG_PREEMPT_RT_FULL
- _GLOBAL(call_do_softirq)
- mflr r0
- std r0,16(r1)
- @@ -39,6 +40,7 @@
- ld r0,16(r1)
- mtlr r0
- blr
- +#endif
-
- _GLOBAL(call_do_irq)
- mflr r0
- diff -Nur linux-4.1.39.orig/arch/powerpc/kvm/book3s_hv.c linux-4.1.39/arch/powerpc/kvm/book3s_hv.c
- --- linux-4.1.39.orig/arch/powerpc/kvm/book3s_hv.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/powerpc/kvm/book3s_hv.c 2017-04-18 17:56:30.561395114 +0200
- @@ -115,11 +115,11 @@
- static void kvmppc_fast_vcpu_kick_hv(struct kvm_vcpu *vcpu)
- {
- int cpu = vcpu->cpu;
- - wait_queue_head_t *wqp;
- + struct swait_head *wqp;
-
- wqp = kvm_arch_vcpu_wq(vcpu);
- - if (waitqueue_active(wqp)) {
- - wake_up_interruptible(wqp);
- + if (swaitqueue_active(wqp)) {
- + swait_wake_interruptible(wqp);
- ++vcpu->stat.halt_wakeup;
- }
-
- @@ -692,8 +692,8 @@
- tvcpu->arch.prodded = 1;
- smp_mb();
- if (vcpu->arch.ceded) {
- - if (waitqueue_active(&vcpu->wq)) {
- - wake_up_interruptible(&vcpu->wq);
- + if (swaitqueue_active(&vcpu->wq)) {
- + swait_wake_interruptible(&vcpu->wq);
- vcpu->stat.halt_wakeup++;
- }
- }
- @@ -1438,7 +1438,7 @@
- INIT_LIST_HEAD(&vcore->runnable_threads);
- spin_lock_init(&vcore->lock);
- spin_lock_init(&vcore->stoltb_lock);
- - init_waitqueue_head(&vcore->wq);
- + init_swait_head(&vcore->wq);
- vcore->preempt_tb = TB_NIL;
- vcore->lpcr = kvm->arch.lpcr;
- vcore->first_vcpuid = core * threads_per_subcore;
- @@ -2085,10 +2085,9 @@
- {
- struct kvm_vcpu *vcpu;
- int do_sleep = 1;
- + DEFINE_SWAITER(wait);
-
- - DEFINE_WAIT(wait);
- -
- - prepare_to_wait(&vc->wq, &wait, TASK_INTERRUPTIBLE);
- + swait_prepare(&vc->wq, &wait, TASK_INTERRUPTIBLE);
-
- /*
- * Check one last time for pending exceptions and ceded state after
- @@ -2102,7 +2101,7 @@
- }
-
- if (!do_sleep) {
- - finish_wait(&vc->wq, &wait);
- + swait_finish(&vc->wq, &wait);
- return;
- }
-
- @@ -2110,7 +2109,7 @@
- trace_kvmppc_vcore_blocked(vc, 0);
- spin_unlock(&vc->lock);
- schedule();
- - finish_wait(&vc->wq, &wait);
- + swait_finish(&vc->wq, &wait);
- spin_lock(&vc->lock);
- vc->vcore_state = VCORE_INACTIVE;
- trace_kvmppc_vcore_blocked(vc, 1);
- @@ -2154,7 +2153,7 @@
- kvmppc_start_thread(vcpu);
- trace_kvm_guest_enter(vcpu);
- } else if (vc->vcore_state == VCORE_SLEEPING) {
- - wake_up(&vc->wq);
- + swait_wake(&vc->wq);
- }
-
- }
- diff -Nur linux-4.1.39.orig/arch/powerpc/kvm/Kconfig linux-4.1.39/arch/powerpc/kvm/Kconfig
- --- linux-4.1.39.orig/arch/powerpc/kvm/Kconfig 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/powerpc/kvm/Kconfig 2017-04-18 17:56:30.561395114 +0200
- @@ -172,6 +172,7 @@
- config KVM_MPIC
- bool "KVM in-kernel MPIC emulation"
- depends on KVM && E500
- + depends on !PREEMPT_RT_FULL
- select HAVE_KVM_IRQCHIP
- select HAVE_KVM_IRQFD
- select HAVE_KVM_IRQ_ROUTING
- diff -Nur linux-4.1.39.orig/arch/powerpc/mm/fault.c linux-4.1.39/arch/powerpc/mm/fault.c
- --- linux-4.1.39.orig/arch/powerpc/mm/fault.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/powerpc/mm/fault.c 2017-04-18 17:56:30.561395114 +0200
- @@ -33,13 +33,13 @@
- #include <linux/ratelimit.h>
- #include <linux/context_tracking.h>
- #include <linux/hugetlb.h>
- +#include <linux/uaccess.h>
-
- #include <asm/firmware.h>
- #include <asm/page.h>
- #include <asm/pgtable.h>
- #include <asm/mmu.h>
- #include <asm/mmu_context.h>
- -#include <asm/uaccess.h>
- #include <asm/tlbflush.h>
- #include <asm/siginfo.h>
- #include <asm/debug.h>
- @@ -272,15 +272,16 @@
- if (!arch_irq_disabled_regs(regs))
- local_irq_enable();
-
- - if (in_atomic() || mm == NULL) {
- + if (faulthandler_disabled() || mm == NULL) {
- if (!user_mode(regs)) {
- rc = SIGSEGV;
- goto bail;
- }
- - /* in_atomic() in user mode is really bad,
- + /* faulthandler_disabled() in user mode is really bad,
- as is current->mm == NULL. */
- printk(KERN_EMERG "Page fault in user mode with "
- - "in_atomic() = %d mm = %p\n", in_atomic(), mm);
- + "faulthandler_disabled() = %d mm = %p\n",
- + faulthandler_disabled(), mm);
- printk(KERN_EMERG "NIP = %lx MSR = %lx\n",
- regs->nip, regs->msr);
- die("Weird page fault", regs, SIGSEGV);
- diff -Nur linux-4.1.39.orig/arch/powerpc/mm/highmem.c linux-4.1.39/arch/powerpc/mm/highmem.c
- --- linux-4.1.39.orig/arch/powerpc/mm/highmem.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/powerpc/mm/highmem.c 2017-04-18 17:56:30.561395114 +0200
- @@ -34,7 +34,7 @@
- unsigned long vaddr;
- int idx, type;
-
- - /* even !CONFIG_PREEMPT needs this, for in_atomic in do_page_fault */
- + preempt_disable();
- pagefault_disable();
- if (!PageHighMem(page))
- return page_address(page);
- @@ -59,6 +59,7 @@
-
- if (vaddr < __fix_to_virt(FIX_KMAP_END)) {
- pagefault_enable();
- + preempt_enable();
- return;
- }
-
- @@ -82,5 +83,6 @@
-
- kmap_atomic_idx_pop();
- pagefault_enable();
- + preempt_enable();
- }
- EXPORT_SYMBOL(__kunmap_atomic);
- diff -Nur linux-4.1.39.orig/arch/powerpc/platforms/ps3/device-init.c linux-4.1.39/arch/powerpc/platforms/ps3/device-init.c
- --- linux-4.1.39.orig/arch/powerpc/platforms/ps3/device-init.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/powerpc/platforms/ps3/device-init.c 2017-04-18 17:56:30.561395114 +0200
- @@ -752,7 +752,7 @@
- }
- pr_debug("%s:%u: notification %s issued\n", __func__, __LINE__, op);
-
- - res = wait_event_interruptible(dev->done.wait,
- + res = swait_event_interruptible(dev->done.wait,
- dev->done.done || kthread_should_stop());
- if (kthread_should_stop())
- res = -EINTR;
- diff -Nur linux-4.1.39.orig/arch/s390/include/asm/kvm_host.h linux-4.1.39/arch/s390/include/asm/kvm_host.h
- --- linux-4.1.39.orig/arch/s390/include/asm/kvm_host.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/s390/include/asm/kvm_host.h 2017-04-18 17:56:30.561395114 +0200
- @@ -419,7 +419,7 @@
- struct kvm_s390_local_interrupt {
- spinlock_t lock;
- struct kvm_s390_float_interrupt *float_int;
- - wait_queue_head_t *wq;
- + struct swait_head *wq;
- atomic_t *cpuflags;
- DECLARE_BITMAP(sigp_emerg_pending, KVM_MAX_VCPUS);
- struct kvm_s390_irq_payload irq;
- diff -Nur linux-4.1.39.orig/arch/s390/include/asm/uaccess.h linux-4.1.39/arch/s390/include/asm/uaccess.h
- --- linux-4.1.39.orig/arch/s390/include/asm/uaccess.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/s390/include/asm/uaccess.h 2017-04-18 17:56:30.561395114 +0200
- @@ -98,7 +98,8 @@
- * @from: Source address, in user space.
- * @n: Number of bytes to copy.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * Copy data from user space to kernel space. Caller must check
- * the specified block with access_ok() before calling this function.
- @@ -118,7 +119,8 @@
- * @from: Source address, in kernel space.
- * @n: Number of bytes to copy.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * Copy data from kernel space to user space. Caller must check
- * the specified block with access_ok() before calling this function.
- @@ -264,7 +266,8 @@
- * @from: Source address, in kernel space.
- * @n: Number of bytes to copy.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * Copy data from kernel space to user space.
- *
- @@ -290,7 +293,8 @@
- * @from: Source address, in user space.
- * @n: Number of bytes to copy.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * Copy data from user space to kernel space.
- *
- @@ -348,7 +352,8 @@
- * strlen_user: - Get the size of a string in user space.
- * @str: The string to measure.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * Get the size of a NUL-terminated string in user space.
- *
- diff -Nur linux-4.1.39.orig/arch/s390/kvm/interrupt.c linux-4.1.39/arch/s390/kvm/interrupt.c
- --- linux-4.1.39.orig/arch/s390/kvm/interrupt.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/s390/kvm/interrupt.c 2017-04-18 17:56:30.561395114 +0200
- @@ -875,13 +875,13 @@
-
- void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu)
- {
- - if (waitqueue_active(&vcpu->wq)) {
- + if (swaitqueue_active(&vcpu->wq)) {
- /*
- * The vcpu gave up the cpu voluntarily, mark it as a good
- * yield-candidate.
- */
- vcpu->preempted = true;
- - wake_up_interruptible(&vcpu->wq);
- + swait_wake_interruptible(&vcpu->wq);
- vcpu->stat.halt_wakeup++;
- }
- }
- @@ -987,7 +987,7 @@
- spin_lock(&li->lock);
- irq.u.pgm.code = code;
- __inject_prog(vcpu, &irq);
- - BUG_ON(waitqueue_active(li->wq));
- + BUG_ON(swaitqueue_active(li->wq));
- spin_unlock(&li->lock);
- return 0;
- }
- @@ -1006,7 +1006,7 @@
- spin_lock(&li->lock);
- irq.u.pgm = *pgm_info;
- rc = __inject_prog(vcpu, &irq);
- - BUG_ON(waitqueue_active(li->wq));
- + BUG_ON(swaitqueue_active(li->wq));
- spin_unlock(&li->lock);
- return rc;
- }
- diff -Nur linux-4.1.39.orig/arch/s390/mm/fault.c linux-4.1.39/arch/s390/mm/fault.c
- --- linux-4.1.39.orig/arch/s390/mm/fault.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/s390/mm/fault.c 2017-04-18 17:56:30.561395114 +0200
- @@ -399,7 +399,7 @@
- * user context.
- */
- fault = VM_FAULT_BADCONTEXT;
- - if (unlikely(!user_space_fault(regs) || in_atomic() || !mm))
- + if (unlikely(!user_space_fault(regs) || faulthandler_disabled() || !mm))
- goto out;
-
- address = trans_exc_code & __FAIL_ADDR_MASK;
- diff -Nur linux-4.1.39.orig/arch/score/include/asm/uaccess.h linux-4.1.39/arch/score/include/asm/uaccess.h
- --- linux-4.1.39.orig/arch/score/include/asm/uaccess.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/score/include/asm/uaccess.h 2017-04-18 17:56:30.561395114 +0200
- @@ -36,7 +36,8 @@
- * @addr: User space pointer to start of block to check
- * @size: Size of block to check
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * Checks if a pointer to a block of memory in user space is valid.
- *
- @@ -61,7 +62,8 @@
- * @x: Value to copy to user space.
- * @ptr: Destination address, in user space.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * This macro copies a single simple value from kernel space to user
- * space. It supports simple types like char and int, but not larger
- @@ -79,7 +81,8 @@
- * @x: Variable to store result.
- * @ptr: Source address, in user space.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * This macro copies a single simple variable from user space to kernel
- * space. It supports simple types like char and int, but not larger
- @@ -98,7 +101,8 @@
- * @x: Value to copy to user space.
- * @ptr: Destination address, in user space.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * This macro copies a single simple value from kernel space to user
- * space. It supports simple types like char and int, but not larger
- @@ -119,7 +123,8 @@
- * @x: Variable to store result.
- * @ptr: Source address, in user space.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * This macro copies a single simple variable from user space to kernel
- * space. It supports simple types like char and int, but not larger
- diff -Nur linux-4.1.39.orig/arch/score/mm/fault.c linux-4.1.39/arch/score/mm/fault.c
- --- linux-4.1.39.orig/arch/score/mm/fault.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/score/mm/fault.c 2017-04-18 17:56:30.561395114 +0200
- @@ -34,6 +34,7 @@
- #include <linux/string.h>
- #include <linux/types.h>
- #include <linux/ptrace.h>
- +#include <linux/uaccess.h>
-
- /*
- * This routine handles page faults. It determines the address,
- @@ -73,7 +74,7 @@
- * If we're in an interrupt or have no user
- * context, we must not take the fault..
- */
- - if (in_atomic() || !mm)
- + if (pagefault_disabled() || !mm)
- goto bad_area_nosemaphore;
-
- if (user_mode(regs))
- diff -Nur linux-4.1.39.orig/arch/sh/kernel/irq.c linux-4.1.39/arch/sh/kernel/irq.c
- --- linux-4.1.39.orig/arch/sh/kernel/irq.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/sh/kernel/irq.c 2017-04-18 17:56:30.561395114 +0200
- @@ -147,6 +147,7 @@
- hardirq_ctx[cpu] = NULL;
- }
-
- +#ifndef CONFIG_PREEMPT_RT_FULL
- void do_softirq_own_stack(void)
- {
- struct thread_info *curctx;
- @@ -174,6 +175,7 @@
- "r5", "r6", "r7", "r8", "r9", "r15", "t", "pr"
- );
- }
- +#endif
- #else
- static inline void handle_one_irq(unsigned int irq)
- {
- diff -Nur linux-4.1.39.orig/arch/sh/mm/fault.c linux-4.1.39/arch/sh/mm/fault.c
- --- linux-4.1.39.orig/arch/sh/mm/fault.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/sh/mm/fault.c 2017-04-18 17:56:30.561395114 +0200
- @@ -17,6 +17,7 @@
- #include <linux/kprobes.h>
- #include <linux/perf_event.h>
- #include <linux/kdebug.h>
- +#include <linux/uaccess.h>
- #include <asm/io_trapped.h>
- #include <asm/mmu_context.h>
- #include <asm/tlbflush.h>
- @@ -438,9 +439,9 @@
-
- /*
- * If we're in an interrupt, have no user context or are running
- - * in an atomic region then we must not take the fault:
- + * with pagefaults disabled then we must not take the fault:
- */
- - if (unlikely(in_atomic() || !mm)) {
- + if (unlikely(faulthandler_disabled() || !mm)) {
- bad_area_nosemaphore(regs, error_code, address);
- return;
- }
- diff -Nur linux-4.1.39.orig/arch/sparc/Kconfig linux-4.1.39/arch/sparc/Kconfig
- --- linux-4.1.39.orig/arch/sparc/Kconfig 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/sparc/Kconfig 2017-04-18 17:56:30.561395114 +0200
- @@ -189,12 +189,10 @@
- source kernel/Kconfig.hz
-
- config RWSEM_GENERIC_SPINLOCK
- - bool
- - default y if SPARC32
- + def_bool PREEMPT_RT_FULL
-
- config RWSEM_XCHGADD_ALGORITHM
- - bool
- - default y if SPARC64
- + def_bool !RWSEM_GENERIC_SPINLOCK && !PREEMPT_RT_FULL
-
- config GENERIC_HWEIGHT
- bool
- diff -Nur linux-4.1.39.orig/arch/sparc/kernel/irq_64.c linux-4.1.39/arch/sparc/kernel/irq_64.c
- --- linux-4.1.39.orig/arch/sparc/kernel/irq_64.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/sparc/kernel/irq_64.c 2017-04-18 17:56:30.561395114 +0200
- @@ -849,6 +849,7 @@
- set_irq_regs(old_regs);
- }
-
- +#ifndef CONFIG_PREEMPT_RT_FULL
- void do_softirq_own_stack(void)
- {
- void *orig_sp, *sp = softirq_stack[smp_processor_id()];
- @@ -863,6 +864,7 @@
- __asm__ __volatile__("mov %0, %%sp"
- : : "r" (orig_sp));
- }
- +#endif
-
- #ifdef CONFIG_HOTPLUG_CPU
- void fixup_irqs(void)
- diff -Nur linux-4.1.39.orig/arch/sparc/mm/fault_32.c linux-4.1.39/arch/sparc/mm/fault_32.c
- --- linux-4.1.39.orig/arch/sparc/mm/fault_32.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/sparc/mm/fault_32.c 2017-04-18 17:56:30.561395114 +0200
- @@ -21,6 +21,7 @@
- #include <linux/perf_event.h>
- #include <linux/interrupt.h>
- #include <linux/kdebug.h>
- +#include <linux/uaccess.h>
-
- #include <asm/page.h>
- #include <asm/pgtable.h>
- @@ -29,7 +30,6 @@
- #include <asm/setup.h>
- #include <asm/smp.h>
- #include <asm/traps.h>
- -#include <asm/uaccess.h>
-
- #include "mm_32.h"
-
- @@ -196,7 +196,7 @@
- * If we're in an interrupt or have no user
- * context, we must not take the fault..
- */
- - if (in_atomic() || !mm)
- + if (pagefault_disabled() || !mm)
- goto no_context;
-
- perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address);
- diff -Nur linux-4.1.39.orig/arch/sparc/mm/fault_64.c linux-4.1.39/arch/sparc/mm/fault_64.c
- --- linux-4.1.39.orig/arch/sparc/mm/fault_64.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/sparc/mm/fault_64.c 2017-04-18 17:56:30.561395114 +0200
- @@ -22,12 +22,12 @@
- #include <linux/kdebug.h>
- #include <linux/percpu.h>
- #include <linux/context_tracking.h>
- +#include <linux/uaccess.h>
-
- #include <asm/page.h>
- #include <asm/pgtable.h>
- #include <asm/openprom.h>
- #include <asm/oplib.h>
- -#include <asm/uaccess.h>
- #include <asm/asi.h>
- #include <asm/lsu.h>
- #include <asm/sections.h>
- @@ -330,7 +330,7 @@
- * If we're in an interrupt or have no user
- * context, we must not take the fault..
- */
- - if (in_atomic() || !mm)
- + if (faulthandler_disabled() || !mm)
- goto intr_or_no_mm;
-
- perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address);
- diff -Nur linux-4.1.39.orig/arch/sparc/mm/highmem.c linux-4.1.39/arch/sparc/mm/highmem.c
- --- linux-4.1.39.orig/arch/sparc/mm/highmem.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/sparc/mm/highmem.c 2017-04-18 17:56:30.561395114 +0200
- @@ -53,7 +53,7 @@
- unsigned long vaddr;
- long idx, type;
-
- - /* even !CONFIG_PREEMPT needs this, for in_atomic in do_page_fault */
- + preempt_disable();
- pagefault_disable();
- if (!PageHighMem(page))
- return page_address(page);
- @@ -91,6 +91,7 @@
-
- if (vaddr < FIXADDR_START) { // FIXME
- pagefault_enable();
- + preempt_enable();
- return;
- }
-
- @@ -126,5 +127,6 @@
-
- kmap_atomic_idx_pop();
- pagefault_enable();
- + preempt_enable();
- }
- EXPORT_SYMBOL(__kunmap_atomic);
- diff -Nur linux-4.1.39.orig/arch/sparc/mm/init_64.c linux-4.1.39/arch/sparc/mm/init_64.c
- --- linux-4.1.39.orig/arch/sparc/mm/init_64.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/sparc/mm/init_64.c 2017-04-18 17:56:30.565395270 +0200
- @@ -2738,7 +2738,7 @@
- struct mm_struct *mm = current->mm;
- struct tsb_config *tp;
-
- - if (in_atomic() || !mm) {
- + if (faulthandler_disabled() || !mm) {
- const struct exception_table_entry *entry;
-
- entry = search_exception_tables(regs->tpc);
- diff -Nur linux-4.1.39.orig/arch/tile/include/asm/uaccess.h linux-4.1.39/arch/tile/include/asm/uaccess.h
- --- linux-4.1.39.orig/arch/tile/include/asm/uaccess.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/tile/include/asm/uaccess.h 2017-04-18 17:56:30.565395270 +0200
- @@ -78,7 +78,8 @@
- * @addr: User space pointer to start of block to check
- * @size: Size of block to check
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * Checks if a pointer to a block of memory in user space is valid.
- *
- @@ -192,7 +193,8 @@
- * @x: Variable to store result.
- * @ptr: Source address, in user space.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * This macro copies a single simple variable from user space to kernel
- * space. It supports simple types like char and int, but not larger
- @@ -274,7 +276,8 @@
- * @x: Value to copy to user space.
- * @ptr: Destination address, in user space.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * This macro copies a single simple value from kernel space to user
- * space. It supports simple types like char and int, but not larger
- @@ -330,7 +333,8 @@
- * @from: Source address, in kernel space.
- * @n: Number of bytes to copy.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * Copy data from kernel space to user space. Caller must check
- * the specified block with access_ok() before calling this function.
- @@ -366,7 +370,8 @@
- * @from: Source address, in user space.
- * @n: Number of bytes to copy.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * Copy data from user space to kernel space. Caller must check
- * the specified block with access_ok() before calling this function.
- @@ -437,7 +442,8 @@
- * @from: Source address, in user space.
- * @n: Number of bytes to copy.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * Copy data from user space to user space. Caller must check
- * the specified blocks with access_ok() before calling this function.
- diff -Nur linux-4.1.39.orig/arch/tile/mm/fault.c linux-4.1.39/arch/tile/mm/fault.c
- --- linux-4.1.39.orig/arch/tile/mm/fault.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/tile/mm/fault.c 2017-04-18 17:56:30.565395270 +0200
- @@ -354,9 +354,9 @@
-
- /*
- * If we're in an interrupt, have no user context or are running in an
- - * atomic region then we must not take the fault.
- + * region with pagefaults disabled then we must not take the fault.
- */
- - if (in_atomic() || !mm) {
- + if (pagefault_disabled() || !mm) {
- vma = NULL; /* happy compiler */
- goto bad_area_nosemaphore;
- }
- diff -Nur linux-4.1.39.orig/arch/tile/mm/highmem.c linux-4.1.39/arch/tile/mm/highmem.c
- --- linux-4.1.39.orig/arch/tile/mm/highmem.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/tile/mm/highmem.c 2017-04-18 17:56:30.565395270 +0200
- @@ -201,7 +201,7 @@
- int idx, type;
- pte_t *pte;
-
- - /* even !CONFIG_PREEMPT needs this, for in_atomic in do_page_fault */
- + preempt_disable();
- pagefault_disable();
-
- /* Avoid icache flushes by disallowing atomic executable mappings. */
- @@ -259,6 +259,7 @@
- }
-
- pagefault_enable();
- + preempt_enable();
- }
- EXPORT_SYMBOL(__kunmap_atomic);
-
- diff -Nur linux-4.1.39.orig/arch/um/kernel/trap.c linux-4.1.39/arch/um/kernel/trap.c
- --- linux-4.1.39.orig/arch/um/kernel/trap.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/um/kernel/trap.c 2017-04-18 17:56:30.565395270 +0200
- @@ -35,10 +35,10 @@
- *code_out = SEGV_MAPERR;
-
- /*
- - * If the fault was during atomic operation, don't take the fault, just
- + * If the fault was with pagefaults disabled, don't take the fault, just
- * fail.
- */
- - if (in_atomic())
- + if (faulthandler_disabled())
- goto out_nosemaphore;
-
- if (is_user)
- diff -Nur linux-4.1.39.orig/arch/unicore32/mm/fault.c linux-4.1.39/arch/unicore32/mm/fault.c
- --- linux-4.1.39.orig/arch/unicore32/mm/fault.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/unicore32/mm/fault.c 2017-04-18 17:56:30.565395270 +0200
- @@ -218,7 +218,7 @@
- * If we're in an interrupt or have no user
- * context, we must not take the fault..
- */
- - if (in_atomic() || !mm)
- + if (faulthandler_disabled() || !mm)
- goto no_context;
-
- if (user_mode(regs))
- diff -Nur linux-4.1.39.orig/arch/x86/crypto/aesni-intel_glue.c linux-4.1.39/arch/x86/crypto/aesni-intel_glue.c
- --- linux-4.1.39.orig/arch/x86/crypto/aesni-intel_glue.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/x86/crypto/aesni-intel_glue.c 2017-04-18 17:56:30.565395270 +0200
- @@ -382,14 +382,14 @@
- err = blkcipher_walk_virt(desc, &walk);
- desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
-
- - kernel_fpu_begin();
- while ((nbytes = walk.nbytes)) {
- + kernel_fpu_begin();
- aesni_ecb_enc(ctx, walk.dst.virt.addr, walk.src.virt.addr,
- - nbytes & AES_BLOCK_MASK);
- + nbytes & AES_BLOCK_MASK);
- + kernel_fpu_end();
- nbytes &= AES_BLOCK_SIZE - 1;
- err = blkcipher_walk_done(desc, &walk, nbytes);
- }
- - kernel_fpu_end();
-
- return err;
- }
- @@ -406,14 +406,14 @@
- err = blkcipher_walk_virt(desc, &walk);
- desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
-
- - kernel_fpu_begin();
- while ((nbytes = walk.nbytes)) {
- + kernel_fpu_begin();
- aesni_ecb_dec(ctx, walk.dst.virt.addr, walk.src.virt.addr,
- nbytes & AES_BLOCK_MASK);
- + kernel_fpu_end();
- nbytes &= AES_BLOCK_SIZE - 1;
- err = blkcipher_walk_done(desc, &walk, nbytes);
- }
- - kernel_fpu_end();
-
- return err;
- }
- @@ -430,14 +430,14 @@
- err = blkcipher_walk_virt(desc, &walk);
- desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
-
- - kernel_fpu_begin();
- while ((nbytes = walk.nbytes)) {
- + kernel_fpu_begin();
- aesni_cbc_enc(ctx, walk.dst.virt.addr, walk.src.virt.addr,
- nbytes & AES_BLOCK_MASK, walk.iv);
- + kernel_fpu_end();
- nbytes &= AES_BLOCK_SIZE - 1;
- err = blkcipher_walk_done(desc, &walk, nbytes);
- }
- - kernel_fpu_end();
-
- return err;
- }
- @@ -454,14 +454,14 @@
- err = blkcipher_walk_virt(desc, &walk);
- desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
-
- - kernel_fpu_begin();
- while ((nbytes = walk.nbytes)) {
- + kernel_fpu_begin();
- aesni_cbc_dec(ctx, walk.dst.virt.addr, walk.src.virt.addr,
- nbytes & AES_BLOCK_MASK, walk.iv);
- + kernel_fpu_end();
- nbytes &= AES_BLOCK_SIZE - 1;
- err = blkcipher_walk_done(desc, &walk, nbytes);
- }
- - kernel_fpu_end();
-
- return err;
- }
- @@ -513,18 +513,20 @@
- err = blkcipher_walk_virt_block(desc, &walk, AES_BLOCK_SIZE);
- desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
-
- - kernel_fpu_begin();
- while ((nbytes = walk.nbytes) >= AES_BLOCK_SIZE) {
- + kernel_fpu_begin();
- aesni_ctr_enc_tfm(ctx, walk.dst.virt.addr, walk.src.virt.addr,
- nbytes & AES_BLOCK_MASK, walk.iv);
- + kernel_fpu_end();
- nbytes &= AES_BLOCK_SIZE - 1;
- err = blkcipher_walk_done(desc, &walk, nbytes);
- }
- if (walk.nbytes) {
- + kernel_fpu_begin();
- ctr_crypt_final(ctx, &walk);
- + kernel_fpu_end();
- err = blkcipher_walk_done(desc, &walk, 0);
- }
- - kernel_fpu_end();
-
- return err;
- }
- diff -Nur linux-4.1.39.orig/arch/x86/crypto/cast5_avx_glue.c linux-4.1.39/arch/x86/crypto/cast5_avx_glue.c
- --- linux-4.1.39.orig/arch/x86/crypto/cast5_avx_glue.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/x86/crypto/cast5_avx_glue.c 2017-04-18 17:56:30.565395270 +0200
- @@ -60,7 +60,7 @@
- static int ecb_crypt(struct blkcipher_desc *desc, struct blkcipher_walk *walk,
- bool enc)
- {
- - bool fpu_enabled = false;
- + bool fpu_enabled;
- struct cast5_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
- const unsigned int bsize = CAST5_BLOCK_SIZE;
- unsigned int nbytes;
- @@ -76,7 +76,7 @@
- u8 *wsrc = walk->src.virt.addr;
- u8 *wdst = walk->dst.virt.addr;
-
- - fpu_enabled = cast5_fpu_begin(fpu_enabled, nbytes);
- + fpu_enabled = cast5_fpu_begin(false, nbytes);
-
- /* Process multi-block batch */
- if (nbytes >= bsize * CAST5_PARALLEL_BLOCKS) {
- @@ -104,10 +104,9 @@
- } while (nbytes >= bsize);
-
- done:
- + cast5_fpu_end(fpu_enabled);
- err = blkcipher_walk_done(desc, walk, nbytes);
- }
- -
- - cast5_fpu_end(fpu_enabled);
- return err;
- }
-
- @@ -228,7 +227,7 @@
- static int cbc_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
- struct scatterlist *src, unsigned int nbytes)
- {
- - bool fpu_enabled = false;
- + bool fpu_enabled;
- struct blkcipher_walk walk;
- int err;
-
- @@ -237,12 +236,11 @@
- desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
-
- while ((nbytes = walk.nbytes)) {
- - fpu_enabled = cast5_fpu_begin(fpu_enabled, nbytes);
- + fpu_enabled = cast5_fpu_begin(false, nbytes);
- nbytes = __cbc_decrypt(desc, &walk);
- + cast5_fpu_end(fpu_enabled);
- err = blkcipher_walk_done(desc, &walk, nbytes);
- }
- -
- - cast5_fpu_end(fpu_enabled);
- return err;
- }
-
- @@ -312,7 +310,7 @@
- static int ctr_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
- struct scatterlist *src, unsigned int nbytes)
- {
- - bool fpu_enabled = false;
- + bool fpu_enabled;
- struct blkcipher_walk walk;
- int err;
-
- @@ -321,13 +319,12 @@
- desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
-
- while ((nbytes = walk.nbytes) >= CAST5_BLOCK_SIZE) {
- - fpu_enabled = cast5_fpu_begin(fpu_enabled, nbytes);
- + fpu_enabled = cast5_fpu_begin(false, nbytes);
- nbytes = __ctr_crypt(desc, &walk);
- + cast5_fpu_end(fpu_enabled);
- err = blkcipher_walk_done(desc, &walk, nbytes);
- }
-
- - cast5_fpu_end(fpu_enabled);
- -
- if (walk.nbytes) {
- ctr_crypt_final(desc, &walk);
- err = blkcipher_walk_done(desc, &walk, 0);
- diff -Nur linux-4.1.39.orig/arch/x86/crypto/glue_helper.c linux-4.1.39/arch/x86/crypto/glue_helper.c
- --- linux-4.1.39.orig/arch/x86/crypto/glue_helper.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/x86/crypto/glue_helper.c 2017-04-18 17:56:30.565395270 +0200
- @@ -39,7 +39,7 @@
- void *ctx = crypto_blkcipher_ctx(desc->tfm);
- const unsigned int bsize = 128 / 8;
- unsigned int nbytes, i, func_bytes;
- - bool fpu_enabled = false;
- + bool fpu_enabled;
- int err;
-
- err = blkcipher_walk_virt(desc, walk);
- @@ -49,7 +49,7 @@
- u8 *wdst = walk->dst.virt.addr;
-
- fpu_enabled = glue_fpu_begin(bsize, gctx->fpu_blocks_limit,
- - desc, fpu_enabled, nbytes);
- + desc, false, nbytes);
-
- for (i = 0; i < gctx->num_funcs; i++) {
- func_bytes = bsize * gctx->funcs[i].num_blocks;
- @@ -71,10 +71,10 @@
- }
-
- done:
- + glue_fpu_end(fpu_enabled);
- err = blkcipher_walk_done(desc, walk, nbytes);
- }
-
- - glue_fpu_end(fpu_enabled);
- return err;
- }
-
- @@ -194,7 +194,7 @@
- struct scatterlist *src, unsigned int nbytes)
- {
- const unsigned int bsize = 128 / 8;
- - bool fpu_enabled = false;
- + bool fpu_enabled;
- struct blkcipher_walk walk;
- int err;
-
- @@ -203,12 +203,12 @@
-
- while ((nbytes = walk.nbytes)) {
- fpu_enabled = glue_fpu_begin(bsize, gctx->fpu_blocks_limit,
- - desc, fpu_enabled, nbytes);
- + desc, false, nbytes);
- nbytes = __glue_cbc_decrypt_128bit(gctx, desc, &walk);
- + glue_fpu_end(fpu_enabled);
- err = blkcipher_walk_done(desc, &walk, nbytes);
- }
-
- - glue_fpu_end(fpu_enabled);
- return err;
- }
- EXPORT_SYMBOL_GPL(glue_cbc_decrypt_128bit);
- @@ -277,7 +277,7 @@
- struct scatterlist *src, unsigned int nbytes)
- {
- const unsigned int bsize = 128 / 8;
- - bool fpu_enabled = false;
- + bool fpu_enabled;
- struct blkcipher_walk walk;
- int err;
-
- @@ -286,13 +286,12 @@
-
- while ((nbytes = walk.nbytes) >= bsize) {
- fpu_enabled = glue_fpu_begin(bsize, gctx->fpu_blocks_limit,
- - desc, fpu_enabled, nbytes);
- + desc, false, nbytes);
- nbytes = __glue_ctr_crypt_128bit(gctx, desc, &walk);
- + glue_fpu_end(fpu_enabled);
- err = blkcipher_walk_done(desc, &walk, nbytes);
- }
-
- - glue_fpu_end(fpu_enabled);
- -
- if (walk.nbytes) {
- glue_ctr_crypt_final_128bit(
- gctx->funcs[gctx->num_funcs - 1].fn_u.ctr, desc, &walk);
- @@ -347,7 +346,7 @@
- void *tweak_ctx, void *crypt_ctx)
- {
- const unsigned int bsize = 128 / 8;
- - bool fpu_enabled = false;
- + bool fpu_enabled;
- struct blkcipher_walk walk;
- int err;
-
- @@ -360,21 +359,21 @@
-
- /* set minimum length to bsize, for tweak_fn */
- fpu_enabled = glue_fpu_begin(bsize, gctx->fpu_blocks_limit,
- - desc, fpu_enabled,
- + desc, false,
- nbytes < bsize ? bsize : nbytes);
- -
- /* calculate first value of T */
- tweak_fn(tweak_ctx, walk.iv, walk.iv);
- + glue_fpu_end(fpu_enabled);
-
- while (nbytes) {
- + fpu_enabled = glue_fpu_begin(bsize, gctx->fpu_blocks_limit,
- + desc, false, nbytes);
- nbytes = __glue_xts_crypt_128bit(gctx, crypt_ctx, desc, &walk);
-
- + glue_fpu_end(fpu_enabled);
- err = blkcipher_walk_done(desc, &walk, nbytes);
- nbytes = walk.nbytes;
- }
- -
- - glue_fpu_end(fpu_enabled);
- -
- return err;
- }
- EXPORT_SYMBOL_GPL(glue_xts_crypt_128bit);
- diff -Nur linux-4.1.39.orig/arch/x86/include/asm/preempt.h linux-4.1.39/arch/x86/include/asm/preempt.h
- --- linux-4.1.39.orig/arch/x86/include/asm/preempt.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/x86/include/asm/preempt.h 2017-04-18 17:56:30.565395270 +0200
- @@ -82,17 +82,46 @@
- * a decrement which hits zero means we have no preempt_count and should
- * reschedule.
- */
- -static __always_inline bool __preempt_count_dec_and_test(void)
- +static __always_inline bool ____preempt_count_dec_and_test(void)
- {
- GEN_UNARY_RMWcc("decl", __preempt_count, __percpu_arg(0), "e");
- }
-
- +static __always_inline bool __preempt_count_dec_and_test(void)
- +{
- + if (____preempt_count_dec_and_test())
- + return true;
- +#ifdef CONFIG_PREEMPT_LAZY
- + if (current_thread_info()->preempt_lazy_count)
- + return false;
- + return test_thread_flag(TIF_NEED_RESCHED_LAZY);
- +#else
- + return false;
- +#endif
- +}
- +
- /*
- * Returns true when we need to resched and can (barring IRQ state).
- */
- static __always_inline bool should_resched(int preempt_offset)
- {
- +#ifdef CONFIG_PREEMPT_LAZY
- + u32 tmp;
- +
- + tmp = raw_cpu_read_4(__preempt_count);
- + if (tmp == preempt_offset)
- + return true;
- +
- + /* preempt count == 0 ? */
- + tmp &= ~PREEMPT_NEED_RESCHED;
- + if (tmp)
- + return false;
- + if (current_thread_info()->preempt_lazy_count)
- + return false;
- + return test_thread_flag(TIF_NEED_RESCHED_LAZY);
- +#else
- return unlikely(raw_cpu_read_4(__preempt_count) == preempt_offset);
- +#endif
- }
-
- #ifdef CONFIG_PREEMPT
- diff -Nur linux-4.1.39.orig/arch/x86/include/asm/signal.h linux-4.1.39/arch/x86/include/asm/signal.h
- --- linux-4.1.39.orig/arch/x86/include/asm/signal.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/x86/include/asm/signal.h 2017-04-18 17:56:30.565395270 +0200
- @@ -23,6 +23,19 @@
- unsigned long sig[_NSIG_WORDS];
- } sigset_t;
-
- +/*
- + * Because some traps use the IST stack, we must keep preemption
- + * disabled while calling do_trap(), but do_trap() may call
- + * force_sig_info() which will grab the signal spin_locks for the
- + * task, which in PREEMPT_RT_FULL are mutexes. By defining
- + * ARCH_RT_DELAYS_SIGNAL_SEND the force_sig_info() will set
- + * TIF_NOTIFY_RESUME and set up the signal to be sent on exit of the
- + * trap.
- + */
- +#if defined(CONFIG_PREEMPT_RT_FULL)
- +#define ARCH_RT_DELAYS_SIGNAL_SEND
- +#endif
- +
- #ifndef CONFIG_COMPAT
- typedef sigset_t compat_sigset_t;
- #endif
- diff -Nur linux-4.1.39.orig/arch/x86/include/asm/stackprotector.h linux-4.1.39/arch/x86/include/asm/stackprotector.h
- --- linux-4.1.39.orig/arch/x86/include/asm/stackprotector.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/x86/include/asm/stackprotector.h 2017-04-18 17:56:30.565395270 +0200
- @@ -57,7 +57,7 @@
- */
- static __always_inline void boot_init_stack_canary(void)
- {
- - u64 canary;
- + u64 uninitialized_var(canary);
- u64 tsc;
-
- #ifdef CONFIG_X86_64
- @@ -68,8 +68,16 @@
- * of randomness. The TSC only matters for very early init,
- * there it already has some randomness on most systems. Later
- * on during the bootup the random pool has true entropy too.
- + *
- + * For preempt-rt we need to weaken the randomness a bit, as
- + * we can't call into the random generator from atomic context
- + * due to locking constraints. We just leave canary
- + * uninitialized and use the TSC based randomness on top of
- + * it.
- */
- +#ifndef CONFIG_PREEMPT_RT_FULL
- get_random_bytes(&canary, sizeof(canary));
- +#endif
- tsc = __native_read_tsc();
- canary += tsc + (tsc << 32UL);
-
- diff -Nur linux-4.1.39.orig/arch/x86/include/asm/thread_info.h linux-4.1.39/arch/x86/include/asm/thread_info.h
- --- linux-4.1.39.orig/arch/x86/include/asm/thread_info.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/x86/include/asm/thread_info.h 2017-04-18 17:56:30.565395270 +0200
- @@ -55,6 +55,8 @@
- __u32 status; /* thread synchronous flags */
- __u32 cpu; /* current CPU */
- int saved_preempt_count;
- + int preempt_lazy_count; /* 0 => lazy preemptable
- + <0 => BUG */
- mm_segment_t addr_limit;
- void __user *sysenter_return;
- unsigned int sig_on_uaccess_error:1;
- @@ -95,6 +97,7 @@
- #define TIF_SYSCALL_EMU 6 /* syscall emulation active */
- #define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */
- #define TIF_SECCOMP 8 /* secure computing */
- +#define TIF_NEED_RESCHED_LAZY 9 /* lazy rescheduling necessary */
- #define TIF_USER_RETURN_NOTIFY 11 /* notify kernel of userspace return */
- #define TIF_UPROBE 12 /* breakpointed or singlestepping */
- #define TIF_NOTSC 16 /* TSC is not accessible in userland */
- @@ -119,6 +122,7 @@
- #define _TIF_SYSCALL_EMU (1 << TIF_SYSCALL_EMU)
- #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
- #define _TIF_SECCOMP (1 << TIF_SECCOMP)
- +#define _TIF_NEED_RESCHED_LAZY (1 << TIF_NEED_RESCHED_LAZY)
- #define _TIF_USER_RETURN_NOTIFY (1 << TIF_USER_RETURN_NOTIFY)
- #define _TIF_UPROBE (1 << TIF_UPROBE)
- #define _TIF_NOTSC (1 << TIF_NOTSC)
- @@ -168,6 +172,8 @@
- #define _TIF_WORK_CTXSW_PREV (_TIF_WORK_CTXSW|_TIF_USER_RETURN_NOTIFY)
- #define _TIF_WORK_CTXSW_NEXT (_TIF_WORK_CTXSW)
-
- +#define _TIF_NEED_RESCHED_MASK (_TIF_NEED_RESCHED | _TIF_NEED_RESCHED_LAZY)
- +
- #define STACK_WARN (THREAD_SIZE/8)
-
- /*
- diff -Nur linux-4.1.39.orig/arch/x86/include/asm/uaccess_32.h linux-4.1.39/arch/x86/include/asm/uaccess_32.h
- --- linux-4.1.39.orig/arch/x86/include/asm/uaccess_32.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/x86/include/asm/uaccess_32.h 2017-04-18 17:56:30.565395270 +0200
- @@ -70,7 +70,8 @@
- * @from: Source address, in kernel space.
- * @n: Number of bytes to copy.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * Copy data from kernel space to user space. Caller must check
- * the specified block with access_ok() before calling this function.
- @@ -117,7 +118,8 @@
- * @from: Source address, in user space.
- * @n: Number of bytes to copy.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * Copy data from user space to kernel space. Caller must check
- * the specified block with access_ok() before calling this function.
- diff -Nur linux-4.1.39.orig/arch/x86/include/asm/uaccess.h linux-4.1.39/arch/x86/include/asm/uaccess.h
- --- linux-4.1.39.orig/arch/x86/include/asm/uaccess.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/x86/include/asm/uaccess.h 2017-04-18 17:56:30.565395270 +0200
- @@ -74,7 +74,8 @@
- * @addr: User space pointer to start of block to check
- * @size: Size of block to check
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * Checks if a pointer to a block of memory in user space is valid.
- *
- @@ -145,7 +146,8 @@
- * @x: Variable to store result.
- * @ptr: Source address, in user space.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * This macro copies a single simple variable from user space to kernel
- * space. It supports simple types like char and int, but not larger
- @@ -240,7 +242,8 @@
- * @x: Value to copy to user space.
- * @ptr: Destination address, in user space.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * This macro copies a single simple value from kernel space to user
- * space. It supports simple types like char and int, but not larger
- @@ -459,7 +462,8 @@
- * @x: Variable to store result.
- * @ptr: Source address, in user space.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * This macro copies a single simple variable from user space to kernel
- * space. It supports simple types like char and int, but not larger
- @@ -483,7 +487,8 @@
- * @x: Value to copy to user space.
- * @ptr: Destination address, in user space.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * This macro copies a single simple value from kernel space to user
- * space. It supports simple types like char and int, but not larger
- diff -Nur linux-4.1.39.orig/arch/x86/include/asm/uv/uv_bau.h linux-4.1.39/arch/x86/include/asm/uv/uv_bau.h
- --- linux-4.1.39.orig/arch/x86/include/asm/uv/uv_bau.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/x86/include/asm/uv/uv_bau.h 2017-04-18 17:56:30.565395270 +0200
- @@ -615,9 +615,9 @@
- cycles_t send_message;
- cycles_t period_end;
- cycles_t period_time;
- - spinlock_t uvhub_lock;
- - spinlock_t queue_lock;
- - spinlock_t disable_lock;
- + raw_spinlock_t uvhub_lock;
- + raw_spinlock_t queue_lock;
- + raw_spinlock_t disable_lock;
- /* tunables */
- int max_concurr;
- int max_concurr_const;
- @@ -776,15 +776,15 @@
- * to be lowered below the current 'v'. atomic_add_unless can only stop
- * on equal.
- */
- -static inline int atomic_inc_unless_ge(spinlock_t *lock, atomic_t *v, int u)
- +static inline int atomic_inc_unless_ge(raw_spinlock_t *lock, atomic_t *v, int u)
- {
- - spin_lock(lock);
- + raw_spin_lock(lock);
- if (atomic_read(v) >= u) {
- - spin_unlock(lock);
- + raw_spin_unlock(lock);
- return 0;
- }
- atomic_inc(v);
- - spin_unlock(lock);
- + raw_spin_unlock(lock);
- return 1;
- }
-
- diff -Nur linux-4.1.39.orig/arch/x86/include/asm/uv/uv_hub.h linux-4.1.39/arch/x86/include/asm/uv/uv_hub.h
- --- linux-4.1.39.orig/arch/x86/include/asm/uv/uv_hub.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/x86/include/asm/uv/uv_hub.h 2017-04-18 17:56:30.565395270 +0200
- @@ -492,7 +492,7 @@
- unsigned short nr_online_cpus;
- unsigned short pnode;
- short memory_nid;
- - spinlock_t nmi_lock; /* obsolete, see uv_hub_nmi */
- + raw_spinlock_t nmi_lock; /* obsolete, see uv_hub_nmi */
- unsigned long nmi_count; /* obsolete, see uv_hub_nmi */
- };
- extern struct uv_blade_info *uv_blade_info;
- diff -Nur linux-4.1.39.orig/arch/x86/Kconfig linux-4.1.39/arch/x86/Kconfig
- --- linux-4.1.39.orig/arch/x86/Kconfig 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/x86/Kconfig 2017-04-18 17:56:30.565395270 +0200
- @@ -22,6 +22,7 @@
- ### Arch settings
- config X86
- def_bool y
- + select HAVE_PREEMPT_LAZY
- select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI
- select ARCH_MIGHT_HAVE_ACPI_PDC if ACPI
- select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
- @@ -203,8 +204,11 @@
- def_bool y
- depends on ISA_DMA_API
-
- +config RWSEM_GENERIC_SPINLOCK
- + def_bool PREEMPT_RT_FULL
- +
- config RWSEM_XCHGADD_ALGORITHM
- - def_bool y
- + def_bool !RWSEM_GENERIC_SPINLOCK && !PREEMPT_RT_FULL
-
- config GENERIC_CALIBRATE_DELAY
- def_bool y
- @@ -838,7 +842,7 @@
- config MAXSMP
- bool "Enable Maximum number of SMP Processors and NUMA Nodes"
- depends on X86_64 && SMP && DEBUG_KERNEL
- - select CPUMASK_OFFSTACK
- + select CPUMASK_OFFSTACK if !PREEMPT_RT_FULL
- ---help---
- Enable maximum number of CPUS and NUMA Nodes for this architecture.
- If unsure, say N.
- diff -Nur linux-4.1.39.orig/arch/x86/kernel/acpi/boot.c linux-4.1.39/arch/x86/kernel/acpi/boot.c
- --- linux-4.1.39.orig/arch/x86/kernel/acpi/boot.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/x86/kernel/acpi/boot.c 2017-04-18 17:56:30.565395270 +0200
- @@ -87,7 +87,9 @@
- * ->ioapic_mutex
- * ->ioapic_lock
- */
- +#ifdef CONFIG_X86_IO_APIC
- static DEFINE_MUTEX(acpi_ioapic_lock);
- +#endif
-
- /* --------------------------------------------------------------------------
- Boot-time Configuration
- diff -Nur linux-4.1.39.orig/arch/x86/kernel/apic/io_apic.c linux-4.1.39/arch/x86/kernel/apic/io_apic.c
- --- linux-4.1.39.orig/arch/x86/kernel/apic/io_apic.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/x86/kernel/apic/io_apic.c 2017-04-18 17:56:30.565395270 +0200
- @@ -1891,7 +1891,8 @@
- static inline bool ioapic_irqd_mask(struct irq_data *data, struct irq_cfg *cfg)
- {
- /* If we are moving the irq we need to mask it */
- - if (unlikely(irqd_is_setaffinity_pending(data))) {
- + if (unlikely(irqd_is_setaffinity_pending(data) &&
- + !irqd_irq_inprogress(data))) {
- mask_ioapic(cfg);
- return true;
- }
- diff -Nur linux-4.1.39.orig/arch/x86/kernel/apic/x2apic_uv_x.c linux-4.1.39/arch/x86/kernel/apic/x2apic_uv_x.c
- --- linux-4.1.39.orig/arch/x86/kernel/apic/x2apic_uv_x.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/x86/kernel/apic/x2apic_uv_x.c 2017-04-18 17:56:30.569395424 +0200
- @@ -949,7 +949,7 @@
- uv_blade_info[blade].pnode = pnode;
- uv_blade_info[blade].nr_possible_cpus = 0;
- uv_blade_info[blade].nr_online_cpus = 0;
- - spin_lock_init(&uv_blade_info[blade].nmi_lock);
- + raw_spin_lock_init(&uv_blade_info[blade].nmi_lock);
- min_pnode = min(pnode, min_pnode);
- max_pnode = max(pnode, max_pnode);
- blade++;
- diff -Nur linux-4.1.39.orig/arch/x86/kernel/asm-offsets.c linux-4.1.39/arch/x86/kernel/asm-offsets.c
- --- linux-4.1.39.orig/arch/x86/kernel/asm-offsets.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/x86/kernel/asm-offsets.c 2017-04-18 17:56:30.569395424 +0200
- @@ -32,6 +32,7 @@
- OFFSET(TI_flags, thread_info, flags);
- OFFSET(TI_status, thread_info, status);
- OFFSET(TI_addr_limit, thread_info, addr_limit);
- + OFFSET(TI_preempt_lazy_count, thread_info, preempt_lazy_count);
-
- BLANK();
- OFFSET(crypto_tfm_ctx_offset, crypto_tfm, __crt_ctx);
- @@ -71,4 +72,5 @@
-
- BLANK();
- DEFINE(PTREGS_SIZE, sizeof(struct pt_regs));
- + DEFINE(_PREEMPT_ENABLED, PREEMPT_ENABLED);
- }
- diff -Nur linux-4.1.39.orig/arch/x86/kernel/cpu/mcheck/mce.c linux-4.1.39/arch/x86/kernel/cpu/mcheck/mce.c
- --- linux-4.1.39.orig/arch/x86/kernel/cpu/mcheck/mce.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/x86/kernel/cpu/mcheck/mce.c 2017-04-18 17:56:30.569395424 +0200
- @@ -41,6 +41,8 @@
- #include <linux/debugfs.h>
- #include <linux/irq_work.h>
- #include <linux/export.h>
- +#include <linux/jiffies.h>
- +#include <linux/work-simple.h>
-
- #include <asm/processor.h>
- #include <asm/traps.h>
- @@ -1267,7 +1269,7 @@
- static unsigned long check_interval = INITIAL_CHECK_INTERVAL;
-
- static DEFINE_PER_CPU(unsigned long, mce_next_interval); /* in jiffies */
- -static DEFINE_PER_CPU(struct timer_list, mce_timer);
- +static DEFINE_PER_CPU(struct hrtimer, mce_timer);
-
- static unsigned long mce_adjust_timer_default(unsigned long interval)
- {
- @@ -1276,32 +1278,18 @@
-
- static unsigned long (*mce_adjust_timer)(unsigned long interval) = mce_adjust_timer_default;
-
- -static void __restart_timer(struct timer_list *t, unsigned long interval)
- +static enum hrtimer_restart __restart_timer(struct hrtimer *timer, unsigned long interval)
- {
- - unsigned long when = jiffies + interval;
- - unsigned long flags;
- -
- - local_irq_save(flags);
- -
- - if (timer_pending(t)) {
- - if (time_before(when, t->expires))
- - mod_timer_pinned(t, when);
- - } else {
- - t->expires = round_jiffies(when);
- - add_timer_on(t, smp_processor_id());
- - }
- -
- - local_irq_restore(flags);
- + if (!interval)
- + return HRTIMER_NORESTART;
- + hrtimer_forward_now(timer, ns_to_ktime(jiffies_to_nsecs(interval)));
- + return HRTIMER_RESTART;
- }
-
- -static void mce_timer_fn(unsigned long data)
- +static enum hrtimer_restart mce_timer_fn(struct hrtimer *timer)
- {
- - struct timer_list *t = this_cpu_ptr(&mce_timer);
- - int cpu = smp_processor_id();
- unsigned long iv;
-
- - WARN_ON(cpu != data);
- -
- iv = __this_cpu_read(mce_next_interval);
-
- if (mce_available(this_cpu_ptr(&cpu_info))) {
- @@ -1324,7 +1312,7 @@
-
- done:
- __this_cpu_write(mce_next_interval, iv);
- - __restart_timer(t, iv);
- + return __restart_timer(timer, iv);
- }
-
- /*
- @@ -1332,7 +1320,7 @@
- */
- void mce_timer_kick(unsigned long interval)
- {
- - struct timer_list *t = this_cpu_ptr(&mce_timer);
- + struct hrtimer *t = this_cpu_ptr(&mce_timer);
- unsigned long iv = __this_cpu_read(mce_next_interval);
-
- __restart_timer(t, interval);
- @@ -1347,7 +1335,7 @@
- int cpu;
-
- for_each_online_cpu(cpu)
- - del_timer_sync(&per_cpu(mce_timer, cpu));
- + hrtimer_cancel(&per_cpu(mce_timer, cpu));
- }
-
- static void mce_do_trigger(struct work_struct *work)
- @@ -1357,6 +1345,56 @@
-
- static DECLARE_WORK(mce_trigger_work, mce_do_trigger);
-
- +static void __mce_notify_work(struct swork_event *event)
- +{
- + /* Not more than two messages every minute */
- + static DEFINE_RATELIMIT_STATE(ratelimit, 60*HZ, 2);
- +
- + /* wake processes polling /dev/mcelog */
- + wake_up_interruptible(&mce_chrdev_wait);
- +
- + /*
- + * There is no risk of missing notifications because
- + * work_pending is always cleared before the function is
- + * executed.
- + */
- + if (mce_helper[0] && !work_pending(&mce_trigger_work))
- + schedule_work(&mce_trigger_work);
- +
- + if (__ratelimit(&ratelimit))
- + pr_info(HW_ERR "Machine check events logged\n");
- +}
- +
- +#ifdef CONFIG_PREEMPT_RT_FULL
- +static bool notify_work_ready __read_mostly;
- +static struct swork_event notify_work;
- +
- +static int mce_notify_work_init(void)
- +{
- + int err;
- +
- + err = swork_get();
- + if (err)
- + return err;
- +
- + INIT_SWORK(¬ify_work, __mce_notify_work);
- + notify_work_ready = true;
- + return 0;
- +}
- +
- +static void mce_notify_work(void)
- +{
- + if (notify_work_ready)
- + swork_queue(¬ify_work);
- +}
- +#else
- +static void mce_notify_work(void)
- +{
- + __mce_notify_work(NULL);
- +}
- +static inline int mce_notify_work_init(void) { return 0; }
- +#endif
- +
- /*
- * Notify the user(s) about new machine check events.
- * Can be called from interrupt context, but not from machine check/NMI
- @@ -1364,19 +1402,8 @@
- */
- int mce_notify_irq(void)
- {
- - /* Not more than two messages every minute */
- - static DEFINE_RATELIMIT_STATE(ratelimit, 60*HZ, 2);
- -
- if (test_and_clear_bit(0, &mce_need_notify)) {
- - /* wake processes polling /dev/mcelog */
- - wake_up_interruptible(&mce_chrdev_wait);
- -
- - if (mce_helper[0])
- - schedule_work(&mce_trigger_work);
- -
- - if (__ratelimit(&ratelimit))
- - pr_info(HW_ERR "Machine check events logged\n");
- -
- + mce_notify_work();
- return 1;
- }
- return 0;
- @@ -1649,7 +1676,7 @@
- }
- }
-
- -static void mce_start_timer(unsigned int cpu, struct timer_list *t)
- +static void mce_start_timer(unsigned int cpu, struct hrtimer *t)
- {
- unsigned long iv = check_interval * HZ;
-
- @@ -1658,16 +1685,17 @@
-
- per_cpu(mce_next_interval, cpu) = iv;
-
- - t->expires = round_jiffies(jiffies + iv);
- - add_timer_on(t, cpu);
- + hrtimer_start_range_ns(t, ns_to_ktime(jiffies_to_usecs(iv) * 1000ULL),
- + 0, HRTIMER_MODE_REL_PINNED);
- }
-
- static void __mcheck_cpu_init_timer(void)
- {
- - struct timer_list *t = this_cpu_ptr(&mce_timer);
- + struct hrtimer *t = this_cpu_ptr(&mce_timer);
- unsigned int cpu = smp_processor_id();
-
- - setup_timer(t, mce_timer_fn, cpu);
- + hrtimer_init(t, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
- + t->function = mce_timer_fn;
- mce_start_timer(cpu, t);
- }
-
- @@ -2345,6 +2373,8 @@
- if (!mce_available(raw_cpu_ptr(&cpu_info)))
- return;
-
- + hrtimer_cancel(this_cpu_ptr(&mce_timer));
- +
- if (!(action & CPU_TASKS_FROZEN))
- cmci_clear();
- for (i = 0; i < mca_cfg.banks; i++) {
- @@ -2371,6 +2401,7 @@
- if (b->init)
- wrmsrl(MSR_IA32_MCx_CTL(i), b->ctl);
- }
- + __mcheck_cpu_init_timer();
- }
-
- /* Get notified when a cpu comes on/off. Be hotplug friendly. */
- @@ -2378,7 +2409,6 @@
- mce_cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu)
- {
- unsigned int cpu = (unsigned long)hcpu;
- - struct timer_list *t = &per_cpu(mce_timer, cpu);
-
- switch (action & ~CPU_TASKS_FROZEN) {
- case CPU_ONLINE:
- @@ -2398,11 +2428,9 @@
- break;
- case CPU_DOWN_PREPARE:
- smp_call_function_single(cpu, mce_disable_cpu, &action, 1);
- - del_timer_sync(t);
- break;
- case CPU_DOWN_FAILED:
- smp_call_function_single(cpu, mce_reenable_cpu, &action, 1);
- - mce_start_timer(cpu, t);
- break;
- }
-
- @@ -2441,6 +2469,10 @@
- goto err_out;
- }
-
- + err = mce_notify_work_init();
- + if (err)
- + goto err_out;
- +
- if (!zalloc_cpumask_var(&mce_device_initialized, GFP_KERNEL)) {
- err = -ENOMEM;
- goto err_out;
- diff -Nur linux-4.1.39.orig/arch/x86/kernel/cpu/perf_event_intel_rapl.c linux-4.1.39/arch/x86/kernel/cpu/perf_event_intel_rapl.c
- --- linux-4.1.39.orig/arch/x86/kernel/cpu/perf_event_intel_rapl.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/x86/kernel/cpu/perf_event_intel_rapl.c 2017-04-18 17:56:30.569395424 +0200
- @@ -119,7 +119,7 @@
- };
-
- struct rapl_pmu {
- - spinlock_t lock;
- + raw_spinlock_t lock;
- int n_active; /* number of active events */
- struct list_head active_list;
- struct pmu *pmu; /* pointer to rapl_pmu_class */
- @@ -223,13 +223,13 @@
- if (!pmu->n_active)
- return HRTIMER_NORESTART;
-
- - spin_lock_irqsave(&pmu->lock, flags);
- + raw_spin_lock_irqsave(&pmu->lock, flags);
-
- list_for_each_entry(event, &pmu->active_list, active_entry) {
- rapl_event_update(event);
- }
-
- - spin_unlock_irqrestore(&pmu->lock, flags);
- + raw_spin_unlock_irqrestore(&pmu->lock, flags);
-
- hrtimer_forward_now(hrtimer, pmu->timer_interval);
-
- @@ -266,9 +266,9 @@
- struct rapl_pmu *pmu = __this_cpu_read(rapl_pmu);
- unsigned long flags;
-
- - spin_lock_irqsave(&pmu->lock, flags);
- + raw_spin_lock_irqsave(&pmu->lock, flags);
- __rapl_pmu_event_start(pmu, event);
- - spin_unlock_irqrestore(&pmu->lock, flags);
- + raw_spin_unlock_irqrestore(&pmu->lock, flags);
- }
-
- static void rapl_pmu_event_stop(struct perf_event *event, int mode)
- @@ -277,7 +277,7 @@
- struct hw_perf_event *hwc = &event->hw;
- unsigned long flags;
-
- - spin_lock_irqsave(&pmu->lock, flags);
- + raw_spin_lock_irqsave(&pmu->lock, flags);
-
- /* mark event as deactivated and stopped */
- if (!(hwc->state & PERF_HES_STOPPED)) {
- @@ -302,7 +302,7 @@
- hwc->state |= PERF_HES_UPTODATE;
- }
-
- - spin_unlock_irqrestore(&pmu->lock, flags);
- + raw_spin_unlock_irqrestore(&pmu->lock, flags);
- }
-
- static int rapl_pmu_event_add(struct perf_event *event, int mode)
- @@ -311,14 +311,14 @@
- struct hw_perf_event *hwc = &event->hw;
- unsigned long flags;
-
- - spin_lock_irqsave(&pmu->lock, flags);
- + raw_spin_lock_irqsave(&pmu->lock, flags);
-
- hwc->state = PERF_HES_UPTODATE | PERF_HES_STOPPED;
-
- if (mode & PERF_EF_START)
- __rapl_pmu_event_start(pmu, event);
-
- - spin_unlock_irqrestore(&pmu->lock, flags);
- + raw_spin_unlock_irqrestore(&pmu->lock, flags);
-
- return 0;
- }
- @@ -594,7 +594,7 @@
- pmu = kzalloc_node(sizeof(*pmu), GFP_KERNEL, cpu_to_node(cpu));
- if (!pmu)
- return -1;
- - spin_lock_init(&pmu->lock);
- + raw_spin_lock_init(&pmu->lock);
-
- INIT_LIST_HEAD(&pmu->active_list);
-
- diff -Nur linux-4.1.39.orig/arch/x86/kernel/dumpstack_32.c linux-4.1.39/arch/x86/kernel/dumpstack_32.c
- --- linux-4.1.39.orig/arch/x86/kernel/dumpstack_32.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/x86/kernel/dumpstack_32.c 2017-04-18 17:56:30.569395424 +0200
- @@ -42,7 +42,7 @@
- unsigned long *stack, unsigned long bp,
- const struct stacktrace_ops *ops, void *data)
- {
- - const unsigned cpu = get_cpu();
- + const unsigned cpu = get_cpu_light();
- int graph = 0;
- u32 *prev_esp;
-
- @@ -86,7 +86,7 @@
- break;
- touch_nmi_watchdog();
- }
- - put_cpu();
- + put_cpu_light();
- }
- EXPORT_SYMBOL(dump_trace);
-
- diff -Nur linux-4.1.39.orig/arch/x86/kernel/dumpstack_64.c linux-4.1.39/arch/x86/kernel/dumpstack_64.c
- --- linux-4.1.39.orig/arch/x86/kernel/dumpstack_64.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/x86/kernel/dumpstack_64.c 2017-04-18 17:56:30.569395424 +0200
- @@ -152,7 +152,7 @@
- unsigned long *stack, unsigned long bp,
- const struct stacktrace_ops *ops, void *data)
- {
- - const unsigned cpu = get_cpu();
- + const unsigned cpu = get_cpu_light();
- struct thread_info *tinfo;
- unsigned long *irq_stack = (unsigned long *)per_cpu(irq_stack_ptr, cpu);
- unsigned long dummy;
- @@ -241,7 +241,7 @@
- * This handles the process stack:
- */
- bp = ops->walk_stack(tinfo, stack, bp, ops, data, NULL, &graph);
- - put_cpu();
- + put_cpu_light();
- }
- EXPORT_SYMBOL(dump_trace);
-
- @@ -255,7 +255,7 @@
- int cpu;
- int i;
-
- - preempt_disable();
- + migrate_disable();
- cpu = smp_processor_id();
-
- irq_stack_end = (unsigned long *)(per_cpu(irq_stack_ptr, cpu));
- @@ -291,7 +291,7 @@
- pr_cont(" %016lx", *stack++);
- touch_nmi_watchdog();
- }
- - preempt_enable();
- + migrate_enable();
-
- pr_cont("\n");
- show_trace_log_lvl(task, regs, sp, bp, log_lvl);
- diff -Nur linux-4.1.39.orig/arch/x86/kernel/entry_32.S linux-4.1.39/arch/x86/kernel/entry_32.S
- --- linux-4.1.39.orig/arch/x86/kernel/entry_32.S 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/x86/kernel/entry_32.S 2017-04-18 17:56:30.569395424 +0200
- @@ -359,8 +359,24 @@
- ENTRY(resume_kernel)
- DISABLE_INTERRUPTS(CLBR_ANY)
- need_resched:
- + # preempt count == 0 + NEED_RS set?
- cmpl $0,PER_CPU_VAR(__preempt_count)
- +#ifndef CONFIG_PREEMPT_LAZY
- jnz restore_all
- +#else
- + jz test_int_off
- +
- + # atleast preempt count == 0 ?
- + cmpl $_PREEMPT_ENABLED,PER_CPU_VAR(__preempt_count)
- + jne restore_all
- +
- + cmpl $0,TI_preempt_lazy_count(%ebp) # non-zero preempt_lazy_count ?
- + jnz restore_all
- +
- + testl $_TIF_NEED_RESCHED_LAZY, TI_flags(%ebp)
- + jz restore_all
- +test_int_off:
- +#endif
- testl $X86_EFLAGS_IF,PT_EFLAGS(%esp) # interrupts off (exception path) ?
- jz restore_all
- call preempt_schedule_irq
- @@ -594,7 +610,7 @@
- ALIGN
- RING0_PTREGS_FRAME # can't unwind into user space anyway
- work_pending:
- - testb $_TIF_NEED_RESCHED, %cl
- + testl $_TIF_NEED_RESCHED_MASK, %ecx
- jz work_notifysig
- work_resched:
- call schedule
- @@ -607,7 +623,7 @@
- andl $_TIF_WORK_MASK, %ecx # is there any work to be done other
- # than syscall tracing?
- jz restore_all
- - testb $_TIF_NEED_RESCHED, %cl
- + testl $_TIF_NEED_RESCHED_MASK, %ecx
- jnz work_resched
-
- work_notifysig: # deal with pending signals and
- diff -Nur linux-4.1.39.orig/arch/x86/kernel/entry_64.S linux-4.1.39/arch/x86/kernel/entry_64.S
- --- linux-4.1.39.orig/arch/x86/kernel/entry_64.S 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/x86/kernel/entry_64.S 2017-04-18 17:56:30.569395424 +0200
- @@ -370,8 +370,8 @@
- /* First do a reschedule test. */
- /* edx: work, edi: workmask */
- int_careful:
- - bt $TIF_NEED_RESCHED,%edx
- - jnc int_very_careful
- + testl $_TIF_NEED_RESCHED_MASK,%edx
- + jz int_very_careful
- TRACE_IRQS_ON
- ENABLE_INTERRUPTS(CLBR_NONE)
- pushq_cfi %rdi
- @@ -776,7 +776,23 @@
- bt $9,EFLAGS(%rsp) /* interrupts were off? */
- jnc 1f
- 0: cmpl $0,PER_CPU_VAR(__preempt_count)
- +#ifndef CONFIG_PREEMPT_LAZY
- jnz 1f
- +#else
- + jz do_preempt_schedule_irq
- +
- + # atleast preempt count == 0 ?
- + cmpl $_PREEMPT_ENABLED,PER_CPU_VAR(__preempt_count)
- + jnz 1f
- +
- + GET_THREAD_INFO(%rcx)
- + cmpl $0, TI_preempt_lazy_count(%rcx)
- + jnz 1f
- +
- + bt $TIF_NEED_RESCHED_LAZY,TI_flags(%rcx)
- + jnc 1f
- +do_preempt_schedule_irq:
- +#endif
- call preempt_schedule_irq
- jmp 0b
- 1:
- @@ -844,8 +860,8 @@
- /* edi: workmask, edx: work */
- retint_careful:
- CFI_RESTORE_STATE
- - bt $TIF_NEED_RESCHED,%edx
- - jnc retint_signal
- + testl $_TIF_NEED_RESCHED_MASK,%edx
- + jz retint_signal
- TRACE_IRQS_ON
- ENABLE_INTERRUPTS(CLBR_NONE)
- pushq_cfi %rdi
- @@ -1118,6 +1134,7 @@
- jmp 2b
- .previous
-
- +#ifndef CONFIG_PREEMPT_RT_FULL
- /* Call softirq on interrupt stack. Interrupts are off. */
- ENTRY(do_softirq_own_stack)
- CFI_STARTPROC
- @@ -1137,6 +1154,7 @@
- ret
- CFI_ENDPROC
- END(do_softirq_own_stack)
- +#endif
-
- #ifdef CONFIG_XEN
- idtentry xen_hypervisor_callback xen_do_hypervisor_callback has_error_code=0
- diff -Nur linux-4.1.39.orig/arch/x86/kernel/irq_32.c linux-4.1.39/arch/x86/kernel/irq_32.c
- --- linux-4.1.39.orig/arch/x86/kernel/irq_32.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/x86/kernel/irq_32.c 2017-04-18 17:56:30.569395424 +0200
- @@ -135,6 +135,7 @@
- cpu, per_cpu(hardirq_stack, cpu), per_cpu(softirq_stack, cpu));
- }
-
- +#ifndef CONFIG_PREEMPT_RT_FULL
- void do_softirq_own_stack(void)
- {
- struct thread_info *curstk;
- @@ -153,6 +154,7 @@
-
- call_on_stack(__do_softirq, isp);
- }
- +#endif
-
- bool handle_irq(unsigned irq, struct pt_regs *regs)
- {
- diff -Nur linux-4.1.39.orig/arch/x86/kernel/kvm.c linux-4.1.39/arch/x86/kernel/kvm.c
- --- linux-4.1.39.orig/arch/x86/kernel/kvm.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/x86/kernel/kvm.c 2017-04-18 17:56:30.569395424 +0200
- @@ -36,6 +36,7 @@
- #include <linux/kprobes.h>
- #include <linux/debugfs.h>
- #include <linux/nmi.h>
- +#include <linux/wait-simple.h>
- #include <asm/timer.h>
- #include <asm/cpu.h>
- #include <asm/traps.h>
- @@ -91,14 +92,14 @@
-
- struct kvm_task_sleep_node {
- struct hlist_node link;
- - wait_queue_head_t wq;
- + struct swait_head wq;
- u32 token;
- int cpu;
- bool halted;
- };
-
- static struct kvm_task_sleep_head {
- - spinlock_t lock;
- + raw_spinlock_t lock;
- struct hlist_head list;
- } async_pf_sleepers[KVM_TASK_SLEEP_HASHSIZE];
-
- @@ -122,17 +123,17 @@
- u32 key = hash_32(token, KVM_TASK_SLEEP_HASHBITS);
- struct kvm_task_sleep_head *b = &async_pf_sleepers[key];
- struct kvm_task_sleep_node n, *e;
- - DEFINE_WAIT(wait);
- + DEFINE_SWAITER(wait);
-
- rcu_irq_enter();
-
- - spin_lock(&b->lock);
- + raw_spin_lock(&b->lock);
- e = _find_apf_task(b, token);
- if (e) {
- /* dummy entry exist -> wake up was delivered ahead of PF */
- hlist_del(&e->link);
- kfree(e);
- - spin_unlock(&b->lock);
- + raw_spin_unlock(&b->lock);
-
- rcu_irq_exit();
- return;
- @@ -141,13 +142,13 @@
- n.token = token;
- n.cpu = smp_processor_id();
- n.halted = is_idle_task(current) || preempt_count() > 1;
- - init_waitqueue_head(&n.wq);
- + init_swait_head(&n.wq);
- hlist_add_head(&n.link, &b->list);
- - spin_unlock(&b->lock);
- + raw_spin_unlock(&b->lock);
-
- for (;;) {
- if (!n.halted)
- - prepare_to_wait(&n.wq, &wait, TASK_UNINTERRUPTIBLE);
- + swait_prepare(&n.wq, &wait, TASK_UNINTERRUPTIBLE);
- if (hlist_unhashed(&n.link))
- break;
-
- @@ -166,7 +167,7 @@
- }
- }
- if (!n.halted)
- - finish_wait(&n.wq, &wait);
- + swait_finish(&n.wq, &wait);
-
- rcu_irq_exit();
- return;
- @@ -178,8 +179,8 @@
- hlist_del_init(&n->link);
- if (n->halted)
- smp_send_reschedule(n->cpu);
- - else if (waitqueue_active(&n->wq))
- - wake_up(&n->wq);
- + else if (swaitqueue_active(&n->wq))
- + swait_wake(&n->wq);
- }
-
- static void apf_task_wake_all(void)
- @@ -189,14 +190,14 @@
- for (i = 0; i < KVM_TASK_SLEEP_HASHSIZE; i++) {
- struct hlist_node *p, *next;
- struct kvm_task_sleep_head *b = &async_pf_sleepers[i];
- - spin_lock(&b->lock);
- + raw_spin_lock(&b->lock);
- hlist_for_each_safe(p, next, &b->list) {
- struct kvm_task_sleep_node *n =
- hlist_entry(p, typeof(*n), link);
- if (n->cpu == smp_processor_id())
- apf_task_wake_one(n);
- }
- - spin_unlock(&b->lock);
- + raw_spin_unlock(&b->lock);
- }
- }
-
- @@ -212,7 +213,7 @@
- }
-
- again:
- - spin_lock(&b->lock);
- + raw_spin_lock(&b->lock);
- n = _find_apf_task(b, token);
- if (!n) {
- /*
- @@ -225,17 +226,17 @@
- * Allocation failed! Busy wait while other cpu
- * handles async PF.
- */
- - spin_unlock(&b->lock);
- + raw_spin_unlock(&b->lock);
- cpu_relax();
- goto again;
- }
- n->token = token;
- n->cpu = smp_processor_id();
- - init_waitqueue_head(&n->wq);
- + init_swait_head(&n->wq);
- hlist_add_head(&n->link, &b->list);
- } else
- apf_task_wake_one(n);
- - spin_unlock(&b->lock);
- + raw_spin_unlock(&b->lock);
- return;
- }
- EXPORT_SYMBOL_GPL(kvm_async_pf_task_wake);
- @@ -486,7 +487,7 @@
- paravirt_ops_setup();
- register_reboot_notifier(&kvm_pv_reboot_nb);
- for (i = 0; i < KVM_TASK_SLEEP_HASHSIZE; i++)
- - spin_lock_init(&async_pf_sleepers[i].lock);
- + raw_spin_lock_init(&async_pf_sleepers[i].lock);
- if (kvm_para_has_feature(KVM_FEATURE_ASYNC_PF))
- x86_init.irqs.trap_init = kvm_apf_trap_init;
-
- diff -Nur linux-4.1.39.orig/arch/x86/kernel/process_32.c linux-4.1.39/arch/x86/kernel/process_32.c
- --- linux-4.1.39.orig/arch/x86/kernel/process_32.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/x86/kernel/process_32.c 2017-04-18 17:56:30.569395424 +0200
- @@ -35,6 +35,7 @@
- #include <linux/uaccess.h>
- #include <linux/io.h>
- #include <linux/kdebug.h>
- +#include <linux/highmem.h>
-
- #include <asm/pgtable.h>
- #include <asm/ldt.h>
- @@ -210,6 +211,35 @@
- }
- EXPORT_SYMBOL_GPL(start_thread);
-
- +#ifdef CONFIG_PREEMPT_RT_FULL
- +static void switch_kmaps(struct task_struct *prev_p, struct task_struct *next_p)
- +{
- + int i;
- +
- + /*
- + * Clear @prev's kmap_atomic mappings
- + */
- + for (i = 0; i < prev_p->kmap_idx; i++) {
- + int idx = i + KM_TYPE_NR * smp_processor_id();
- + pte_t *ptep = kmap_pte - idx;
- +
- + kpte_clear_flush(ptep, __fix_to_virt(FIX_KMAP_BEGIN + idx));
- + }
- + /*
- + * Restore @next_p's kmap_atomic mappings
- + */
- + for (i = 0; i < next_p->kmap_idx; i++) {
- + int idx = i + KM_TYPE_NR * smp_processor_id();
- +
- + if (!pte_none(next_p->kmap_pte[i]))
- + set_pte(kmap_pte - idx, next_p->kmap_pte[i]);
- + }
- +}
- +#else
- +static inline void
- +switch_kmaps(struct task_struct *prev_p, struct task_struct *next_p) { }
- +#endif
- +
-
- /*
- * switch_to(x,y) should switch tasks from x to y.
- @@ -292,6 +322,8 @@
- task_thread_info(next_p)->flags & _TIF_WORK_CTXSW_NEXT))
- __switch_to_xtra(prev_p, next_p, tss);
-
- + switch_kmaps(prev_p, next_p);
- +
- /*
- * Leave lazy mode, flushing any hypercalls made here.
- * This must be done before restoring TLS segments so
- diff -Nur linux-4.1.39.orig/arch/x86/kernel/signal.c linux-4.1.39/arch/x86/kernel/signal.c
- --- linux-4.1.39.orig/arch/x86/kernel/signal.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/x86/kernel/signal.c 2017-04-18 17:56:30.569395424 +0200
- @@ -726,6 +726,14 @@
- {
- user_exit();
-
- +#ifdef ARCH_RT_DELAYS_SIGNAL_SEND
- + if (unlikely(current->forced_info.si_signo)) {
- + struct task_struct *t = current;
- + force_sig_info(t->forced_info.si_signo, &t->forced_info, t);
- + t->forced_info.si_signo = 0;
- + }
- +#endif
- +
- if (thread_info_flags & _TIF_UPROBE)
- uprobe_notify_resume(regs);
-
- diff -Nur linux-4.1.39.orig/arch/x86/kvm/lapic.c linux-4.1.39/arch/x86/kvm/lapic.c
- --- linux-4.1.39.orig/arch/x86/kvm/lapic.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/x86/kvm/lapic.c 2017-04-18 17:56:30.569395424 +0200
- @@ -1106,7 +1106,7 @@
- static void apic_timer_expired(struct kvm_lapic *apic)
- {
- struct kvm_vcpu *vcpu = apic->vcpu;
- - wait_queue_head_t *q = &vcpu->wq;
- + struct swait_head *q = &vcpu->wq;
- struct kvm_timer *ktimer = &apic->lapic_timer;
-
- if (atomic_read(&apic->lapic_timer.pending))
- @@ -1115,8 +1115,8 @@
- atomic_inc(&apic->lapic_timer.pending);
- kvm_set_pending_timer(vcpu);
-
- - if (waitqueue_active(q))
- - wake_up_interruptible(q);
- + if (swaitqueue_active(q))
- + swait_wake_interruptible(q);
-
- if (apic_lvtt_tscdeadline(apic))
- ktimer->expired_tscdeadline = ktimer->tscdeadline;
- @@ -1169,8 +1169,36 @@
- __delay(tsc_deadline - guest_tsc);
- }
-
- +static enum hrtimer_restart apic_timer_fn(struct hrtimer *data);
- +
- +static void __apic_timer_expired(struct hrtimer *data)
- +{
- + int ret, i = 0;
- + enum hrtimer_restart r;
- + struct kvm_timer *ktimer = container_of(data, struct kvm_timer, timer);
- +
- + r = apic_timer_fn(data);
- +
- + if (r == HRTIMER_RESTART) {
- + do {
- + ret = hrtimer_start_expires(data, HRTIMER_MODE_ABS);
- + if (ret == -ETIME)
- + hrtimer_add_expires_ns(&ktimer->timer,
- + ktimer->period);
- + i++;
- + } while (ret == -ETIME && i < 10);
- +
- + if (ret == -ETIME) {
- + printk_once(KERN_ERR "%s: failed to reprogram timer\n",
- + __func__);
- + WARN_ON_ONCE(1);
- + }
- + }
- +}
- +
- static void start_apic_timer(struct kvm_lapic *apic)
- {
- + int ret;
- ktime_t now;
-
- atomic_set(&apic->lapic_timer.pending, 0);
- @@ -1201,9 +1229,11 @@
- }
- }
-
- - hrtimer_start(&apic->lapic_timer.timer,
- + ret = hrtimer_start(&apic->lapic_timer.timer,
- ktime_add_ns(now, apic->lapic_timer.period),
- HRTIMER_MODE_ABS);
- + if (ret == -ETIME)
- + __apic_timer_expired(&apic->lapic_timer.timer);
-
- apic_debug("%s: bus cycle is %" PRId64 "ns, now 0x%016"
- PRIx64 ", "
- @@ -1235,8 +1265,10 @@
- do_div(ns, this_tsc_khz);
- expire = ktime_add_ns(now, ns);
- expire = ktime_sub_ns(expire, lapic_timer_advance_ns);
- - hrtimer_start(&apic->lapic_timer.timer,
- + ret = hrtimer_start(&apic->lapic_timer.timer,
- expire, HRTIMER_MODE_ABS);
- + if (ret == -ETIME)
- + __apic_timer_expired(&apic->lapic_timer.timer);
- } else
- apic_timer_expired(apic);
-
- @@ -1709,6 +1741,7 @@
- hrtimer_init(&apic->lapic_timer.timer, CLOCK_MONOTONIC,
- HRTIMER_MODE_ABS);
- apic->lapic_timer.timer.function = apic_timer_fn;
- + apic->lapic_timer.timer.irqsafe = 1;
-
- /*
- * APIC is created enabled. This will prevent kvm_lapic_set_base from
- @@ -1836,7 +1869,8 @@
-
- timer = &vcpu->arch.apic->lapic_timer.timer;
- if (hrtimer_cancel(timer))
- - hrtimer_start_expires(timer, HRTIMER_MODE_ABS);
- + if (hrtimer_start_expires(timer, HRTIMER_MODE_ABS) == -ETIME)
- + __apic_timer_expired(timer);
- }
-
- /*
- diff -Nur linux-4.1.39.orig/arch/x86/kvm/x86.c linux-4.1.39/arch/x86/kvm/x86.c
- --- linux-4.1.39.orig/arch/x86/kvm/x86.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/x86/kvm/x86.c 2017-04-18 17:56:30.569395424 +0200
- @@ -5837,6 +5837,13 @@
- goto out;
- }
-
- +#ifdef CONFIG_PREEMPT_RT_FULL
- + if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) {
- + printk(KERN_ERR "RT requires X86_FEATURE_CONSTANT_TSC\n");
- + return -EOPNOTSUPP;
- + }
- +#endif
- +
- r = kvm_mmu_module_init();
- if (r)
- goto out_free_percpu;
- diff -Nur linux-4.1.39.orig/arch/x86/lib/usercopy_32.c linux-4.1.39/arch/x86/lib/usercopy_32.c
- --- linux-4.1.39.orig/arch/x86/lib/usercopy_32.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/x86/lib/usercopy_32.c 2017-04-18 17:56:30.573395579 +0200
- @@ -647,7 +647,8 @@
- * @from: Source address, in kernel space.
- * @n: Number of bytes to copy.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * Copy data from kernel space to user space.
- *
- @@ -668,7 +669,8 @@
- * @from: Source address, in user space.
- * @n: Number of bytes to copy.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * Copy data from user space to kernel space.
- *
- diff -Nur linux-4.1.39.orig/arch/x86/mm/fault.c linux-4.1.39/arch/x86/mm/fault.c
- --- linux-4.1.39.orig/arch/x86/mm/fault.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/x86/mm/fault.c 2017-04-18 17:56:30.573395579 +0200
- @@ -13,6 +13,7 @@
- #include <linux/hugetlb.h> /* hstate_index_to_shift */
- #include <linux/prefetch.h> /* prefetchw */
- #include <linux/context_tracking.h> /* exception_enter(), ... */
- +#include <linux/uaccess.h> /* faulthandler_disabled() */
-
- #include <asm/traps.h> /* dotraplinkage, ... */
- #include <asm/pgalloc.h> /* pgd_*(), ... */
- @@ -1133,9 +1134,9 @@
-
- /*
- * If we're in an interrupt, have no user context or are running
- - * in an atomic region then we must not take the fault:
- + * in a region with pagefaults disabled then we must not take the fault
- */
- - if (unlikely(in_atomic() || !mm)) {
- + if (unlikely(faulthandler_disabled() || !mm)) {
- bad_area_nosemaphore(regs, error_code, address);
- return;
- }
- diff -Nur linux-4.1.39.orig/arch/x86/mm/highmem_32.c linux-4.1.39/arch/x86/mm/highmem_32.c
- --- linux-4.1.39.orig/arch/x86/mm/highmem_32.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/x86/mm/highmem_32.c 2017-04-18 17:56:30.573395579 +0200
- @@ -32,10 +32,11 @@
- */
- void *kmap_atomic_prot(struct page *page, pgprot_t prot)
- {
- + pte_t pte = mk_pte(page, prot);
- unsigned long vaddr;
- int idx, type;
-
- - /* even !CONFIG_PREEMPT needs this, for in_atomic in do_page_fault */
- + preempt_disable_nort();
- pagefault_disable();
-
- if (!PageHighMem(page))
- @@ -45,7 +46,10 @@
- idx = type + KM_TYPE_NR*smp_processor_id();
- vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
- BUG_ON(!pte_none(*(kmap_pte-idx)));
- - set_pte(kmap_pte-idx, mk_pte(page, prot));
- +#ifdef CONFIG_PREEMPT_RT_FULL
- + current->kmap_pte[type] = pte;
- +#endif
- + set_pte(kmap_pte-idx, pte);
- arch_flush_lazy_mmu_mode();
-
- return (void *)vaddr;
- @@ -88,6 +92,9 @@
- * is a bad idea also, in case the page changes cacheability
- * attributes or becomes a protected page in a hypervisor.
- */
- +#ifdef CONFIG_PREEMPT_RT_FULL
- + current->kmap_pte[type] = __pte(0);
- +#endif
- kpte_clear_flush(kmap_pte-idx, vaddr);
- kmap_atomic_idx_pop();
- arch_flush_lazy_mmu_mode();
- @@ -100,6 +107,7 @@
- #endif
-
- pagefault_enable();
- + preempt_enable_nort();
- }
- EXPORT_SYMBOL(__kunmap_atomic);
-
- diff -Nur linux-4.1.39.orig/arch/x86/mm/iomap_32.c linux-4.1.39/arch/x86/mm/iomap_32.c
- --- linux-4.1.39.orig/arch/x86/mm/iomap_32.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/x86/mm/iomap_32.c 2017-04-18 17:56:30.573395579 +0200
- @@ -56,15 +56,22 @@
-
- void *kmap_atomic_prot_pfn(unsigned long pfn, pgprot_t prot)
- {
- + pte_t pte = pfn_pte(pfn, prot);
- unsigned long vaddr;
- int idx, type;
-
- + preempt_disable();
- pagefault_disable();
-
- type = kmap_atomic_idx_push();
- idx = type + KM_TYPE_NR * smp_processor_id();
- vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
- - set_pte(kmap_pte - idx, pfn_pte(pfn, prot));
- + WARN_ON(!pte_none(*(kmap_pte - idx)));
- +
- +#ifdef CONFIG_PREEMPT_RT_FULL
- + current->kmap_pte[type] = pte;
- +#endif
- + set_pte(kmap_pte - idx, pte);
- arch_flush_lazy_mmu_mode();
-
- return (void *)vaddr;
- @@ -112,10 +119,14 @@
- * is a bad idea also, in case the page changes cacheability
- * attributes or becomes a protected page in a hypervisor.
- */
- +#ifdef CONFIG_PREEMPT_RT_FULL
- + current->kmap_pte[type] = __pte(0);
- +#endif
- kpte_clear_flush(kmap_pte-idx, vaddr);
- kmap_atomic_idx_pop();
- }
-
- pagefault_enable();
- + preempt_enable();
- }
- EXPORT_SYMBOL_GPL(iounmap_atomic);
- diff -Nur linux-4.1.39.orig/arch/x86/mm/pageattr.c linux-4.1.39/arch/x86/mm/pageattr.c
- --- linux-4.1.39.orig/arch/x86/mm/pageattr.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/x86/mm/pageattr.c 2017-04-18 17:56:30.573395579 +0200
- @@ -209,7 +209,15 @@
- int in_flags, struct page **pages)
- {
- unsigned int i, level;
- +#ifdef CONFIG_PREEMPT
- + /*
- + * Avoid wbinvd() because it causes latencies on all CPUs,
- + * regardless of any CPU isolation that may be in effect.
- + */
- + unsigned long do_wbinvd = 0;
- +#else
- unsigned long do_wbinvd = cache && numpages >= 1024; /* 4M threshold */
- +#endif
-
- BUG_ON(irqs_disabled());
-
- diff -Nur linux-4.1.39.orig/arch/x86/platform/uv/tlb_uv.c linux-4.1.39/arch/x86/platform/uv/tlb_uv.c
- --- linux-4.1.39.orig/arch/x86/platform/uv/tlb_uv.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/x86/platform/uv/tlb_uv.c 2017-04-18 17:56:30.573395579 +0200
- @@ -714,9 +714,9 @@
-
- quiesce_local_uvhub(hmaster);
-
- - spin_lock(&hmaster->queue_lock);
- + raw_spin_lock(&hmaster->queue_lock);
- reset_with_ipi(&bau_desc->distribution, bcp);
- - spin_unlock(&hmaster->queue_lock);
- + raw_spin_unlock(&hmaster->queue_lock);
-
- end_uvhub_quiesce(hmaster);
-
- @@ -736,9 +736,9 @@
-
- quiesce_local_uvhub(hmaster);
-
- - spin_lock(&hmaster->queue_lock);
- + raw_spin_lock(&hmaster->queue_lock);
- reset_with_ipi(&bau_desc->distribution, bcp);
- - spin_unlock(&hmaster->queue_lock);
- + raw_spin_unlock(&hmaster->queue_lock);
-
- end_uvhub_quiesce(hmaster);
-
- @@ -759,7 +759,7 @@
- cycles_t tm1;
-
- hmaster = bcp->uvhub_master;
- - spin_lock(&hmaster->disable_lock);
- + raw_spin_lock(&hmaster->disable_lock);
- if (!bcp->baudisabled) {
- stat->s_bau_disabled++;
- tm1 = get_cycles();
- @@ -772,7 +772,7 @@
- }
- }
- }
- - spin_unlock(&hmaster->disable_lock);
- + raw_spin_unlock(&hmaster->disable_lock);
- }
-
- static void count_max_concurr(int stat, struct bau_control *bcp,
- @@ -835,7 +835,7 @@
- */
- static void uv1_throttle(struct bau_control *hmaster, struct ptc_stats *stat)
- {
- - spinlock_t *lock = &hmaster->uvhub_lock;
- + raw_spinlock_t *lock = &hmaster->uvhub_lock;
- atomic_t *v;
-
- v = &hmaster->active_descriptor_count;
- @@ -968,7 +968,7 @@
- struct bau_control *hmaster;
-
- hmaster = bcp->uvhub_master;
- - spin_lock(&hmaster->disable_lock);
- + raw_spin_lock(&hmaster->disable_lock);
- if (bcp->baudisabled && (get_cycles() >= bcp->set_bau_on_time)) {
- stat->s_bau_reenabled++;
- for_each_present_cpu(tcpu) {
- @@ -980,10 +980,10 @@
- tbcp->period_giveups = 0;
- }
- }
- - spin_unlock(&hmaster->disable_lock);
- + raw_spin_unlock(&hmaster->disable_lock);
- return 0;
- }
- - spin_unlock(&hmaster->disable_lock);
- + raw_spin_unlock(&hmaster->disable_lock);
- return -1;
- }
-
- @@ -1901,9 +1901,9 @@
- bcp->cong_reps = congested_reps;
- bcp->disabled_period = sec_2_cycles(disabled_period);
- bcp->giveup_limit = giveup_limit;
- - spin_lock_init(&bcp->queue_lock);
- - spin_lock_init(&bcp->uvhub_lock);
- - spin_lock_init(&bcp->disable_lock);
- + raw_spin_lock_init(&bcp->queue_lock);
- + raw_spin_lock_init(&bcp->uvhub_lock);
- + raw_spin_lock_init(&bcp->disable_lock);
- }
- }
-
- diff -Nur linux-4.1.39.orig/arch/x86/platform/uv/uv_time.c linux-4.1.39/arch/x86/platform/uv/uv_time.c
- --- linux-4.1.39.orig/arch/x86/platform/uv/uv_time.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/x86/platform/uv/uv_time.c 2017-04-18 17:56:30.573395579 +0200
- @@ -58,7 +58,7 @@
-
- /* There is one of these allocated per node */
- struct uv_rtc_timer_head {
- - spinlock_t lock;
- + raw_spinlock_t lock;
- /* next cpu waiting for timer, local node relative: */
- int next_cpu;
- /* number of cpus on this node: */
- @@ -178,7 +178,7 @@
- uv_rtc_deallocate_timers();
- return -ENOMEM;
- }
- - spin_lock_init(&head->lock);
- + raw_spin_lock_init(&head->lock);
- head->ncpus = uv_blade_nr_possible_cpus(bid);
- head->next_cpu = -1;
- blade_info[bid] = head;
- @@ -232,7 +232,7 @@
- unsigned long flags;
- int next_cpu;
-
- - spin_lock_irqsave(&head->lock, flags);
- + raw_spin_lock_irqsave(&head->lock, flags);
-
- next_cpu = head->next_cpu;
- *t = expires;
- @@ -244,12 +244,12 @@
- if (uv_setup_intr(cpu, expires)) {
- *t = ULLONG_MAX;
- uv_rtc_find_next_timer(head, pnode);
- - spin_unlock_irqrestore(&head->lock, flags);
- + raw_spin_unlock_irqrestore(&head->lock, flags);
- return -ETIME;
- }
- }
-
- - spin_unlock_irqrestore(&head->lock, flags);
- + raw_spin_unlock_irqrestore(&head->lock, flags);
- return 0;
- }
-
- @@ -268,7 +268,7 @@
- unsigned long flags;
- int rc = 0;
-
- - spin_lock_irqsave(&head->lock, flags);
- + raw_spin_lock_irqsave(&head->lock, flags);
-
- if ((head->next_cpu == bcpu && uv_read_rtc(NULL) >= *t) || force)
- rc = 1;
- @@ -280,7 +280,7 @@
- uv_rtc_find_next_timer(head, pnode);
- }
-
- - spin_unlock_irqrestore(&head->lock, flags);
- + raw_spin_unlock_irqrestore(&head->lock, flags);
-
- return rc;
- }
- @@ -300,13 +300,18 @@
- static cycle_t uv_read_rtc(struct clocksource *cs)
- {
- unsigned long offset;
- + cycle_t cycles;
-
- + preempt_disable();
- if (uv_get_min_hub_revision_id() == 1)
- offset = 0;
- else
- offset = (uv_blade_processor_id() * L1_CACHE_BYTES) % PAGE_SIZE;
-
- - return (cycle_t)uv_read_local_mmr(UVH_RTC | offset);
- + cycles = (cycle_t)uv_read_local_mmr(UVH_RTC | offset);
- + preempt_enable();
- +
- + return cycles;
- }
-
- /*
- diff -Nur linux-4.1.39.orig/arch/xtensa/mm/fault.c linux-4.1.39/arch/xtensa/mm/fault.c
- --- linux-4.1.39.orig/arch/xtensa/mm/fault.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/xtensa/mm/fault.c 2017-04-18 17:56:30.573395579 +0200
- @@ -15,10 +15,10 @@
- #include <linux/mm.h>
- #include <linux/module.h>
- #include <linux/hardirq.h>
- +#include <linux/uaccess.h>
- #include <asm/mmu_context.h>
- #include <asm/cacheflush.h>
- #include <asm/hardirq.h>
- -#include <asm/uaccess.h>
- #include <asm/pgalloc.h>
-
- DEFINE_PER_CPU(unsigned long, asid_cache) = ASID_USER_FIRST;
- @@ -57,7 +57,7 @@
- /* If we're in an interrupt or have no user
- * context, we must not take the fault..
- */
- - if (in_atomic() || !mm) {
- + if (faulthandler_disabled() || !mm) {
- bad_page_fault(regs, address, SIGSEGV);
- return;
- }
- diff -Nur linux-4.1.39.orig/arch/xtensa/mm/highmem.c linux-4.1.39/arch/xtensa/mm/highmem.c
- --- linux-4.1.39.orig/arch/xtensa/mm/highmem.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/arch/xtensa/mm/highmem.c 2017-04-18 17:56:30.573395579 +0200
- @@ -42,6 +42,7 @@
- enum fixed_addresses idx;
- unsigned long vaddr;
-
- + preempt_disable();
- pagefault_disable();
- if (!PageHighMem(page))
- return page_address(page);
- @@ -79,6 +80,7 @@
- }
-
- pagefault_enable();
- + preempt_enable();
- }
- EXPORT_SYMBOL(__kunmap_atomic);
-
- diff -Nur linux-4.1.39.orig/block/blk-core.c linux-4.1.39/block/blk-core.c
- --- linux-4.1.39.orig/block/blk-core.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/block/blk-core.c 2017-04-18 17:56:30.573395579 +0200
- @@ -100,6 +100,9 @@
-
- INIT_LIST_HEAD(&rq->queuelist);
- INIT_LIST_HEAD(&rq->timeout_list);
- +#ifdef CONFIG_PREEMPT_RT_FULL
- + INIT_WORK(&rq->work, __blk_mq_complete_request_remote_work);
- +#endif
- rq->cpu = -1;
- rq->q = q;
- rq->__sector = (sector_t) -1;
- @@ -194,7 +197,7 @@
- **/
- void blk_start_queue(struct request_queue *q)
- {
- - WARN_ON(!irqs_disabled());
- + WARN_ON_NONRT(!irqs_disabled());
-
- queue_flag_clear(QUEUE_FLAG_STOPPED, q);
- __blk_run_queue(q);
- @@ -663,7 +666,7 @@
- q->bypass_depth = 1;
- __set_bit(QUEUE_FLAG_BYPASS, &q->queue_flags);
-
- - init_waitqueue_head(&q->mq_freeze_wq);
- + init_swait_head(&q->mq_freeze_wq);
-
- if (blkcg_init_queue(q))
- goto fail_bdi;
- @@ -3079,7 +3082,7 @@
- blk_run_queue_async(q);
- else
- __blk_run_queue(q);
- - spin_unlock(q->queue_lock);
- + spin_unlock_irq(q->queue_lock);
- }
-
- static void flush_plug_callbacks(struct blk_plug *plug, bool from_schedule)
- @@ -3127,7 +3130,6 @@
- void blk_flush_plug_list(struct blk_plug *plug, bool from_schedule)
- {
- struct request_queue *q;
- - unsigned long flags;
- struct request *rq;
- LIST_HEAD(list);
- unsigned int depth;
- @@ -3147,11 +3149,6 @@
- q = NULL;
- depth = 0;
-
- - /*
- - * Save and disable interrupts here, to avoid doing it for every
- - * queue lock we have to take.
- - */
- - local_irq_save(flags);
- while (!list_empty(&list)) {
- rq = list_entry_rq(list.next);
- list_del_init(&rq->queuelist);
- @@ -3164,7 +3161,7 @@
- queue_unplugged(q, depth, from_schedule);
- q = rq->q;
- depth = 0;
- - spin_lock(q->queue_lock);
- + spin_lock_irq(q->queue_lock);
- }
-
- /*
- @@ -3191,8 +3188,6 @@
- */
- if (q)
- queue_unplugged(q, depth, from_schedule);
- -
- - local_irq_restore(flags);
- }
-
- void blk_finish_plug(struct blk_plug *plug)
- diff -Nur linux-4.1.39.orig/block/blk-ioc.c linux-4.1.39/block/blk-ioc.c
- --- linux-4.1.39.orig/block/blk-ioc.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/block/blk-ioc.c 2017-04-18 17:56:30.573395579 +0200
- @@ -7,6 +7,7 @@
- #include <linux/bio.h>
- #include <linux/blkdev.h>
- #include <linux/slab.h>
- +#include <linux/delay.h>
-
- #include "blk.h"
-
- @@ -109,7 +110,7 @@
- spin_unlock(q->queue_lock);
- } else {
- spin_unlock_irqrestore(&ioc->lock, flags);
- - cpu_relax();
- + cpu_chill();
- spin_lock_irqsave_nested(&ioc->lock, flags, 1);
- }
- }
- @@ -187,7 +188,7 @@
- spin_unlock(icq->q->queue_lock);
- } else {
- spin_unlock_irqrestore(&ioc->lock, flags);
- - cpu_relax();
- + cpu_chill();
- goto retry;
- }
- }
- diff -Nur linux-4.1.39.orig/block/blk-iopoll.c linux-4.1.39/block/blk-iopoll.c
- --- linux-4.1.39.orig/block/blk-iopoll.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/block/blk-iopoll.c 2017-04-18 17:56:30.573395579 +0200
- @@ -35,6 +35,7 @@
- list_add_tail(&iop->list, this_cpu_ptr(&blk_cpu_iopoll));
- __raise_softirq_irqoff(BLOCK_IOPOLL_SOFTIRQ);
- local_irq_restore(flags);
- + preempt_check_resched_rt();
- }
- EXPORT_SYMBOL(blk_iopoll_sched);
-
- @@ -132,6 +133,7 @@
- __raise_softirq_irqoff(BLOCK_IOPOLL_SOFTIRQ);
-
- local_irq_enable();
- + preempt_check_resched_rt();
- }
-
- /**
- @@ -201,6 +203,7 @@
- this_cpu_ptr(&blk_cpu_iopoll));
- __raise_softirq_irqoff(BLOCK_IOPOLL_SOFTIRQ);
- local_irq_enable();
- + preempt_check_resched_rt();
- }
-
- return NOTIFY_OK;
- diff -Nur linux-4.1.39.orig/block/blk-mq.c linux-4.1.39/block/blk-mq.c
- --- linux-4.1.39.orig/block/blk-mq.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/block/blk-mq.c 2017-04-18 17:56:30.573395579 +0200
- @@ -88,7 +88,7 @@
- if (!(gfp & __GFP_WAIT))
- return -EBUSY;
-
- - ret = wait_event_interruptible(q->mq_freeze_wq,
- + ret = swait_event_interruptible(q->mq_freeze_wq,
- !q->mq_freeze_depth || blk_queue_dying(q));
- if (blk_queue_dying(q))
- return -ENODEV;
- @@ -107,7 +107,7 @@
- struct request_queue *q =
- container_of(ref, struct request_queue, mq_usage_counter);
-
- - wake_up_all(&q->mq_freeze_wq);
- + swait_wake_all(&q->mq_freeze_wq);
- }
-
- void blk_mq_freeze_queue_start(struct request_queue *q)
- @@ -127,7 +127,7 @@
-
- static void blk_mq_freeze_queue_wait(struct request_queue *q)
- {
- - wait_event(q->mq_freeze_wq, percpu_ref_is_zero(&q->mq_usage_counter));
- + swait_event(q->mq_freeze_wq, percpu_ref_is_zero(&q->mq_usage_counter));
- }
-
- /*
- @@ -151,7 +151,7 @@
- spin_unlock_irq(q->queue_lock);
- if (wake) {
- percpu_ref_reinit(&q->mq_usage_counter);
- - wake_up_all(&q->mq_freeze_wq);
- + swait_wake_all(&q->mq_freeze_wq);
- }
- }
- EXPORT_SYMBOL_GPL(blk_mq_unfreeze_queue);
- @@ -170,7 +170,7 @@
- * dying, we need to ensure that processes currently waiting on
- * the queue are notified as well.
- */
- - wake_up_all(&q->mq_freeze_wq);
- + swait_wake_all(&q->mq_freeze_wq);
- }
-
- bool blk_mq_can_queue(struct blk_mq_hw_ctx *hctx)
- @@ -217,6 +217,9 @@
- rq->resid_len = 0;
- rq->sense = NULL;
-
- +#ifdef CONFIG_PREEMPT_RT_FULL
- + INIT_WORK(&rq->work, __blk_mq_complete_request_remote_work);
- +#endif
- INIT_LIST_HEAD(&rq->timeout_list);
- rq->timeout = 0;
-
- @@ -346,6 +349,17 @@
- }
- EXPORT_SYMBOL(blk_mq_end_request);
-
- +#ifdef CONFIG_PREEMPT_RT_FULL
- +
- +void __blk_mq_complete_request_remote_work(struct work_struct *work)
- +{
- + struct request *rq = container_of(work, struct request, work);
- +
- + rq->q->softirq_done_fn(rq);
- +}
- +
- +#else
- +
- static void __blk_mq_complete_request_remote(void *data)
- {
- struct request *rq = data;
- @@ -353,6 +367,8 @@
- rq->q->softirq_done_fn(rq);
- }
-
- +#endif
- +
- static void blk_mq_ipi_complete_request(struct request *rq)
- {
- struct blk_mq_ctx *ctx = rq->mq_ctx;
- @@ -364,19 +380,23 @@
- return;
- }
-
- - cpu = get_cpu();
- + cpu = get_cpu_light();
- if (!test_bit(QUEUE_FLAG_SAME_FORCE, &rq->q->queue_flags))
- shared = cpus_share_cache(cpu, ctx->cpu);
-
- if (cpu != ctx->cpu && !shared && cpu_online(ctx->cpu)) {
- +#ifdef CONFIG_PREEMPT_RT_FULL
- + schedule_work_on(ctx->cpu, &rq->work);
- +#else
- rq->csd.func = __blk_mq_complete_request_remote;
- rq->csd.info = rq;
- rq->csd.flags = 0;
- smp_call_function_single_async(ctx->cpu, &rq->csd);
- +#endif
- } else {
- rq->q->softirq_done_fn(rq);
- }
- - put_cpu();
- + put_cpu_light();
- }
-
- void __blk_mq_complete_request(struct request *rq)
- @@ -905,14 +925,14 @@
- return;
-
- if (!async) {
- - int cpu = get_cpu();
- + int cpu = get_cpu_light();
- if (cpumask_test_cpu(cpu, hctx->cpumask)) {
- __blk_mq_run_hw_queue(hctx);
- - put_cpu();
- + put_cpu_light();
- return;
- }
-
- - put_cpu();
- + put_cpu_light();
- }
-
- kblockd_schedule_delayed_work_on(blk_mq_hctx_next_cpu(hctx),
- @@ -1589,7 +1609,7 @@
- {
- struct blk_mq_hw_ctx *hctx = data;
-
- - if (action == CPU_DEAD || action == CPU_DEAD_FROZEN)
- + if (action == CPU_POST_DEAD)
- return blk_mq_hctx_cpu_offline(hctx, cpu);
-
- /*
- diff -Nur linux-4.1.39.orig/block/blk-mq-cpu.c linux-4.1.39/block/blk-mq-cpu.c
- --- linux-4.1.39.orig/block/blk-mq-cpu.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/block/blk-mq-cpu.c 2017-04-18 17:56:30.573395579 +0200
- @@ -16,7 +16,7 @@
- #include "blk-mq.h"
-
- static LIST_HEAD(blk_mq_cpu_notify_list);
- -static DEFINE_RAW_SPINLOCK(blk_mq_cpu_notify_lock);
- +static DEFINE_SPINLOCK(blk_mq_cpu_notify_lock);
-
- static int blk_mq_main_cpu_notify(struct notifier_block *self,
- unsigned long action, void *hcpu)
- @@ -25,7 +25,10 @@
- struct blk_mq_cpu_notifier *notify;
- int ret = NOTIFY_OK;
-
- - raw_spin_lock(&blk_mq_cpu_notify_lock);
- + if (action != CPU_POST_DEAD)
- + return NOTIFY_OK;
- +
- + spin_lock(&blk_mq_cpu_notify_lock);
-
- list_for_each_entry(notify, &blk_mq_cpu_notify_list, list) {
- ret = notify->notify(notify->data, action, cpu);
- @@ -33,7 +36,7 @@
- break;
- }
-
- - raw_spin_unlock(&blk_mq_cpu_notify_lock);
- + spin_unlock(&blk_mq_cpu_notify_lock);
- return ret;
- }
-
- @@ -41,16 +44,16 @@
- {
- BUG_ON(!notifier->notify);
-
- - raw_spin_lock(&blk_mq_cpu_notify_lock);
- + spin_lock(&blk_mq_cpu_notify_lock);
- list_add_tail(¬ifier->list, &blk_mq_cpu_notify_list);
- - raw_spin_unlock(&blk_mq_cpu_notify_lock);
- + spin_unlock(&blk_mq_cpu_notify_lock);
- }
-
- void blk_mq_unregister_cpu_notifier(struct blk_mq_cpu_notifier *notifier)
- {
- - raw_spin_lock(&blk_mq_cpu_notify_lock);
- + spin_lock(&blk_mq_cpu_notify_lock);
- list_del(¬ifier->list);
- - raw_spin_unlock(&blk_mq_cpu_notify_lock);
- + spin_unlock(&blk_mq_cpu_notify_lock);
- }
-
- void blk_mq_init_cpu_notifier(struct blk_mq_cpu_notifier *notifier,
- diff -Nur linux-4.1.39.orig/block/blk-mq.h linux-4.1.39/block/blk-mq.h
- --- linux-4.1.39.orig/block/blk-mq.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/block/blk-mq.h 2017-04-18 17:56:30.573395579 +0200
- @@ -76,7 +76,10 @@
- static inline struct blk_mq_ctx *__blk_mq_get_ctx(struct request_queue *q,
- unsigned int cpu)
- {
- - return per_cpu_ptr(q->queue_ctx, cpu);
- + struct blk_mq_ctx *ctx;
- +
- + ctx = per_cpu_ptr(q->queue_ctx, cpu);
- + return ctx;
- }
-
- /*
- @@ -87,12 +90,12 @@
- */
- static inline struct blk_mq_ctx *blk_mq_get_ctx(struct request_queue *q)
- {
- - return __blk_mq_get_ctx(q, get_cpu());
- + return __blk_mq_get_ctx(q, get_cpu_light());
- }
-
- static inline void blk_mq_put_ctx(struct blk_mq_ctx *ctx)
- {
- - put_cpu();
- + put_cpu_light();
- }
-
- struct blk_mq_alloc_data {
- diff -Nur linux-4.1.39.orig/block/blk-softirq.c linux-4.1.39/block/blk-softirq.c
- --- linux-4.1.39.orig/block/blk-softirq.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/block/blk-softirq.c 2017-04-18 17:56:30.573395579 +0200
- @@ -51,6 +51,7 @@
- raise_softirq_irqoff(BLOCK_SOFTIRQ);
-
- local_irq_restore(flags);
- + preempt_check_resched_rt();
- }
-
- /*
- @@ -93,6 +94,7 @@
- this_cpu_ptr(&blk_cpu_done));
- raise_softirq_irqoff(BLOCK_SOFTIRQ);
- local_irq_enable();
- + preempt_check_resched_rt();
- }
-
- return NOTIFY_OK;
- @@ -150,6 +152,7 @@
- goto do_local;
-
- local_irq_restore(flags);
- + preempt_check_resched_rt();
- }
-
- /**
- diff -Nur linux-4.1.39.orig/block/bounce.c linux-4.1.39/block/bounce.c
- --- linux-4.1.39.orig/block/bounce.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/block/bounce.c 2017-04-18 17:56:30.573395579 +0200
- @@ -54,11 +54,11 @@
- unsigned long flags;
- unsigned char *vto;
-
- - local_irq_save(flags);
- + local_irq_save_nort(flags);
- vto = kmap_atomic(to->bv_page);
- memcpy(vto + to->bv_offset, vfrom, to->bv_len);
- kunmap_atomic(vto);
- - local_irq_restore(flags);
- + local_irq_restore_nort(flags);
- }
-
- #else /* CONFIG_HIGHMEM */
- diff -Nur linux-4.1.39.orig/crypto/algapi.c linux-4.1.39/crypto/algapi.c
- --- linux-4.1.39.orig/crypto/algapi.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/crypto/algapi.c 2017-04-18 17:56:30.573395579 +0200
- @@ -696,13 +696,13 @@
-
- int crypto_register_notifier(struct notifier_block *nb)
- {
- - return blocking_notifier_chain_register(&crypto_chain, nb);
- + return srcu_notifier_chain_register(&crypto_chain, nb);
- }
- EXPORT_SYMBOL_GPL(crypto_register_notifier);
-
- int crypto_unregister_notifier(struct notifier_block *nb)
- {
- - return blocking_notifier_chain_unregister(&crypto_chain, nb);
- + return srcu_notifier_chain_unregister(&crypto_chain, nb);
- }
- EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
-
- diff -Nur linux-4.1.39.orig/crypto/api.c linux-4.1.39/crypto/api.c
- --- linux-4.1.39.orig/crypto/api.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/crypto/api.c 2017-04-18 17:56:30.573395579 +0200
- @@ -31,7 +31,7 @@
- DECLARE_RWSEM(crypto_alg_sem);
- EXPORT_SYMBOL_GPL(crypto_alg_sem);
-
- -BLOCKING_NOTIFIER_HEAD(crypto_chain);
- +SRCU_NOTIFIER_HEAD(crypto_chain);
- EXPORT_SYMBOL_GPL(crypto_chain);
-
- static struct crypto_alg *crypto_larval_wait(struct crypto_alg *alg);
- @@ -236,10 +236,10 @@
- {
- int ok;
-
- - ok = blocking_notifier_call_chain(&crypto_chain, val, v);
- + ok = srcu_notifier_call_chain(&crypto_chain, val, v);
- if (ok == NOTIFY_DONE) {
- request_module("cryptomgr");
- - ok = blocking_notifier_call_chain(&crypto_chain, val, v);
- + ok = srcu_notifier_call_chain(&crypto_chain, val, v);
- }
-
- return ok;
- diff -Nur linux-4.1.39.orig/crypto/internal.h linux-4.1.39/crypto/internal.h
- --- linux-4.1.39.orig/crypto/internal.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/crypto/internal.h 2017-04-18 17:56:30.573395579 +0200
- @@ -48,7 +48,7 @@
-
- extern struct list_head crypto_alg_list;
- extern struct rw_semaphore crypto_alg_sem;
- -extern struct blocking_notifier_head crypto_chain;
- +extern struct srcu_notifier_head crypto_chain;
-
- #ifdef CONFIG_PROC_FS
- void __init crypto_init_proc(void);
- @@ -142,7 +142,7 @@
-
- static inline void crypto_notify(unsigned long val, void *v)
- {
- - blocking_notifier_call_chain(&crypto_chain, val, v);
- + srcu_notifier_call_chain(&crypto_chain, val, v);
- }
-
- #endif /* _CRYPTO_INTERNAL_H */
- diff -Nur linux-4.1.39.orig/Documentation/hwlat_detector.txt linux-4.1.39/Documentation/hwlat_detector.txt
- --- linux-4.1.39.orig/Documentation/hwlat_detector.txt 1970-01-01 01:00:00.000000000 +0100
- +++ linux-4.1.39/Documentation/hwlat_detector.txt 2017-04-18 17:56:30.545394493 +0200
- @@ -0,0 +1,64 @@
- +Introduction:
- +-------------
- +
- +The module hwlat_detector is a special purpose kernel module that is used to
- +detect large system latencies induced by the behavior of certain underlying
- +hardware or firmware, independent of Linux itself. The code was developed
- +originally to detect SMIs (System Management Interrupts) on x86 systems,
- +however there is nothing x86 specific about this patchset. It was
- +originally written for use by the "RT" patch since the Real Time
- +kernel is highly latency sensitive.
- +
- +SMIs are usually not serviced by the Linux kernel, which typically does not
- +even know that they are occuring. SMIs are instead are set up by BIOS code
- +and are serviced by BIOS code, usually for "critical" events such as
- +management of thermal sensors and fans. Sometimes though, SMIs are used for
- +other tasks and those tasks can spend an inordinate amount of time in the
- +handler (sometimes measured in milliseconds). Obviously this is a problem if
- +you are trying to keep event service latencies down in the microsecond range.
- +
- +The hardware latency detector works by hogging all of the cpus for configurable
- +amounts of time (by calling stop_machine()), polling the CPU Time Stamp Counter
- +for some period, then looking for gaps in the TSC data. Any gap indicates a
- +time when the polling was interrupted and since the machine is stopped and
- +interrupts turned off the only thing that could do that would be an SMI.
- +
- +Note that the SMI detector should *NEVER* be used in a production environment.
- +It is intended to be run manually to determine if the hardware platform has a
- +problem with long system firmware service routines.
- +
- +Usage:
- +------
- +
- +Loading the module hwlat_detector passing the parameter "enabled=1" (or by
- +setting the "enable" entry in "hwlat_detector" debugfs toggled on) is the only
- +step required to start the hwlat_detector. It is possible to redefine the
- +threshold in microseconds (us) above which latency spikes will be taken
- +into account (parameter "threshold=").
- +
- +Example:
- +
- + # modprobe hwlat_detector enabled=1 threshold=100
- +
- +After the module is loaded, it creates a directory named "hwlat_detector" under
- +the debugfs mountpoint, "/debug/hwlat_detector" for this text. It is necessary
- +to have debugfs mounted, which might be on /sys/debug on your system.
- +
- +The /debug/hwlat_detector interface contains the following files:
- +
- +count - number of latency spikes observed since last reset
- +enable - a global enable/disable toggle (0/1), resets count
- +max - maximum hardware latency actually observed (usecs)
- +sample - a pipe from which to read current raw sample data
- + in the format <timestamp> <latency observed usecs>
- + (can be opened O_NONBLOCK for a single sample)
- +threshold - minimum latency value to be considered (usecs)
- +width - time period to sample with CPUs held (usecs)
- + must be less than the total window size (enforced)
- +window - total period of sampling, width being inside (usecs)
- +
- +By default we will set width to 500,000 and window to 1,000,000, meaning that
- +we will sample every 1,000,000 usecs (1s) for 500,000 usecs (0.5s). If we
- +observe any latencies that exceed the threshold (initially 100 usecs),
- +then we write to a global sample ring buffer of 8K samples, which is
- +consumed by reading from the "sample" (pipe) debugfs file interface.
- diff -Nur linux-4.1.39.orig/Documentation/sysrq.txt linux-4.1.39/Documentation/sysrq.txt
- --- linux-4.1.39.orig/Documentation/sysrq.txt 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/Documentation/sysrq.txt 2017-04-18 17:56:30.545394493 +0200
- @@ -59,10 +59,17 @@
- On other - If you know of the key combos for other architectures, please
- let me know so I can add them to this section.
-
- -On all - write a character to /proc/sysrq-trigger. e.g.:
- -
- +On all - write a character to /proc/sysrq-trigger, e.g.:
- echo t > /proc/sysrq-trigger
-
- +On all - Enable network SysRq by writing a cookie to icmp_echo_sysrq, e.g.
- + echo 0x01020304 >/proc/sys/net/ipv4/icmp_echo_sysrq
- + Send an ICMP echo request with this pattern plus the particular
- + SysRq command key. Example:
- + # ping -c1 -s57 -p0102030468
- + will trigger the SysRq-H (help) command.
- +
- +
- * What are the 'command' keys?
- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- 'b' - Will immediately reboot the system without syncing or unmounting
- diff -Nur linux-4.1.39.orig/Documentation/trace/histograms.txt linux-4.1.39/Documentation/trace/histograms.txt
- --- linux-4.1.39.orig/Documentation/trace/histograms.txt 1970-01-01 01:00:00.000000000 +0100
- +++ linux-4.1.39/Documentation/trace/histograms.txt 2017-04-18 17:56:30.545394493 +0200
- @@ -0,0 +1,186 @@
- + Using the Linux Kernel Latency Histograms
- +
- +
- +This document gives a short explanation how to enable, configure and use
- +latency histograms. Latency histograms are primarily relevant in the
- +context of real-time enabled kernels (CONFIG_PREEMPT/CONFIG_PREEMPT_RT)
- +and are used in the quality management of the Linux real-time
- +capabilities.
- +
- +
- +* Purpose of latency histograms
- +
- +A latency histogram continuously accumulates the frequencies of latency
- +data. There are two types of histograms
- +- potential sources of latencies
- +- effective latencies
- +
- +
- +* Potential sources of latencies
- +
- +Potential sources of latencies are code segments where interrupts,
- +preemption or both are disabled (aka critical sections). To create
- +histograms of potential sources of latency, the kernel stores the time
- +stamp at the start of a critical section, determines the time elapsed
- +when the end of the section is reached, and increments the frequency
- +counter of that latency value - irrespective of whether any concurrently
- +running process is affected by latency or not.
- +- Configuration items (in the Kernel hacking/Tracers submenu)
- + CONFIG_INTERRUPT_OFF_LATENCY
- + CONFIG_PREEMPT_OFF_LATENCY
- +
- +
- +* Effective latencies
- +
- +Effective latencies are actually occuring during wakeup of a process. To
- +determine effective latencies, the kernel stores the time stamp when a
- +process is scheduled to be woken up, and determines the duration of the
- +wakeup time shortly before control is passed over to this process. Note
- +that the apparent latency in user space may be somewhat longer, since the
- +process may be interrupted after control is passed over to it but before
- +the execution in user space takes place. Simply measuring the interval
- +between enqueuing and wakeup may also not appropriate in cases when a
- +process is scheduled as a result of a timer expiration. The timer may have
- +missed its deadline, e.g. due to disabled interrupts, but this latency
- +would not be registered. Therefore, the offsets of missed timers are
- +recorded in a separate histogram. If both wakeup latency and missed timer
- +offsets are configured and enabled, a third histogram may be enabled that
- +records the overall latency as a sum of the timer latency, if any, and the
- +wakeup latency. This histogram is called "timerandwakeup".
- +- Configuration items (in the Kernel hacking/Tracers submenu)
- + CONFIG_WAKEUP_LATENCY
- + CONFIG_MISSED_TIMER_OFSETS
- +
- +
- +* Usage
- +
- +The interface to the administration of the latency histograms is located
- +in the debugfs file system. To mount it, either enter
- +
- +mount -t sysfs nodev /sys
- +mount -t debugfs nodev /sys/kernel/debug
- +
- +from shell command line level, or add
- +
- +nodev /sys sysfs defaults 0 0
- +nodev /sys/kernel/debug debugfs defaults 0 0
- +
- +to the file /etc/fstab. All latency histogram related files are then
- +available in the directory /sys/kernel/debug/tracing/latency_hist. A
- +particular histogram type is enabled by writing non-zero to the related
- +variable in the /sys/kernel/debug/tracing/latency_hist/enable directory.
- +Select "preemptirqsoff" for the histograms of potential sources of
- +latencies and "wakeup" for histograms of effective latencies etc. The
- +histogram data - one per CPU - are available in the files
- +
- +/sys/kernel/debug/tracing/latency_hist/preemptoff/CPUx
- +/sys/kernel/debug/tracing/latency_hist/irqsoff/CPUx
- +/sys/kernel/debug/tracing/latency_hist/preemptirqsoff/CPUx
- +/sys/kernel/debug/tracing/latency_hist/wakeup/CPUx
- +/sys/kernel/debug/tracing/latency_hist/wakeup/sharedprio/CPUx
- +/sys/kernel/debug/tracing/latency_hist/missed_timer_offsets/CPUx
- +/sys/kernel/debug/tracing/latency_hist/timerandwakeup/CPUx
- +
- +The histograms are reset by writing non-zero to the file "reset" in a
- +particular latency directory. To reset all latency data, use
- +
- +#!/bin/sh
- +
- +TRACINGDIR=/sys/kernel/debug/tracing
- +HISTDIR=$TRACINGDIR/latency_hist
- +
- +if test -d $HISTDIR
- +then
- + cd $HISTDIR
- + for i in `find . | grep /reset$`
- + do
- + echo 1 >$i
- + done
- +fi
- +
- +
- +* Data format
- +
- +Latency data are stored with a resolution of one microsecond. The
- +maximum latency is 10,240 microseconds. The data are only valid, if the
- +overflow register is empty. Every output line contains the latency in
- +microseconds in the first row and the number of samples in the second
- +row. To display only lines with a positive latency count, use, for
- +example,
- +
- +grep -v " 0$" /sys/kernel/debug/tracing/latency_hist/preemptoff/CPU0
- +
- +#Minimum latency: 0 microseconds.
- +#Average latency: 0 microseconds.
- +#Maximum latency: 25 microseconds.
- +#Total samples: 3104770694
- +#There are 0 samples greater or equal than 10240 microseconds
- +#usecs samples
- + 0 2984486876
- + 1 49843506
- + 2 58219047
- + 3 5348126
- + 4 2187960
- + 5 3388262
- + 6 959289
- + 7 208294
- + 8 40420
- + 9 4485
- + 10 14918
- + 11 18340
- + 12 25052
- + 13 19455
- + 14 5602
- + 15 969
- + 16 47
- + 17 18
- + 18 14
- + 19 1
- + 20 3
- + 21 2
- + 22 5
- + 23 2
- + 25 1
- +
- +
- +* Wakeup latency of a selected process
- +
- +To only collect wakeup latency data of a particular process, write the
- +PID of the requested process to
- +
- +/sys/kernel/debug/tracing/latency_hist/wakeup/pid
- +
- +PIDs are not considered, if this variable is set to 0.
- +
- +
- +* Details of the process with the highest wakeup latency so far
- +
- +Selected data of the process that suffered from the highest wakeup
- +latency that occurred in a particular CPU are available in the file
- +
- +/sys/kernel/debug/tracing/latency_hist/wakeup/max_latency-CPUx.
- +
- +In addition, other relevant system data at the time when the
- +latency occurred are given.
- +
- +The format of the data is (all in one line):
- +<PID> <Priority> <Latency> (<Timeroffset>) <Command> \
- +<- <PID> <Priority> <Command> <Timestamp>
- +
- +The value of <Timeroffset> is only relevant in the combined timer
- +and wakeup latency recording. In the wakeup recording, it is
- +always 0, in the missed_timer_offsets recording, it is the same
- +as <Latency>.
- +
- +When retrospectively searching for the origin of a latency and
- +tracing was not enabled, it may be helpful to know the name and
- +some basic data of the task that (finally) was switching to the
- +late real-tlme task. In addition to the victim's data, also the
- +data of the possible culprit are therefore displayed after the
- +"<-" symbol.
- +
- +Finally, the timestamp of the time when the latency occurred
- +in <seconds>.<microseconds> after the most recent system boot
- +is provided.
- +
- +These data are also reset when the wakeup histogram is reset.
- diff -Nur linux-4.1.39.orig/drivers/acpi/acpica/acglobal.h linux-4.1.39/drivers/acpi/acpica/acglobal.h
- --- linux-4.1.39.orig/drivers/acpi/acpica/acglobal.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/acpi/acpica/acglobal.h 2017-04-18 17:56:30.573395579 +0200
- @@ -112,7 +112,7 @@
- * interrupt level
- */
- ACPI_GLOBAL(acpi_spinlock, acpi_gbl_gpe_lock); /* For GPE data structs and registers */
- -ACPI_GLOBAL(acpi_spinlock, acpi_gbl_hardware_lock); /* For ACPI H/W except GPE registers */
- +ACPI_GLOBAL(acpi_raw_spinlock, acpi_gbl_hardware_lock); /* For ACPI H/W except GPE registers */
- ACPI_GLOBAL(acpi_spinlock, acpi_gbl_reference_count_lock);
-
- /* Mutex for _OSI support */
- diff -Nur linux-4.1.39.orig/drivers/acpi/acpica/hwregs.c linux-4.1.39/drivers/acpi/acpica/hwregs.c
- --- linux-4.1.39.orig/drivers/acpi/acpica/hwregs.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/acpi/acpica/hwregs.c 2017-04-18 17:56:30.573395579 +0200
- @@ -269,14 +269,14 @@
- ACPI_BITMASK_ALL_FIXED_STATUS,
- ACPI_FORMAT_UINT64(acpi_gbl_xpm1a_status.address)));
-
- - lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);
- + raw_spin_lock_irqsave(acpi_gbl_hardware_lock, lock_flags);
-
- /* Clear the fixed events in PM1 A/B */
-
- status = acpi_hw_register_write(ACPI_REGISTER_PM1_STATUS,
- ACPI_BITMASK_ALL_FIXED_STATUS);
-
- - acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags);
- + raw_spin_unlock_irqrestore(acpi_gbl_hardware_lock, lock_flags);
-
- if (ACPI_FAILURE(status)) {
- goto exit;
- diff -Nur linux-4.1.39.orig/drivers/acpi/acpica/hwxface.c linux-4.1.39/drivers/acpi/acpica/hwxface.c
- --- linux-4.1.39.orig/drivers/acpi/acpica/hwxface.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/acpi/acpica/hwxface.c 2017-04-18 17:56:30.577395735 +0200
- @@ -374,7 +374,7 @@
- return_ACPI_STATUS(AE_BAD_PARAMETER);
- }
-
- - lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);
- + raw_spin_lock_irqsave(acpi_gbl_hardware_lock, lock_flags);
-
- /*
- * At this point, we know that the parent register is one of the
- @@ -435,7 +435,7 @@
-
- unlock_and_exit:
-
- - acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags);
- + raw_spin_unlock_irqrestore(acpi_gbl_hardware_lock, lock_flags);
- return_ACPI_STATUS(status);
- }
-
- diff -Nur linux-4.1.39.orig/drivers/acpi/acpica/utmutex.c linux-4.1.39/drivers/acpi/acpica/utmutex.c
- --- linux-4.1.39.orig/drivers/acpi/acpica/utmutex.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/acpi/acpica/utmutex.c 2017-04-18 17:56:30.577395735 +0200
- @@ -88,7 +88,7 @@
- return_ACPI_STATUS (status);
- }
-
- - status = acpi_os_create_lock (&acpi_gbl_hardware_lock);
- + status = acpi_os_create_raw_lock (&acpi_gbl_hardware_lock);
- if (ACPI_FAILURE (status)) {
- return_ACPI_STATUS (status);
- }
- @@ -141,7 +141,7 @@
- /* Delete the spinlocks */
-
- acpi_os_delete_lock(acpi_gbl_gpe_lock);
- - acpi_os_delete_lock(acpi_gbl_hardware_lock);
- + acpi_os_delete_raw_lock(acpi_gbl_hardware_lock);
- acpi_os_delete_lock(acpi_gbl_reference_count_lock);
-
- /* Delete the reader/writer lock */
- diff -Nur linux-4.1.39.orig/drivers/ata/libata-sff.c linux-4.1.39/drivers/ata/libata-sff.c
- --- linux-4.1.39.orig/drivers/ata/libata-sff.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/ata/libata-sff.c 2017-04-18 17:56:30.577395735 +0200
- @@ -678,9 +678,9 @@
- unsigned long flags;
- unsigned int consumed;
-
- - local_irq_save(flags);
- + local_irq_save_nort(flags);
- consumed = ata_sff_data_xfer32(dev, buf, buflen, rw);
- - local_irq_restore(flags);
- + local_irq_restore_nort(flags);
-
- return consumed;
- }
- @@ -719,7 +719,7 @@
- unsigned long flags;
-
- /* FIXME: use a bounce buffer */
- - local_irq_save(flags);
- + local_irq_save_nort(flags);
- buf = kmap_atomic(page);
-
- /* do the actual data transfer */
- @@ -727,7 +727,7 @@
- do_write);
-
- kunmap_atomic(buf);
- - local_irq_restore(flags);
- + local_irq_restore_nort(flags);
- } else {
- buf = page_address(page);
- ap->ops->sff_data_xfer(qc->dev, buf + offset, qc->sect_size,
- @@ -864,7 +864,7 @@
- unsigned long flags;
-
- /* FIXME: use bounce buffer */
- - local_irq_save(flags);
- + local_irq_save_nort(flags);
- buf = kmap_atomic(page);
-
- /* do the actual data transfer */
- @@ -872,7 +872,7 @@
- count, rw);
-
- kunmap_atomic(buf);
- - local_irq_restore(flags);
- + local_irq_restore_nort(flags);
- } else {
- buf = page_address(page);
- consumed = ap->ops->sff_data_xfer(dev, buf + offset,
- diff -Nur linux-4.1.39.orig/drivers/block/zram/zram_drv.c linux-4.1.39/drivers/block/zram/zram_drv.c
- --- linux-4.1.39.orig/drivers/block/zram/zram_drv.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/block/zram/zram_drv.c 2017-04-18 17:56:30.577395735 +0200
- @@ -386,6 +386,8 @@
- goto out_error;
- }
-
- + zram_meta_init_table_locks(meta, disksize);
- +
- return meta;
-
- out_error:
- @@ -484,12 +486,12 @@
- unsigned long handle;
- size_t size;
-
- - bit_spin_lock(ZRAM_ACCESS, &meta->table[index].value);
- + zram_lock_table(&meta->table[index]);
- handle = meta->table[index].handle;
- size = zram_get_obj_size(meta, index);
-
- if (!handle || zram_test_flag(meta, index, ZRAM_ZERO)) {
- - bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value);
- + zram_unlock_table(&meta->table[index]);
- clear_page(mem);
- return 0;
- }
- @@ -500,7 +502,7 @@
- else
- ret = zcomp_decompress(zram->comp, cmem, size, mem);
- zs_unmap_object(meta->mem_pool, handle);
- - bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value);
- + zram_unlock_table(&meta->table[index]);
-
- /* Should NEVER happen. Return bio error if it does. */
- if (unlikely(ret)) {
- @@ -520,14 +522,14 @@
- struct zram_meta *meta = zram->meta;
- page = bvec->bv_page;
-
- - bit_spin_lock(ZRAM_ACCESS, &meta->table[index].value);
- + zram_lock_table(&meta->table[index]);
- if (unlikely(!meta->table[index].handle) ||
- zram_test_flag(meta, index, ZRAM_ZERO)) {
- - bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value);
- + zram_unlock_table(&meta->table[index]);
- handle_zero_page(bvec);
- return 0;
- }
- - bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value);
- + zram_unlock_table(&meta->table[index]);
-
- if (is_partial_io(bvec))
- /* Use a temporary buffer to decompress the page */
- @@ -622,10 +624,10 @@
- if (user_mem)
- kunmap_atomic(user_mem);
- /* Free memory associated with this sector now. */
- - bit_spin_lock(ZRAM_ACCESS, &meta->table[index].value);
- + zram_lock_table(&meta->table[index]);
- zram_free_page(zram, index);
- zram_set_flag(meta, index, ZRAM_ZERO);
- - bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value);
- + zram_unlock_table(&meta->table[index]);
-
- atomic64_inc(&zram->stats.zero_pages);
- ret = 0;
- @@ -685,12 +687,12 @@
- * Free memory associated with this sector
- * before overwriting unused sectors.
- */
- - bit_spin_lock(ZRAM_ACCESS, &meta->table[index].value);
- + zram_lock_table(&meta->table[index]);
- zram_free_page(zram, index);
-
- meta->table[index].handle = handle;
- zram_set_obj_size(meta, index, clen);
- - bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value);
- + zram_unlock_table(&meta->table[index]);
-
- /* Update stats */
- atomic64_add(clen, &zram->stats.compr_data_size);
- @@ -762,9 +764,9 @@
- }
-
- while (n >= PAGE_SIZE) {
- - bit_spin_lock(ZRAM_ACCESS, &meta->table[index].value);
- + zram_lock_table(&meta->table[index]);
- zram_free_page(zram, index);
- - bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value);
- + zram_unlock_table(&meta->table[index]);
- atomic64_inc(&zram->stats.notify_free);
- index++;
- n -= PAGE_SIZE;
- @@ -1007,9 +1009,9 @@
- zram = bdev->bd_disk->private_data;
- meta = zram->meta;
-
- - bit_spin_lock(ZRAM_ACCESS, &meta->table[index].value);
- + zram_lock_table(&meta->table[index]);
- zram_free_page(zram, index);
- - bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value);
- + zram_unlock_table(&meta->table[index]);
- atomic64_inc(&zram->stats.notify_free);
- }
-
- diff -Nur linux-4.1.39.orig/drivers/block/zram/zram_drv.h linux-4.1.39/drivers/block/zram/zram_drv.h
- --- linux-4.1.39.orig/drivers/block/zram/zram_drv.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/block/zram/zram_drv.h 2017-04-18 17:56:30.577395735 +0200
- @@ -78,6 +78,9 @@
- struct zram_table_entry {
- unsigned long handle;
- unsigned long value;
- +#ifdef CONFIG_PREEMPT_RT_BASE
- + spinlock_t lock;
- +#endif
- };
-
- struct zram_stats {
- @@ -122,4 +125,42 @@
- u64 disksize; /* bytes */
- char compressor[10];
- };
- +
- +#ifndef CONFIG_PREEMPT_RT_BASE
- +static inline void zram_lock_table(struct zram_table_entry *table)
- +{
- + bit_spin_lock(ZRAM_ACCESS, &table->value);
- +}
- +
- +static inline void zram_unlock_table(struct zram_table_entry *table)
- +{
- + bit_spin_unlock(ZRAM_ACCESS, &table->value);
- +}
- +
- +static inline void zram_meta_init_table_locks(struct zram_meta *meta, u64 disksize) { }
- +#else /* CONFIG_PREEMPT_RT_BASE */
- +static inline void zram_lock_table(struct zram_table_entry *table)
- +{
- + spin_lock(&table->lock);
- + __set_bit(ZRAM_ACCESS, &table->value);
- +}
- +
- +static inline void zram_unlock_table(struct zram_table_entry *table)
- +{
- + __clear_bit(ZRAM_ACCESS, &table->value);
- + spin_unlock(&table->lock);
- +}
- +
- +static inline void zram_meta_init_table_locks(struct zram_meta *meta, u64 disksize)
- +{
- + size_t num_pages = disksize >> PAGE_SHIFT;
- + size_t index;
- +
- + for (index = 0; index < num_pages; index++) {
- + spinlock_t *lock = &meta->table[index].lock;
- + spin_lock_init(lock);
- + }
- +}
- +#endif /* CONFIG_PREEMPT_RT_BASE */
- +
- #endif
- diff -Nur linux-4.1.39.orig/drivers/char/random.c linux-4.1.39/drivers/char/random.c
- --- linux-4.1.39.orig/drivers/char/random.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/char/random.c 2017-04-18 17:56:30.577395735 +0200
- @@ -776,8 +776,6 @@
- } sample;
- long delta, delta2, delta3;
-
- - preempt_disable();
- -
- sample.jiffies = jiffies;
- sample.cycles = random_get_entropy();
- sample.num = num;
- @@ -818,7 +816,6 @@
- */
- credit_entropy_bits(r, min_t(int, fls(delta>>1), 11));
- }
- - preempt_enable();
- }
-
- void add_input_randomness(unsigned int type, unsigned int code,
- @@ -871,28 +868,27 @@
- return *(ptr + f->reg_idx++);
- }
-
- -void add_interrupt_randomness(int irq, int irq_flags)
- +void add_interrupt_randomness(int irq, int irq_flags, __u64 ip)
- {
- struct entropy_store *r;
- struct fast_pool *fast_pool = this_cpu_ptr(&irq_randomness);
- - struct pt_regs *regs = get_irq_regs();
- unsigned long now = jiffies;
- cycles_t cycles = random_get_entropy();
- __u32 c_high, j_high;
- - __u64 ip;
- unsigned long seed;
- int credit = 0;
-
- if (cycles == 0)
- - cycles = get_reg(fast_pool, regs);
- + cycles = get_reg(fast_pool, NULL);
- c_high = (sizeof(cycles) > 4) ? cycles >> 32 : 0;
- j_high = (sizeof(now) > 4) ? now >> 32 : 0;
- fast_pool->pool[0] ^= cycles ^ j_high ^ irq;
- fast_pool->pool[1] ^= now ^ c_high;
- - ip = regs ? instruction_pointer(regs) : _RET_IP_;
- + if (!ip)
- + ip = _RET_IP_;
- fast_pool->pool[2] ^= ip;
- fast_pool->pool[3] ^= (sizeof(ip) > 4) ? ip >> 32 :
- - get_reg(fast_pool, regs);
- + get_reg(fast_pool, NULL);
-
- fast_mix(fast_pool);
- add_interrupt_bench(cycles);
- diff -Nur linux-4.1.39.orig/drivers/clk/at91/pmc.c linux-4.1.39/drivers/clk/at91/pmc.c
- --- linux-4.1.39.orig/drivers/clk/at91/pmc.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/clk/at91/pmc.c 2017-04-18 17:56:30.577395735 +0200
- @@ -27,21 +27,6 @@
- void __iomem *at91_pmc_base;
- EXPORT_SYMBOL_GPL(at91_pmc_base);
-
- -void at91rm9200_idle(void)
- -{
- - /*
- - * Disable the processor clock. The processor will be automatically
- - * re-enabled by an interrupt or by a reset.
- - */
- - at91_pmc_write(AT91_PMC_SCDR, AT91_PMC_PCK);
- -}
- -
- -void at91sam9_idle(void)
- -{
- - at91_pmc_write(AT91_PMC_SCDR, AT91_PMC_PCK);
- - cpu_do_idle();
- -}
- -
- int of_at91_get_clk_range(struct device_node *np, const char *propname,
- struct clk_range *range)
- {
- diff -Nur linux-4.1.39.orig/drivers/clocksource/tcb_clksrc.c linux-4.1.39/drivers/clocksource/tcb_clksrc.c
- --- linux-4.1.39.orig/drivers/clocksource/tcb_clksrc.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/clocksource/tcb_clksrc.c 2017-04-18 17:56:30.577395735 +0200
- @@ -23,8 +23,7 @@
- * this 32 bit free-running counter. the second channel is not used.
- *
- * - The third channel may be used to provide a 16-bit clockevent
- - * source, used in either periodic or oneshot mode. This runs
- - * at 32 KiHZ, and can handle delays of up to two seconds.
- + * source, used in either periodic or oneshot mode.
- *
- * A boot clocksource and clockevent source are also currently needed,
- * unless the relevant platforms (ARM/AT91, AVR32/AT32) are changed so
- @@ -74,6 +73,7 @@
- struct tc_clkevt_device {
- struct clock_event_device clkevt;
- struct clk *clk;
- + u32 freq;
- void __iomem *regs;
- };
-
- @@ -82,13 +82,6 @@
- return container_of(clkevt, struct tc_clkevt_device, clkevt);
- }
-
- -/* For now, we always use the 32K clock ... this optimizes for NO_HZ,
- - * because using one of the divided clocks would usually mean the
- - * tick rate can never be less than several dozen Hz (vs 0.5 Hz).
- - *
- - * A divided clock could be good for high resolution timers, since
- - * 30.5 usec resolution can seem "low".
- - */
- static u32 timer_clock;
-
- static void tc_mode(enum clock_event_mode m, struct clock_event_device *d)
- @@ -111,11 +104,12 @@
- case CLOCK_EVT_MODE_PERIODIC:
- clk_enable(tcd->clk);
-
- - /* slow clock, count up to RC, then irq and restart */
- + /* count up to RC, then irq and restart */
- __raw_writel(timer_clock
- | ATMEL_TC_WAVE | ATMEL_TC_WAVESEL_UP_AUTO,
- regs + ATMEL_TC_REG(2, CMR));
- - __raw_writel((32768 + HZ/2) / HZ, tcaddr + ATMEL_TC_REG(2, RC));
- + __raw_writel((tcd->freq + HZ / 2) / HZ,
- + tcaddr + ATMEL_TC_REG(2, RC));
-
- /* Enable clock and interrupts on RC compare */
- __raw_writel(ATMEL_TC_CPCS, regs + ATMEL_TC_REG(2, IER));
- @@ -128,7 +122,7 @@
- case CLOCK_EVT_MODE_ONESHOT:
- clk_enable(tcd->clk);
-
- - /* slow clock, count up to RC, then irq and stop */
- + /* count up to RC, then irq and stop */
- __raw_writel(timer_clock | ATMEL_TC_CPCSTOP
- | ATMEL_TC_WAVE | ATMEL_TC_WAVESEL_UP_AUTO,
- regs + ATMEL_TC_REG(2, CMR));
- @@ -157,8 +151,12 @@
- .name = "tc_clkevt",
- .features = CLOCK_EVT_FEAT_PERIODIC
- | CLOCK_EVT_FEAT_ONESHOT,
- +#ifdef CONFIG_ATMEL_TCB_CLKSRC_USE_SLOW_CLOCK
- /* Should be lower than at91rm9200's system timer */
- .rating = 125,
- +#else
- + .rating = 200,
- +#endif
- .set_next_event = tc_next_event,
- .set_mode = tc_mode,
- },
- @@ -178,8 +176,9 @@
- return IRQ_NONE;
- }
-
- -static int __init setup_clkevents(struct atmel_tc *tc, int clk32k_divisor_idx)
- +static int __init setup_clkevents(struct atmel_tc *tc, int divisor_idx)
- {
- + unsigned divisor = atmel_tc_divisors[divisor_idx];
- int ret;
- struct clk *t2_clk = tc->clk[2];
- int irq = tc->irq[2];
- @@ -193,7 +192,11 @@
- clkevt.regs = tc->regs;
- clkevt.clk = t2_clk;
-
- - timer_clock = clk32k_divisor_idx;
- + timer_clock = divisor_idx;
- + if (!divisor)
- + clkevt.freq = 32768;
- + else
- + clkevt.freq = clk_get_rate(t2_clk) / divisor;
-
- clkevt.clkevt.cpumask = cpumask_of(0);
-
- @@ -203,7 +206,7 @@
- return ret;
- }
-
- - clockevents_config_and_register(&clkevt.clkevt, 32768, 1, 0xffff);
- + clockevents_config_and_register(&clkevt.clkevt, clkevt.freq, 1, 0xffff);
-
- return ret;
- }
- @@ -340,7 +343,11 @@
- goto err_disable_t1;
-
- /* channel 2: periodic and oneshot timer support */
- +#ifdef CONFIG_ATMEL_TCB_CLKSRC_USE_SLOW_CLOCK
- ret = setup_clkevents(tc, clk32k_divisor_idx);
- +#else
- + ret = setup_clkevents(tc, best_divisor_idx);
- +#endif
- if (ret)
- goto err_unregister_clksrc;
-
- diff -Nur linux-4.1.39.orig/drivers/clocksource/timer-atmel-pit.c linux-4.1.39/drivers/clocksource/timer-atmel-pit.c
- --- linux-4.1.39.orig/drivers/clocksource/timer-atmel-pit.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/clocksource/timer-atmel-pit.c 2017-04-18 17:56:30.577395735 +0200
- @@ -90,6 +90,7 @@
- return elapsed;
- }
-
- +static struct irqaction at91sam926x_pit_irq;
- /*
- * Clockevent device: interrupts every 1/HZ (== pit_cycles * MCK/16)
- */
- @@ -100,6 +101,8 @@
-
- switch (mode) {
- case CLOCK_EVT_MODE_PERIODIC:
- + /* Set up irq handler */
- + setup_irq(at91sam926x_pit_irq.irq, &at91sam926x_pit_irq);
- /* update clocksource counter */
- data->cnt += data->cycle * PIT_PICNT(pit_read(data->base, AT91_PIT_PIVR));
- pit_write(data->base, AT91_PIT_MR,
- @@ -113,6 +116,7 @@
- /* disable irq, leaving the clocksource active */
- pit_write(data->base, AT91_PIT_MR,
- (data->cycle - 1) | AT91_PIT_PITEN);
- + remove_irq(at91sam926x_pit_irq.irq, &at91sam926x_pit_irq);
- break;
- case CLOCK_EVT_MODE_RESUME:
- break;
- diff -Nur linux-4.1.39.orig/drivers/clocksource/timer-atmel-st.c linux-4.1.39/drivers/clocksource/timer-atmel-st.c
- --- linux-4.1.39.orig/drivers/clocksource/timer-atmel-st.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/clocksource/timer-atmel-st.c 2017-04-18 17:56:30.577395735 +0200
- @@ -131,6 +131,7 @@
- break;
- case CLOCK_EVT_MODE_SHUTDOWN:
- case CLOCK_EVT_MODE_UNUSED:
- + remove_irq(NR_IRQS_LEGACY + AT91_ID_SYS, &at91rm9200_timer_irq);
- case CLOCK_EVT_MODE_RESUME:
- irqmask = 0;
- break;
- diff -Nur linux-4.1.39.orig/drivers/cpufreq/cpufreq.c linux-4.1.39/drivers/cpufreq/cpufreq.c
- --- linux-4.1.39.orig/drivers/cpufreq/cpufreq.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/cpufreq/cpufreq.c 2017-04-18 17:56:30.577395735 +0200
- @@ -64,12 +64,6 @@
- return cpufreq_driver->target_index || cpufreq_driver->target;
- }
-
- -/*
- - * rwsem to guarantee that cpufreq driver module doesn't unload during critical
- - * sections
- - */
- -static DECLARE_RWSEM(cpufreq_rwsem);
- -
- /* internal prototypes */
- static int __cpufreq_governor(struct cpufreq_policy *policy,
- unsigned int event);
- @@ -215,9 +209,6 @@
- if (cpu >= nr_cpu_ids)
- return NULL;
-
- - if (!down_read_trylock(&cpufreq_rwsem))
- - return NULL;
- -
- /* get the cpufreq driver */
- read_lock_irqsave(&cpufreq_driver_lock, flags);
-
- @@ -230,9 +221,6 @@
-
- read_unlock_irqrestore(&cpufreq_driver_lock, flags);
-
- - if (!policy)
- - up_read(&cpufreq_rwsem);
- -
- return policy;
- }
- EXPORT_SYMBOL_GPL(cpufreq_cpu_get);
- @@ -240,7 +228,6 @@
- void cpufreq_cpu_put(struct cpufreq_policy *policy)
- {
- kobject_put(&policy->kobj);
- - up_read(&cpufreq_rwsem);
- }
- EXPORT_SYMBOL_GPL(cpufreq_cpu_put);
-
- @@ -765,9 +752,6 @@
- struct freq_attr *fattr = to_attr(attr);
- ssize_t ret;
-
- - if (!down_read_trylock(&cpufreq_rwsem))
- - return -EINVAL;
- -
- down_read(&policy->rwsem);
-
- if (fattr->show)
- @@ -776,7 +760,6 @@
- ret = -EIO;
-
- up_read(&policy->rwsem);
- - up_read(&cpufreq_rwsem);
-
- return ret;
- }
- @@ -793,9 +776,6 @@
- if (!cpu_online(policy->cpu))
- goto unlock;
-
- - if (!down_read_trylock(&cpufreq_rwsem))
- - goto unlock;
- -
- down_write(&policy->rwsem);
-
- if (fattr->store)
- @@ -804,8 +784,6 @@
- ret = -EIO;
-
- up_write(&policy->rwsem);
- -
- - up_read(&cpufreq_rwsem);
- unlock:
- put_online_cpus();
-
- @@ -1117,16 +1095,12 @@
- if (unlikely(policy))
- return 0;
-
- - if (!down_read_trylock(&cpufreq_rwsem))
- - return 0;
- -
- /* Check if this cpu was hot-unplugged earlier and has siblings */
- read_lock_irqsave(&cpufreq_driver_lock, flags);
- for_each_policy(policy) {
- if (cpumask_test_cpu(cpu, policy->related_cpus)) {
- read_unlock_irqrestore(&cpufreq_driver_lock, flags);
- ret = cpufreq_add_policy_cpu(policy, cpu, dev);
- - up_read(&cpufreq_rwsem);
- return ret;
- }
- }
- @@ -1269,8 +1243,6 @@
-
- kobject_uevent(&policy->kobj, KOBJ_ADD);
-
- - up_read(&cpufreq_rwsem);
- -
- /* Callback for handling stuff after policy is ready */
- if (cpufreq_driver->ready)
- cpufreq_driver->ready(policy);
- @@ -1304,8 +1276,6 @@
- cpufreq_policy_free(policy);
-
- nomem_out:
- - up_read(&cpufreq_rwsem);
- -
- return ret;
- }
-
- @@ -2499,19 +2469,20 @@
-
- pr_debug("unregistering driver %s\n", driver->name);
-
- + /* Protect against concurrent cpu hotplug */
- + get_online_cpus();
- subsys_interface_unregister(&cpufreq_interface);
- if (cpufreq_boost_supported())
- cpufreq_sysfs_remove_file(&boost.attr);
-
- unregister_hotcpu_notifier(&cpufreq_cpu_notifier);
-
- - down_write(&cpufreq_rwsem);
- write_lock_irqsave(&cpufreq_driver_lock, flags);
-
- cpufreq_driver = NULL;
-
- write_unlock_irqrestore(&cpufreq_driver_lock, flags);
- - up_write(&cpufreq_rwsem);
- + put_online_cpus();
-
- return 0;
- }
- diff -Nur linux-4.1.39.orig/drivers/cpufreq/Kconfig.x86 linux-4.1.39/drivers/cpufreq/Kconfig.x86
- --- linux-4.1.39.orig/drivers/cpufreq/Kconfig.x86 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/cpufreq/Kconfig.x86 2017-04-18 17:56:30.577395735 +0200
- @@ -123,7 +123,7 @@
-
- config X86_POWERNOW_K8
- tristate "AMD Opteron/Athlon64 PowerNow!"
- - depends on ACPI && ACPI_PROCESSOR && X86_ACPI_CPUFREQ
- + depends on ACPI && ACPI_PROCESSOR && X86_ACPI_CPUFREQ && !PREEMPT_RT_BASE
- help
- This adds the CPUFreq driver for K8/early Opteron/Athlon64 processors.
- Support for K10 and newer processors is now in acpi-cpufreq.
- diff -Nur linux-4.1.39.orig/drivers/gpio/gpio-omap.c linux-4.1.39/drivers/gpio/gpio-omap.c
- --- linux-4.1.39.orig/drivers/gpio/gpio-omap.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/gpio/gpio-omap.c 2017-04-18 17:56:30.577395735 +0200
- @@ -29,6 +29,7 @@
- #include <linux/platform_data/gpio-omap.h>
-
- #define OFF_MODE 1
- +#define OMAP4_GPIO_DEBOUNCINGTIME_MASK 0xFF
-
- static LIST_HEAD(omap_gpio_list);
-
- @@ -50,14 +51,15 @@
- struct gpio_bank {
- struct list_head node;
- void __iomem *base;
- - u16 irq;
- + int irq;
- u32 non_wakeup_gpios;
- u32 enabled_non_wakeup_gpios;
- struct gpio_regs context;
- u32 saved_datain;
- u32 level_mask;
- u32 toggle_mask;
- - spinlock_t lock;
- + raw_spinlock_t lock;
- + raw_spinlock_t wa_lock;
- struct gpio_chip chip;
- struct clk *dbck;
- u32 mod_usage;
- @@ -67,7 +69,7 @@
- struct device *dev;
- bool is_mpuio;
- bool dbck_flag;
- - bool loses_context;
- +
- bool context_valid;
- int stride;
- u32 width;
- @@ -175,7 +177,7 @@
- static inline void omap_gpio_dbck_enable(struct gpio_bank *bank)
- {
- if (bank->dbck_enable_mask && !bank->dbck_enabled) {
- - clk_prepare_enable(bank->dbck);
- + clk_enable(bank->dbck);
- bank->dbck_enabled = true;
-
- writel_relaxed(bank->dbck_enable_mask,
- @@ -193,7 +195,7 @@
- */
- writel_relaxed(0, bank->base + bank->regs->debounce_en);
-
- - clk_disable_unprepare(bank->dbck);
- + clk_disable(bank->dbck);
- bank->dbck_enabled = false;
- }
- }
- @@ -204,8 +206,9 @@
- * @offset: the gpio number on this @bank
- * @debounce: debounce time to use
- *
- - * OMAP's debounce time is in 31us steps so we need
- - * to convert and round up to the closest unit.
- + * OMAP's debounce time is in 31us steps
- + * <debounce time> = (GPIO_DEBOUNCINGTIME[7:0].DEBOUNCETIME + 1) x 31
- + * so we need to convert and round up to the closest unit.
- */
- static void omap2_set_gpio_debounce(struct gpio_bank *bank, unsigned offset,
- unsigned debounce)
- @@ -213,34 +216,33 @@
- void __iomem *reg;
- u32 val;
- u32 l;
- + bool enable = !!debounce;
-
- if (!bank->dbck_flag)
- return;
-
- - if (debounce < 32)
- - debounce = 0x01;
- - else if (debounce > 7936)
- - debounce = 0xff;
- - else
- - debounce = (debounce / 0x1f) - 1;
- + if (enable) {
- + debounce = DIV_ROUND_UP(debounce, 31) - 1;
- + debounce &= OMAP4_GPIO_DEBOUNCINGTIME_MASK;
- + }
-
- l = BIT(offset);
-
- - clk_prepare_enable(bank->dbck);
- + clk_enable(bank->dbck);
- reg = bank->base + bank->regs->debounce;
- writel_relaxed(debounce, reg);
-
- reg = bank->base + bank->regs->debounce_en;
- val = readl_relaxed(reg);
-
- - if (debounce)
- + if (enable)
- val |= l;
- else
- val &= ~l;
- bank->dbck_enable_mask = val;
-
- writel_relaxed(val, reg);
- - clk_disable_unprepare(bank->dbck);
- + clk_disable(bank->dbck);
- /*
- * Enable debounce clock per module.
- * This call is mandatory because in omap_gpio_request() when
- @@ -285,7 +287,7 @@
- bank->context.debounce = 0;
- writel_relaxed(bank->context.debounce, bank->base +
- bank->regs->debounce);
- - clk_disable_unprepare(bank->dbck);
- + clk_disable(bank->dbck);
- bank->dbck_enabled = false;
- }
- }
- @@ -488,9 +490,6 @@
- unsigned long flags;
- unsigned offset = d->hwirq;
-
- - if (!BANK_USED(bank))
- - pm_runtime_get_sync(bank->dev);
- -
- if (type & ~IRQ_TYPE_SENSE_MASK)
- return -EINVAL;
-
- @@ -498,20 +497,28 @@
- (type & (IRQ_TYPE_LEVEL_LOW|IRQ_TYPE_LEVEL_HIGH)))
- return -EINVAL;
-
- - spin_lock_irqsave(&bank->lock, flags);
- + raw_spin_lock_irqsave(&bank->lock, flags);
- retval = omap_set_gpio_triggering(bank, offset, type);
- + if (retval) {
- + raw_spin_unlock_irqrestore(&bank->lock, flags);
- + goto error;
- + }
- omap_gpio_init_irq(bank, offset);
- if (!omap_gpio_is_input(bank, offset)) {
- - spin_unlock_irqrestore(&bank->lock, flags);
- - return -EINVAL;
- + raw_spin_unlock_irqrestore(&bank->lock, flags);
- + retval = -EINVAL;
- + goto error;
- }
- - spin_unlock_irqrestore(&bank->lock, flags);
- + raw_spin_unlock_irqrestore(&bank->lock, flags);
-
- if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
- __irq_set_handler_locked(d->irq, handle_level_irq);
- else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
- __irq_set_handler_locked(d->irq, handle_edge_irq);
-
- + return 0;
- +
- +error:
- return retval;
- }
-
- @@ -626,34 +633,30 @@
- return -EINVAL;
- }
-
- - spin_lock_irqsave(&bank->lock, flags);
- + raw_spin_lock_irqsave(&bank->lock, flags);
- if (enable)
- bank->context.wake_en |= gpio_bit;
- else
- bank->context.wake_en &= ~gpio_bit;
-
- writel_relaxed(bank->context.wake_en, bank->base + bank->regs->wkup_en);
- - spin_unlock_irqrestore(&bank->lock, flags);
- + raw_spin_unlock_irqrestore(&bank->lock, flags);
-
- return 0;
- }
-
- -static void omap_reset_gpio(struct gpio_bank *bank, unsigned offset)
- -{
- - omap_set_gpio_direction(bank, offset, 1);
- - omap_set_gpio_irqenable(bank, offset, 0);
- - omap_clear_gpio_irqstatus(bank, offset);
- - omap_set_gpio_triggering(bank, offset, IRQ_TYPE_NONE);
- - omap_clear_gpio_debounce(bank, offset);
- -}
- -
- /* Use disable_irq_wake() and enable_irq_wake() functions from drivers */
- static int omap_gpio_wake_enable(struct irq_data *d, unsigned int enable)
- {
- struct gpio_bank *bank = omap_irq_data_get_bank(d);
- unsigned offset = d->hwirq;
- + int ret;
- +
- + ret = omap_set_gpio_wakeup(bank, offset, enable);
- + if (!ret)
- + ret = irq_set_irq_wake(bank->irq, enable);
-
- - return omap_set_gpio_wakeup(bank, offset, enable);
- + return ret;
- }
-
- static int omap_gpio_request(struct gpio_chip *chip, unsigned offset)
- @@ -668,17 +671,10 @@
- if (!BANK_USED(bank))
- pm_runtime_get_sync(bank->dev);
-
- - spin_lock_irqsave(&bank->lock, flags);
- - /* Set trigger to none. You need to enable the desired trigger with
- - * request_irq() or set_irq_type(). Only do this if the IRQ line has
- - * not already been requested.
- - */
- - if (!LINE_USED(bank->irq_usage, offset)) {
- - omap_set_gpio_triggering(bank, offset, IRQ_TYPE_NONE);
- - omap_enable_gpio_module(bank, offset);
- - }
- + raw_spin_lock_irqsave(&bank->lock, flags);
- + omap_enable_gpio_module(bank, offset);
- bank->mod_usage |= BIT(offset);
- - spin_unlock_irqrestore(&bank->lock, flags);
- + raw_spin_unlock_irqrestore(&bank->lock, flags);
-
- return 0;
- }
- @@ -688,11 +684,14 @@
- struct gpio_bank *bank = container_of(chip, struct gpio_bank, chip);
- unsigned long flags;
-
- - spin_lock_irqsave(&bank->lock, flags);
- + raw_spin_lock_irqsave(&bank->lock, flags);
- bank->mod_usage &= ~(BIT(offset));
- + if (!LINE_USED(bank->irq_usage, offset)) {
- + omap_set_gpio_direction(bank, offset, 1);
- + omap_clear_gpio_debounce(bank, offset);
- + }
- omap_disable_gpio_module(bank, offset);
- - omap_reset_gpio(bank, offset);
- - spin_unlock_irqrestore(&bank->lock, flags);
- + raw_spin_unlock_irqrestore(&bank->lock, flags);
-
- /*
- * If this is the last gpio to be freed in the bank,
- @@ -711,29 +710,27 @@
- * line's interrupt handler has been run, we may miss some nested
- * interrupts.
- */
- -static void omap_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
- +static irqreturn_t omap_gpio_irq_handler(int irq, void *gpiobank)
- {
- void __iomem *isr_reg = NULL;
- u32 isr;
- unsigned int bit;
- - struct gpio_bank *bank;
- - int unmasked = 0;
- - struct irq_chip *irqchip = irq_desc_get_chip(desc);
- - struct gpio_chip *chip = irq_get_handler_data(irq);
- + struct gpio_bank *bank = gpiobank;
- + unsigned long wa_lock_flags;
- + unsigned long lock_flags;
-
- - chained_irq_enter(irqchip, desc);
- -
- - bank = container_of(chip, struct gpio_bank, chip);
- isr_reg = bank->base + bank->regs->irqstatus;
- - pm_runtime_get_sync(bank->dev);
- -
- if (WARN_ON(!isr_reg))
- goto exit;
-
- + pm_runtime_get_sync(bank->dev);
- +
- while (1) {
- u32 isr_saved, level_mask = 0;
- u32 enabled;
-
- + raw_spin_lock_irqsave(&bank->lock, lock_flags);
- +
- enabled = omap_get_gpio_irqbank_mask(bank);
- isr_saved = isr = readl_relaxed(isr_reg) & enabled;
-
- @@ -747,12 +744,7 @@
- omap_clear_gpio_irqbank(bank, isr_saved & ~level_mask);
- omap_enable_gpio_irqbank(bank, isr_saved & ~level_mask);
-
- - /* if there is only edge sensitive GPIO pin interrupts
- - configured, we could unmask GPIO bank interrupt immediately */
- - if (!level_mask && !unmasked) {
- - unmasked = 1;
- - chained_irq_exit(irqchip, desc);
- - }
- + raw_spin_unlock_irqrestore(&bank->lock, lock_flags);
-
- if (!isr)
- break;
- @@ -761,6 +753,7 @@
- bit = __ffs(isr);
- isr &= ~(BIT(bit));
-
- + raw_spin_lock_irqsave(&bank->lock, lock_flags);
- /*
- * Some chips can't respond to both rising and falling
- * at the same time. If this irq was requested with
- @@ -771,18 +764,20 @@
- if (bank->toggle_mask & (BIT(bit)))
- omap_toggle_gpio_edge_triggering(bank, bit);
-
- + raw_spin_unlock_irqrestore(&bank->lock, lock_flags);
- +
- + raw_spin_lock_irqsave(&bank->wa_lock, wa_lock_flags);
- +
- generic_handle_irq(irq_find_mapping(bank->chip.irqdomain,
- bit));
- +
- + raw_spin_unlock_irqrestore(&bank->wa_lock,
- + wa_lock_flags);
- }
- }
- - /* if bank has any level sensitive GPIO pin interrupt
- - configured, we must unmask the bank interrupt only after
- - handler(s) are executed in order to avoid spurious bank
- - interrupt */
- exit:
- - if (!unmasked)
- - chained_irq_exit(irqchip, desc);
- pm_runtime_put(bank->dev);
- + return IRQ_HANDLED;
- }
-
- static unsigned int omap_gpio_irq_startup(struct irq_data *d)
- @@ -791,15 +786,22 @@
- unsigned long flags;
- unsigned offset = d->hwirq;
-
- - if (!BANK_USED(bank))
- - pm_runtime_get_sync(bank->dev);
- + raw_spin_lock_irqsave(&bank->lock, flags);
-
- - spin_lock_irqsave(&bank->lock, flags);
- - omap_gpio_init_irq(bank, offset);
- - spin_unlock_irqrestore(&bank->lock, flags);
- + if (!LINE_USED(bank->mod_usage, offset))
- + omap_set_gpio_direction(bank, offset, 1);
- + else if (!omap_gpio_is_input(bank, offset))
- + goto err;
- + omap_enable_gpio_module(bank, offset);
- + bank->irq_usage |= BIT(offset);
- +
- + raw_spin_unlock_irqrestore(&bank->lock, flags);
- omap_gpio_unmask_irq(d);
-
- return 0;
- +err:
- + raw_spin_unlock_irqrestore(&bank->lock, flags);
- + return -EINVAL;
- }
-
- static void omap_gpio_irq_shutdown(struct irq_data *d)
- @@ -808,11 +810,28 @@
- unsigned long flags;
- unsigned offset = d->hwirq;
-
- - spin_lock_irqsave(&bank->lock, flags);
- + raw_spin_lock_irqsave(&bank->lock, flags);
- bank->irq_usage &= ~(BIT(offset));
- + omap_set_gpio_irqenable(bank, offset, 0);
- + omap_clear_gpio_irqstatus(bank, offset);
- + omap_set_gpio_triggering(bank, offset, IRQ_TYPE_NONE);
- + if (!LINE_USED(bank->mod_usage, offset))
- + omap_clear_gpio_debounce(bank, offset);
- omap_disable_gpio_module(bank, offset);
- - omap_reset_gpio(bank, offset);
- - spin_unlock_irqrestore(&bank->lock, flags);
- + raw_spin_unlock_irqrestore(&bank->lock, flags);
- +}
- +
- +static void omap_gpio_irq_bus_lock(struct irq_data *data)
- +{
- + struct gpio_bank *bank = omap_irq_data_get_bank(data);
- +
- + if (!BANK_USED(bank))
- + pm_runtime_get_sync(bank->dev);
- +}
- +
- +static void gpio_irq_bus_sync_unlock(struct irq_data *data)
- +{
- + struct gpio_bank *bank = omap_irq_data_get_bank(data);
-
- /*
- * If this is the last IRQ to be freed in the bank,
- @@ -836,10 +855,10 @@
- unsigned offset = d->hwirq;
- unsigned long flags;
-
- - spin_lock_irqsave(&bank->lock, flags);
- + raw_spin_lock_irqsave(&bank->lock, flags);
- omap_set_gpio_irqenable(bank, offset, 0);
- omap_set_gpio_triggering(bank, offset, IRQ_TYPE_NONE);
- - spin_unlock_irqrestore(&bank->lock, flags);
- + raw_spin_unlock_irqrestore(&bank->lock, flags);
- }
-
- static void omap_gpio_unmask_irq(struct irq_data *d)
- @@ -849,7 +868,7 @@
- u32 trigger = irqd_get_trigger_type(d);
- unsigned long flags;
-
- - spin_lock_irqsave(&bank->lock, flags);
- + raw_spin_lock_irqsave(&bank->lock, flags);
- if (trigger)
- omap_set_gpio_triggering(bank, offset, trigger);
-
- @@ -861,7 +880,7 @@
- }
-
- omap_set_gpio_irqenable(bank, offset, 1);
- - spin_unlock_irqrestore(&bank->lock, flags);
- + raw_spin_unlock_irqrestore(&bank->lock, flags);
- }
-
- /*---------------------------------------------------------------------*/
- @@ -874,9 +893,9 @@
- OMAP_MPUIO_GPIO_MASKIT / bank->stride;
- unsigned long flags;
-
- - spin_lock_irqsave(&bank->lock, flags);
- + raw_spin_lock_irqsave(&bank->lock, flags);
- writel_relaxed(0xffff & ~bank->context.wake_en, mask_reg);
- - spin_unlock_irqrestore(&bank->lock, flags);
- + raw_spin_unlock_irqrestore(&bank->lock, flags);
-
- return 0;
- }
- @@ -889,9 +908,9 @@
- OMAP_MPUIO_GPIO_MASKIT / bank->stride;
- unsigned long flags;
-
- - spin_lock_irqsave(&bank->lock, flags);
- + raw_spin_lock_irqsave(&bank->lock, flags);
- writel_relaxed(bank->context.wake_en, mask_reg);
- - spin_unlock_irqrestore(&bank->lock, flags);
- + raw_spin_unlock_irqrestore(&bank->lock, flags);
-
- return 0;
- }
- @@ -937,9 +956,9 @@
-
- bank = container_of(chip, struct gpio_bank, chip);
- reg = bank->base + bank->regs->direction;
- - spin_lock_irqsave(&bank->lock, flags);
- + raw_spin_lock_irqsave(&bank->lock, flags);
- dir = !!(readl_relaxed(reg) & BIT(offset));
- - spin_unlock_irqrestore(&bank->lock, flags);
- + raw_spin_unlock_irqrestore(&bank->lock, flags);
- return dir;
- }
-
- @@ -949,9 +968,9 @@
- unsigned long flags;
-
- bank = container_of(chip, struct gpio_bank, chip);
- - spin_lock_irqsave(&bank->lock, flags);
- + raw_spin_lock_irqsave(&bank->lock, flags);
- omap_set_gpio_direction(bank, offset, 1);
- - spin_unlock_irqrestore(&bank->lock, flags);
- + raw_spin_unlock_irqrestore(&bank->lock, flags);
- return 0;
- }
-
- @@ -973,10 +992,10 @@
- unsigned long flags;
-
- bank = container_of(chip, struct gpio_bank, chip);
- - spin_lock_irqsave(&bank->lock, flags);
- + raw_spin_lock_irqsave(&bank->lock, flags);
- bank->set_dataout(bank, offset, value);
- omap_set_gpio_direction(bank, offset, 0);
- - spin_unlock_irqrestore(&bank->lock, flags);
- + raw_spin_unlock_irqrestore(&bank->lock, flags);
- return 0;
- }
-
- @@ -988,9 +1007,9 @@
-
- bank = container_of(chip, struct gpio_bank, chip);
-
- - spin_lock_irqsave(&bank->lock, flags);
- + raw_spin_lock_irqsave(&bank->lock, flags);
- omap2_set_gpio_debounce(bank, offset, debounce);
- - spin_unlock_irqrestore(&bank->lock, flags);
- + raw_spin_unlock_irqrestore(&bank->lock, flags);
-
- return 0;
- }
- @@ -1001,9 +1020,9 @@
- unsigned long flags;
-
- bank = container_of(chip, struct gpio_bank, chip);
- - spin_lock_irqsave(&bank->lock, flags);
- + raw_spin_lock_irqsave(&bank->lock, flags);
- bank->set_dataout(bank, offset, value);
- - spin_unlock_irqrestore(&bank->lock, flags);
- + raw_spin_unlock_irqrestore(&bank->lock, flags);
- }
-
- /*---------------------------------------------------------------------*/
- @@ -1048,10 +1067,6 @@
- /* Initialize interface clk ungated, module enabled */
- if (bank->regs->ctrl)
- writel_relaxed(0, base + bank->regs->ctrl);
- -
- - bank->dbck = clk_get(bank->dev, "dbclk");
- - if (IS_ERR(bank->dbck))
- - dev_err(bank->dev, "Could not get gpio dbck\n");
- }
-
- static int omap_gpio_chip_init(struct gpio_bank *bank, struct irq_chip *irqc)
- @@ -1080,7 +1095,6 @@
- } else {
- bank->chip.label = "gpio";
- bank->chip.base = gpio;
- - gpio += bank->width;
- }
- bank->chip.ngpio = bank->width;
-
- @@ -1090,6 +1104,9 @@
- return ret;
- }
-
- + if (!bank->is_mpuio)
- + gpio += bank->width;
- +
- #ifdef CONFIG_ARCH_OMAP1
- /*
- * REVISIT: Once we have OMAP1 supporting SPARSE_IRQ, we can drop
- @@ -1112,7 +1129,7 @@
- }
-
- ret = gpiochip_irqchip_add(&bank->chip, irqc,
- - irq_base, omap_gpio_irq_handler,
- + irq_base, handle_bad_irq,
- IRQ_TYPE_NONE);
-
- if (ret) {
- @@ -1121,10 +1138,14 @@
- return -ENODEV;
- }
-
- - gpiochip_set_chained_irqchip(&bank->chip, irqc,
- - bank->irq, omap_gpio_irq_handler);
- + gpiochip_set_chained_irqchip(&bank->chip, irqc, bank->irq, NULL);
-
- - return 0;
- + ret = devm_request_irq(bank->dev, bank->irq, omap_gpio_irq_handler,
- + 0, dev_name(bank->dev), bank);
- + if (ret)
- + gpiochip_remove(&bank->chip);
- +
- + return ret;
- }
-
- static const struct of_device_id omap_gpio_match[];
- @@ -1163,17 +1184,23 @@
- irqc->irq_unmask = omap_gpio_unmask_irq,
- irqc->irq_set_type = omap_gpio_irq_type,
- irqc->irq_set_wake = omap_gpio_wake_enable,
- + irqc->irq_bus_lock = omap_gpio_irq_bus_lock,
- + irqc->irq_bus_sync_unlock = gpio_irq_bus_sync_unlock,
- irqc->name = dev_name(&pdev->dev);
-
- - res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
- - if (unlikely(!res)) {
- - dev_err(dev, "Invalid IRQ resource\n");
- - return -ENODEV;
- + bank->irq = platform_get_irq(pdev, 0);
- + if (bank->irq <= 0) {
- + if (!bank->irq)
- + bank->irq = -ENXIO;
- + if (bank->irq != -EPROBE_DEFER)
- + dev_err(dev,
- + "can't get irq resource ret=%d\n", bank->irq);
- + return bank->irq;
- }
-
- - bank->irq = res->start;
- bank->dev = dev;
- bank->chip.dev = dev;
- + bank->chip.owner = THIS_MODULE;
- bank->dbck_flag = pdata->dbck_flag;
- bank->stride = pdata->bank_stride;
- bank->width = pdata->bank_width;
- @@ -1183,15 +1210,9 @@
- #ifdef CONFIG_OF_GPIO
- bank->chip.of_node = of_node_get(node);
- #endif
- - if (node) {
- - if (!of_property_read_bool(node, "ti,gpio-always-on"))
- - bank->loses_context = true;
- - } else {
- - bank->loses_context = pdata->loses_context;
- -
- - if (bank->loses_context)
- - bank->get_context_loss_count =
- - pdata->get_context_loss_count;
- + if (!node) {
- + bank->get_context_loss_count =
- + pdata->get_context_loss_count;
- }
-
- if (bank->regs->set_dataout && bank->regs->clr_dataout)
- @@ -1199,16 +1220,27 @@
- else
- bank->set_dataout = omap_set_gpio_dataout_mask;
-
- - spin_lock_init(&bank->lock);
- + raw_spin_lock_init(&bank->lock);
- + raw_spin_lock_init(&bank->wa_lock);
-
- /* Static mapping, never released */
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- bank->base = devm_ioremap_resource(dev, res);
- if (IS_ERR(bank->base)) {
- - irq_domain_remove(bank->chip.irqdomain);
- return PTR_ERR(bank->base);
- }
-
- + if (bank->dbck_flag) {
- + bank->dbck = devm_clk_get(bank->dev, "dbclk");
- + if (IS_ERR(bank->dbck)) {
- + dev_err(bank->dev,
- + "Could not get gpio dbck. Disable debounce\n");
- + bank->dbck_flag = false;
- + } else {
- + clk_prepare(bank->dbck);
- + }
- + }
- +
- platform_set_drvdata(pdev, bank);
-
- pm_runtime_enable(bank->dev);
- @@ -1221,8 +1253,11 @@
- omap_gpio_mod_init(bank);
-
- ret = omap_gpio_chip_init(bank, irqc);
- - if (ret)
- + if (ret) {
- + pm_runtime_put_sync(bank->dev);
- + pm_runtime_disable(bank->dev);
- return ret;
- + }
-
- omap_gpio_show_rev(bank);
-
- @@ -1233,6 +1268,19 @@
- return 0;
- }
-
- +static int omap_gpio_remove(struct platform_device *pdev)
- +{
- + struct gpio_bank *bank = platform_get_drvdata(pdev);
- +
- + list_del(&bank->node);
- + gpiochip_remove(&bank->chip);
- + pm_runtime_disable(bank->dev);
- + if (bank->dbck_flag)
- + clk_unprepare(bank->dbck);
- +
- + return 0;
- +}
- +
- #ifdef CONFIG_ARCH_OMAP2PLUS
-
- #if defined(CONFIG_PM)
- @@ -1246,7 +1294,7 @@
- unsigned long flags;
- u32 wake_low, wake_hi;
-
- - spin_lock_irqsave(&bank->lock, flags);
- + raw_spin_lock_irqsave(&bank->lock, flags);
-
- /*
- * Only edges can generate a wakeup event to the PRCM.
- @@ -1299,7 +1347,7 @@
- bank->get_context_loss_count(bank->dev);
-
- omap_gpio_dbck_disable(bank);
- - spin_unlock_irqrestore(&bank->lock, flags);
- + raw_spin_unlock_irqrestore(&bank->lock, flags);
-
- return 0;
- }
- @@ -1314,14 +1362,14 @@
- unsigned long flags;
- int c;
-
- - spin_lock_irqsave(&bank->lock, flags);
- + raw_spin_lock_irqsave(&bank->lock, flags);
-
- /*
- * On the first resume during the probe, the context has not
- * been initialised and so initialise it now. Also initialise
- * the context loss count.
- */
- - if (bank->loses_context && !bank->context_valid) {
- + if (!bank->context_valid) {
- omap_gpio_init_context(bank);
-
- if (bank->get_context_loss_count)
- @@ -1342,22 +1390,20 @@
- writel_relaxed(bank->context.risingdetect,
- bank->base + bank->regs->risingdetect);
-
- - if (bank->loses_context) {
- - if (!bank->get_context_loss_count) {
- + if (!bank->get_context_loss_count) {
- + omap_gpio_restore_context(bank);
- + } else {
- + c = bank->get_context_loss_count(bank->dev);
- + if (c != bank->context_loss_count) {
- omap_gpio_restore_context(bank);
- } else {
- - c = bank->get_context_loss_count(bank->dev);
- - if (c != bank->context_loss_count) {
- - omap_gpio_restore_context(bank);
- - } else {
- - spin_unlock_irqrestore(&bank->lock, flags);
- - return 0;
- - }
- + raw_spin_unlock_irqrestore(&bank->lock, flags);
- + return 0;
- }
- }
-
- if (!bank->workaround_enabled) {
- - spin_unlock_irqrestore(&bank->lock, flags);
- + raw_spin_unlock_irqrestore(&bank->lock, flags);
- return 0;
- }
-
- @@ -1412,18 +1458,19 @@
- }
-
- bank->workaround_enabled = false;
- - spin_unlock_irqrestore(&bank->lock, flags);
- + raw_spin_unlock_irqrestore(&bank->lock, flags);
-
- return 0;
- }
- #endif /* CONFIG_PM */
-
- +#if IS_BUILTIN(CONFIG_GPIO_OMAP)
- void omap2_gpio_prepare_for_idle(int pwr_mode)
- {
- struct gpio_bank *bank;
-
- list_for_each_entry(bank, &omap_gpio_list, node) {
- - if (!BANK_USED(bank) || !bank->loses_context)
- + if (!BANK_USED(bank))
- continue;
-
- bank->power_mode = pwr_mode;
- @@ -1437,12 +1484,13 @@
- struct gpio_bank *bank;
-
- list_for_each_entry(bank, &omap_gpio_list, node) {
- - if (!BANK_USED(bank) || !bank->loses_context)
- + if (!BANK_USED(bank))
- continue;
-
- pm_runtime_get_sync(bank->dev);
- }
- }
- +#endif
-
- #if defined(CONFIG_PM)
- static void omap_gpio_init_context(struct gpio_bank *p)
- @@ -1598,6 +1646,7 @@
-
- static struct platform_driver omap_gpio_driver = {
- .probe = omap_gpio_probe,
- + .remove = omap_gpio_remove,
- .driver = {
- .name = "omap_gpio",
- .pm = &gpio_pm_ops,
- @@ -1615,3 +1664,13 @@
- return platform_driver_register(&omap_gpio_driver);
- }
- postcore_initcall(omap_gpio_drv_reg);
- +
- +static void __exit omap_gpio_exit(void)
- +{
- + platform_driver_unregister(&omap_gpio_driver);
- +}
- +module_exit(omap_gpio_exit);
- +
- +MODULE_DESCRIPTION("omap gpio driver");
- +MODULE_ALIAS("platform:gpio-omap");
- +MODULE_LICENSE("GPL v2");
- diff -Nur linux-4.1.39.orig/drivers/gpio/Kconfig linux-4.1.39/drivers/gpio/Kconfig
- --- linux-4.1.39.orig/drivers/gpio/Kconfig 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/gpio/Kconfig 2017-04-18 17:56:30.577395735 +0200
- @@ -309,7 +309,7 @@
- family of SOCs.
-
- config GPIO_OMAP
- - bool "TI OMAP GPIO support" if COMPILE_TEST && !ARCH_OMAP2PLUS
- + tristate "TI OMAP GPIO support" if ARCH_OMAP2PLUS || COMPILE_TEST
- default y if ARCH_OMAP
- depends on ARM
- select GENERIC_IRQ_CHIP
- diff -Nur linux-4.1.39.orig/drivers/gpu/drm/i915/i915_gem_execbuffer.c linux-4.1.39/drivers/gpu/drm/i915/i915_gem_execbuffer.c
- --- linux-4.1.39.orig/drivers/gpu/drm/i915/i915_gem_execbuffer.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/gpu/drm/i915/i915_gem_execbuffer.c 2017-04-18 17:56:30.577395735 +0200
- @@ -32,6 +32,7 @@
- #include "i915_trace.h"
- #include "intel_drv.h"
- #include <linux/dma_remapping.h>
- +#include <linux/uaccess.h>
-
- #define __EXEC_OBJECT_HAS_PIN (1<<31)
- #define __EXEC_OBJECT_HAS_FENCE (1<<30)
- @@ -465,7 +466,7 @@
- }
-
- /* We can't wait for rendering with pagefaults disabled */
- - if (obj->active && in_atomic())
- + if (obj->active && pagefault_disabled())
- return -EFAULT;
-
- if (use_cpu_reloc(obj))
- @@ -1338,7 +1339,9 @@
- return ret;
- }
-
- +#ifndef CONFIG_PREEMPT_RT_BASE
- trace_i915_gem_ring_dispatch(intel_ring_get_request(ring), dispatch_flags);
- +#endif
-
- i915_gem_execbuffer_move_to_active(vmas, ring);
- i915_gem_execbuffer_retire_commands(dev, file, ring, batch_obj);
- diff -Nur linux-4.1.39.orig/drivers/gpu/drm/i915/i915_gem_shrinker.c linux-4.1.39/drivers/gpu/drm/i915/i915_gem_shrinker.c
- --- linux-4.1.39.orig/drivers/gpu/drm/i915/i915_gem_shrinker.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/gpu/drm/i915/i915_gem_shrinker.c 2017-04-18 17:56:30.577395735 +0200
- @@ -39,7 +39,7 @@
- if (!mutex_is_locked(mutex))
- return false;
-
- -#if defined(CONFIG_DEBUG_MUTEXES) || defined(CONFIG_MUTEX_SPIN_ON_OWNER)
- +#if (defined(CONFIG_DEBUG_MUTEXES) || defined(CONFIG_MUTEX_SPIN_ON_OWNER)) && !defined(CONFIG_PREEMPT_RT_BASE)
- return mutex->owner == task;
- #else
- /* Since UP may be pre-empted, we cannot assume that we own the lock */
- diff -Nur linux-4.1.39.orig/drivers/gpu/drm/i915/i915_irq.c linux-4.1.39/drivers/gpu/drm/i915/i915_irq.c
- --- linux-4.1.39.orig/drivers/gpu/drm/i915/i915_irq.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/gpu/drm/i915/i915_irq.c 2017-04-18 17:56:30.581395889 +0200
- @@ -676,6 +676,7 @@
- spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
-
- /* preempt_disable_rt() should go right here in PREEMPT_RT patchset. */
- + preempt_disable_rt();
-
- /* Get optional system timestamp before query. */
- if (stime)
- @@ -727,6 +728,7 @@
- *etime = ktime_get();
-
- /* preempt_enable_rt() should go right here in PREEMPT_RT patchset. */
- + preempt_enable_rt();
-
- spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
-
- diff -Nur linux-4.1.39.orig/drivers/gpu/drm/i915/intel_display.c linux-4.1.39/drivers/gpu/drm/i915/intel_display.c
- --- linux-4.1.39.orig/drivers/gpu/drm/i915/intel_display.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/gpu/drm/i915/intel_display.c 2017-04-18 17:56:30.581395889 +0200
- @@ -10084,7 +10084,7 @@
- struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[pipe];
- struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
-
- - WARN_ON(!in_interrupt());
- + WARN_ON_NONRT(!in_interrupt());
-
- if (crtc == NULL)
- return;
- diff -Nur linux-4.1.39.orig/drivers/gpu/drm/i915/intel_sprite.c linux-4.1.39/drivers/gpu/drm/i915/intel_sprite.c
- --- linux-4.1.39.orig/drivers/gpu/drm/i915/intel_sprite.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/gpu/drm/i915/intel_sprite.c 2017-04-18 17:56:30.581395889 +0200
- @@ -37,6 +37,7 @@
- #include "intel_drv.h"
- #include <drm/i915_drm.h>
- #include "i915_drv.h"
- +#include <linux/locallock.h>
-
- static bool
- format_is_yuv(uint32_t format)
- @@ -61,6 +62,8 @@
- return DIV_ROUND_UP(usecs * mode->crtc_clock, 1000 * mode->crtc_htotal);
- }
-
- +static DEFINE_LOCAL_IRQ_LOCK(pipe_update_lock);
- +
- /**
- * intel_pipe_update_start() - start update of a set of display registers
- * @crtc: the crtc of which the registers are going to be updated
- @@ -101,7 +104,7 @@
- if (WARN_ON(drm_crtc_vblank_get(&crtc->base)))
- return false;
-
- - local_irq_disable();
- + local_lock_irq(pipe_update_lock);
-
- trace_i915_pipe_update_start(crtc, min, max);
-
- @@ -123,11 +126,11 @@
- break;
- }
-
- - local_irq_enable();
- + local_unlock_irq(pipe_update_lock);
-
- timeout = schedule_timeout(timeout);
-
- - local_irq_disable();
- + local_lock_irq(pipe_update_lock);
- }
-
- finish_wait(wq, &wait);
- @@ -158,7 +161,7 @@
-
- trace_i915_pipe_update_end(crtc, end_vbl_count);
-
- - local_irq_enable();
- + local_unlock_irq(pipe_update_lock);
-
- if (start_vbl_count != end_vbl_count)
- DRM_ERROR("Atomic update failure on pipe %c (start=%u end=%u)\n",
- diff -Nur linux-4.1.39.orig/drivers/gpu/drm/radeon/radeon_display.c linux-4.1.39/drivers/gpu/drm/radeon/radeon_display.c
- --- linux-4.1.39.orig/drivers/gpu/drm/radeon/radeon_display.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/gpu/drm/radeon/radeon_display.c 2017-04-18 17:56:30.581395889 +0200
- @@ -1798,6 +1798,7 @@
- struct radeon_device *rdev = dev->dev_private;
-
- /* preempt_disable_rt() should go right here in PREEMPT_RT patchset. */
- + preempt_disable_rt();
-
- /* Get optional system timestamp before query. */
- if (stime)
- @@ -1890,6 +1891,7 @@
- *etime = ktime_get();
-
- /* preempt_enable_rt() should go right here in PREEMPT_RT patchset. */
- + preempt_enable_rt();
-
- /* Decode into vertical and horizontal scanout position. */
- *vpos = position & 0x1fff;
- diff -Nur linux-4.1.39.orig/drivers/i2c/busses/i2c-omap.c linux-4.1.39/drivers/i2c/busses/i2c-omap.c
- --- linux-4.1.39.orig/drivers/i2c/busses/i2c-omap.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/i2c/busses/i2c-omap.c 2017-04-18 17:56:30.581395889 +0200
- @@ -996,15 +996,12 @@
- u16 mask;
- u16 stat;
-
- - spin_lock(&dev->lock);
- - mask = omap_i2c_read_reg(dev, OMAP_I2C_IE_REG);
- stat = omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG);
- + mask = omap_i2c_read_reg(dev, OMAP_I2C_IE_REG);
-
- if (stat & mask)
- ret = IRQ_WAKE_THREAD;
-
- - spin_unlock(&dev->lock);
- -
- return ret;
- }
-
- diff -Nur linux-4.1.39.orig/drivers/ide/alim15x3.c linux-4.1.39/drivers/ide/alim15x3.c
- --- linux-4.1.39.orig/drivers/ide/alim15x3.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/ide/alim15x3.c 2017-04-18 17:56:30.581395889 +0200
- @@ -234,7 +234,7 @@
-
- isa_dev = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533, NULL);
-
- - local_irq_save(flags);
- + local_irq_save_nort(flags);
-
- if (m5229_revision < 0xC2) {
- /*
- @@ -325,7 +325,7 @@
- }
- pci_dev_put(north);
- pci_dev_put(isa_dev);
- - local_irq_restore(flags);
- + local_irq_restore_nort(flags);
- return 0;
- }
-
- diff -Nur linux-4.1.39.orig/drivers/ide/hpt366.c linux-4.1.39/drivers/ide/hpt366.c
- --- linux-4.1.39.orig/drivers/ide/hpt366.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/ide/hpt366.c 2017-04-18 17:56:30.581395889 +0200
- @@ -1241,7 +1241,7 @@
-
- dma_old = inb(base + 2);
-
- - local_irq_save(flags);
- + local_irq_save_nort(flags);
-
- dma_new = dma_old;
- pci_read_config_byte(dev, hwif->channel ? 0x4b : 0x43, &masterdma);
- @@ -1252,7 +1252,7 @@
- if (dma_new != dma_old)
- outb(dma_new, base + 2);
-
- - local_irq_restore(flags);
- + local_irq_restore_nort(flags);
-
- printk(KERN_INFO " %s: BM-DMA at 0x%04lx-0x%04lx\n",
- hwif->name, base, base + 7);
- diff -Nur linux-4.1.39.orig/drivers/ide/ide-io.c linux-4.1.39/drivers/ide/ide-io.c
- --- linux-4.1.39.orig/drivers/ide/ide-io.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/ide/ide-io.c 2017-04-18 17:56:30.581395889 +0200
- @@ -659,7 +659,7 @@
- /* disable_irq_nosync ?? */
- disable_irq(hwif->irq);
- /* local CPU only, as if we were handling an interrupt */
- - local_irq_disable();
- + local_irq_disable_nort();
- if (hwif->polling) {
- startstop = handler(drive);
- } else if (drive_is_ready(drive)) {
- diff -Nur linux-4.1.39.orig/drivers/ide/ide-iops.c linux-4.1.39/drivers/ide/ide-iops.c
- --- linux-4.1.39.orig/drivers/ide/ide-iops.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/ide/ide-iops.c 2017-04-18 17:56:30.585396045 +0200
- @@ -129,12 +129,12 @@
- if ((stat & ATA_BUSY) == 0)
- break;
-
- - local_irq_restore(flags);
- + local_irq_restore_nort(flags);
- *rstat = stat;
- return -EBUSY;
- }
- }
- - local_irq_restore(flags);
- + local_irq_restore_nort(flags);
- }
- /*
- * Allow status to settle, then read it again.
- diff -Nur linux-4.1.39.orig/drivers/ide/ide-io-std.c linux-4.1.39/drivers/ide/ide-io-std.c
- --- linux-4.1.39.orig/drivers/ide/ide-io-std.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/ide/ide-io-std.c 2017-04-18 17:56:30.581395889 +0200
- @@ -175,7 +175,7 @@
- unsigned long uninitialized_var(flags);
-
- if ((io_32bit & 2) && !mmio) {
- - local_irq_save(flags);
- + local_irq_save_nort(flags);
- ata_vlb_sync(io_ports->nsect_addr);
- }
-
- @@ -186,7 +186,7 @@
- insl(data_addr, buf, words);
-
- if ((io_32bit & 2) && !mmio)
- - local_irq_restore(flags);
- + local_irq_restore_nort(flags);
-
- if (((len + 1) & 3) < 2)
- return;
- @@ -219,7 +219,7 @@
- unsigned long uninitialized_var(flags);
-
- if ((io_32bit & 2) && !mmio) {
- - local_irq_save(flags);
- + local_irq_save_nort(flags);
- ata_vlb_sync(io_ports->nsect_addr);
- }
-
- @@ -230,7 +230,7 @@
- outsl(data_addr, buf, words);
-
- if ((io_32bit & 2) && !mmio)
- - local_irq_restore(flags);
- + local_irq_restore_nort(flags);
-
- if (((len + 1) & 3) < 2)
- return;
- diff -Nur linux-4.1.39.orig/drivers/ide/ide-probe.c linux-4.1.39/drivers/ide/ide-probe.c
- --- linux-4.1.39.orig/drivers/ide/ide-probe.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/ide/ide-probe.c 2017-04-18 17:56:30.585396045 +0200
- @@ -196,10 +196,10 @@
- int bswap = 1;
-
- /* local CPU only; some systems need this */
- - local_irq_save(flags);
- + local_irq_save_nort(flags);
- /* read 512 bytes of id info */
- hwif->tp_ops->input_data(drive, NULL, id, SECTOR_SIZE);
- - local_irq_restore(flags);
- + local_irq_restore_nort(flags);
-
- drive->dev_flags |= IDE_DFLAG_ID_READ;
- #ifdef DEBUG
- diff -Nur linux-4.1.39.orig/drivers/ide/ide-taskfile.c linux-4.1.39/drivers/ide/ide-taskfile.c
- --- linux-4.1.39.orig/drivers/ide/ide-taskfile.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/ide/ide-taskfile.c 2017-04-18 17:56:30.585396045 +0200
- @@ -250,7 +250,7 @@
-
- page_is_high = PageHighMem(page);
- if (page_is_high)
- - local_irq_save(flags);
- + local_irq_save_nort(flags);
-
- buf = kmap_atomic(page) + offset;
-
- @@ -271,7 +271,7 @@
- kunmap_atomic(buf);
-
- if (page_is_high)
- - local_irq_restore(flags);
- + local_irq_restore_nort(flags);
-
- len -= nr_bytes;
- }
- @@ -414,7 +414,7 @@
- }
-
- if ((drive->dev_flags & IDE_DFLAG_UNMASK) == 0)
- - local_irq_disable();
- + local_irq_disable_nort();
-
- ide_set_handler(drive, &task_pio_intr, WAIT_WORSTCASE);
-
- diff -Nur linux-4.1.39.orig/drivers/infiniband/ulp/ipoib/ipoib_multicast.c linux-4.1.39/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
- --- linux-4.1.39.orig/drivers/infiniband/ulp/ipoib/ipoib_multicast.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/infiniband/ulp/ipoib/ipoib_multicast.c 2017-04-18 17:56:30.585396045 +0200
- @@ -824,7 +824,7 @@
-
- ipoib_dbg_mcast(priv, "restarting multicast task\n");
-
- - local_irq_save(flags);
- + local_irq_save_nort(flags);
- netif_addr_lock(dev);
- spin_lock(&priv->lock);
-
- @@ -906,7 +906,7 @@
-
- spin_unlock(&priv->lock);
- netif_addr_unlock(dev);
- - local_irq_restore(flags);
- + local_irq_restore_nort(flags);
-
- /*
- * make sure the in-flight joins have finished before we attempt
- diff -Nur linux-4.1.39.orig/drivers/input/gameport/gameport.c linux-4.1.39/drivers/input/gameport/gameport.c
- --- linux-4.1.39.orig/drivers/input/gameport/gameport.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/input/gameport/gameport.c 2017-04-18 17:56:30.585396045 +0200
- @@ -124,12 +124,12 @@
- tx = 1 << 30;
-
- for(i = 0; i < 50; i++) {
- - local_irq_save(flags);
- + local_irq_save_nort(flags);
- GET_TIME(t1);
- for (t = 0; t < 50; t++) gameport_read(gameport);
- GET_TIME(t2);
- GET_TIME(t3);
- - local_irq_restore(flags);
- + local_irq_restore_nort(flags);
- udelay(i * 10);
- if ((t = DELTA(t2,t1) - DELTA(t3,t2)) < tx) tx = t;
- }
- @@ -148,11 +148,11 @@
- tx = 1 << 30;
-
- for(i = 0; i < 50; i++) {
- - local_irq_save(flags);
- + local_irq_save_nort(flags);
- rdtscl(t1);
- for (t = 0; t < 50; t++) gameport_read(gameport);
- rdtscl(t2);
- - local_irq_restore(flags);
- + local_irq_restore_nort(flags);
- udelay(i * 10);
- if (t2 - t1 < tx) tx = t2 - t1;
- }
- diff -Nur linux-4.1.39.orig/drivers/leds/trigger/Kconfig linux-4.1.39/drivers/leds/trigger/Kconfig
- --- linux-4.1.39.orig/drivers/leds/trigger/Kconfig 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/leds/trigger/Kconfig 2017-04-18 17:56:30.585396045 +0200
- @@ -61,7 +61,7 @@
-
- config LEDS_TRIGGER_CPU
- bool "LED CPU Trigger"
- - depends on LEDS_TRIGGERS
- + depends on LEDS_TRIGGERS && !PREEMPT_RT_BASE
- help
- This allows LEDs to be controlled by active CPUs. This shows
- the active CPUs across an array of LEDs so you can see which
- diff -Nur linux-4.1.39.orig/drivers/md/bcache/Kconfig linux-4.1.39/drivers/md/bcache/Kconfig
- --- linux-4.1.39.orig/drivers/md/bcache/Kconfig 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/md/bcache/Kconfig 2017-04-18 17:56:30.585396045 +0200
- @@ -1,6 +1,7 @@
-
- config BCACHE
- tristate "Block device as cache"
- + depends on !PREEMPT_RT_FULL
- ---help---
- Allows a block device to be used as cache for other devices; uses
- a btree for indexing and the layout is optimized for SSDs.
- diff -Nur linux-4.1.39.orig/drivers/md/dm.c linux-4.1.39/drivers/md/dm.c
- --- linux-4.1.39.orig/drivers/md/dm.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/md/dm.c 2017-04-18 17:56:30.585396045 +0200
- @@ -2141,7 +2141,7 @@
- /* Establish tio->ti before queuing work (map_tio_request) */
- tio->ti = ti;
- queue_kthread_work(&md->kworker, &tio->work);
- - BUG_ON(!irqs_disabled());
- + BUG_ON_NONRT(!irqs_disabled());
- }
-
- goto out;
- diff -Nur linux-4.1.39.orig/drivers/md/raid5.c linux-4.1.39/drivers/md/raid5.c
- --- linux-4.1.39.orig/drivers/md/raid5.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/md/raid5.c 2017-04-18 17:56:30.585396045 +0200
- @@ -1918,8 +1918,9 @@
- struct raid5_percpu *percpu;
- unsigned long cpu;
-
- - cpu = get_cpu();
- + cpu = get_cpu_light();
- percpu = per_cpu_ptr(conf->percpu, cpu);
- + spin_lock(&percpu->lock);
- if (test_bit(STRIPE_OP_BIOFILL, &ops_request)) {
- ops_run_biofill(sh);
- overlap_clear++;
- @@ -1975,7 +1976,8 @@
- if (test_and_clear_bit(R5_Overlap, &dev->flags))
- wake_up(&sh->raid_conf->wait_for_overlap);
- }
- - put_cpu();
- + spin_unlock(&percpu->lock);
- + put_cpu_light();
- }
-
- static struct stripe_head *alloc_stripe(struct kmem_cache *sc, gfp_t gfp)
- @@ -6375,6 +6377,7 @@
- __func__, cpu);
- break;
- }
- + spin_lock_init(&per_cpu_ptr(conf->percpu, cpu)->lock);
- }
- put_online_cpus();
-
- diff -Nur linux-4.1.39.orig/drivers/md/raid5.h linux-4.1.39/drivers/md/raid5.h
- --- linux-4.1.39.orig/drivers/md/raid5.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/md/raid5.h 2017-04-18 17:56:30.585396045 +0200
- @@ -495,6 +495,7 @@
- int recovery_disabled;
- /* per cpu variables */
- struct raid5_percpu {
- + spinlock_t lock; /* Protection for -RT */
- struct page *spare_page; /* Used when checking P/Q in raid6 */
- struct flex_array *scribble; /* space for constructing buffer
- * lists and performing address
- diff -Nur linux-4.1.39.orig/drivers/misc/hwlat_detector.c linux-4.1.39/drivers/misc/hwlat_detector.c
- --- linux-4.1.39.orig/drivers/misc/hwlat_detector.c 1970-01-01 01:00:00.000000000 +0100
- +++ linux-4.1.39/drivers/misc/hwlat_detector.c 2017-04-18 17:56:30.585396045 +0200
- @@ -0,0 +1,1240 @@
- +/*
- + * hwlat_detector.c - A simple Hardware Latency detector.
- + *
- + * Use this module to detect large system latencies induced by the behavior of
- + * certain underlying system hardware or firmware, independent of Linux itself.
- + * The code was developed originally to detect the presence of SMIs on Intel
- + * and AMD systems, although there is no dependency upon x86 herein.
- + *
- + * The classical example usage of this module is in detecting the presence of
- + * SMIs or System Management Interrupts on Intel and AMD systems. An SMI is a
- + * somewhat special form of hardware interrupt spawned from earlier CPU debug
- + * modes in which the (BIOS/EFI/etc.) firmware arranges for the South Bridge
- + * LPC (or other device) to generate a special interrupt under certain
- + * circumstances, for example, upon expiration of a special SMI timer device,
- + * due to certain external thermal readings, on certain I/O address accesses,
- + * and other situations. An SMI hits a special CPU pin, triggers a special
- + * SMI mode (complete with special memory map), and the OS is unaware.
- + *
- + * Although certain hardware-inducing latencies are necessary (for example,
- + * a modern system often requires an SMI handler for correct thermal control
- + * and remote management) they can wreak havoc upon any OS-level performance
- + * guarantees toward low-latency, especially when the OS is not even made
- + * aware of the presence of these interrupts. For this reason, we need a
- + * somewhat brute force mechanism to detect these interrupts. In this case,
- + * we do it by hogging all of the CPU(s) for configurable timer intervals,
- + * sampling the built-in CPU timer, looking for discontiguous readings.
- + *
- + * WARNING: This implementation necessarily introduces latencies. Therefore,
- + * you should NEVER use this module in a production environment
- + * requiring any kind of low-latency performance guarantee(s).
- + *
- + * Copyright (C) 2008-2009 Jon Masters, Red Hat, Inc. <jcm@redhat.com>
- + *
- + * Includes useful feedback from Clark Williams <clark@redhat.com>
- + *
- + * This file is licensed under the terms of the GNU General Public
- + * License version 2. This program is licensed "as is" without any
- + * warranty of any kind, whether express or implied.
- + */
- +
- +#include <linux/module.h>
- +#include <linux/init.h>
- +#include <linux/ring_buffer.h>
- +#include <linux/time.h>
- +#include <linux/hrtimer.h>
- +#include <linux/kthread.h>
- +#include <linux/debugfs.h>
- +#include <linux/seq_file.h>
- +#include <linux/uaccess.h>
- +#include <linux/version.h>
- +#include <linux/delay.h>
- +#include <linux/slab.h>
- +#include <linux/trace_clock.h>
- +
- +#define BUF_SIZE_DEFAULT 262144UL /* 8K*(sizeof(entry)) */
- +#define BUF_FLAGS (RB_FL_OVERWRITE) /* no block on full */
- +#define U64STR_SIZE 22 /* 20 digits max */
- +
- +#define VERSION "1.0.0"
- +#define BANNER "hwlat_detector: "
- +#define DRVNAME "hwlat_detector"
- +#define DEFAULT_SAMPLE_WINDOW 1000000 /* 1s */
- +#define DEFAULT_SAMPLE_WIDTH 500000 /* 0.5s */
- +#define DEFAULT_LAT_THRESHOLD 10 /* 10us */
- +
- +/* Module metadata */
- +
- +MODULE_LICENSE("GPL");
- +MODULE_AUTHOR("Jon Masters <jcm@redhat.com>");
- +MODULE_DESCRIPTION("A simple hardware latency detector");
- +MODULE_VERSION(VERSION);
- +
- +/* Module parameters */
- +
- +static int debug;
- +static int enabled;
- +static int threshold;
- +
- +module_param(debug, int, 0); /* enable debug */
- +module_param(enabled, int, 0); /* enable detector */
- +module_param(threshold, int, 0); /* latency threshold */
- +
- +/* Buffering and sampling */
- +
- +static struct ring_buffer *ring_buffer; /* sample buffer */
- +static DEFINE_MUTEX(ring_buffer_mutex); /* lock changes */
- +static unsigned long buf_size = BUF_SIZE_DEFAULT;
- +static struct task_struct *kthread; /* sampling thread */
- +
- +/* DebugFS filesystem entries */
- +
- +static struct dentry *debug_dir; /* debugfs directory */
- +static struct dentry *debug_max; /* maximum TSC delta */
- +static struct dentry *debug_count; /* total detect count */
- +static struct dentry *debug_sample_width; /* sample width us */
- +static struct dentry *debug_sample_window; /* sample window us */
- +static struct dentry *debug_sample; /* raw samples us */
- +static struct dentry *debug_threshold; /* threshold us */
- +static struct dentry *debug_enable; /* enable/disable */
- +
- +/* Individual samples and global state */
- +
- +struct sample; /* latency sample */
- +struct data; /* Global state */
- +
- +/* Sampling functions */
- +static int __buffer_add_sample(struct sample *sample);
- +static struct sample *buffer_get_sample(struct sample *sample);
- +
- +/* Threading and state */
- +static int kthread_fn(void *unused);
- +static int start_kthread(void);
- +static int stop_kthread(void);
- +static void __reset_stats(void);
- +static int init_stats(void);
- +
- +/* Debugfs interface */
- +static ssize_t simple_data_read(struct file *filp, char __user *ubuf,
- + size_t cnt, loff_t *ppos, const u64 *entry);
- +static ssize_t simple_data_write(struct file *filp, const char __user *ubuf,
- + size_t cnt, loff_t *ppos, u64 *entry);
- +static int debug_sample_fopen(struct inode *inode, struct file *filp);
- +static ssize_t debug_sample_fread(struct file *filp, char __user *ubuf,
- + size_t cnt, loff_t *ppos);
- +static int debug_sample_release(struct inode *inode, struct file *filp);
- +static int debug_enable_fopen(struct inode *inode, struct file *filp);
- +static ssize_t debug_enable_fread(struct file *filp, char __user *ubuf,
- + size_t cnt, loff_t *ppos);
- +static ssize_t debug_enable_fwrite(struct file *file,
- + const char __user *user_buffer,
- + size_t user_size, loff_t *offset);
- +
- +/* Initialization functions */
- +static int init_debugfs(void);
- +static void free_debugfs(void);
- +static int detector_init(void);
- +static void detector_exit(void);
- +
- +/* Individual latency samples are stored here when detected and packed into
- + * the ring_buffer circular buffer, where they are overwritten when
- + * more than buf_size/sizeof(sample) samples are received. */
- +struct sample {
- + u64 seqnum; /* unique sequence */
- + u64 duration; /* ktime delta */
- + u64 outer_duration; /* ktime delta (outer loop) */
- + struct timespec timestamp; /* wall time */
- + unsigned long lost;
- +};
- +
- +/* keep the global state somewhere. */
- +static struct data {
- +
- + struct mutex lock; /* protect changes */
- +
- + u64 count; /* total since reset */
- + u64 max_sample; /* max hardware latency */
- + u64 threshold; /* sample threshold level */
- +
- + u64 sample_window; /* total sampling window (on+off) */
- + u64 sample_width; /* active sampling portion of window */
- +
- + atomic_t sample_open; /* whether the sample file is open */
- +
- + wait_queue_head_t wq; /* waitqeue for new sample values */
- +
- +} data;
- +
- +/**
- + * __buffer_add_sample - add a new latency sample recording to the ring buffer
- + * @sample: The new latency sample value
- + *
- + * This receives a new latency sample and records it in a global ring buffer.
- + * No additional locking is used in this case.
- + */
- +static int __buffer_add_sample(struct sample *sample)
- +{
- + return ring_buffer_write(ring_buffer,
- + sizeof(struct sample), sample);
- +}
- +
- +/**
- + * buffer_get_sample - remove a hardware latency sample from the ring buffer
- + * @sample: Pre-allocated storage for the sample
- + *
- + * This retrieves a hardware latency sample from the global circular buffer
- + */
- +static struct sample *buffer_get_sample(struct sample *sample)
- +{
- + struct ring_buffer_event *e = NULL;
- + struct sample *s = NULL;
- + unsigned int cpu = 0;
- +
- + if (!sample)
- + return NULL;
- +
- + mutex_lock(&ring_buffer_mutex);
- + for_each_online_cpu(cpu) {
- + e = ring_buffer_consume(ring_buffer, cpu, NULL, &sample->lost);
- + if (e)
- + break;
- + }
- +
- + if (e) {
- + s = ring_buffer_event_data(e);
- + memcpy(sample, s, sizeof(struct sample));
- + } else
- + sample = NULL;
- + mutex_unlock(&ring_buffer_mutex);
- +
- + return sample;
- +}
- +
- +#ifndef CONFIG_TRACING
- +#define time_type ktime_t
- +#define time_get() ktime_get()
- +#define time_to_us(x) ktime_to_us(x)
- +#define time_sub(a, b) ktime_sub(a, b)
- +#define init_time(a, b) (a).tv64 = b
- +#define time_u64(a) ((a).tv64)
- +#else
- +#define time_type u64
- +#define time_get() trace_clock_local()
- +#define time_to_us(x) div_u64(x, 1000)
- +#define time_sub(a, b) ((a) - (b))
- +#define init_time(a, b) (a = b)
- +#define time_u64(a) a
- +#endif
- +/**
- + * get_sample - sample the CPU TSC and look for likely hardware latencies
- + *
- + * Used to repeatedly capture the CPU TSC (or similar), looking for potential
- + * hardware-induced latency. Called with interrupts disabled and with
- + * data.lock held.
- + */
- +static int get_sample(void)
- +{
- + time_type start, t1, t2, last_t2;
- + s64 diff, total = 0;
- + u64 sample = 0;
- + u64 outer_sample = 0;
- + int ret = -1;
- +
- + init_time(last_t2, 0);
- + start = time_get(); /* start timestamp */
- +
- + do {
- +
- + t1 = time_get(); /* we'll look for a discontinuity */
- + t2 = time_get();
- +
- + if (time_u64(last_t2)) {
- + /* Check the delta from outer loop (t2 to next t1) */
- + diff = time_to_us(time_sub(t1, last_t2));
- + /* This shouldn't happen */
- + if (diff < 0) {
- + pr_err(BANNER "time running backwards\n");
- + goto out;
- + }
- + if (diff > outer_sample)
- + outer_sample = diff;
- + }
- + last_t2 = t2;
- +
- + total = time_to_us(time_sub(t2, start)); /* sample width */
- +
- + /* This checks the inner loop (t1 to t2) */
- + diff = time_to_us(time_sub(t2, t1)); /* current diff */
- +
- + /* This shouldn't happen */
- + if (diff < 0) {
- + pr_err(BANNER "time running backwards\n");
- + goto out;
- + }
- +
- + if (diff > sample)
- + sample = diff; /* only want highest value */
- +
- + } while (total <= data.sample_width);
- +
- + ret = 0;
- +
- + /* If we exceed the threshold value, we have found a hardware latency */
- + if (sample > data.threshold || outer_sample > data.threshold) {
- + struct sample s;
- +
- + ret = 1;
- +
- + data.count++;
- + s.seqnum = data.count;
- + s.duration = sample;
- + s.outer_duration = outer_sample;
- + s.timestamp = CURRENT_TIME;
- + __buffer_add_sample(&s);
- +
- + /* Keep a running maximum ever recorded hardware latency */
- + if (sample > data.max_sample)
- + data.max_sample = sample;
- + }
- +
- +out:
- + return ret;
- +}
- +
- +/*
- + * kthread_fn - The CPU time sampling/hardware latency detection kernel thread
- + * @unused: A required part of the kthread API.
- + *
- + * Used to periodically sample the CPU TSC via a call to get_sample. We
- + * disable interrupts, which does (intentionally) introduce latency since we
- + * need to ensure nothing else might be running (and thus pre-empting).
- + * Obviously this should never be used in production environments.
- + *
- + * Currently this runs on which ever CPU it was scheduled on, but most
- + * real-worald hardware latency situations occur across several CPUs,
- + * but we might later generalize this if we find there are any actualy
- + * systems with alternate SMI delivery or other hardware latencies.
- + */
- +static int kthread_fn(void *unused)
- +{
- + int ret;
- + u64 interval;
- +
- + while (!kthread_should_stop()) {
- +
- + mutex_lock(&data.lock);
- +
- + local_irq_disable();
- + ret = get_sample();
- + local_irq_enable();
- +
- + if (ret > 0)
- + wake_up(&data.wq); /* wake up reader(s) */
- +
- + interval = data.sample_window - data.sample_width;
- + do_div(interval, USEC_PER_MSEC); /* modifies interval value */
- +
- + mutex_unlock(&data.lock);
- +
- + if (msleep_interruptible(interval))
- + break;
- + }
- +
- + return 0;
- +}
- +
- +/**
- + * start_kthread - Kick off the hardware latency sampling/detector kthread
- + *
- + * This starts a kernel thread that will sit and sample the CPU timestamp
- + * counter (TSC or similar) and look for potential hardware latencies.
- + */
- +static int start_kthread(void)
- +{
- + kthread = kthread_run(kthread_fn, NULL,
- + DRVNAME);
- + if (IS_ERR(kthread)) {
- + pr_err(BANNER "could not start sampling thread\n");
- + enabled = 0;
- + return -ENOMEM;
- + }
- +
- + return 0;
- +}
- +
- +/**
- + * stop_kthread - Inform the hardware latency samping/detector kthread to stop
- + *
- + * This kicks the running hardware latency sampling/detector kernel thread and
- + * tells it to stop sampling now. Use this on unload and at system shutdown.
- + */
- +static int stop_kthread(void)
- +{
- + int ret;
- +
- + ret = kthread_stop(kthread);
- +
- + return ret;
- +}
- +
- +/**
- + * __reset_stats - Reset statistics for the hardware latency detector
- + *
- + * We use data to store various statistics and global state. We call this
- + * function in order to reset those when "enable" is toggled on or off, and
- + * also at initialization. Should be called with data.lock held.
- + */
- +static void __reset_stats(void)
- +{
- + data.count = 0;
- + data.max_sample = 0;
- + ring_buffer_reset(ring_buffer); /* flush out old sample entries */
- +}
- +
- +/**
- + * init_stats - Setup global state statistics for the hardware latency detector
- + *
- + * We use data to store various statistics and global state. We also use
- + * a global ring buffer (ring_buffer) to keep raw samples of detected hardware
- + * induced system latencies. This function initializes these structures and
- + * allocates the global ring buffer also.
- + */
- +static int init_stats(void)
- +{
- + int ret = -ENOMEM;
- +
- + mutex_init(&data.lock);
- + init_waitqueue_head(&data.wq);
- + atomic_set(&data.sample_open, 0);
- +
- + ring_buffer = ring_buffer_alloc(buf_size, BUF_FLAGS);
- +
- + if (WARN(!ring_buffer, KERN_ERR BANNER
- + "failed to allocate ring buffer!\n"))
- + goto out;
- +
- + __reset_stats();
- + data.threshold = threshold ?: DEFAULT_LAT_THRESHOLD; /* threshold us */
- + data.sample_window = DEFAULT_SAMPLE_WINDOW; /* window us */
- + data.sample_width = DEFAULT_SAMPLE_WIDTH; /* width us */
- +
- + ret = 0;
- +
- +out:
- + return ret;
- +
- +}
- +
- +/*
- + * simple_data_read - Wrapper read function for global state debugfs entries
- + * @filp: The active open file structure for the debugfs "file"
- + * @ubuf: The userspace provided buffer to read value into
- + * @cnt: The maximum number of bytes to read
- + * @ppos: The current "file" position
- + * @entry: The entry to read from
- + *
- + * This function provides a generic read implementation for the global state
- + * "data" structure debugfs filesystem entries. It would be nice to use
- + * simple_attr_read directly, but we need to make sure that the data.lock
- + * is held during the actual read.
- + */
- +static ssize_t simple_data_read(struct file *filp, char __user *ubuf,
- + size_t cnt, loff_t *ppos, const u64 *entry)
- +{
- + char buf[U64STR_SIZE];
- + u64 val = 0;
- + int len = 0;
- +
- + memset(buf, 0, sizeof(buf));
- +
- + if (!entry)
- + return -EFAULT;
- +
- + mutex_lock(&data.lock);
- + val = *entry;
- + mutex_unlock(&data.lock);
- +
- + len = snprintf(buf, sizeof(buf), "%llu\n", (unsigned long long)val);
- +
- + return simple_read_from_buffer(ubuf, cnt, ppos, buf, len);
- +
- +}
- +
- +/*
- + * simple_data_write - Wrapper write function for global state debugfs entries
- + * @filp: The active open file structure for the debugfs "file"
- + * @ubuf: The userspace provided buffer to write value from
- + * @cnt: The maximum number of bytes to write
- + * @ppos: The current "file" position
- + * @entry: The entry to write to
- + *
- + * This function provides a generic write implementation for the global state
- + * "data" structure debugfs filesystem entries. It would be nice to use
- + * simple_attr_write directly, but we need to make sure that the data.lock
- + * is held during the actual write.
- + */
- +static ssize_t simple_data_write(struct file *filp, const char __user *ubuf,
- + size_t cnt, loff_t *ppos, u64 *entry)
- +{
- + char buf[U64STR_SIZE];
- + int csize = min(cnt, sizeof(buf));
- + u64 val = 0;
- + int err = 0;
- +
- + memset(buf, '\0', sizeof(buf));
- + if (copy_from_user(buf, ubuf, csize))
- + return -EFAULT;
- +
- + buf[U64STR_SIZE-1] = '\0'; /* just in case */
- + err = kstrtoull(buf, 10, &val);
- + if (err)
- + return -EINVAL;
- +
- + mutex_lock(&data.lock);
- + *entry = val;
- + mutex_unlock(&data.lock);
- +
- + return csize;
- +}
- +
- +/**
- + * debug_count_fopen - Open function for "count" debugfs entry
- + * @inode: The in-kernel inode representation of the debugfs "file"
- + * @filp: The active open file structure for the debugfs "file"
- + *
- + * This function provides an open implementation for the "count" debugfs
- + * interface to the hardware latency detector.
- + */
- +static int debug_count_fopen(struct inode *inode, struct file *filp)
- +{
- + return 0;
- +}
- +
- +/**
- + * debug_count_fread - Read function for "count" debugfs entry
- + * @filp: The active open file structure for the debugfs "file"
- + * @ubuf: The userspace provided buffer to read value into
- + * @cnt: The maximum number of bytes to read
- + * @ppos: The current "file" position
- + *
- + * This function provides a read implementation for the "count" debugfs
- + * interface to the hardware latency detector. Can be used to read the
- + * number of latency readings exceeding the configured threshold since
- + * the detector was last reset (e.g. by writing a zero into "count").
- + */
- +static ssize_t debug_count_fread(struct file *filp, char __user *ubuf,
- + size_t cnt, loff_t *ppos)
- +{
- + return simple_data_read(filp, ubuf, cnt, ppos, &data.count);
- +}
- +
- +/**
- + * debug_count_fwrite - Write function for "count" debugfs entry
- + * @filp: The active open file structure for the debugfs "file"
- + * @ubuf: The user buffer that contains the value to write
- + * @cnt: The maximum number of bytes to write to "file"
- + * @ppos: The current position in the debugfs "file"
- + *
- + * This function provides a write implementation for the "count" debugfs
- + * interface to the hardware latency detector. Can be used to write a
- + * desired value, especially to zero the total count.
- + */
- +static ssize_t debug_count_fwrite(struct file *filp,
- + const char __user *ubuf,
- + size_t cnt,
- + loff_t *ppos)
- +{
- + return simple_data_write(filp, ubuf, cnt, ppos, &data.count);
- +}
- +
- +/**
- + * debug_enable_fopen - Dummy open function for "enable" debugfs interface
- + * @inode: The in-kernel inode representation of the debugfs "file"
- + * @filp: The active open file structure for the debugfs "file"
- + *
- + * This function provides an open implementation for the "enable" debugfs
- + * interface to the hardware latency detector.
- + */
- +static int debug_enable_fopen(struct inode *inode, struct file *filp)
- +{
- + return 0;
- +}
- +
- +/**
- + * debug_enable_fread - Read function for "enable" debugfs interface
- + * @filp: The active open file structure for the debugfs "file"
- + * @ubuf: The userspace provided buffer to read value into
- + * @cnt: The maximum number of bytes to read
- + * @ppos: The current "file" position
- + *
- + * This function provides a read implementation for the "enable" debugfs
- + * interface to the hardware latency detector. Can be used to determine
- + * whether the detector is currently enabled ("0\n" or "1\n" returned).
- + */
- +static ssize_t debug_enable_fread(struct file *filp, char __user *ubuf,
- + size_t cnt, loff_t *ppos)
- +{
- + char buf[4];
- +
- + if ((cnt < sizeof(buf)) || (*ppos))
- + return 0;
- +
- + buf[0] = enabled ? '1' : '0';
- + buf[1] = '\n';
- + buf[2] = '\0';
- + if (copy_to_user(ubuf, buf, strlen(buf)))
- + return -EFAULT;
- + return *ppos = strlen(buf);
- +}
- +
- +/**
- + * debug_enable_fwrite - Write function for "enable" debugfs interface
- + * @filp: The active open file structure for the debugfs "file"
- + * @ubuf: The user buffer that contains the value to write
- + * @cnt: The maximum number of bytes to write to "file"
- + * @ppos: The current position in the debugfs "file"
- + *
- + * This function provides a write implementation for the "enable" debugfs
- + * interface to the hardware latency detector. Can be used to enable or
- + * disable the detector, which will have the side-effect of possibly
- + * also resetting the global stats and kicking off the measuring
- + * kthread (on an enable) or the converse (upon a disable).
- + */
- +static ssize_t debug_enable_fwrite(struct file *filp,
- + const char __user *ubuf,
- + size_t cnt,
- + loff_t *ppos)
- +{
- + char buf[4];
- + int csize = min(cnt, sizeof(buf));
- + long val = 0;
- + int err = 0;
- +
- + memset(buf, '\0', sizeof(buf));
- + if (copy_from_user(buf, ubuf, csize))
- + return -EFAULT;
- +
- + buf[sizeof(buf)-1] = '\0'; /* just in case */
- + err = kstrtoul(buf, 10, &val);
- + if (0 != err)
- + return -EINVAL;
- +
- + if (val) {
- + if (enabled)
- + goto unlock;
- + enabled = 1;
- + __reset_stats();
- + if (start_kthread())
- + return -EFAULT;
- + } else {
- + if (!enabled)
- + goto unlock;
- + enabled = 0;
- + err = stop_kthread();
- + if (err) {
- + pr_err(BANNER "cannot stop kthread\n");
- + return -EFAULT;
- + }
- + wake_up(&data.wq); /* reader(s) should return */
- + }
- +unlock:
- + return csize;
- +}
- +
- +/**
- + * debug_max_fopen - Open function for "max" debugfs entry
- + * @inode: The in-kernel inode representation of the debugfs "file"
- + * @filp: The active open file structure for the debugfs "file"
- + *
- + * This function provides an open implementation for the "max" debugfs
- + * interface to the hardware latency detector.
- + */
- +static int debug_max_fopen(struct inode *inode, struct file *filp)
- +{
- + return 0;
- +}
- +
- +/**
- + * debug_max_fread - Read function for "max" debugfs entry
- + * @filp: The active open file structure for the debugfs "file"
- + * @ubuf: The userspace provided buffer to read value into
- + * @cnt: The maximum number of bytes to read
- + * @ppos: The current "file" position
- + *
- + * This function provides a read implementation for the "max" debugfs
- + * interface to the hardware latency detector. Can be used to determine
- + * the maximum latency value observed since it was last reset.
- + */
- +static ssize_t debug_max_fread(struct file *filp, char __user *ubuf,
- + size_t cnt, loff_t *ppos)
- +{
- + return simple_data_read(filp, ubuf, cnt, ppos, &data.max_sample);
- +}
- +
- +/**
- + * debug_max_fwrite - Write function for "max" debugfs entry
- + * @filp: The active open file structure for the debugfs "file"
- + * @ubuf: The user buffer that contains the value to write
- + * @cnt: The maximum number of bytes to write to "file"
- + * @ppos: The current position in the debugfs "file"
- + *
- + * This function provides a write implementation for the "max" debugfs
- + * interface to the hardware latency detector. Can be used to reset the
- + * maximum or set it to some other desired value - if, then, subsequent
- + * measurements exceed this value, the maximum will be updated.
- + */
- +static ssize_t debug_max_fwrite(struct file *filp,
- + const char __user *ubuf,
- + size_t cnt,
- + loff_t *ppos)
- +{
- + return simple_data_write(filp, ubuf, cnt, ppos, &data.max_sample);
- +}
- +
- +
- +/**
- + * debug_sample_fopen - An open function for "sample" debugfs interface
- + * @inode: The in-kernel inode representation of this debugfs "file"
- + * @filp: The active open file structure for the debugfs "file"
- + *
- + * This function handles opening the "sample" file within the hardware
- + * latency detector debugfs directory interface. This file is used to read
- + * raw samples from the global ring_buffer and allows the user to see a
- + * running latency history. Can be opened blocking or non-blocking,
- + * affecting whether it behaves as a buffer read pipe, or does not.
- + * Implements simple locking to prevent multiple simultaneous use.
- + */
- +static int debug_sample_fopen(struct inode *inode, struct file *filp)
- +{
- + if (!atomic_add_unless(&data.sample_open, 1, 1))
- + return -EBUSY;
- + else
- + return 0;
- +}
- +
- +/**
- + * debug_sample_fread - A read function for "sample" debugfs interface
- + * @filp: The active open file structure for the debugfs "file"
- + * @ubuf: The user buffer that will contain the samples read
- + * @cnt: The maximum bytes to read from the debugfs "file"
- + * @ppos: The current position in the debugfs "file"
- + *
- + * This function handles reading from the "sample" file within the hardware
- + * latency detector debugfs directory interface. This file is used to read
- + * raw samples from the global ring_buffer and allows the user to see a
- + * running latency history. By default this will block pending a new
- + * value written into the sample buffer, unless there are already a
- + * number of value(s) waiting in the buffer, or the sample file was
- + * previously opened in a non-blocking mode of operation.
- + */
- +static ssize_t debug_sample_fread(struct file *filp, char __user *ubuf,
- + size_t cnt, loff_t *ppos)
- +{
- + int len = 0;
- + char buf[64];
- + struct sample *sample = NULL;
- +
- + if (!enabled)
- + return 0;
- +
- + sample = kzalloc(sizeof(struct sample), GFP_KERNEL);
- + if (!sample)
- + return -ENOMEM;
- +
- + while (!buffer_get_sample(sample)) {
- +
- + DEFINE_WAIT(wait);
- +
- + if (filp->f_flags & O_NONBLOCK) {
- + len = -EAGAIN;
- + goto out;
- + }
- +
- + prepare_to_wait(&data.wq, &wait, TASK_INTERRUPTIBLE);
- + schedule();
- + finish_wait(&data.wq, &wait);
- +
- + if (signal_pending(current)) {
- + len = -EINTR;
- + goto out;
- + }
- +
- + if (!enabled) { /* enable was toggled */
- + len = 0;
- + goto out;
- + }
- + }
- +
- + len = snprintf(buf, sizeof(buf), "%010lu.%010lu\t%llu\t%llu\n",
- + sample->timestamp.tv_sec,
- + sample->timestamp.tv_nsec,
- + sample->duration,
- + sample->outer_duration);
- +
- +
- + /* handling partial reads is more trouble than it's worth */
- + if (len > cnt)
- + goto out;
- +
- + if (copy_to_user(ubuf, buf, len))
- + len = -EFAULT;
- +
- +out:
- + kfree(sample);
- + return len;
- +}
- +
- +/**
- + * debug_sample_release - Release function for "sample" debugfs interface
- + * @inode: The in-kernel inode represenation of the debugfs "file"
- + * @filp: The active open file structure for the debugfs "file"
- + *
- + * This function completes the close of the debugfs interface "sample" file.
- + * Frees the sample_open "lock" so that other users may open the interface.
- + */
- +static int debug_sample_release(struct inode *inode, struct file *filp)
- +{
- + atomic_dec(&data.sample_open);
- +
- + return 0;
- +}
- +
- +/**
- + * debug_threshold_fopen - Open function for "threshold" debugfs entry
- + * @inode: The in-kernel inode representation of the debugfs "file"
- + * @filp: The active open file structure for the debugfs "file"
- + *
- + * This function provides an open implementation for the "threshold" debugfs
- + * interface to the hardware latency detector.
- + */
- +static int debug_threshold_fopen(struct inode *inode, struct file *filp)
- +{
- + return 0;
- +}
- +
- +/**
- + * debug_threshold_fread - Read function for "threshold" debugfs entry
- + * @filp: The active open file structure for the debugfs "file"
- + * @ubuf: The userspace provided buffer to read value into
- + * @cnt: The maximum number of bytes to read
- + * @ppos: The current "file" position
- + *
- + * This function provides a read implementation for the "threshold" debugfs
- + * interface to the hardware latency detector. It can be used to determine
- + * the current threshold level at which a latency will be recorded in the
- + * global ring buffer, typically on the order of 10us.
- + */
- +static ssize_t debug_threshold_fread(struct file *filp, char __user *ubuf,
- + size_t cnt, loff_t *ppos)
- +{
- + return simple_data_read(filp, ubuf, cnt, ppos, &data.threshold);
- +}
- +
- +/**
- + * debug_threshold_fwrite - Write function for "threshold" debugfs entry
- + * @filp: The active open file structure for the debugfs "file"
- + * @ubuf: The user buffer that contains the value to write
- + * @cnt: The maximum number of bytes to write to "file"
- + * @ppos: The current position in the debugfs "file"
- + *
- + * This function provides a write implementation for the "threshold" debugfs
- + * interface to the hardware latency detector. It can be used to configure
- + * the threshold level at which any subsequently detected latencies will
- + * be recorded into the global ring buffer.
- + */
- +static ssize_t debug_threshold_fwrite(struct file *filp,
- + const char __user *ubuf,
- + size_t cnt,
- + loff_t *ppos)
- +{
- + int ret;
- +
- + ret = simple_data_write(filp, ubuf, cnt, ppos, &data.threshold);
- +
- + if (enabled)
- + wake_up_process(kthread);
- +
- + return ret;
- +}
- +
- +/**
- + * debug_width_fopen - Open function for "width" debugfs entry
- + * @inode: The in-kernel inode representation of the debugfs "file"
- + * @filp: The active open file structure for the debugfs "file"
- + *
- + * This function provides an open implementation for the "width" debugfs
- + * interface to the hardware latency detector.
- + */
- +static int debug_width_fopen(struct inode *inode, struct file *filp)
- +{
- + return 0;
- +}
- +
- +/**
- + * debug_width_fread - Read function for "width" debugfs entry
- + * @filp: The active open file structure for the debugfs "file"
- + * @ubuf: The userspace provided buffer to read value into
- + * @cnt: The maximum number of bytes to read
- + * @ppos: The current "file" position
- + *
- + * This function provides a read implementation for the "width" debugfs
- + * interface to the hardware latency detector. It can be used to determine
- + * for how many us of the total window us we will actively sample for any
- + * hardware-induced latecy periods. Obviously, it is not possible to
- + * sample constantly and have the system respond to a sample reader, or,
- + * worse, without having the system appear to have gone out to lunch.
- + */
- +static ssize_t debug_width_fread(struct file *filp, char __user *ubuf,
- + size_t cnt, loff_t *ppos)
- +{
- + return simple_data_read(filp, ubuf, cnt, ppos, &data.sample_width);
- +}
- +
- +/**
- + * debug_width_fwrite - Write function for "width" debugfs entry
- + * @filp: The active open file structure for the debugfs "file"
- + * @ubuf: The user buffer that contains the value to write
- + * @cnt: The maximum number of bytes to write to "file"
- + * @ppos: The current position in the debugfs "file"
- + *
- + * This function provides a write implementation for the "width" debugfs
- + * interface to the hardware latency detector. It can be used to configure
- + * for how many us of the total window us we will actively sample for any
- + * hardware-induced latency periods. Obviously, it is not possible to
- + * sample constantly and have the system respond to a sample reader, or,
- + * worse, without having the system appear to have gone out to lunch. It
- + * is enforced that width is less that the total window size.
- + */
- +static ssize_t debug_width_fwrite(struct file *filp,
- + const char __user *ubuf,
- + size_t cnt,
- + loff_t *ppos)
- +{
- + char buf[U64STR_SIZE];
- + int csize = min(cnt, sizeof(buf));
- + u64 val = 0;
- + int err = 0;
- +
- + memset(buf, '\0', sizeof(buf));
- + if (copy_from_user(buf, ubuf, csize))
- + return -EFAULT;
- +
- + buf[U64STR_SIZE-1] = '\0'; /* just in case */
- + err = kstrtoull(buf, 10, &val);
- + if (0 != err)
- + return -EINVAL;
- +
- + mutex_lock(&data.lock);
- + if (val < data.sample_window)
- + data.sample_width = val;
- + else {
- + mutex_unlock(&data.lock);
- + return -EINVAL;
- + }
- + mutex_unlock(&data.lock);
- +
- + if (enabled)
- + wake_up_process(kthread);
- +
- + return csize;
- +}
- +
- +/**
- + * debug_window_fopen - Open function for "window" debugfs entry
- + * @inode: The in-kernel inode representation of the debugfs "file"
- + * @filp: The active open file structure for the debugfs "file"
- + *
- + * This function provides an open implementation for the "window" debugfs
- + * interface to the hardware latency detector. The window is the total time
- + * in us that will be considered one sample period. Conceptually, windows
- + * occur back-to-back and contain a sample width period during which
- + * actual sampling occurs.
- + */
- +static int debug_window_fopen(struct inode *inode, struct file *filp)
- +{
- + return 0;
- +}
- +
- +/**
- + * debug_window_fread - Read function for "window" debugfs entry
- + * @filp: The active open file structure for the debugfs "file"
- + * @ubuf: The userspace provided buffer to read value into
- + * @cnt: The maximum number of bytes to read
- + * @ppos: The current "file" position
- + *
- + * This function provides a read implementation for the "window" debugfs
- + * interface to the hardware latency detector. The window is the total time
- + * in us that will be considered one sample period. Conceptually, windows
- + * occur back-to-back and contain a sample width period during which
- + * actual sampling occurs. Can be used to read the total window size.
- + */
- +static ssize_t debug_window_fread(struct file *filp, char __user *ubuf,
- + size_t cnt, loff_t *ppos)
- +{
- + return simple_data_read(filp, ubuf, cnt, ppos, &data.sample_window);
- +}
- +
- +/**
- + * debug_window_fwrite - Write function for "window" debugfs entry
- + * @filp: The active open file structure for the debugfs "file"
- + * @ubuf: The user buffer that contains the value to write
- + * @cnt: The maximum number of bytes to write to "file"
- + * @ppos: The current position in the debugfs "file"
- + *
- + * This function provides a write implementation for the "window" debufds
- + * interface to the hardware latency detetector. The window is the total time
- + * in us that will be considered one sample period. Conceptually, windows
- + * occur back-to-back and contain a sample width period during which
- + * actual sampling occurs. Can be used to write a new total window size. It
- + * is enfoced that any value written must be greater than the sample width
- + * size, or an error results.
- + */
- +static ssize_t debug_window_fwrite(struct file *filp,
- + const char __user *ubuf,
- + size_t cnt,
- + loff_t *ppos)
- +{
- + char buf[U64STR_SIZE];
- + int csize = min(cnt, sizeof(buf));
- + u64 val = 0;
- + int err = 0;
- +
- + memset(buf, '\0', sizeof(buf));
- + if (copy_from_user(buf, ubuf, csize))
- + return -EFAULT;
- +
- + buf[U64STR_SIZE-1] = '\0'; /* just in case */
- + err = kstrtoull(buf, 10, &val);
- + if (0 != err)
- + return -EINVAL;
- +
- + mutex_lock(&data.lock);
- + if (data.sample_width < val)
- + data.sample_window = val;
- + else {
- + mutex_unlock(&data.lock);
- + return -EINVAL;
- + }
- + mutex_unlock(&data.lock);
- +
- + return csize;
- +}
- +
- +/*
- + * Function pointers for the "count" debugfs file operations
- + */
- +static const struct file_operations count_fops = {
- + .open = debug_count_fopen,
- + .read = debug_count_fread,
- + .write = debug_count_fwrite,
- + .owner = THIS_MODULE,
- +};
- +
- +/*
- + * Function pointers for the "enable" debugfs file operations
- + */
- +static const struct file_operations enable_fops = {
- + .open = debug_enable_fopen,
- + .read = debug_enable_fread,
- + .write = debug_enable_fwrite,
- + .owner = THIS_MODULE,
- +};
- +
- +/*
- + * Function pointers for the "max" debugfs file operations
- + */
- +static const struct file_operations max_fops = {
- + .open = debug_max_fopen,
- + .read = debug_max_fread,
- + .write = debug_max_fwrite,
- + .owner = THIS_MODULE,
- +};
- +
- +/*
- + * Function pointers for the "sample" debugfs file operations
- + */
- +static const struct file_operations sample_fops = {
- + .open = debug_sample_fopen,
- + .read = debug_sample_fread,
- + .release = debug_sample_release,
- + .owner = THIS_MODULE,
- +};
- +
- +/*
- + * Function pointers for the "threshold" debugfs file operations
- + */
- +static const struct file_operations threshold_fops = {
- + .open = debug_threshold_fopen,
- + .read = debug_threshold_fread,
- + .write = debug_threshold_fwrite,
- + .owner = THIS_MODULE,
- +};
- +
- +/*
- + * Function pointers for the "width" debugfs file operations
- + */
- +static const struct file_operations width_fops = {
- + .open = debug_width_fopen,
- + .read = debug_width_fread,
- + .write = debug_width_fwrite,
- + .owner = THIS_MODULE,
- +};
- +
- +/*
- + * Function pointers for the "window" debugfs file operations
- + */
- +static const struct file_operations window_fops = {
- + .open = debug_window_fopen,
- + .read = debug_window_fread,
- + .write = debug_window_fwrite,
- + .owner = THIS_MODULE,
- +};
- +
- +/**
- + * init_debugfs - A function to initialize the debugfs interface files
- + *
- + * This function creates entries in debugfs for "hwlat_detector", including
- + * files to read values from the detector, current samples, and the
- + * maximum sample that has been captured since the hardware latency
- + * dectector was started.
- + */
- +static int init_debugfs(void)
- +{
- + int ret = -ENOMEM;
- +
- + debug_dir = debugfs_create_dir(DRVNAME, NULL);
- + if (!debug_dir)
- + goto err_debug_dir;
- +
- + debug_sample = debugfs_create_file("sample", 0444,
- + debug_dir, NULL,
- + &sample_fops);
- + if (!debug_sample)
- + goto err_sample;
- +
- + debug_count = debugfs_create_file("count", 0444,
- + debug_dir, NULL,
- + &count_fops);
- + if (!debug_count)
- + goto err_count;
- +
- + debug_max = debugfs_create_file("max", 0444,
- + debug_dir, NULL,
- + &max_fops);
- + if (!debug_max)
- + goto err_max;
- +
- + debug_sample_window = debugfs_create_file("window", 0644,
- + debug_dir, NULL,
- + &window_fops);
- + if (!debug_sample_window)
- + goto err_window;
- +
- + debug_sample_width = debugfs_create_file("width", 0644,
- + debug_dir, NULL,
- + &width_fops);
- + if (!debug_sample_width)
- + goto err_width;
- +
- + debug_threshold = debugfs_create_file("threshold", 0644,
- + debug_dir, NULL,
- + &threshold_fops);
- + if (!debug_threshold)
- + goto err_threshold;
- +
- + debug_enable = debugfs_create_file("enable", 0644,
- + debug_dir, &enabled,
- + &enable_fops);
- + if (!debug_enable)
- + goto err_enable;
- +
- + else {
- + ret = 0;
- + goto out;
- + }
- +
- +err_enable:
- + debugfs_remove(debug_threshold);
- +err_threshold:
- + debugfs_remove(debug_sample_width);
- +err_width:
- + debugfs_remove(debug_sample_window);
- +err_window:
- + debugfs_remove(debug_max);
- +err_max:
- + debugfs_remove(debug_count);
- +err_count:
- + debugfs_remove(debug_sample);
- +err_sample:
- + debugfs_remove(debug_dir);
- +err_debug_dir:
- +out:
- + return ret;
- +}
- +
- +/**
- + * free_debugfs - A function to cleanup the debugfs file interface
- + */
- +static void free_debugfs(void)
- +{
- + /* could also use a debugfs_remove_recursive */
- + debugfs_remove(debug_enable);
- + debugfs_remove(debug_threshold);
- + debugfs_remove(debug_sample_width);
- + debugfs_remove(debug_sample_window);
- + debugfs_remove(debug_max);
- + debugfs_remove(debug_count);
- + debugfs_remove(debug_sample);
- + debugfs_remove(debug_dir);
- +}
- +
- +/**
- + * detector_init - Standard module initialization code
- + */
- +static int detector_init(void)
- +{
- + int ret = -ENOMEM;
- +
- + pr_info(BANNER "version %s\n", VERSION);
- +
- + ret = init_stats();
- + if (0 != ret)
- + goto out;
- +
- + ret = init_debugfs();
- + if (0 != ret)
- + goto err_stats;
- +
- + if (enabled)
- + ret = start_kthread();
- +
- + goto out;
- +
- +err_stats:
- + ring_buffer_free(ring_buffer);
- +out:
- + return ret;
- +
- +}
- +
- +/**
- + * detector_exit - Standard module cleanup code
- + */
- +static void detector_exit(void)
- +{
- + int err;
- +
- + if (enabled) {
- + enabled = 0;
- + err = stop_kthread();
- + if (err)
- + pr_err(BANNER "cannot stop kthread\n");
- + }
- +
- + free_debugfs();
- + ring_buffer_free(ring_buffer); /* free up the ring buffer */
- +
- +}
- +
- +module_init(detector_init);
- +module_exit(detector_exit);
- diff -Nur linux-4.1.39.orig/drivers/misc/Kconfig linux-4.1.39/drivers/misc/Kconfig
- --- linux-4.1.39.orig/drivers/misc/Kconfig 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/misc/Kconfig 2017-04-18 17:56:30.585396045 +0200
- @@ -54,6 +54,7 @@
- config ATMEL_TCLIB
- bool "Atmel AT32/AT91 Timer/Counter Library"
- depends on (AVR32 || ARCH_AT91)
- + default y if PREEMPT_RT_FULL
- help
- Select this if you want a library to allocate the Timer/Counter
- blocks found on many Atmel processors. This facilitates using
- @@ -69,8 +70,7 @@
- are combined to make a single 32-bit timer.
-
- When GENERIC_CLOCKEVENTS is defined, the third timer channel
- - may be used as a clock event device supporting oneshot mode
- - (delays of up to two seconds) based on the 32 KiHz clock.
- + may be used as a clock event device supporting oneshot mode.
-
- config ATMEL_TCB_CLKSRC_BLOCK
- int
- @@ -84,6 +84,15 @@
- TC can be used for other purposes, such as PWM generation and
- interval timing.
-
- +config ATMEL_TCB_CLKSRC_USE_SLOW_CLOCK
- + bool "TC Block use 32 KiHz clock"
- + depends on ATMEL_TCB_CLKSRC
- + default y if !PREEMPT_RT_FULL
- + help
- + Select this to use 32 KiHz base clock rate as TC block clock
- + source for clock events.
- +
- +
- config DUMMY_IRQ
- tristate "Dummy IRQ handler"
- default n
- @@ -113,6 +122,35 @@
- for information on the specific driver level and support statement
- for your IBM server.
-
- +config HWLAT_DETECTOR
- + tristate "Testing module to detect hardware-induced latencies"
- + depends on DEBUG_FS
- + depends on RING_BUFFER
- + default m
- + ---help---
- + A simple hardware latency detector. Use this module to detect
- + large latencies introduced by the behavior of the underlying
- + system firmware external to Linux. We do this using periodic
- + use of stop_machine to grab all available CPUs and measure
- + for unexplainable gaps in the CPU timestamp counter(s). By
- + default, the module is not enabled until the "enable" file
- + within the "hwlat_detector" debugfs directory is toggled.
- +
- + This module is often used to detect SMI (System Management
- + Interrupts) on x86 systems, though is not x86 specific. To
- + this end, we default to using a sample window of 1 second,
- + during which we will sample for 0.5 seconds. If an SMI or
- + similar event occurs during that time, it is recorded
- + into an 8K samples global ring buffer until retreived.
- +
- + WARNING: This software should never be enabled (it can be built
- + but should not be turned on after it is loaded) in a production
- + environment where high latencies are a concern since the
- + sampling mechanism actually introduces latencies for
- + regular tasks while the CPU(s) are being held.
- +
- + If unsure, say N
- +
- config PHANTOM
- tristate "Sensable PHANToM (PCI)"
- depends on PCI
- diff -Nur linux-4.1.39.orig/drivers/misc/Makefile linux-4.1.39/drivers/misc/Makefile
- --- linux-4.1.39.orig/drivers/misc/Makefile 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/misc/Makefile 2017-04-18 17:56:30.585396045 +0200
- @@ -38,6 +38,7 @@
- obj-$(CONFIG_HMC6352) += hmc6352.o
- obj-y += eeprom/
- obj-y += cb710/
- +obj-$(CONFIG_HWLAT_DETECTOR) += hwlat_detector.o
- obj-$(CONFIG_SPEAR13XX_PCIE_GADGET) += spear13xx_pcie_gadget.o
- obj-$(CONFIG_VMWARE_BALLOON) += vmw_balloon.o
- obj-$(CONFIG_ARM_CHARLCD) += arm-charlcd.o
- diff -Nur linux-4.1.39.orig/drivers/mmc/host/mmci.c linux-4.1.39/drivers/mmc/host/mmci.c
- --- linux-4.1.39.orig/drivers/mmc/host/mmci.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/mmc/host/mmci.c 2017-04-18 17:56:30.589396200 +0200
- @@ -1155,15 +1155,12 @@
- struct sg_mapping_iter *sg_miter = &host->sg_miter;
- struct variant_data *variant = host->variant;
- void __iomem *base = host->base;
- - unsigned long flags;
- u32 status;
-
- status = readl(base + MMCISTATUS);
-
- dev_dbg(mmc_dev(host->mmc), "irq1 (pio) %08x\n", status);
-
- - local_irq_save(flags);
- -
- do {
- unsigned int remain, len;
- char *buffer;
- @@ -1203,8 +1200,6 @@
-
- sg_miter_stop(sg_miter);
-
- - local_irq_restore(flags);
- -
- /*
- * If we have less than the fifo 'half-full' threshold to transfer,
- * trigger a PIO interrupt as soon as any data is available.
- diff -Nur linux-4.1.39.orig/drivers/net/ethernet/3com/3c59x.c linux-4.1.39/drivers/net/ethernet/3com/3c59x.c
- --- linux-4.1.39.orig/drivers/net/ethernet/3com/3c59x.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/net/ethernet/3com/3c59x.c 2017-04-18 17:56:30.589396200 +0200
- @@ -842,9 +842,9 @@
- {
- struct vortex_private *vp = netdev_priv(dev);
- unsigned long flags;
- - local_irq_save(flags);
- + local_irq_save_nort(flags);
- (vp->full_bus_master_rx ? boomerang_interrupt:vortex_interrupt)(dev->irq,dev);
- - local_irq_restore(flags);
- + local_irq_restore_nort(flags);
- }
- #endif
-
- @@ -1916,12 +1916,12 @@
- * Block interrupts because vortex_interrupt does a bare spin_lock()
- */
- unsigned long flags;
- - local_irq_save(flags);
- + local_irq_save_nort(flags);
- if (vp->full_bus_master_tx)
- boomerang_interrupt(dev->irq, dev);
- else
- vortex_interrupt(dev->irq, dev);
- - local_irq_restore(flags);
- + local_irq_restore_nort(flags);
- }
- }
-
- diff -Nur linux-4.1.39.orig/drivers/net/ethernet/atheros/atl1c/atl1c_main.c linux-4.1.39/drivers/net/ethernet/atheros/atl1c/atl1c_main.c
- --- linux-4.1.39.orig/drivers/net/ethernet/atheros/atl1c/atl1c_main.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/net/ethernet/atheros/atl1c/atl1c_main.c 2017-04-18 17:56:30.589396200 +0200
- @@ -2212,11 +2212,7 @@
- }
-
- tpd_req = atl1c_cal_tpd_req(skb);
- - if (!spin_trylock_irqsave(&adapter->tx_lock, flags)) {
- - if (netif_msg_pktdata(adapter))
- - dev_info(&adapter->pdev->dev, "tx locked\n");
- - return NETDEV_TX_LOCKED;
- - }
- + spin_lock_irqsave(&adapter->tx_lock, flags);
-
- if (atl1c_tpd_avail(adapter, type) < tpd_req) {
- /* no enough descriptor, just stop queue */
- diff -Nur linux-4.1.39.orig/drivers/net/ethernet/atheros/atl1e/atl1e_main.c linux-4.1.39/drivers/net/ethernet/atheros/atl1e/atl1e_main.c
- --- linux-4.1.39.orig/drivers/net/ethernet/atheros/atl1e/atl1e_main.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/net/ethernet/atheros/atl1e/atl1e_main.c 2017-04-18 17:56:30.589396200 +0200
- @@ -1880,8 +1880,7 @@
- return NETDEV_TX_OK;
- }
- tpd_req = atl1e_cal_tdp_req(skb);
- - if (!spin_trylock_irqsave(&adapter->tx_lock, flags))
- - return NETDEV_TX_LOCKED;
- + spin_lock_irqsave(&adapter->tx_lock, flags);
-
- if (atl1e_tpd_avail(adapter) < tpd_req) {
- /* no enough descriptor, just stop queue */
- diff -Nur linux-4.1.39.orig/drivers/net/ethernet/chelsio/cxgb/sge.c linux-4.1.39/drivers/net/ethernet/chelsio/cxgb/sge.c
- --- linux-4.1.39.orig/drivers/net/ethernet/chelsio/cxgb/sge.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/net/ethernet/chelsio/cxgb/sge.c 2017-04-18 17:56:30.589396200 +0200
- @@ -1664,8 +1664,7 @@
- struct cmdQ *q = &sge->cmdQ[qid];
- unsigned int credits, pidx, genbit, count, use_sched_skb = 0;
-
- - if (!spin_trylock(&q->lock))
- - return NETDEV_TX_LOCKED;
- + spin_lock(&q->lock);
-
- reclaim_completed_tx(sge, q);
-
- diff -Nur linux-4.1.39.orig/drivers/net/ethernet/freescale/gianfar.c linux-4.1.39/drivers/net/ethernet/freescale/gianfar.c
- --- linux-4.1.39.orig/drivers/net/ethernet/freescale/gianfar.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/net/ethernet/freescale/gianfar.c 2017-04-18 17:56:30.589396200 +0200
- @@ -1540,7 +1540,7 @@
-
- if (netif_running(ndev)) {
-
- - local_irq_save(flags);
- + local_irq_save_nort(flags);
- lock_tx_qs(priv);
-
- gfar_halt_nodisable(priv);
- @@ -1556,7 +1556,7 @@
- gfar_write(®s->maccfg1, tempval);
-
- unlock_tx_qs(priv);
- - local_irq_restore(flags);
- + local_irq_restore_nort(flags);
-
- disable_napi(priv);
-
- @@ -1598,7 +1598,7 @@
- /* Disable Magic Packet mode, in case something
- * else woke us up.
- */
- - local_irq_save(flags);
- + local_irq_save_nort(flags);
- lock_tx_qs(priv);
-
- tempval = gfar_read(®s->maccfg2);
- @@ -1608,7 +1608,7 @@
- gfar_start(priv);
-
- unlock_tx_qs(priv);
- - local_irq_restore(flags);
- + local_irq_restore_nort(flags);
-
- netif_device_attach(ndev);
-
- @@ -3418,14 +3418,14 @@
- dev->stats.tx_dropped++;
- atomic64_inc(&priv->extra_stats.tx_underrun);
-
- - local_irq_save(flags);
- + local_irq_save_nort(flags);
- lock_tx_qs(priv);
-
- /* Reactivate the Tx Queues */
- gfar_write(®s->tstat, gfargrp->tstat);
-
- unlock_tx_qs(priv);
- - local_irq_restore(flags);
- + local_irq_restore_nort(flags);
- }
- netif_dbg(priv, tx_err, dev, "Transmit Error\n");
- }
- diff -Nur linux-4.1.39.orig/drivers/net/ethernet/neterion/s2io.c linux-4.1.39/drivers/net/ethernet/neterion/s2io.c
- --- linux-4.1.39.orig/drivers/net/ethernet/neterion/s2io.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/net/ethernet/neterion/s2io.c 2017-04-18 17:56:30.589396200 +0200
- @@ -4084,12 +4084,7 @@
- [skb->priority & (MAX_TX_FIFOS - 1)];
- fifo = &mac_control->fifos[queue];
-
- - if (do_spin_lock)
- - spin_lock_irqsave(&fifo->tx_lock, flags);
- - else {
- - if (unlikely(!spin_trylock_irqsave(&fifo->tx_lock, flags)))
- - return NETDEV_TX_LOCKED;
- - }
- + spin_lock_irqsave(&fifo->tx_lock, flags);
-
- if (sp->config.multiq) {
- if (__netif_subqueue_stopped(dev, fifo->fifo_no)) {
- diff -Nur linux-4.1.39.orig/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c linux-4.1.39/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c
- --- linux-4.1.39.orig/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c 2017-04-18 17:56:30.589396200 +0200
- @@ -2137,10 +2137,8 @@
- struct pch_gbe_tx_ring *tx_ring = adapter->tx_ring;
- unsigned long flags;
-
- - if (!spin_trylock_irqsave(&tx_ring->tx_lock, flags)) {
- - /* Collision - tell upper layer to requeue */
- - return NETDEV_TX_LOCKED;
- - }
- + spin_lock_irqsave(&tx_ring->tx_lock, flags);
- +
- if (unlikely(!PCH_GBE_DESC_UNUSED(tx_ring))) {
- netif_stop_queue(netdev);
- spin_unlock_irqrestore(&tx_ring->tx_lock, flags);
- diff -Nur linux-4.1.39.orig/drivers/net/ethernet/realtek/8139too.c linux-4.1.39/drivers/net/ethernet/realtek/8139too.c
- --- linux-4.1.39.orig/drivers/net/ethernet/realtek/8139too.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/net/ethernet/realtek/8139too.c 2017-04-18 17:56:30.593396355 +0200
- @@ -2229,7 +2229,7 @@
- struct rtl8139_private *tp = netdev_priv(dev);
- const int irq = tp->pci_dev->irq;
-
- - disable_irq(irq);
- + disable_irq_nosync(irq);
- rtl8139_interrupt(irq, dev);
- enable_irq(irq);
- }
- diff -Nur linux-4.1.39.orig/drivers/net/ethernet/tehuti/tehuti.c linux-4.1.39/drivers/net/ethernet/tehuti/tehuti.c
- --- linux-4.1.39.orig/drivers/net/ethernet/tehuti/tehuti.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/net/ethernet/tehuti/tehuti.c 2017-04-18 17:56:30.593396355 +0200
- @@ -1629,13 +1629,8 @@
- unsigned long flags;
-
- ENTER;
- - local_irq_save(flags);
- - if (!spin_trylock(&priv->tx_lock)) {
- - local_irq_restore(flags);
- - DBG("%s[%s]: TX locked, returning NETDEV_TX_LOCKED\n",
- - BDX_DRV_NAME, ndev->name);
- - return NETDEV_TX_LOCKED;
- - }
- +
- + spin_lock_irqsave(&priv->tx_lock, flags);
-
- /* build tx descriptor */
- BDX_ASSERT(f->m.wptr >= f->m.memsz); /* started with valid wptr */
- diff -Nur linux-4.1.39.orig/drivers/net/rionet.c linux-4.1.39/drivers/net/rionet.c
- --- linux-4.1.39.orig/drivers/net/rionet.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/net/rionet.c 2017-04-18 17:56:30.593396355 +0200
- @@ -174,11 +174,7 @@
- unsigned long flags;
- int add_num = 1;
-
- - local_irq_save(flags);
- - if (!spin_trylock(&rnet->tx_lock)) {
- - local_irq_restore(flags);
- - return NETDEV_TX_LOCKED;
- - }
- + spin_lock_irqsave(&rnet->tx_lock, flags);
-
- if (is_multicast_ether_addr(eth->h_dest))
- add_num = nets[rnet->mport->id].nact;
- diff -Nur linux-4.1.39.orig/drivers/net/wireless/orinoco/orinoco_usb.c linux-4.1.39/drivers/net/wireless/orinoco/orinoco_usb.c
- --- linux-4.1.39.orig/drivers/net/wireless/orinoco/orinoco_usb.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/net/wireless/orinoco/orinoco_usb.c 2017-04-18 17:56:30.593396355 +0200
- @@ -697,7 +697,7 @@
- while (!ctx->done.done && msecs--)
- udelay(1000);
- } else {
- - wait_event_interruptible(ctx->done.wait,
- + swait_event_interruptible(ctx->done.wait,
- ctx->done.done);
- }
- break;
- diff -Nur linux-4.1.39.orig/drivers/pci/access.c linux-4.1.39/drivers/pci/access.c
- --- linux-4.1.39.orig/drivers/pci/access.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/pci/access.c 2017-04-18 17:56:30.593396355 +0200
- @@ -561,7 +561,7 @@
- WARN_ON(!dev->block_cfg_access);
-
- dev->block_cfg_access = 0;
- - wake_up_all(&pci_cfg_wait);
- + wake_up_all_locked(&pci_cfg_wait);
- raw_spin_unlock_irqrestore(&pci_lock, flags);
- }
- EXPORT_SYMBOL_GPL(pci_cfg_access_unlock);
- diff -Nur linux-4.1.39.orig/drivers/pinctrl/qcom/pinctrl-msm.c linux-4.1.39/drivers/pinctrl/qcom/pinctrl-msm.c
- --- linux-4.1.39.orig/drivers/pinctrl/qcom/pinctrl-msm.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/pinctrl/qcom/pinctrl-msm.c 2017-04-18 17:56:30.593396355 +0200
- @@ -59,7 +59,7 @@
- struct notifier_block restart_nb;
- int irq;
-
- - spinlock_t lock;
- + raw_spinlock_t lock;
-
- DECLARE_BITMAP(dual_edge_irqs, MAX_NR_GPIO);
- DECLARE_BITMAP(enabled_irqs, MAX_NR_GPIO);
- @@ -155,14 +155,14 @@
- if (WARN_ON(i == g->nfuncs))
- return -EINVAL;
-
- - spin_lock_irqsave(&pctrl->lock, flags);
- + raw_spin_lock_irqsave(&pctrl->lock, flags);
-
- val = readl(pctrl->regs + g->ctl_reg);
- val &= ~(0x7 << g->mux_bit);
- val |= i << g->mux_bit;
- writel(val, pctrl->regs + g->ctl_reg);
-
- - spin_unlock_irqrestore(&pctrl->lock, flags);
- + raw_spin_unlock_irqrestore(&pctrl->lock, flags);
-
- return 0;
- }
- @@ -325,14 +325,14 @@
- break;
- case PIN_CONFIG_OUTPUT:
- /* set output value */
- - spin_lock_irqsave(&pctrl->lock, flags);
- + raw_spin_lock_irqsave(&pctrl->lock, flags);
- val = readl(pctrl->regs + g->io_reg);
- if (arg)
- val |= BIT(g->out_bit);
- else
- val &= ~BIT(g->out_bit);
- writel(val, pctrl->regs + g->io_reg);
- - spin_unlock_irqrestore(&pctrl->lock, flags);
- + raw_spin_unlock_irqrestore(&pctrl->lock, flags);
-
- /* enable output */
- arg = 1;
- @@ -353,12 +353,12 @@
- return -EINVAL;
- }
-
- - spin_lock_irqsave(&pctrl->lock, flags);
- + raw_spin_lock_irqsave(&pctrl->lock, flags);
- val = readl(pctrl->regs + g->ctl_reg);
- val &= ~(mask << bit);
- val |= arg << bit;
- writel(val, pctrl->regs + g->ctl_reg);
- - spin_unlock_irqrestore(&pctrl->lock, flags);
- + raw_spin_unlock_irqrestore(&pctrl->lock, flags);
- }
-
- return 0;
- @@ -386,13 +386,13 @@
-
- g = &pctrl->soc->groups[offset];
-
- - spin_lock_irqsave(&pctrl->lock, flags);
- + raw_spin_lock_irqsave(&pctrl->lock, flags);
-
- val = readl(pctrl->regs + g->ctl_reg);
- val &= ~BIT(g->oe_bit);
- writel(val, pctrl->regs + g->ctl_reg);
-
- - spin_unlock_irqrestore(&pctrl->lock, flags);
- + raw_spin_unlock_irqrestore(&pctrl->lock, flags);
-
- return 0;
- }
- @@ -406,7 +406,7 @@
-
- g = &pctrl->soc->groups[offset];
-
- - spin_lock_irqsave(&pctrl->lock, flags);
- + raw_spin_lock_irqsave(&pctrl->lock, flags);
-
- val = readl(pctrl->regs + g->io_reg);
- if (value)
- @@ -419,7 +419,7 @@
- val |= BIT(g->oe_bit);
- writel(val, pctrl->regs + g->ctl_reg);
-
- - spin_unlock_irqrestore(&pctrl->lock, flags);
- + raw_spin_unlock_irqrestore(&pctrl->lock, flags);
-
- return 0;
- }
- @@ -445,7 +445,7 @@
-
- g = &pctrl->soc->groups[offset];
-
- - spin_lock_irqsave(&pctrl->lock, flags);
- + raw_spin_lock_irqsave(&pctrl->lock, flags);
-
- val = readl(pctrl->regs + g->io_reg);
- if (value)
- @@ -454,7 +454,7 @@
- val &= ~BIT(g->out_bit);
- writel(val, pctrl->regs + g->io_reg);
-
- - spin_unlock_irqrestore(&pctrl->lock, flags);
- + raw_spin_unlock_irqrestore(&pctrl->lock, flags);
- }
-
- static int msm_gpio_request(struct gpio_chip *chip, unsigned offset)
- @@ -585,7 +585,7 @@
-
- g = &pctrl->soc->groups[d->hwirq];
-
- - spin_lock_irqsave(&pctrl->lock, flags);
- + raw_spin_lock_irqsave(&pctrl->lock, flags);
-
- val = readl(pctrl->regs + g->intr_cfg_reg);
- val &= ~BIT(g->intr_enable_bit);
- @@ -593,7 +593,7 @@
-
- clear_bit(d->hwirq, pctrl->enabled_irqs);
-
- - spin_unlock_irqrestore(&pctrl->lock, flags);
- + raw_spin_unlock_irqrestore(&pctrl->lock, flags);
- }
-
- static void msm_gpio_irq_unmask(struct irq_data *d)
- @@ -606,7 +606,7 @@
-
- g = &pctrl->soc->groups[d->hwirq];
-
- - spin_lock_irqsave(&pctrl->lock, flags);
- + raw_spin_lock_irqsave(&pctrl->lock, flags);
-
- val = readl(pctrl->regs + g->intr_status_reg);
- val &= ~BIT(g->intr_status_bit);
- @@ -618,7 +618,7 @@
-
- set_bit(d->hwirq, pctrl->enabled_irqs);
-
- - spin_unlock_irqrestore(&pctrl->lock, flags);
- + raw_spin_unlock_irqrestore(&pctrl->lock, flags);
- }
-
- static void msm_gpio_irq_ack(struct irq_data *d)
- @@ -631,7 +631,7 @@
-
- g = &pctrl->soc->groups[d->hwirq];
-
- - spin_lock_irqsave(&pctrl->lock, flags);
- + raw_spin_lock_irqsave(&pctrl->lock, flags);
-
- val = readl(pctrl->regs + g->intr_status_reg);
- if (g->intr_ack_high)
- @@ -643,7 +643,7 @@
- if (test_bit(d->hwirq, pctrl->dual_edge_irqs))
- msm_gpio_update_dual_edge_pos(pctrl, g, d);
-
- - spin_unlock_irqrestore(&pctrl->lock, flags);
- + raw_spin_unlock_irqrestore(&pctrl->lock, flags);
- }
-
- static int msm_gpio_irq_set_type(struct irq_data *d, unsigned int type)
- @@ -656,7 +656,7 @@
-
- g = &pctrl->soc->groups[d->hwirq];
-
- - spin_lock_irqsave(&pctrl->lock, flags);
- + raw_spin_lock_irqsave(&pctrl->lock, flags);
-
- /*
- * For hw without possibility of detecting both edges
- @@ -730,7 +730,7 @@
- if (test_bit(d->hwirq, pctrl->dual_edge_irqs))
- msm_gpio_update_dual_edge_pos(pctrl, g, d);
-
- - spin_unlock_irqrestore(&pctrl->lock, flags);
- + raw_spin_unlock_irqrestore(&pctrl->lock, flags);
-
- if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
- __irq_set_handler_locked(d->irq, handle_level_irq);
- @@ -746,11 +746,11 @@
- struct msm_pinctrl *pctrl = to_msm_pinctrl(gc);
- unsigned long flags;
-
- - spin_lock_irqsave(&pctrl->lock, flags);
- + raw_spin_lock_irqsave(&pctrl->lock, flags);
-
- irq_set_irq_wake(pctrl->irq, on);
-
- - spin_unlock_irqrestore(&pctrl->lock, flags);
- + raw_spin_unlock_irqrestore(&pctrl->lock, flags);
-
- return 0;
- }
- @@ -887,7 +887,7 @@
- pctrl->soc = soc_data;
- pctrl->chip = msm_gpio_template;
-
- - spin_lock_init(&pctrl->lock);
- + raw_spin_lock_init(&pctrl->lock);
-
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- pctrl->regs = devm_ioremap_resource(&pdev->dev, res);
- diff -Nur linux-4.1.39.orig/drivers/scsi/fcoe/fcoe.c linux-4.1.39/drivers/scsi/fcoe/fcoe.c
- --- linux-4.1.39.orig/drivers/scsi/fcoe/fcoe.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/scsi/fcoe/fcoe.c 2017-04-18 17:56:30.593396355 +0200
- @@ -1287,7 +1287,7 @@
- struct sk_buff *skb;
- #ifdef CONFIG_SMP
- struct fcoe_percpu_s *p0;
- - unsigned targ_cpu = get_cpu();
- + unsigned targ_cpu = get_cpu_light();
- #endif /* CONFIG_SMP */
-
- FCOE_DBG("Destroying receive thread for CPU %d\n", cpu);
- @@ -1343,7 +1343,7 @@
- kfree_skb(skb);
- spin_unlock_bh(&p->fcoe_rx_list.lock);
- }
- - put_cpu();
- + put_cpu_light();
- #else
- /*
- * This a non-SMP scenario where the singular Rx thread is
- @@ -1567,11 +1567,11 @@
- static int fcoe_alloc_paged_crc_eof(struct sk_buff *skb, int tlen)
- {
- struct fcoe_percpu_s *fps;
- - int rc;
- + int rc, cpu = get_cpu_light();
-
- - fps = &get_cpu_var(fcoe_percpu);
- + fps = &per_cpu(fcoe_percpu, cpu);
- rc = fcoe_get_paged_crc_eof(skb, tlen, fps);
- - put_cpu_var(fcoe_percpu);
- + put_cpu_light();
-
- return rc;
- }
- @@ -1767,11 +1767,11 @@
- return 0;
- }
-
- - stats = per_cpu_ptr(lport->stats, get_cpu());
- + stats = per_cpu_ptr(lport->stats, get_cpu_light());
- stats->InvalidCRCCount++;
- if (stats->InvalidCRCCount < 5)
- printk(KERN_WARNING "fcoe: dropping frame with CRC error\n");
- - put_cpu();
- + put_cpu_light();
- return -EINVAL;
- }
-
- @@ -1815,7 +1815,7 @@
- */
- hp = (struct fcoe_hdr *) skb_network_header(skb);
-
- - stats = per_cpu_ptr(lport->stats, get_cpu());
- + stats = per_cpu_ptr(lport->stats, get_cpu_light());
- if (unlikely(FC_FCOE_DECAPS_VER(hp) != FC_FCOE_VER)) {
- if (stats->ErrorFrames < 5)
- printk(KERN_WARNING "fcoe: FCoE version "
- @@ -1847,13 +1847,13 @@
- goto drop;
-
- if (!fcoe_filter_frames(lport, fp)) {
- - put_cpu();
- + put_cpu_light();
- fc_exch_recv(lport, fp);
- return;
- }
- drop:
- stats->ErrorFrames++;
- - put_cpu();
- + put_cpu_light();
- kfree_skb(skb);
- }
-
- diff -Nur linux-4.1.39.orig/drivers/scsi/fcoe/fcoe_ctlr.c linux-4.1.39/drivers/scsi/fcoe/fcoe_ctlr.c
- --- linux-4.1.39.orig/drivers/scsi/fcoe/fcoe_ctlr.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/scsi/fcoe/fcoe_ctlr.c 2017-04-18 17:56:30.593396355 +0200
- @@ -831,7 +831,7 @@
-
- INIT_LIST_HEAD(&del_list);
-
- - stats = per_cpu_ptr(fip->lp->stats, get_cpu());
- + stats = per_cpu_ptr(fip->lp->stats, get_cpu_light());
-
- list_for_each_entry_safe(fcf, next, &fip->fcfs, list) {
- deadline = fcf->time + fcf->fka_period + fcf->fka_period / 2;
- @@ -867,7 +867,7 @@
- sel_time = fcf->time;
- }
- }
- - put_cpu();
- + put_cpu_light();
-
- list_for_each_entry_safe(fcf, next, &del_list, list) {
- /* Removes fcf from current list */
- diff -Nur linux-4.1.39.orig/drivers/scsi/libfc/fc_exch.c linux-4.1.39/drivers/scsi/libfc/fc_exch.c
- --- linux-4.1.39.orig/drivers/scsi/libfc/fc_exch.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/scsi/libfc/fc_exch.c 2017-04-18 17:56:30.593396355 +0200
- @@ -814,10 +814,10 @@
- }
- memset(ep, 0, sizeof(*ep));
-
- - cpu = get_cpu();
- + cpu = get_cpu_light();
- pool = per_cpu_ptr(mp->pool, cpu);
- spin_lock_bh(&pool->lock);
- - put_cpu();
- + put_cpu_light();
-
- /* peek cache of free slot */
- if (pool->left != FC_XID_UNKNOWN) {
- diff -Nur linux-4.1.39.orig/drivers/scsi/libsas/sas_ata.c linux-4.1.39/drivers/scsi/libsas/sas_ata.c
- --- linux-4.1.39.orig/drivers/scsi/libsas/sas_ata.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/scsi/libsas/sas_ata.c 2017-04-18 17:56:30.593396355 +0200
- @@ -190,7 +190,7 @@
- /* TODO: audit callers to ensure they are ready for qc_issue to
- * unconditionally re-enable interrupts
- */
- - local_irq_save(flags);
- + local_irq_save_nort(flags);
- spin_unlock(ap->lock);
-
- /* If the device fell off, no sense in issuing commands */
- @@ -255,7 +255,7 @@
-
- out:
- spin_lock(ap->lock);
- - local_irq_restore(flags);
- + local_irq_restore_nort(flags);
- return ret;
- }
-
- diff -Nur linux-4.1.39.orig/drivers/scsi/qla2xxx/qla_inline.h linux-4.1.39/drivers/scsi/qla2xxx/qla_inline.h
- --- linux-4.1.39.orig/drivers/scsi/qla2xxx/qla_inline.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/scsi/qla2xxx/qla_inline.h 2017-04-18 17:56:30.593396355 +0200
- @@ -59,12 +59,12 @@
- {
- unsigned long flags;
- struct qla_hw_data *ha = rsp->hw;
- - local_irq_save(flags);
- + local_irq_save_nort(flags);
- if (IS_P3P_TYPE(ha))
- qla82xx_poll(0, rsp);
- else
- ha->isp_ops->intr_handler(0, rsp);
- - local_irq_restore(flags);
- + local_irq_restore_nort(flags);
- }
-
- static inline uint8_t *
- diff -Nur linux-4.1.39.orig/drivers/thermal/x86_pkg_temp_thermal.c linux-4.1.39/drivers/thermal/x86_pkg_temp_thermal.c
- --- linux-4.1.39.orig/drivers/thermal/x86_pkg_temp_thermal.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/thermal/x86_pkg_temp_thermal.c 2017-04-18 17:56:30.593396355 +0200
- @@ -29,6 +29,7 @@
- #include <linux/pm.h>
- #include <linux/thermal.h>
- #include <linux/debugfs.h>
- +#include <linux/work-simple.h>
- #include <asm/cpu_device_id.h>
- #include <asm/mce.h>
-
- @@ -352,7 +353,7 @@
- }
- }
-
- -static int pkg_temp_thermal_platform_thermal_notify(__u64 msr_val)
- +static void platform_thermal_notify_work(struct swork_event *event)
- {
- unsigned long flags;
- int cpu = smp_processor_id();
- @@ -369,7 +370,7 @@
- pkg_work_scheduled[phy_id]) {
- disable_pkg_thres_interrupt();
- spin_unlock_irqrestore(&pkg_work_lock, flags);
- - return -EINVAL;
- + return;
- }
- pkg_work_scheduled[phy_id] = 1;
- spin_unlock_irqrestore(&pkg_work_lock, flags);
- @@ -378,9 +379,48 @@
- schedule_delayed_work_on(cpu,
- &per_cpu(pkg_temp_thermal_threshold_work, cpu),
- msecs_to_jiffies(notify_delay_ms));
- +}
- +
- +#ifdef CONFIG_PREEMPT_RT_FULL
- +static struct swork_event notify_work;
- +
- +static int thermal_notify_work_init(void)
- +{
- + int err;
- +
- + err = swork_get();
- + if (err)
- + return err;
- +
- + INIT_SWORK(¬ify_work, platform_thermal_notify_work);
- return 0;
- }
-
- +static void thermal_notify_work_cleanup(void)
- +{
- + swork_put();
- +}
- +
- +static int pkg_temp_thermal_platform_thermal_notify(__u64 msr_val)
- +{
- + swork_queue(¬ify_work);
- + return 0;
- +}
- +
- +#else /* !CONFIG_PREEMPT_RT_FULL */
- +
- +static int thermal_notify_work_init(void) { return 0; }
- +
- +static void thermal_notify_work_cleanup(void) { }
- +
- +static int pkg_temp_thermal_platform_thermal_notify(__u64 msr_val)
- +{
- + platform_thermal_notify_work(NULL);
- +
- + return 0;
- +}
- +#endif /* CONFIG_PREEMPT_RT_FULL */
- +
- static int find_siblings_cpu(int cpu)
- {
- int i;
- @@ -584,6 +624,9 @@
- if (!x86_match_cpu(pkg_temp_thermal_ids))
- return -ENODEV;
-
- + if (!thermal_notify_work_init())
- + return -ENODEV;
- +
- spin_lock_init(&pkg_work_lock);
- platform_thermal_package_notify =
- pkg_temp_thermal_platform_thermal_notify;
- @@ -608,7 +651,7 @@
- kfree(pkg_work_scheduled);
- platform_thermal_package_notify = NULL;
- platform_thermal_package_rate_control = NULL;
- -
- + thermal_notify_work_cleanup();
- return -ENODEV;
- }
-
- @@ -633,6 +676,7 @@
- mutex_unlock(&phy_dev_list_mutex);
- platform_thermal_package_notify = NULL;
- platform_thermal_package_rate_control = NULL;
- + thermal_notify_work_cleanup();
- for_each_online_cpu(i)
- cancel_delayed_work_sync(
- &per_cpu(pkg_temp_thermal_threshold_work, i));
- diff -Nur linux-4.1.39.orig/drivers/tty/serial/8250/8250_core.c linux-4.1.39/drivers/tty/serial/8250/8250_core.c
- --- linux-4.1.39.orig/drivers/tty/serial/8250/8250_core.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/tty/serial/8250/8250_core.c 2017-04-18 17:56:30.593396355 +0200
- @@ -36,6 +36,7 @@
- #include <linux/nmi.h>
- #include <linux/mutex.h>
- #include <linux/slab.h>
- +#include <linux/kdb.h>
- #include <linux/uaccess.h>
- #include <linux/pm_runtime.h>
- #ifdef CONFIG_SPARC
- @@ -80,7 +81,16 @@
- #define DEBUG_INTR(fmt...) do { } while (0)
- #endif
-
- -#define PASS_LIMIT 512
- +/*
- + * On -rt we can have a more delays, and legitimately
- + * so - so don't drop work spuriously and spam the
- + * syslog:
- + */
- +#ifdef CONFIG_PREEMPT_RT_FULL
- +# define PASS_LIMIT 1000000
- +#else
- +# define PASS_LIMIT 512
- +#endif
-
- #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
-
- @@ -3366,7 +3376,7 @@
-
- if (port->sysrq)
- locked = 0;
- - else if (oops_in_progress)
- + else if (oops_in_progress || in_kdb_printk())
- locked = spin_trylock_irqsave(&port->lock, flags);
- else
- spin_lock_irqsave(&port->lock, flags);
- diff -Nur linux-4.1.39.orig/drivers/tty/serial/amba-pl011.c linux-4.1.39/drivers/tty/serial/amba-pl011.c
- --- linux-4.1.39.orig/drivers/tty/serial/amba-pl011.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/tty/serial/amba-pl011.c 2017-04-18 17:56:30.597396510 +0200
- @@ -2000,13 +2000,19 @@
-
- clk_enable(uap->clk);
-
- - local_irq_save(flags);
- + /*
- + * local_irq_save(flags);
- + *
- + * This local_irq_save() is nonsense. If we come in via sysrq
- + * handling then interrupts are already disabled. Aside of
- + * that the port.sysrq check is racy on SMP regardless.
- + */
- if (uap->port.sysrq)
- locked = 0;
- else if (oops_in_progress)
- - locked = spin_trylock(&uap->port.lock);
- + locked = spin_trylock_irqsave(&uap->port.lock, flags);
- else
- - spin_lock(&uap->port.lock);
- + spin_lock_irqsave(&uap->port.lock, flags);
-
- /*
- * First save the CR then disable the interrupts
- @@ -2028,8 +2034,7 @@
- writew(old_cr, uap->port.membase + UART011_CR);
-
- if (locked)
- - spin_unlock(&uap->port.lock);
- - local_irq_restore(flags);
- + spin_unlock_irqrestore(&uap->port.lock, flags);
-
- clk_disable(uap->clk);
- }
- diff -Nur linux-4.1.39.orig/drivers/tty/serial/omap-serial.c linux-4.1.39/drivers/tty/serial/omap-serial.c
- --- linux-4.1.39.orig/drivers/tty/serial/omap-serial.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/tty/serial/omap-serial.c 2017-04-18 17:56:30.597396510 +0200
- @@ -1282,13 +1282,10 @@
-
- pm_runtime_get_sync(up->dev);
-
- - local_irq_save(flags);
- - if (up->port.sysrq)
- - locked = 0;
- - else if (oops_in_progress)
- - locked = spin_trylock(&up->port.lock);
- + if (up->port.sysrq || oops_in_progress)
- + locked = spin_trylock_irqsave(&up->port.lock, flags);
- else
- - spin_lock(&up->port.lock);
- + spin_lock_irqsave(&up->port.lock, flags);
-
- /*
- * First save the IER then disable the interrupts
- @@ -1317,8 +1314,7 @@
- pm_runtime_mark_last_busy(up->dev);
- pm_runtime_put_autosuspend(up->dev);
- if (locked)
- - spin_unlock(&up->port.lock);
- - local_irq_restore(flags);
- + spin_unlock_irqrestore(&up->port.lock, flags);
- }
-
- static int __init
- diff -Nur linux-4.1.39.orig/drivers/usb/core/hcd.c linux-4.1.39/drivers/usb/core/hcd.c
- --- linux-4.1.39.orig/drivers/usb/core/hcd.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/usb/core/hcd.c 2017-04-18 17:56:30.597396510 +0200
- @@ -1684,9 +1684,9 @@
- * and no one may trigger the above deadlock situation when
- * running complete() in tasklet.
- */
- - local_irq_save(flags);
- + local_irq_save_nort(flags);
- urb->complete(urb);
- - local_irq_restore(flags);
- + local_irq_restore_nort(flags);
-
- usb_anchor_resume_wakeups(anchor);
- atomic_dec(&urb->use_count);
- diff -Nur linux-4.1.39.orig/drivers/usb/gadget/function/f_fs.c linux-4.1.39/drivers/usb/gadget/function/f_fs.c
- --- linux-4.1.39.orig/drivers/usb/gadget/function/f_fs.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/usb/gadget/function/f_fs.c 2017-04-18 17:56:30.597396510 +0200
- @@ -1404,7 +1404,7 @@
- pr_info("%s(): freeing\n", __func__);
- ffs_data_clear(ffs);
- BUG_ON(waitqueue_active(&ffs->ev.waitq) ||
- - waitqueue_active(&ffs->ep0req_completion.wait));
- + swaitqueue_active(&ffs->ep0req_completion.wait));
- kfree(ffs->dev_name);
- kfree(ffs);
- }
- diff -Nur linux-4.1.39.orig/drivers/usb/gadget/legacy/inode.c linux-4.1.39/drivers/usb/gadget/legacy/inode.c
- --- linux-4.1.39.orig/drivers/usb/gadget/legacy/inode.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/usb/gadget/legacy/inode.c 2017-04-18 17:56:30.597396510 +0200
- @@ -345,7 +345,7 @@
- spin_unlock_irq (&epdata->dev->lock);
-
- if (likely (value == 0)) {
- - value = wait_event_interruptible (done.wait, done.done);
- + value = swait_event_interruptible (done.wait, done.done);
- if (value != 0) {
- spin_lock_irq (&epdata->dev->lock);
- if (likely (epdata->ep != NULL)) {
- @@ -354,7 +354,7 @@
- usb_ep_dequeue (epdata->ep, epdata->req);
- spin_unlock_irq (&epdata->dev->lock);
-
- - wait_event (done.wait, done.done);
- + swait_event (done.wait, done.done);
- if (epdata->status == -ECONNRESET)
- epdata->status = -EINTR;
- } else {
- diff -Nur linux-4.1.39.orig/drivers/usb/gadget/udc/atmel_usba_udc.c linux-4.1.39/drivers/usb/gadget/udc/atmel_usba_udc.c
- --- linux-4.1.39.orig/drivers/usb/gadget/udc/atmel_usba_udc.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/usb/gadget/udc/atmel_usba_udc.c 2017-04-18 17:56:30.597396510 +0200
- @@ -17,7 +17,9 @@
- #include <linux/device.h>
- #include <linux/dma-mapping.h>
- #include <linux/list.h>
- +#include <linux/mfd/syscon.h>
- #include <linux/platform_device.h>
- +#include <linux/regmap.h>
- #include <linux/usb/ch9.h>
- #include <linux/usb/gadget.h>
- #include <linux/usb/atmel_usba_udc.h>
- @@ -1889,20 +1891,15 @@
- #ifdef CONFIG_OF
- static void at91sam9rl_toggle_bias(struct usba_udc *udc, int is_on)
- {
- - unsigned int uckr = at91_pmc_read(AT91_CKGR_UCKR);
- -
- - if (is_on)
- - at91_pmc_write(AT91_CKGR_UCKR, uckr | AT91_PMC_BIASEN);
- - else
- - at91_pmc_write(AT91_CKGR_UCKR, uckr & ~(AT91_PMC_BIASEN));
- + regmap_update_bits(udc->pmc, AT91_CKGR_UCKR, AT91_PMC_BIASEN,
- + is_on ? AT91_PMC_BIASEN : 0);
- }
-
- static void at91sam9g45_pulse_bias(struct usba_udc *udc)
- {
- - unsigned int uckr = at91_pmc_read(AT91_CKGR_UCKR);
- -
- - at91_pmc_write(AT91_CKGR_UCKR, uckr & ~(AT91_PMC_BIASEN));
- - at91_pmc_write(AT91_CKGR_UCKR, uckr | AT91_PMC_BIASEN);
- + regmap_update_bits(udc->pmc, AT91_CKGR_UCKR, AT91_PMC_BIASEN, 0);
- + regmap_update_bits(udc->pmc, AT91_CKGR_UCKR, AT91_PMC_BIASEN,
- + AT91_PMC_BIASEN);
- }
-
- static const struct usba_udc_errata at91sam9rl_errata = {
- @@ -1939,6 +1936,9 @@
- return ERR_PTR(-EINVAL);
-
- udc->errata = match->data;
- + udc->pmc = syscon_regmap_lookup_by_compatible("atmel,at91sam9g45-pmc");
- + if (udc->errata && IS_ERR(udc->pmc))
- + return ERR_CAST(udc->pmc);
-
- udc->num_ep = 0;
-
- diff -Nur linux-4.1.39.orig/drivers/usb/gadget/udc/atmel_usba_udc.h linux-4.1.39/drivers/usb/gadget/udc/atmel_usba_udc.h
- --- linux-4.1.39.orig/drivers/usb/gadget/udc/atmel_usba_udc.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/drivers/usb/gadget/udc/atmel_usba_udc.h 2017-04-18 17:56:30.597396510 +0200
- @@ -354,6 +354,8 @@
- struct dentry *debugfs_root;
- struct dentry *debugfs_regs;
- #endif
- +
- + struct regmap *pmc;
- };
-
- static inline struct usba_ep *to_usba_ep(struct usb_ep *ep)
- diff -Nur linux-4.1.39.orig/fs/aio.c linux-4.1.39/fs/aio.c
- --- linux-4.1.39.orig/fs/aio.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/fs/aio.c 2017-04-18 17:56:30.597396510 +0200
- @@ -40,6 +40,7 @@
- #include <linux/ramfs.h>
- #include <linux/percpu-refcount.h>
- #include <linux/mount.h>
- +#include <linux/work-simple.h>
-
- #include <asm/kmap_types.h>
- #include <asm/uaccess.h>
- @@ -115,7 +116,7 @@
- struct page **ring_pages;
- long nr_pages;
-
- - struct work_struct free_work;
- + struct swork_event free_work;
-
- /*
- * signals when all in-flight requests are done
- @@ -253,6 +254,7 @@
- .mount = aio_mount,
- .kill_sb = kill_anon_super,
- };
- + BUG_ON(swork_get());
- aio_mnt = kern_mount(&aio_fs);
- if (IS_ERR(aio_mnt))
- panic("Failed to create aio fs mount.");
- @@ -559,9 +561,9 @@
- return cancel(&kiocb->common);
- }
-
- -static void free_ioctx(struct work_struct *work)
- +static void free_ioctx(struct swork_event *sev)
- {
- - struct kioctx *ctx = container_of(work, struct kioctx, free_work);
- + struct kioctx *ctx = container_of(sev, struct kioctx, free_work);
-
- pr_debug("freeing %p\n", ctx);
-
- @@ -580,8 +582,8 @@
- if (ctx->rq_wait && atomic_dec_and_test(&ctx->rq_wait->count))
- complete(&ctx->rq_wait->comp);
-
- - INIT_WORK(&ctx->free_work, free_ioctx);
- - schedule_work(&ctx->free_work);
- + INIT_SWORK(&ctx->free_work, free_ioctx);
- + swork_queue(&ctx->free_work);
- }
-
- /*
- @@ -589,9 +591,9 @@
- * and ctx->users has dropped to 0, so we know no more kiocbs can be submitted -
- * now it's safe to cancel any that need to be.
- */
- -static void free_ioctx_users(struct percpu_ref *ref)
- +static void free_ioctx_users_work(struct swork_event *sev)
- {
- - struct kioctx *ctx = container_of(ref, struct kioctx, users);
- + struct kioctx *ctx = container_of(sev, struct kioctx, free_work);
- struct aio_kiocb *req;
-
- spin_lock_irq(&ctx->ctx_lock);
- @@ -610,6 +612,14 @@
- percpu_ref_put(&ctx->reqs);
- }
-
- +static void free_ioctx_users(struct percpu_ref *ref)
- +{
- + struct kioctx *ctx = container_of(ref, struct kioctx, users);
- +
- + INIT_SWORK(&ctx->free_work, free_ioctx_users_work);
- + swork_queue(&ctx->free_work);
- +}
- +
- static int ioctx_add_table(struct kioctx *ctx, struct mm_struct *mm)
- {
- unsigned i, new_nr;
- diff -Nur linux-4.1.39.orig/fs/autofs4/autofs_i.h linux-4.1.39/fs/autofs4/autofs_i.h
- --- linux-4.1.39.orig/fs/autofs4/autofs_i.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/fs/autofs4/autofs_i.h 2017-04-18 17:56:30.597396510 +0200
- @@ -34,6 +34,7 @@
- #include <linux/sched.h>
- #include <linux/mount.h>
- #include <linux/namei.h>
- +#include <linux/delay.h>
- #include <asm/current.h>
- #include <asm/uaccess.h>
-
- diff -Nur linux-4.1.39.orig/fs/autofs4/expire.c linux-4.1.39/fs/autofs4/expire.c
- --- linux-4.1.39.orig/fs/autofs4/expire.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/fs/autofs4/expire.c 2017-04-18 17:56:30.597396510 +0200
- @@ -150,7 +150,7 @@
- parent = p->d_parent;
- if (!spin_trylock(&parent->d_lock)) {
- spin_unlock(&p->d_lock);
- - cpu_relax();
- + cpu_chill();
- goto relock;
- }
- spin_unlock(&p->d_lock);
- diff -Nur linux-4.1.39.orig/fs/buffer.c linux-4.1.39/fs/buffer.c
- --- linux-4.1.39.orig/fs/buffer.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/fs/buffer.c 2017-04-18 17:56:30.597396510 +0200
- @@ -301,8 +301,7 @@
- * decide that the page is now completely done.
- */
- first = page_buffers(page);
- - local_irq_save(flags);
- - bit_spin_lock(BH_Uptodate_Lock, &first->b_state);
- + flags = bh_uptodate_lock_irqsave(first);
- clear_buffer_async_read(bh);
- unlock_buffer(bh);
- tmp = bh;
- @@ -315,8 +314,7 @@
- }
- tmp = tmp->b_this_page;
- } while (tmp != bh);
- - bit_spin_unlock(BH_Uptodate_Lock, &first->b_state);
- - local_irq_restore(flags);
- + bh_uptodate_unlock_irqrestore(first, flags);
-
- /*
- * If none of the buffers had errors and they are all
- @@ -328,9 +326,7 @@
- return;
-
- still_busy:
- - bit_spin_unlock(BH_Uptodate_Lock, &first->b_state);
- - local_irq_restore(flags);
- - return;
- + bh_uptodate_unlock_irqrestore(first, flags);
- }
-
- /*
- @@ -358,8 +354,7 @@
- }
-
- first = page_buffers(page);
- - local_irq_save(flags);
- - bit_spin_lock(BH_Uptodate_Lock, &first->b_state);
- + flags = bh_uptodate_lock_irqsave(first);
-
- clear_buffer_async_write(bh);
- unlock_buffer(bh);
- @@ -371,15 +366,12 @@
- }
- tmp = tmp->b_this_page;
- }
- - bit_spin_unlock(BH_Uptodate_Lock, &first->b_state);
- - local_irq_restore(flags);
- + bh_uptodate_unlock_irqrestore(first, flags);
- end_page_writeback(page);
- return;
-
- still_busy:
- - bit_spin_unlock(BH_Uptodate_Lock, &first->b_state);
- - local_irq_restore(flags);
- - return;
- + bh_uptodate_unlock_irqrestore(first, flags);
- }
- EXPORT_SYMBOL(end_buffer_async_write);
-
- @@ -3325,6 +3317,7 @@
- struct buffer_head *ret = kmem_cache_zalloc(bh_cachep, gfp_flags);
- if (ret) {
- INIT_LIST_HEAD(&ret->b_assoc_buffers);
- + buffer_head_init_locks(ret);
- preempt_disable();
- __this_cpu_inc(bh_accounting.nr);
- recalc_bh_state();
- diff -Nur linux-4.1.39.orig/fs/dcache.c linux-4.1.39/fs/dcache.c
- --- linux-4.1.39.orig/fs/dcache.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/fs/dcache.c 2017-04-18 17:56:30.597396510 +0200
- @@ -19,6 +19,7 @@
- #include <linux/mm.h>
- #include <linux/fs.h>
- #include <linux/fsnotify.h>
- +#include <linux/delay.h>
- #include <linux/slab.h>
- #include <linux/init.h>
- #include <linux/hash.h>
- @@ -747,6 +748,8 @@
- */
- void dput(struct dentry *dentry)
- {
- + struct dentry *parent;
- +
- if (unlikely(!dentry))
- return;
-
- @@ -783,9 +786,18 @@
- return;
-
- kill_it:
- - dentry = dentry_kill(dentry);
- - if (dentry) {
- - cond_resched();
- + parent = dentry_kill(dentry);
- + if (parent) {
- + int r;
- +
- + if (parent == dentry) {
- + /* the task with the highest priority won't schedule */
- + r = cond_resched();
- + if (!r)
- + cpu_chill();
- + } else {
- + dentry = parent;
- + }
- goto repeat;
- }
- }
- @@ -2394,7 +2406,7 @@
- if (dentry->d_lockref.count == 1) {
- if (!spin_trylock(&inode->i_lock)) {
- spin_unlock(&dentry->d_lock);
- - cpu_relax();
- + cpu_chill();
- goto again;
- }
- dentry->d_flags &= ~DCACHE_CANT_MOUNT;
- diff -Nur linux-4.1.39.orig/fs/eventpoll.c linux-4.1.39/fs/eventpoll.c
- --- linux-4.1.39.orig/fs/eventpoll.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/fs/eventpoll.c 2017-04-18 17:56:30.601396665 +0200
- @@ -505,12 +505,12 @@
- */
- static void ep_poll_safewake(wait_queue_head_t *wq)
- {
- - int this_cpu = get_cpu();
- + int this_cpu = get_cpu_light();
-
- ep_call_nested(&poll_safewake_ncalls, EP_MAX_NESTS,
- ep_poll_wakeup_proc, NULL, wq, (void *) (long) this_cpu);
-
- - put_cpu();
- + put_cpu_light();
- }
-
- static void ep_remove_wait_queue(struct eppoll_entry *pwq)
- diff -Nur linux-4.1.39.orig/fs/exec.c linux-4.1.39/fs/exec.c
- --- linux-4.1.39.orig/fs/exec.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/fs/exec.c 2017-04-18 17:56:30.601396665 +0200
- @@ -859,12 +859,14 @@
- }
- }
- task_lock(tsk);
- + preempt_disable_rt();
- active_mm = tsk->active_mm;
- tsk->mm = mm;
- tsk->active_mm = mm;
- activate_mm(active_mm, mm);
- tsk->mm->vmacache_seqnum = 0;
- vmacache_flush(tsk);
- + preempt_enable_rt();
- task_unlock(tsk);
- if (old_mm) {
- up_read(&old_mm->mmap_sem);
- diff -Nur linux-4.1.39.orig/fs/f2fs/f2fs.h linux-4.1.39/fs/f2fs/f2fs.h
- --- linux-4.1.39.orig/fs/f2fs/f2fs.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/fs/f2fs/f2fs.h 2017-04-18 17:56:30.601396665 +0200
- @@ -22,7 +22,6 @@
-
- #ifdef CONFIG_F2FS_CHECK_FS
- #define f2fs_bug_on(sbi, condition) BUG_ON(condition)
- -#define f2fs_down_write(x, y) down_write_nest_lock(x, y)
- #else
- #define f2fs_bug_on(sbi, condition) \
- do { \
- @@ -31,7 +30,6 @@
- set_sbi_flag(sbi, SBI_NEED_FSCK); \
- } \
- } while (0)
- -#define f2fs_down_write(x, y) down_write(x)
- #endif
-
- /*
- @@ -838,7 +836,7 @@
-
- static inline void f2fs_lock_all(struct f2fs_sb_info *sbi)
- {
- - f2fs_down_write(&sbi->cp_rwsem, &sbi->cp_mutex);
- + down_write(&sbi->cp_rwsem);
- }
-
- static inline void f2fs_unlock_all(struct f2fs_sb_info *sbi)
- diff -Nur linux-4.1.39.orig/fs/jbd/checkpoint.c linux-4.1.39/fs/jbd/checkpoint.c
- --- linux-4.1.39.orig/fs/jbd/checkpoint.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/fs/jbd/checkpoint.c 2017-04-18 17:56:30.601396665 +0200
- @@ -129,6 +129,8 @@
- if (journal->j_flags & JFS_ABORT)
- return;
- spin_unlock(&journal->j_state_lock);
- + if (current->plug)
- + io_schedule();
- mutex_lock(&journal->j_checkpoint_mutex);
-
- /*
- diff -Nur linux-4.1.39.orig/fs/jbd2/checkpoint.c linux-4.1.39/fs/jbd2/checkpoint.c
- --- linux-4.1.39.orig/fs/jbd2/checkpoint.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/fs/jbd2/checkpoint.c 2017-04-18 17:56:30.601396665 +0200
- @@ -116,6 +116,8 @@
- nblocks = jbd2_space_needed(journal);
- while (jbd2_log_space_left(journal) < nblocks) {
- write_unlock(&journal->j_state_lock);
- + if (current->plug)
- + io_schedule();
- mutex_lock(&journal->j_checkpoint_mutex);
-
- /*
- diff -Nur linux-4.1.39.orig/fs/namespace.c linux-4.1.39/fs/namespace.c
- --- linux-4.1.39.orig/fs/namespace.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/fs/namespace.c 2017-04-18 17:56:30.601396665 +0200
- @@ -14,6 +14,7 @@
- #include <linux/mnt_namespace.h>
- #include <linux/user_namespace.h>
- #include <linux/namei.h>
- +#include <linux/delay.h>
- #include <linux/security.h>
- #include <linux/idr.h>
- #include <linux/init.h> /* init_rootfs */
- @@ -356,8 +357,11 @@
- * incremented count after it has set MNT_WRITE_HOLD.
- */
- smp_mb();
- - while (ACCESS_ONCE(mnt->mnt.mnt_flags) & MNT_WRITE_HOLD)
- - cpu_relax();
- + while (ACCESS_ONCE(mnt->mnt.mnt_flags) & MNT_WRITE_HOLD) {
- + preempt_enable();
- + cpu_chill();
- + preempt_disable();
- + }
- /*
- * After the slowpath clears MNT_WRITE_HOLD, mnt_is_readonly will
- * be set to match its requirements. So we must not load that until
- diff -Nur linux-4.1.39.orig/fs/ntfs/aops.c linux-4.1.39/fs/ntfs/aops.c
- --- linux-4.1.39.orig/fs/ntfs/aops.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/fs/ntfs/aops.c 2017-04-18 17:56:30.601396665 +0200
- @@ -107,8 +107,7 @@
- "0x%llx.", (unsigned long long)bh->b_blocknr);
- }
- first = page_buffers(page);
- - local_irq_save(flags);
- - bit_spin_lock(BH_Uptodate_Lock, &first->b_state);
- + flags = bh_uptodate_lock_irqsave(first);
- clear_buffer_async_read(bh);
- unlock_buffer(bh);
- tmp = bh;
- @@ -123,8 +122,7 @@
- }
- tmp = tmp->b_this_page;
- } while (tmp != bh);
- - bit_spin_unlock(BH_Uptodate_Lock, &first->b_state);
- - local_irq_restore(flags);
- + bh_uptodate_unlock_irqrestore(first, flags);
- /*
- * If none of the buffers had errors then we can set the page uptodate,
- * but we first have to perform the post read mst fixups, if the
- @@ -145,13 +143,13 @@
- recs = PAGE_CACHE_SIZE / rec_size;
- /* Should have been verified before we got here... */
- BUG_ON(!recs);
- - local_irq_save(flags);
- + local_irq_save_nort(flags);
- kaddr = kmap_atomic(page);
- for (i = 0; i < recs; i++)
- post_read_mst_fixup((NTFS_RECORD*)(kaddr +
- i * rec_size), rec_size);
- kunmap_atomic(kaddr);
- - local_irq_restore(flags);
- + local_irq_restore_nort(flags);
- flush_dcache_page(page);
- if (likely(page_uptodate && !PageError(page)))
- SetPageUptodate(page);
- @@ -159,9 +157,7 @@
- unlock_page(page);
- return;
- still_busy:
- - bit_spin_unlock(BH_Uptodate_Lock, &first->b_state);
- - local_irq_restore(flags);
- - return;
- + bh_uptodate_unlock_irqrestore(first, flags);
- }
-
- /**
- diff -Nur linux-4.1.39.orig/fs/timerfd.c linux-4.1.39/fs/timerfd.c
- --- linux-4.1.39.orig/fs/timerfd.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/fs/timerfd.c 2017-04-18 17:56:30.601396665 +0200
- @@ -450,7 +450,10 @@
- break;
- }
- spin_unlock_irq(&ctx->wqh.lock);
- - cpu_relax();
- + if (isalarm(ctx))
- + hrtimer_wait_for_timer(&ctx->t.alarm.timer);
- + else
- + hrtimer_wait_for_timer(&ctx->t.tmr);
- }
-
- /*
- diff -Nur linux-4.1.39.orig/fs/xfs/xfs_inode.c linux-4.1.39/fs/xfs/xfs_inode.c
- --- linux-4.1.39.orig/fs/xfs/xfs_inode.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/fs/xfs/xfs_inode.c 2017-04-18 17:56:30.601396665 +0200
- @@ -164,7 +164,7 @@
- (XFS_MMAPLOCK_SHARED | XFS_MMAPLOCK_EXCL));
- ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) !=
- (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
- - ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_DEP_MASK)) == 0);
- + ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_SUBCLASS_MASK)) == 0);
-
- if (lock_flags & XFS_IOLOCK_EXCL)
- mrupdate_nested(&ip->i_iolock, XFS_IOLOCK_DEP(lock_flags));
- @@ -212,7 +212,7 @@
- (XFS_MMAPLOCK_SHARED | XFS_MMAPLOCK_EXCL));
- ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) !=
- (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
- - ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_DEP_MASK)) == 0);
- + ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_SUBCLASS_MASK)) == 0);
-
- if (lock_flags & XFS_IOLOCK_EXCL) {
- if (!mrtryupdate(&ip->i_iolock))
- @@ -281,7 +281,7 @@
- (XFS_MMAPLOCK_SHARED | XFS_MMAPLOCK_EXCL));
- ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) !=
- (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
- - ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_DEP_MASK)) == 0);
- + ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_SUBCLASS_MASK)) == 0);
- ASSERT(lock_flags != 0);
-
- if (lock_flags & XFS_IOLOCK_EXCL)
- @@ -364,30 +364,38 @@
-
- /*
- * Bump the subclass so xfs_lock_inodes() acquires each lock with a different
- - * value. This shouldn't be called for page fault locking, but we also need to
- - * ensure we don't overrun the number of lockdep subclasses for the iolock or
- - * mmaplock as that is limited to 12 by the mmap lock lockdep annotations.
- + * value. This can be called for any type of inode lock combination, including
- + * parent locking. Care must be taken to ensure we don't overrun the subclass
- + * storage fields in the class mask we build.
- */
- static inline int
- xfs_lock_inumorder(int lock_mode, int subclass)
- {
- + int class = 0;
- +
- + ASSERT(!(lock_mode & (XFS_ILOCK_PARENT | XFS_ILOCK_RTBITMAP |
- + XFS_ILOCK_RTSUM)));
- +
- if (lock_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL)) {
- - ASSERT(subclass + XFS_LOCK_INUMORDER <
- - (1 << (XFS_MMAPLOCK_SHIFT - XFS_IOLOCK_SHIFT)));
- - lock_mode |= (subclass + XFS_LOCK_INUMORDER) << XFS_IOLOCK_SHIFT;
- + ASSERT(subclass <= XFS_IOLOCK_MAX_SUBCLASS);
- + ASSERT(subclass + XFS_IOLOCK_PARENT_VAL <
- + MAX_LOCKDEP_SUBCLASSES);
- + class += subclass << XFS_IOLOCK_SHIFT;
- + if (lock_mode & XFS_IOLOCK_PARENT)
- + class += XFS_IOLOCK_PARENT_VAL << XFS_IOLOCK_SHIFT;
- }
-
- if (lock_mode & (XFS_MMAPLOCK_SHARED|XFS_MMAPLOCK_EXCL)) {
- - ASSERT(subclass + XFS_LOCK_INUMORDER <
- - (1 << (XFS_ILOCK_SHIFT - XFS_MMAPLOCK_SHIFT)));
- - lock_mode |= (subclass + XFS_LOCK_INUMORDER) <<
- - XFS_MMAPLOCK_SHIFT;
- + ASSERT(subclass <= XFS_MMAPLOCK_MAX_SUBCLASS);
- + class += subclass << XFS_MMAPLOCK_SHIFT;
- }
-
- - if (lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL))
- - lock_mode |= (subclass + XFS_LOCK_INUMORDER) << XFS_ILOCK_SHIFT;
- + if (lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)) {
- + ASSERT(subclass <= XFS_ILOCK_MAX_SUBCLASS);
- + class += subclass << XFS_ILOCK_SHIFT;
- + }
-
- - return lock_mode;
- + return (lock_mode & ~XFS_LOCK_SUBCLASS_MASK) | class;
- }
-
- /*
- @@ -399,6 +407,11 @@
- * transaction (such as truncate). This can result in deadlock since the long
- * running trans might need to wait for the inode we just locked in order to
- * push the tail and free space in the log.
- + *
- + * xfs_lock_inodes() can only be used to lock one type of lock at a time -
- + * the iolock, the mmaplock or the ilock, but not more than one at a time. If we
- + * lock more than one at a time, lockdep will report false positives saying we
- + * have violated locking orders.
- */
- void
- xfs_lock_inodes(
- @@ -409,8 +422,29 @@
- int attempts = 0, i, j, try_lock;
- xfs_log_item_t *lp;
-
- - /* currently supports between 2 and 5 inodes */
- + /*
- + * Currently supports between 2 and 5 inodes with exclusive locking. We
- + * support an arbitrary depth of locking here, but absolute limits on
- + * inodes depend on the the type of locking and the limits placed by
- + * lockdep annotations in xfs_lock_inumorder. These are all checked by
- + * the asserts.
- + */
- ASSERT(ips && inodes >= 2 && inodes <= 5);
- + ASSERT(lock_mode & (XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL |
- + XFS_ILOCK_EXCL));
- + ASSERT(!(lock_mode & (XFS_IOLOCK_SHARED | XFS_MMAPLOCK_SHARED |
- + XFS_ILOCK_SHARED)));
- + ASSERT(!(lock_mode & XFS_IOLOCK_EXCL) ||
- + inodes <= XFS_IOLOCK_MAX_SUBCLASS + 1);
- + ASSERT(!(lock_mode & XFS_MMAPLOCK_EXCL) ||
- + inodes <= XFS_MMAPLOCK_MAX_SUBCLASS + 1);
- + ASSERT(!(lock_mode & XFS_ILOCK_EXCL) ||
- + inodes <= XFS_ILOCK_MAX_SUBCLASS + 1);
- +
- + if (lock_mode & XFS_IOLOCK_EXCL) {
- + ASSERT(!(lock_mode & (XFS_MMAPLOCK_EXCL | XFS_ILOCK_EXCL)));
- + } else if (lock_mode & XFS_MMAPLOCK_EXCL)
- + ASSERT(!(lock_mode & XFS_ILOCK_EXCL));
-
- try_lock = 0;
- i = 0;
- diff -Nur linux-4.1.39.orig/fs/xfs/xfs_inode.h linux-4.1.39/fs/xfs/xfs_inode.h
- --- linux-4.1.39.orig/fs/xfs/xfs_inode.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/fs/xfs/xfs_inode.h 2017-04-18 17:56:30.601396665 +0200
- @@ -284,9 +284,9 @@
- * Flags for lockdep annotations.
- *
- * XFS_LOCK_PARENT - for directory operations that require locking a
- - * parent directory inode and a child entry inode. The parent gets locked
- - * with this flag so it gets a lockdep subclass of 1 and the child entry
- - * lock will have a lockdep subclass of 0.
- + * parent directory inode and a child entry inode. IOLOCK requires nesting,
- + * MMAPLOCK does not support this class, ILOCK requires a single subclass
- + * to differentiate parent from child.
- *
- * XFS_LOCK_RTBITMAP/XFS_LOCK_RTSUM - the realtime device bitmap and summary
- * inodes do not participate in the normal lock order, and thus have their
- @@ -295,30 +295,63 @@
- * XFS_LOCK_INUMORDER - for locking several inodes at the some time
- * with xfs_lock_inodes(). This flag is used as the starting subclass
- * and each subsequent lock acquired will increment the subclass by one.
- - * So the first lock acquired will have a lockdep subclass of 4, the
- - * second lock will have a lockdep subclass of 5, and so on. It is
- - * the responsibility of the class builder to shift this to the correct
- - * portion of the lock_mode lockdep mask.
- + * However, MAX_LOCKDEP_SUBCLASSES == 8, which means we are greatly
- + * limited to the subclasses we can represent via nesting. We need at least
- + * 5 inodes nest depth for the ILOCK through rename, and we also have to support
- + * XFS_ILOCK_PARENT, which gives 6 subclasses. Then we have XFS_ILOCK_RTBITMAP
- + * and XFS_ILOCK_RTSUM, which are another 2 unique subclasses, so that's all
- + * 8 subclasses supported by lockdep.
- + *
- + * This also means we have to number the sub-classes in the lowest bits of
- + * the mask we keep, and we have to ensure we never exceed 3 bits of lockdep
- + * mask and we can't use bit-masking to build the subclasses. What a mess.
- + *
- + * Bit layout:
- + *
- + * Bit Lock Region
- + * 16-19 XFS_IOLOCK_SHIFT dependencies
- + * 20-23 XFS_MMAPLOCK_SHIFT dependencies
- + * 24-31 XFS_ILOCK_SHIFT dependencies
- + *
- + * IOLOCK values
- + *
- + * 0-3 subclass value
- + * 4-7 PARENT subclass values
- + *
- + * MMAPLOCK values
- + *
- + * 0-3 subclass value
- + * 4-7 unused
- + *
- + * ILOCK values
- + * 0-4 subclass values
- + * 5 PARENT subclass (not nestable)
- + * 6 RTBITMAP subclass (not nestable)
- + * 7 RTSUM subclass (not nestable)
- + *
- */
- -#define XFS_LOCK_PARENT 1
- -#define XFS_LOCK_RTBITMAP 2
- -#define XFS_LOCK_RTSUM 3
- -#define XFS_LOCK_INUMORDER 4
- -
- -#define XFS_IOLOCK_SHIFT 16
- -#define XFS_IOLOCK_PARENT (XFS_LOCK_PARENT << XFS_IOLOCK_SHIFT)
- +#define XFS_IOLOCK_SHIFT 16
- +#define XFS_IOLOCK_PARENT_VAL 4
- +#define XFS_IOLOCK_MAX_SUBCLASS (XFS_IOLOCK_PARENT_VAL - 1)
- +#define XFS_IOLOCK_DEP_MASK 0x000f0000
- +#define XFS_IOLOCK_PARENT (XFS_IOLOCK_PARENT_VAL << XFS_IOLOCK_SHIFT)
-
- -#define XFS_MMAPLOCK_SHIFT 20
- +#define XFS_MMAPLOCK_SHIFT 20
- +#define XFS_MMAPLOCK_NUMORDER 0
- +#define XFS_MMAPLOCK_MAX_SUBCLASS 3
- +#define XFS_MMAPLOCK_DEP_MASK 0x00f00000
-
- -#define XFS_ILOCK_SHIFT 24
- -#define XFS_ILOCK_PARENT (XFS_LOCK_PARENT << XFS_ILOCK_SHIFT)
- -#define XFS_ILOCK_RTBITMAP (XFS_LOCK_RTBITMAP << XFS_ILOCK_SHIFT)
- -#define XFS_ILOCK_RTSUM (XFS_LOCK_RTSUM << XFS_ILOCK_SHIFT)
- +#define XFS_ILOCK_SHIFT 24
- +#define XFS_ILOCK_PARENT_VAL 5
- +#define XFS_ILOCK_MAX_SUBCLASS (XFS_ILOCK_PARENT_VAL - 1)
- +#define XFS_ILOCK_RTBITMAP_VAL 6
- +#define XFS_ILOCK_RTSUM_VAL 7
- +#define XFS_ILOCK_DEP_MASK 0xff000000
- +#define XFS_ILOCK_PARENT (XFS_ILOCK_PARENT_VAL << XFS_ILOCK_SHIFT)
- +#define XFS_ILOCK_RTBITMAP (XFS_ILOCK_RTBITMAP_VAL << XFS_ILOCK_SHIFT)
- +#define XFS_ILOCK_RTSUM (XFS_ILOCK_RTSUM_VAL << XFS_ILOCK_SHIFT)
-
- -#define XFS_IOLOCK_DEP_MASK 0x000f0000
- -#define XFS_MMAPLOCK_DEP_MASK 0x00f00000
- -#define XFS_ILOCK_DEP_MASK 0xff000000
- -#define XFS_LOCK_DEP_MASK (XFS_IOLOCK_DEP_MASK | \
- +#define XFS_LOCK_SUBCLASS_MASK (XFS_IOLOCK_DEP_MASK | \
- XFS_MMAPLOCK_DEP_MASK | \
- XFS_ILOCK_DEP_MASK)
-
- diff -Nur linux-4.1.39.orig/include/acpi/platform/aclinux.h linux-4.1.39/include/acpi/platform/aclinux.h
- --- linux-4.1.39.orig/include/acpi/platform/aclinux.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/acpi/platform/aclinux.h 2017-04-18 17:56:30.601396665 +0200
- @@ -123,6 +123,7 @@
-
- #define acpi_cache_t struct kmem_cache
- #define acpi_spinlock spinlock_t *
- +#define acpi_raw_spinlock raw_spinlock_t *
- #define acpi_cpu_flags unsigned long
-
- /* Use native linux version of acpi_os_allocate_zeroed */
- @@ -141,6 +142,20 @@
- #define ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_get_thread_id
- #define ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_create_lock
-
- +#define acpi_os_create_raw_lock(__handle) \
- +({ \
- + raw_spinlock_t *lock = ACPI_ALLOCATE(sizeof(*lock)); \
- + \
- + if (lock) { \
- + *(__handle) = lock; \
- + raw_spin_lock_init(*(__handle)); \
- + } \
- + lock ? AE_OK : AE_NO_MEMORY; \
- + })
- +
- +#define acpi_os_delete_raw_lock(__handle) kfree(__handle)
- +
- +
- /*
- * OSL interfaces used by debugger/disassembler
- */
- diff -Nur linux-4.1.39.orig/include/asm-generic/bug.h linux-4.1.39/include/asm-generic/bug.h
- --- linux-4.1.39.orig/include/asm-generic/bug.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/asm-generic/bug.h 2017-04-18 17:56:30.601396665 +0200
- @@ -206,6 +206,20 @@
- # define WARN_ON_SMP(x) ({0;})
- #endif
-
- +#ifdef CONFIG_PREEMPT_RT_BASE
- +# define BUG_ON_RT(c) BUG_ON(c)
- +# define BUG_ON_NONRT(c) do { } while (0)
- +# define WARN_ON_RT(condition) WARN_ON(condition)
- +# define WARN_ON_NONRT(condition) do { } while (0)
- +# define WARN_ON_ONCE_NONRT(condition) do { } while (0)
- +#else
- +# define BUG_ON_RT(c) do { } while (0)
- +# define BUG_ON_NONRT(c) BUG_ON(c)
- +# define WARN_ON_RT(condition) do { } while (0)
- +# define WARN_ON_NONRT(condition) WARN_ON(condition)
- +# define WARN_ON_ONCE_NONRT(condition) WARN_ON_ONCE(condition)
- +#endif
- +
- #endif /* __ASSEMBLY__ */
-
- #endif
- diff -Nur linux-4.1.39.orig/include/asm-generic/futex.h linux-4.1.39/include/asm-generic/futex.h
- --- linux-4.1.39.orig/include/asm-generic/futex.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/asm-generic/futex.h 2017-04-18 17:56:30.601396665 +0200
- @@ -8,8 +8,7 @@
- #ifndef CONFIG_SMP
- /*
- * The following implementation only for uniprocessor machines.
- - * For UP, it's relies on the fact that pagefault_disable() also disables
- - * preemption to ensure mutual exclusion.
- + * It relies on preempt_disable() ensuring mutual exclusion.
- *
- */
-
- @@ -38,6 +37,7 @@
- if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
- oparg = 1 << oparg;
-
- + preempt_disable();
- pagefault_disable();
-
- ret = -EFAULT;
- @@ -72,6 +72,7 @@
-
- out_pagefault_enable:
- pagefault_enable();
- + preempt_enable();
-
- if (ret == 0) {
- switch (cmp) {
- @@ -106,6 +107,7 @@
- {
- u32 val;
-
- + preempt_disable();
- if (unlikely(get_user(val, uaddr) != 0))
- return -EFAULT;
-
- @@ -113,6 +115,7 @@
- return -EFAULT;
-
- *uval = val;
- + preempt_enable();
-
- return 0;
- }
- diff -Nur linux-4.1.39.orig/include/asm-generic/preempt.h linux-4.1.39/include/asm-generic/preempt.h
- --- linux-4.1.39.orig/include/asm-generic/preempt.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/asm-generic/preempt.h 2017-04-18 17:56:30.601396665 +0200
- @@ -7,10 +7,10 @@
-
- static __always_inline int preempt_count(void)
- {
- - return current_thread_info()->preempt_count;
- + return READ_ONCE(current_thread_info()->preempt_count);
- }
-
- -static __always_inline int *preempt_count_ptr(void)
- +static __always_inline volatile int *preempt_count_ptr(void)
- {
- return ¤t_thread_info()->preempt_count;
- }
- diff -Nur linux-4.1.39.orig/include/linux/blkdev.h linux-4.1.39/include/linux/blkdev.h
- --- linux-4.1.39.orig/include/linux/blkdev.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/blkdev.h 2017-04-18 17:56:30.601396665 +0200
- @@ -101,6 +101,7 @@
- struct list_head queuelist;
- union {
- struct call_single_data csd;
- + struct work_struct work;
- unsigned long fifo_time;
- };
-
- @@ -482,7 +483,7 @@
- struct throtl_data *td;
- #endif
- struct rcu_head rcu_head;
- - wait_queue_head_t mq_freeze_wq;
- + struct swait_head mq_freeze_wq;
- struct percpu_ref mq_usage_counter;
- struct list_head all_q_node;
-
- diff -Nur linux-4.1.39.orig/include/linux/blk-mq.h linux-4.1.39/include/linux/blk-mq.h
- --- linux-4.1.39.orig/include/linux/blk-mq.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/blk-mq.h 2017-04-18 17:56:30.601396665 +0200
- @@ -202,6 +202,7 @@
-
- struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *, const int ctx_index);
- struct blk_mq_hw_ctx *blk_mq_alloc_single_hw_queue(struct blk_mq_tag_set *, unsigned int, int);
- +void __blk_mq_complete_request_remote_work(struct work_struct *work);
-
- int blk_mq_request_started(struct request *rq);
- void blk_mq_start_request(struct request *rq);
- diff -Nur linux-4.1.39.orig/include/linux/bottom_half.h linux-4.1.39/include/linux/bottom_half.h
- --- linux-4.1.39.orig/include/linux/bottom_half.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/bottom_half.h 2017-04-18 17:56:30.601396665 +0200
- @@ -4,6 +4,39 @@
- #include <linux/preempt.h>
- #include <linux/preempt_mask.h>
-
- +#ifdef CONFIG_PREEMPT_RT_FULL
- +
- +extern void __local_bh_disable(void);
- +extern void _local_bh_enable(void);
- +extern void __local_bh_enable(void);
- +
- +static inline void local_bh_disable(void)
- +{
- + __local_bh_disable();
- +}
- +
- +static inline void __local_bh_disable_ip(unsigned long ip, unsigned int cnt)
- +{
- + __local_bh_disable();
- +}
- +
- +static inline void local_bh_enable(void)
- +{
- + __local_bh_enable();
- +}
- +
- +static inline void __local_bh_enable_ip(unsigned long ip, unsigned int cnt)
- +{
- + __local_bh_enable();
- +}
- +
- +static inline void local_bh_enable_ip(unsigned long ip)
- +{
- + __local_bh_enable();
- +}
- +
- +#else
- +
- #ifdef CONFIG_TRACE_IRQFLAGS
- extern void __local_bh_disable_ip(unsigned long ip, unsigned int cnt);
- #else
- @@ -31,5 +64,6 @@
- {
- __local_bh_enable_ip(_THIS_IP_, SOFTIRQ_DISABLE_OFFSET);
- }
- +#endif
-
- #endif /* _LINUX_BH_H */
- diff -Nur linux-4.1.39.orig/include/linux/buffer_head.h linux-4.1.39/include/linux/buffer_head.h
- --- linux-4.1.39.orig/include/linux/buffer_head.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/buffer_head.h 2017-04-18 17:56:30.601396665 +0200
- @@ -75,8 +75,52 @@
- struct address_space *b_assoc_map; /* mapping this buffer is
- associated with */
- atomic_t b_count; /* users using this buffer_head */
- +#ifdef CONFIG_PREEMPT_RT_BASE
- + spinlock_t b_uptodate_lock;
- +#if defined(CONFIG_JBD) || defined(CONFIG_JBD_MODULE) || \
- + defined(CONFIG_JBD2) || defined(CONFIG_JBD2_MODULE)
- + spinlock_t b_state_lock;
- + spinlock_t b_journal_head_lock;
- +#endif
- +#endif
- };
-
- +static inline unsigned long bh_uptodate_lock_irqsave(struct buffer_head *bh)
- +{
- + unsigned long flags;
- +
- +#ifndef CONFIG_PREEMPT_RT_BASE
- + local_irq_save(flags);
- + bit_spin_lock(BH_Uptodate_Lock, &bh->b_state);
- +#else
- + spin_lock_irqsave(&bh->b_uptodate_lock, flags);
- +#endif
- + return flags;
- +}
- +
- +static inline void
- +bh_uptodate_unlock_irqrestore(struct buffer_head *bh, unsigned long flags)
- +{
- +#ifndef CONFIG_PREEMPT_RT_BASE
- + bit_spin_unlock(BH_Uptodate_Lock, &bh->b_state);
- + local_irq_restore(flags);
- +#else
- + spin_unlock_irqrestore(&bh->b_uptodate_lock, flags);
- +#endif
- +}
- +
- +static inline void buffer_head_init_locks(struct buffer_head *bh)
- +{
- +#ifdef CONFIG_PREEMPT_RT_BASE
- + spin_lock_init(&bh->b_uptodate_lock);
- +#if defined(CONFIG_JBD) || defined(CONFIG_JBD_MODULE) || \
- + defined(CONFIG_JBD2) || defined(CONFIG_JBD2_MODULE)
- + spin_lock_init(&bh->b_state_lock);
- + spin_lock_init(&bh->b_journal_head_lock);
- +#endif
- +#endif
- +}
- +
- /*
- * macro tricks to expand the set_buffer_foo(), clear_buffer_foo()
- * and buffer_foo() functions.
- diff -Nur linux-4.1.39.orig/include/linux/cgroup-defs.h linux-4.1.39/include/linux/cgroup-defs.h
- --- linux-4.1.39.orig/include/linux/cgroup-defs.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/cgroup-defs.h 2017-04-18 17:56:30.601396665 +0200
- @@ -124,6 +124,7 @@
- /* percpu_ref killing and RCU release */
- struct rcu_head rcu_head;
- struct work_struct destroy_work;
- + struct swork_event destroy_swork;
- };
-
- /*
- diff -Nur linux-4.1.39.orig/include/linux/cgroup.h linux-4.1.39/include/linux/cgroup.h
- --- linux-4.1.39.orig/include/linux/cgroup.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/cgroup.h 2017-04-18 17:56:30.605396820 +0200
- @@ -17,6 +17,8 @@
- #include <linux/fs.h>
- #include <linux/seq_file.h>
- #include <linux/kernfs.h>
- +#include <linux/wait.h>
- +#include <linux/work-simple.h>
-
- #include <linux/cgroup-defs.h>
-
- diff -Nur linux-4.1.39.orig/include/linux/completion.h linux-4.1.39/include/linux/completion.h
- --- linux-4.1.39.orig/include/linux/completion.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/completion.h 2017-04-18 17:56:30.605396820 +0200
- @@ -7,8 +7,7 @@
- * Atomic wait-for-completion handler data structures.
- * See kernel/sched/completion.c for details.
- */
- -
- -#include <linux/wait.h>
- +#include <linux/wait-simple.h>
-
- /*
- * struct completion - structure used to maintain state for a "completion"
- @@ -24,11 +23,11 @@
- */
- struct completion {
- unsigned int done;
- - wait_queue_head_t wait;
- + struct swait_head wait;
- };
-
- #define COMPLETION_INITIALIZER(work) \
- - { 0, __WAIT_QUEUE_HEAD_INITIALIZER((work).wait) }
- + { 0, SWAIT_HEAD_INITIALIZER((work).wait) }
-
- #define COMPLETION_INITIALIZER_ONSTACK(work) \
- ({ init_completion(&work); work; })
- @@ -73,7 +72,7 @@
- static inline void init_completion(struct completion *x)
- {
- x->done = 0;
- - init_waitqueue_head(&x->wait);
- + init_swait_head(&x->wait);
- }
-
- /**
- diff -Nur linux-4.1.39.orig/include/linux/cpu.h linux-4.1.39/include/linux/cpu.h
- --- linux-4.1.39.orig/include/linux/cpu.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/cpu.h 2017-04-18 17:56:30.605396820 +0200
- @@ -231,6 +231,8 @@
- extern void put_online_cpus(void);
- extern void cpu_hotplug_disable(void);
- extern void cpu_hotplug_enable(void);
- +extern void pin_current_cpu(void);
- +extern void unpin_current_cpu(void);
- #define hotcpu_notifier(fn, pri) cpu_notifier(fn, pri)
- #define __hotcpu_notifier(fn, pri) __cpu_notifier(fn, pri)
- #define register_hotcpu_notifier(nb) register_cpu_notifier(nb)
- @@ -249,6 +251,8 @@
- #define put_online_cpus() do { } while (0)
- #define cpu_hotplug_disable() do { } while (0)
- #define cpu_hotplug_enable() do { } while (0)
- +static inline void pin_current_cpu(void) { }
- +static inline void unpin_current_cpu(void) { }
- #define hotcpu_notifier(fn, pri) do { (void)(fn); } while (0)
- #define __hotcpu_notifier(fn, pri) do { (void)(fn); } while (0)
- /* These aren't inline functions due to a GCC bug. */
- diff -Nur linux-4.1.39.orig/include/linux/delay.h linux-4.1.39/include/linux/delay.h
- --- linux-4.1.39.orig/include/linux/delay.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/delay.h 2017-04-18 17:56:30.605396820 +0200
- @@ -52,4 +52,10 @@
- msleep(seconds * 1000);
- }
-
- +#ifdef CONFIG_PREEMPT_RT_FULL
- +extern void cpu_chill(void);
- +#else
- +# define cpu_chill() cpu_relax()
- +#endif
- +
- #endif /* defined(_LINUX_DELAY_H) */
- diff -Nur linux-4.1.39.orig/include/linux/ftrace_event.h linux-4.1.39/include/linux/ftrace_event.h
- --- linux-4.1.39.orig/include/linux/ftrace_event.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/ftrace_event.h 2017-04-18 17:56:30.605396820 +0200
- @@ -66,6 +66,9 @@
- unsigned char flags;
- unsigned char preempt_count;
- int pid;
- + unsigned short migrate_disable;
- + unsigned short padding;
- + unsigned char preempt_lazy_count;
- };
-
- #define FTRACE_MAX_EVENT \
- diff -Nur linux-4.1.39.orig/include/linux/ftrace.h linux-4.1.39/include/linux/ftrace.h
- --- linux-4.1.39.orig/include/linux/ftrace.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/ftrace.h 2017-04-18 17:56:30.605396820 +0200
- @@ -682,6 +682,18 @@
- #define CALLER_ADDR5 ((unsigned long)ftrace_return_address(5))
- #define CALLER_ADDR6 ((unsigned long)ftrace_return_address(6))
-
- +static inline unsigned long get_lock_parent_ip(void)
- +{
- + unsigned long addr = CALLER_ADDR0;
- +
- + if (!in_lock_functions(addr))
- + return addr;
- + addr = CALLER_ADDR1;
- + if (!in_lock_functions(addr))
- + return addr;
- + return CALLER_ADDR2;
- +}
- +
- #ifdef CONFIG_IRQSOFF_TRACER
- extern void time_hardirqs_on(unsigned long a0, unsigned long a1);
- extern void time_hardirqs_off(unsigned long a0, unsigned long a1);
- diff -Nur linux-4.1.39.orig/include/linux/highmem.h linux-4.1.39/include/linux/highmem.h
- --- linux-4.1.39.orig/include/linux/highmem.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/highmem.h 2017-04-18 17:56:30.605396820 +0200
- @@ -7,6 +7,7 @@
- #include <linux/mm.h>
- #include <linux/uaccess.h>
- #include <linux/hardirq.h>
- +#include <linux/sched.h>
-
- #include <asm/cacheflush.h>
-
- @@ -65,6 +66,7 @@
-
- static inline void *kmap_atomic(struct page *page)
- {
- + preempt_disable_nort();
- pagefault_disable();
- return page_address(page);
- }
- @@ -73,6 +75,7 @@
- static inline void __kunmap_atomic(void *addr)
- {
- pagefault_enable();
- + preempt_enable_nort();
- }
-
- #define kmap_atomic_pfn(pfn) kmap_atomic(pfn_to_page(pfn))
- @@ -85,32 +88,51 @@
-
- #if defined(CONFIG_HIGHMEM) || defined(CONFIG_X86_32)
-
- +#ifndef CONFIG_PREEMPT_RT_FULL
- DECLARE_PER_CPU(int, __kmap_atomic_idx);
- +#endif
-
- static inline int kmap_atomic_idx_push(void)
- {
- +#ifndef CONFIG_PREEMPT_RT_FULL
- int idx = __this_cpu_inc_return(__kmap_atomic_idx) - 1;
-
- -#ifdef CONFIG_DEBUG_HIGHMEM
- +# ifdef CONFIG_DEBUG_HIGHMEM
- WARN_ON_ONCE(in_irq() && !irqs_disabled());
- BUG_ON(idx >= KM_TYPE_NR);
- -#endif
- +# endif
- return idx;
- +#else
- + current->kmap_idx++;
- + BUG_ON(current->kmap_idx > KM_TYPE_NR);
- + return current->kmap_idx - 1;
- +#endif
- }
-
- static inline int kmap_atomic_idx(void)
- {
- +#ifndef CONFIG_PREEMPT_RT_FULL
- return __this_cpu_read(__kmap_atomic_idx) - 1;
- +#else
- + return current->kmap_idx - 1;
- +#endif
- }
-
- static inline void kmap_atomic_idx_pop(void)
- {
- -#ifdef CONFIG_DEBUG_HIGHMEM
- +#ifndef CONFIG_PREEMPT_RT_FULL
- +# ifdef CONFIG_DEBUG_HIGHMEM
- int idx = __this_cpu_dec_return(__kmap_atomic_idx);
-
- BUG_ON(idx < 0);
- -#else
- +# else
- __this_cpu_dec(__kmap_atomic_idx);
- +# endif
- +#else
- + current->kmap_idx--;
- +# ifdef CONFIG_DEBUG_HIGHMEM
- + BUG_ON(current->kmap_idx < 0);
- +# endif
- #endif
- }
-
- diff -Nur linux-4.1.39.orig/include/linux/hrtimer.h linux-4.1.39/include/linux/hrtimer.h
- --- linux-4.1.39.orig/include/linux/hrtimer.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/hrtimer.h 2017-04-18 17:56:30.605396820 +0200
- @@ -111,6 +111,11 @@
- enum hrtimer_restart (*function)(struct hrtimer *);
- struct hrtimer_clock_base *base;
- unsigned long state;
- + struct list_head cb_entry;
- + int irqsafe;
- +#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST
- + ktime_t praecox;
- +#endif
- #ifdef CONFIG_TIMER_STATS
- int start_pid;
- void *start_site;
- @@ -147,6 +152,7 @@
- int index;
- clockid_t clockid;
- struct timerqueue_head active;
- + struct list_head expired;
- ktime_t resolution;
- ktime_t (*get_time)(void);
- ktime_t softirq_time;
- @@ -194,6 +200,9 @@
- unsigned long nr_hangs;
- ktime_t max_hang_time;
- #endif
- +#ifdef CONFIG_PREEMPT_RT_BASE
- + wait_queue_head_t wait;
- +#endif
- struct hrtimer_clock_base clock_base[HRTIMER_MAX_CLOCK_BASES];
- };
-
- @@ -381,6 +390,13 @@
- return hrtimer_start_expires(timer, HRTIMER_MODE_ABS);
- }
-
- +/* Softirq preemption could deadlock timer removal */
- +#ifdef CONFIG_PREEMPT_RT_BASE
- + extern void hrtimer_wait_for_timer(const struct hrtimer *timer);
- +#else
- +# define hrtimer_wait_for_timer(timer) do { cpu_relax(); } while (0)
- +#endif
- +
- /* Query timers: */
- extern ktime_t hrtimer_get_remaining(const struct hrtimer *timer);
- extern int hrtimer_get_res(const clockid_t which_clock, struct timespec *tp);
- diff -Nur linux-4.1.39.orig/include/linux/idr.h linux-4.1.39/include/linux/idr.h
- --- linux-4.1.39.orig/include/linux/idr.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/idr.h 2017-04-18 17:56:30.605396820 +0200
- @@ -95,10 +95,14 @@
- * Each idr_preload() should be matched with an invocation of this
- * function. See idr_preload() for details.
- */
- +#ifdef CONFIG_PREEMPT_RT_FULL
- +void idr_preload_end(void);
- +#else
- static inline void idr_preload_end(void)
- {
- preempt_enable();
- }
- +#endif
-
- /**
- * idr_find - return pointer for given id
- diff -Nur linux-4.1.39.orig/include/linux/init_task.h linux-4.1.39/include/linux/init_task.h
- --- linux-4.1.39.orig/include/linux/init_task.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/init_task.h 2017-04-18 17:56:30.605396820 +0200
- @@ -147,9 +147,16 @@
- # define INIT_PERF_EVENTS(tsk)
- #endif
-
- +#ifdef CONFIG_PREEMPT_RT_BASE
- +# define INIT_TIMER_LIST .posix_timer_list = NULL,
- +#else
- +# define INIT_TIMER_LIST
- +#endif
- +
- #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
- # define INIT_VTIME(tsk) \
- - .vtime_seqlock = __SEQLOCK_UNLOCKED(tsk.vtime_seqlock), \
- + .vtime_lock = __RAW_SPIN_LOCK_UNLOCKED(tsk.vtime_lock), \
- + .vtime_seq = SEQCNT_ZERO(tsk.vtime_seq), \
- .vtime_snap = 0, \
- .vtime_snap_whence = VTIME_SYS,
- #else
- @@ -238,6 +245,7 @@
- .cpu_timers = INIT_CPU_TIMERS(tsk.cpu_timers), \
- .pi_lock = __RAW_SPIN_LOCK_UNLOCKED(tsk.pi_lock), \
- .timer_slack_ns = 50000, /* 50 usec default slack */ \
- + INIT_TIMER_LIST \
- .pids = { \
- [PIDTYPE_PID] = INIT_PID_LINK(PIDTYPE_PID), \
- [PIDTYPE_PGID] = INIT_PID_LINK(PIDTYPE_PGID), \
- diff -Nur linux-4.1.39.orig/include/linux/interrupt.h linux-4.1.39/include/linux/interrupt.h
- --- linux-4.1.39.orig/include/linux/interrupt.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/interrupt.h 2017-04-18 17:56:30.605396820 +0200
- @@ -61,6 +61,7 @@
- * interrupt handler after suspending interrupts. For system
- * wakeup devices users need to implement wakeup detection in
- * their interrupt handlers.
- + * IRQF_NO_SOFTIRQ_CALL - Do not process softirqs in the irq thread context (RT)
- */
- #define IRQF_SHARED 0x00000080
- #define IRQF_PROBE_SHARED 0x00000100
- @@ -74,6 +75,7 @@
- #define IRQF_NO_THREAD 0x00010000
- #define IRQF_EARLY_RESUME 0x00020000
- #define IRQF_COND_SUSPEND 0x00040000
- +#define IRQF_NO_SOFTIRQ_CALL 0x00080000
-
- #define IRQF_TIMER (__IRQF_TIMER | IRQF_NO_SUSPEND | IRQF_NO_THREAD)
-
- @@ -102,6 +104,7 @@
- * @flags: flags (see IRQF_* above)
- * @thread_fn: interrupt handler function for threaded interrupts
- * @thread: thread pointer for threaded interrupts
- + * @secondary: pointer to secondary irqaction (force threading)
- * @thread_flags: flags related to @thread
- * @thread_mask: bitmask for keeping track of @thread activity
- * @dir: pointer to the proc/irq/NN/name entry
- @@ -113,6 +116,7 @@
- struct irqaction *next;
- irq_handler_t thread_fn;
- struct task_struct *thread;
- + struct irqaction *secondary;
- unsigned int irq;
- unsigned int flags;
- unsigned long thread_flags;
- @@ -184,7 +188,7 @@
- #ifdef CONFIG_LOCKDEP
- # define local_irq_enable_in_hardirq() do { } while (0)
- #else
- -# define local_irq_enable_in_hardirq() local_irq_enable()
- +# define local_irq_enable_in_hardirq() local_irq_enable_nort()
- #endif
-
- extern void disable_irq_nosync(unsigned int irq);
- @@ -215,6 +219,7 @@
- unsigned int irq;
- struct kref kref;
- struct work_struct work;
- + struct list_head list;
- void (*notify)(struct irq_affinity_notify *, const cpumask_t *mask);
- void (*release)(struct kref *ref);
- };
- @@ -377,9 +382,13 @@
- bool state);
-
- #ifdef CONFIG_IRQ_FORCED_THREADING
- +# ifndef CONFIG_PREEMPT_RT_BASE
- extern bool force_irqthreads;
- +# else
- +# define force_irqthreads (true)
- +# endif
- #else
- -#define force_irqthreads (0)
- +#define force_irqthreads (false)
- #endif
-
- #ifndef __ARCH_SET_SOFTIRQ_PENDING
- @@ -435,9 +444,10 @@
- void (*action)(struct softirq_action *);
- };
-
- +#ifndef CONFIG_PREEMPT_RT_FULL
- asmlinkage void do_softirq(void);
- asmlinkage void __do_softirq(void);
- -
- +static inline void thread_do_softirq(void) { do_softirq(); }
- #ifdef __ARCH_HAS_DO_SOFTIRQ
- void do_softirq_own_stack(void);
- #else
- @@ -446,13 +456,25 @@
- __do_softirq();
- }
- #endif
- +#else
- +extern void thread_do_softirq(void);
- +#endif
-
- extern void open_softirq(int nr, void (*action)(struct softirq_action *));
- extern void softirq_init(void);
- extern void __raise_softirq_irqoff(unsigned int nr);
- +#ifdef CONFIG_PREEMPT_RT_FULL
- +extern void __raise_softirq_irqoff_ksoft(unsigned int nr);
- +#else
- +static inline void __raise_softirq_irqoff_ksoft(unsigned int nr)
- +{
- + __raise_softirq_irqoff(nr);
- +}
- +#endif
-
- extern void raise_softirq_irqoff(unsigned int nr);
- extern void raise_softirq(unsigned int nr);
- +extern void softirq_check_pending_idle(void);
-
- DECLARE_PER_CPU(struct task_struct *, ksoftirqd);
-
- @@ -474,8 +496,9 @@
- to be executed on some cpu at least once after this.
- * If the tasklet is already scheduled, but its execution is still not
- started, it will be executed only once.
- - * If this tasklet is already running on another CPU (or schedule is called
- - from tasklet itself), it is rescheduled for later.
- + * If this tasklet is already running on another CPU, it is rescheduled
- + for later.
- + * Schedule must not be called from the tasklet itself (a lockup occurs)
- * Tasklet is strictly serialized wrt itself, but not
- wrt another tasklets. If client needs some intertask synchronization,
- he makes it with spinlocks.
- @@ -500,27 +523,36 @@
- enum
- {
- TASKLET_STATE_SCHED, /* Tasklet is scheduled for execution */
- - TASKLET_STATE_RUN /* Tasklet is running (SMP only) */
- + TASKLET_STATE_RUN, /* Tasklet is running (SMP only) */
- + TASKLET_STATE_PENDING /* Tasklet is pending */
- };
-
- -#ifdef CONFIG_SMP
- +#define TASKLET_STATEF_SCHED (1 << TASKLET_STATE_SCHED)
- +#define TASKLET_STATEF_RUN (1 << TASKLET_STATE_RUN)
- +#define TASKLET_STATEF_PENDING (1 << TASKLET_STATE_PENDING)
- +
- +#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_RT_FULL)
- static inline int tasklet_trylock(struct tasklet_struct *t)
- {
- return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state);
- }
-
- +static inline int tasklet_tryunlock(struct tasklet_struct *t)
- +{
- + return cmpxchg(&t->state, TASKLET_STATEF_RUN, 0) == TASKLET_STATEF_RUN;
- +}
- +
- static inline void tasklet_unlock(struct tasklet_struct *t)
- {
- smp_mb__before_atomic();
- clear_bit(TASKLET_STATE_RUN, &(t)->state);
- }
-
- -static inline void tasklet_unlock_wait(struct tasklet_struct *t)
- -{
- - while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); }
- -}
- +extern void tasklet_unlock_wait(struct tasklet_struct *t);
- +
- #else
- #define tasklet_trylock(t) 1
- +#define tasklet_tryunlock(t) 1
- #define tasklet_unlock_wait(t) do { } while (0)
- #define tasklet_unlock(t) do { } while (0)
- #endif
- @@ -569,12 +601,7 @@
- smp_mb();
- }
-
- -static inline void tasklet_enable(struct tasklet_struct *t)
- -{
- - smp_mb__before_atomic();
- - atomic_dec(&t->count);
- -}
- -
- +extern void tasklet_enable(struct tasklet_struct *t);
- extern void tasklet_kill(struct tasklet_struct *t);
- extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu);
- extern void tasklet_init(struct tasklet_struct *t,
- @@ -605,6 +632,12 @@
- tasklet_kill(&ttimer->tasklet);
- }
-
- +#ifdef CONFIG_PREEMPT_RT_FULL
- +extern void softirq_early_init(void);
- +#else
- +static inline void softirq_early_init(void) { }
- +#endif
- +
- /*
- * Autoprobing for irqs:
- *
- diff -Nur linux-4.1.39.orig/include/linux/io-mapping.h linux-4.1.39/include/linux/io-mapping.h
- --- linux-4.1.39.orig/include/linux/io-mapping.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/io-mapping.h 2017-04-18 17:56:30.605396820 +0200
- @@ -141,6 +141,7 @@
- io_mapping_map_atomic_wc(struct io_mapping *mapping,
- unsigned long offset)
- {
- + preempt_disable();
- pagefault_disable();
- return ((char __force __iomem *) mapping) + offset;
- }
- @@ -149,6 +150,7 @@
- io_mapping_unmap_atomic(void __iomem *vaddr)
- {
- pagefault_enable();
- + preempt_enable();
- }
-
- /* Non-atomic map/unmap */
- diff -Nur linux-4.1.39.orig/include/linux/irqdesc.h linux-4.1.39/include/linux/irqdesc.h
- --- linux-4.1.39.orig/include/linux/irqdesc.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/irqdesc.h 2017-04-18 17:56:30.605396820 +0200
- @@ -63,6 +63,7 @@
- unsigned int irqs_unhandled;
- atomic_t threads_handled;
- int threads_handled_last;
- + u64 random_ip;
- raw_spinlock_t lock;
- struct cpumask *percpu_enabled;
- #ifdef CONFIG_SMP
- diff -Nur linux-4.1.39.orig/include/linux/irqflags.h linux-4.1.39/include/linux/irqflags.h
- --- linux-4.1.39.orig/include/linux/irqflags.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/irqflags.h 2017-04-18 17:56:30.605396820 +0200
- @@ -25,8 +25,6 @@
- # define trace_softirqs_enabled(p) ((p)->softirqs_enabled)
- # define trace_hardirq_enter() do { current->hardirq_context++; } while (0)
- # define trace_hardirq_exit() do { current->hardirq_context--; } while (0)
- -# define lockdep_softirq_enter() do { current->softirq_context++; } while (0)
- -# define lockdep_softirq_exit() do { current->softirq_context--; } while (0)
- # define INIT_TRACE_IRQFLAGS .softirqs_enabled = 1,
- #else
- # define trace_hardirqs_on() do { } while (0)
- @@ -39,9 +37,15 @@
- # define trace_softirqs_enabled(p) 0
- # define trace_hardirq_enter() do { } while (0)
- # define trace_hardirq_exit() do { } while (0)
- +# define INIT_TRACE_IRQFLAGS
- +#endif
- +
- +#if defined(CONFIG_TRACE_IRQFLAGS) && !defined(CONFIG_PREEMPT_RT_FULL)
- +# define lockdep_softirq_enter() do { current->softirq_context++; } while (0)
- +# define lockdep_softirq_exit() do { current->softirq_context--; } while (0)
- +#else
- # define lockdep_softirq_enter() do { } while (0)
- # define lockdep_softirq_exit() do { } while (0)
- -# define INIT_TRACE_IRQFLAGS
- #endif
-
- #if defined(CONFIG_IRQSOFF_TRACER) || \
- @@ -148,4 +152,23 @@
-
- #define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags)
-
- +/*
- + * local_irq* variants depending on RT/!RT
- + */
- +#ifdef CONFIG_PREEMPT_RT_FULL
- +# define local_irq_disable_nort() do { } while (0)
- +# define local_irq_enable_nort() do { } while (0)
- +# define local_irq_save_nort(flags) local_save_flags(flags)
- +# define local_irq_restore_nort(flags) (void)(flags)
- +# define local_irq_disable_rt() local_irq_disable()
- +# define local_irq_enable_rt() local_irq_enable()
- +#else
- +# define local_irq_disable_nort() local_irq_disable()
- +# define local_irq_enable_nort() local_irq_enable()
- +# define local_irq_save_nort(flags) local_irq_save(flags)
- +# define local_irq_restore_nort(flags) local_irq_restore(flags)
- +# define local_irq_disable_rt() do { } while (0)
- +# define local_irq_enable_rt() do { } while (0)
- +#endif
- +
- #endif
- diff -Nur linux-4.1.39.orig/include/linux/irq.h linux-4.1.39/include/linux/irq.h
- --- linux-4.1.39.orig/include/linux/irq.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/irq.h 2017-04-18 17:56:30.605396820 +0200
- @@ -72,6 +72,7 @@
- * IRQ_IS_POLLED - Always polled by another interrupt. Exclude
- * it from the spurious interrupt detection
- * mechanism and from core side polling.
- + * IRQ_NO_SOFTIRQ_CALL - No softirq processing in the irq thread context (RT)
- */
- enum {
- IRQ_TYPE_NONE = 0x00000000,
- @@ -97,13 +98,14 @@
- IRQ_NOTHREAD = (1 << 16),
- IRQ_PER_CPU_DEVID = (1 << 17),
- IRQ_IS_POLLED = (1 << 18),
- + IRQ_NO_SOFTIRQ_CALL = (1 << 19),
- };
-
- #define IRQF_MODIFY_MASK \
- (IRQ_TYPE_SENSE_MASK | IRQ_NOPROBE | IRQ_NOREQUEST | \
- IRQ_NOAUTOEN | IRQ_MOVE_PCNTXT | IRQ_LEVEL | IRQ_NO_BALANCING | \
- IRQ_PER_CPU | IRQ_NESTED_THREAD | IRQ_NOTHREAD | IRQ_PER_CPU_DEVID | \
- - IRQ_IS_POLLED)
- + IRQ_IS_POLLED | IRQ_NO_SOFTIRQ_CALL)
-
- #define IRQ_NO_BALANCING_MASK (IRQ_PER_CPU | IRQ_NO_BALANCING)
-
- diff -Nur linux-4.1.39.orig/include/linux/irq_work.h linux-4.1.39/include/linux/irq_work.h
- --- linux-4.1.39.orig/include/linux/irq_work.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/irq_work.h 2017-04-18 17:56:30.605396820 +0200
- @@ -16,6 +16,7 @@
- #define IRQ_WORK_BUSY 2UL
- #define IRQ_WORK_FLAGS 3UL
- #define IRQ_WORK_LAZY 4UL /* Doesn't want IPI, wait for tick */
- +#define IRQ_WORK_HARD_IRQ 8UL /* Run hard IRQ context, even on RT */
-
- struct irq_work {
- unsigned long flags;
- @@ -51,4 +52,10 @@
- static inline void irq_work_run(void) { }
- #endif
-
- +#if defined(CONFIG_IRQ_WORK) && defined(CONFIG_PREEMPT_RT_FULL)
- +void irq_work_tick_soft(void);
- +#else
- +static inline void irq_work_tick_soft(void) { }
- +#endif
- +
- #endif /* _LINUX_IRQ_WORK_H */
- diff -Nur linux-4.1.39.orig/include/linux/jbd_common.h linux-4.1.39/include/linux/jbd_common.h
- --- linux-4.1.39.orig/include/linux/jbd_common.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/jbd_common.h 2017-04-18 17:56:30.605396820 +0200
- @@ -15,32 +15,56 @@
-
- static inline void jbd_lock_bh_state(struct buffer_head *bh)
- {
- +#ifndef CONFIG_PREEMPT_RT_BASE
- bit_spin_lock(BH_State, &bh->b_state);
- +#else
- + spin_lock(&bh->b_state_lock);
- +#endif
- }
-
- static inline int jbd_trylock_bh_state(struct buffer_head *bh)
- {
- +#ifndef CONFIG_PREEMPT_RT_BASE
- return bit_spin_trylock(BH_State, &bh->b_state);
- +#else
- + return spin_trylock(&bh->b_state_lock);
- +#endif
- }
-
- static inline int jbd_is_locked_bh_state(struct buffer_head *bh)
- {
- +#ifndef CONFIG_PREEMPT_RT_BASE
- return bit_spin_is_locked(BH_State, &bh->b_state);
- +#else
- + return spin_is_locked(&bh->b_state_lock);
- +#endif
- }
-
- static inline void jbd_unlock_bh_state(struct buffer_head *bh)
- {
- +#ifndef CONFIG_PREEMPT_RT_BASE
- bit_spin_unlock(BH_State, &bh->b_state);
- +#else
- + spin_unlock(&bh->b_state_lock);
- +#endif
- }
-
- static inline void jbd_lock_bh_journal_head(struct buffer_head *bh)
- {
- +#ifndef CONFIG_PREEMPT_RT_BASE
- bit_spin_lock(BH_JournalHead, &bh->b_state);
- +#else
- + spin_lock(&bh->b_journal_head_lock);
- +#endif
- }
-
- static inline void jbd_unlock_bh_journal_head(struct buffer_head *bh)
- {
- +#ifndef CONFIG_PREEMPT_RT_BASE
- bit_spin_unlock(BH_JournalHead, &bh->b_state);
- +#else
- + spin_unlock(&bh->b_journal_head_lock);
- +#endif
- }
-
- #endif
- diff -Nur linux-4.1.39.orig/include/linux/kdb.h linux-4.1.39/include/linux/kdb.h
- --- linux-4.1.39.orig/include/linux/kdb.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/kdb.h 2017-04-18 17:56:30.605396820 +0200
- @@ -167,6 +167,7 @@
- extern __printf(1, 2) int kdb_printf(const char *, ...);
- typedef __printf(1, 2) int (*kdb_printf_t)(const char *, ...);
-
- +#define in_kdb_printk() (kdb_trap_printk)
- extern void kdb_init(int level);
-
- /* Access to kdb specific polling devices */
- @@ -201,6 +202,7 @@
- extern int kdb_unregister(char *);
- #else /* ! CONFIG_KGDB_KDB */
- static inline __printf(1, 2) int kdb_printf(const char *fmt, ...) { return 0; }
- +#define in_kdb_printk() (0)
- static inline void kdb_init(int level) {}
- static inline int kdb_register(char *cmd, kdb_func_t func, char *usage,
- char *help, short minlen) { return 0; }
- diff -Nur linux-4.1.39.orig/include/linux/kernel.h linux-4.1.39/include/linux/kernel.h
- --- linux-4.1.39.orig/include/linux/kernel.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/kernel.h 2017-04-18 17:56:30.605396820 +0200
- @@ -188,6 +188,9 @@
- */
- # define might_sleep() \
- do { __might_sleep(__FILE__, __LINE__, 0); might_resched(); } while (0)
- +
- +# define might_sleep_no_state_check() \
- + do { ___might_sleep(__FILE__, __LINE__, 0); might_resched(); } while (0)
- # define sched_annotate_sleep() (current->task_state_change = 0)
- #else
- static inline void ___might_sleep(const char *file, int line,
- @@ -195,6 +198,7 @@
- static inline void __might_sleep(const char *file, int line,
- int preempt_offset) { }
- # define might_sleep() do { might_resched(); } while (0)
- +# define might_sleep_no_state_check() do { might_resched(); } while (0)
- # define sched_annotate_sleep() do { } while (0)
- #endif
-
- @@ -244,7 +248,8 @@
-
- #if defined(CONFIG_MMU) && \
- (defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_DEBUG_ATOMIC_SLEEP))
- -void might_fault(void);
- +#define might_fault() __might_fault(__FILE__, __LINE__)
- +void __might_fault(const char *file, int line);
- #else
- static inline void might_fault(void) { }
- #endif
- @@ -466,6 +471,7 @@
- SYSTEM_HALT,
- SYSTEM_POWER_OFF,
- SYSTEM_RESTART,
- + SYSTEM_SUSPEND,
- } system_state;
-
- #define TAINT_PROPRIETARY_MODULE 0
- diff -Nur linux-4.1.39.orig/include/linux/kvm_host.h linux-4.1.39/include/linux/kvm_host.h
- --- linux-4.1.39.orig/include/linux/kvm_host.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/kvm_host.h 2017-04-18 17:56:30.605396820 +0200
- @@ -230,7 +230,7 @@
-
- int fpu_active;
- int guest_fpu_loaded, guest_xcr0_loaded;
- - wait_queue_head_t wq;
- + struct swait_head wq;
- struct pid *pid;
- int sigset_active;
- sigset_t sigset;
- @@ -701,7 +701,7 @@
- }
- #endif
-
- -static inline wait_queue_head_t *kvm_arch_vcpu_wq(struct kvm_vcpu *vcpu)
- +static inline struct swait_head *kvm_arch_vcpu_wq(struct kvm_vcpu *vcpu)
- {
- #ifdef __KVM_HAVE_ARCH_WQP
- return vcpu->arch.wqp;
- diff -Nur linux-4.1.39.orig/include/linux/lglock.h linux-4.1.39/include/linux/lglock.h
- --- linux-4.1.39.orig/include/linux/lglock.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/lglock.h 2017-04-18 17:56:30.605396820 +0200
- @@ -34,22 +34,39 @@
- #endif
-
- struct lglock {
- +#ifndef CONFIG_PREEMPT_RT_FULL
- arch_spinlock_t __percpu *lock;
- +#else
- + struct rt_mutex __percpu *lock;
- +#endif
- #ifdef CONFIG_DEBUG_LOCK_ALLOC
- struct lock_class_key lock_key;
- struct lockdep_map lock_dep_map;
- #endif
- };
-
- -#define DEFINE_LGLOCK(name) \
- +#ifndef CONFIG_PREEMPT_RT_FULL
- +# define DEFINE_LGLOCK(name) \
- static DEFINE_PER_CPU(arch_spinlock_t, name ## _lock) \
- = __ARCH_SPIN_LOCK_UNLOCKED; \
- struct lglock name = { .lock = &name ## _lock }
-
- -#define DEFINE_STATIC_LGLOCK(name) \
- +# define DEFINE_STATIC_LGLOCK(name) \
- static DEFINE_PER_CPU(arch_spinlock_t, name ## _lock) \
- = __ARCH_SPIN_LOCK_UNLOCKED; \
- static struct lglock name = { .lock = &name ## _lock }
- +#else
- +
- +# define DEFINE_LGLOCK(name) \
- + static DEFINE_PER_CPU(struct rt_mutex, name ## _lock) \
- + = __RT_MUTEX_INITIALIZER( name ## _lock); \
- + struct lglock name = { .lock = &name ## _lock }
- +
- +# define DEFINE_STATIC_LGLOCK(name) \
- + static DEFINE_PER_CPU(struct rt_mutex, name ## _lock) \
- + = __RT_MUTEX_INITIALIZER( name ## _lock); \
- + static struct lglock name = { .lock = &name ## _lock }
- +#endif
-
- void lg_lock_init(struct lglock *lg, char *name);
- void lg_local_lock(struct lglock *lg);
- @@ -59,6 +76,12 @@
- void lg_global_lock(struct lglock *lg);
- void lg_global_unlock(struct lglock *lg);
-
- +#ifndef CONFIG_PREEMPT_RT_FULL
- +#define lg_global_trylock_relax(name) lg_global_lock(name)
- +#else
- +void lg_global_trylock_relax(struct lglock *lg);
- +#endif
- +
- #else
- /* When !CONFIG_SMP, map lglock to spinlock */
- #define lglock spinlock
- diff -Nur linux-4.1.39.orig/include/linux/list_bl.h linux-4.1.39/include/linux/list_bl.h
- --- linux-4.1.39.orig/include/linux/list_bl.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/list_bl.h 2017-04-18 17:56:30.605396820 +0200
- @@ -2,6 +2,7 @@
- #define _LINUX_LIST_BL_H
-
- #include <linux/list.h>
- +#include <linux/spinlock.h>
- #include <linux/bit_spinlock.h>
-
- /*
- @@ -32,13 +33,24 @@
-
- struct hlist_bl_head {
- struct hlist_bl_node *first;
- +#ifdef CONFIG_PREEMPT_RT_BASE
- + raw_spinlock_t lock;
- +#endif
- };
-
- struct hlist_bl_node {
- struct hlist_bl_node *next, **pprev;
- };
- -#define INIT_HLIST_BL_HEAD(ptr) \
- - ((ptr)->first = NULL)
- +
- +#ifdef CONFIG_PREEMPT_RT_BASE
- +#define INIT_HLIST_BL_HEAD(h) \
- +do { \
- + (h)->first = NULL; \
- + raw_spin_lock_init(&(h)->lock); \
- +} while (0)
- +#else
- +#define INIT_HLIST_BL_HEAD(h) (h)->first = NULL
- +#endif
-
- static inline void INIT_HLIST_BL_NODE(struct hlist_bl_node *h)
- {
- @@ -117,12 +129,26 @@
-
- static inline void hlist_bl_lock(struct hlist_bl_head *b)
- {
- +#ifndef CONFIG_PREEMPT_RT_BASE
- bit_spin_lock(0, (unsigned long *)b);
- +#else
- + raw_spin_lock(&b->lock);
- +#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
- + __set_bit(0, (unsigned long *)b);
- +#endif
- +#endif
- }
-
- static inline void hlist_bl_unlock(struct hlist_bl_head *b)
- {
- +#ifndef CONFIG_PREEMPT_RT_BASE
- __bit_spin_unlock(0, (unsigned long *)b);
- +#else
- +#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
- + __clear_bit(0, (unsigned long *)b);
- +#endif
- + raw_spin_unlock(&b->lock);
- +#endif
- }
-
- static inline bool hlist_bl_is_locked(struct hlist_bl_head *b)
- diff -Nur linux-4.1.39.orig/include/linux/locallock.h linux-4.1.39/include/linux/locallock.h
- --- linux-4.1.39.orig/include/linux/locallock.h 1970-01-01 01:00:00.000000000 +0100
- +++ linux-4.1.39/include/linux/locallock.h 2017-04-18 17:56:30.605396820 +0200
- @@ -0,0 +1,276 @@
- +#ifndef _LINUX_LOCALLOCK_H
- +#define _LINUX_LOCALLOCK_H
- +
- +#include <linux/percpu.h>
- +#include <linux/spinlock.h>
- +
- +#ifdef CONFIG_PREEMPT_RT_BASE
- +
- +#ifdef CONFIG_DEBUG_SPINLOCK
- +# define LL_WARN(cond) WARN_ON(cond)
- +#else
- +# define LL_WARN(cond) do { } while (0)
- +#endif
- +
- +/*
- + * per cpu lock based substitute for local_irq_*()
- + */
- +struct local_irq_lock {
- + spinlock_t lock;
- + struct task_struct *owner;
- + int nestcnt;
- + unsigned long flags;
- +};
- +
- +#define DEFINE_LOCAL_IRQ_LOCK(lvar) \
- + DEFINE_PER_CPU(struct local_irq_lock, lvar) = { \
- + .lock = __SPIN_LOCK_UNLOCKED((lvar).lock) }
- +
- +#define DECLARE_LOCAL_IRQ_LOCK(lvar) \
- + DECLARE_PER_CPU(struct local_irq_lock, lvar)
- +
- +#define local_irq_lock_init(lvar) \
- + do { \
- + int __cpu; \
- + for_each_possible_cpu(__cpu) \
- + spin_lock_init(&per_cpu(lvar, __cpu).lock); \
- + } while (0)
- +
- +/*
- + * spin_lock|trylock|unlock_local flavour that does not migrate disable
- + * used for __local_lock|trylock|unlock where get_local_var/put_local_var
- + * already takes care of the migrate_disable/enable
- + * for CONFIG_PREEMPT_BASE map to the normal spin_* calls.
- + */
- +#ifdef CONFIG_PREEMPT_RT_FULL
- +# define spin_lock_local(lock) rt_spin_lock(lock)
- +# define spin_trylock_local(lock) rt_spin_trylock(lock)
- +# define spin_unlock_local(lock) rt_spin_unlock(lock)
- +#else
- +# define spin_lock_local(lock) spin_lock(lock)
- +# define spin_trylock_local(lock) spin_trylock(lock)
- +# define spin_unlock_local(lock) spin_unlock(lock)
- +#endif
- +
- +static inline void __local_lock(struct local_irq_lock *lv)
- +{
- + if (lv->owner != current) {
- + spin_lock_local(&lv->lock);
- + LL_WARN(lv->owner);
- + LL_WARN(lv->nestcnt);
- + lv->owner = current;
- + }
- + lv->nestcnt++;
- +}
- +
- +#define local_lock(lvar) \
- + do { __local_lock(&get_local_var(lvar)); } while (0)
- +
- +#define local_lock_on(lvar, cpu) \
- + do { __local_lock(&per_cpu(lvar, cpu)); } while (0)
- +
- +static inline int __local_trylock(struct local_irq_lock *lv)
- +{
- + if (lv->owner != current && spin_trylock_local(&lv->lock)) {
- + LL_WARN(lv->owner);
- + LL_WARN(lv->nestcnt);
- + lv->owner = current;
- + lv->nestcnt = 1;
- + return 1;
- + }
- + return 0;
- +}
- +
- +#define local_trylock(lvar) \
- + ({ \
- + int __locked; \
- + __locked = __local_trylock(&get_local_var(lvar)); \
- + if (!__locked) \
- + put_local_var(lvar); \
- + __locked; \
- + })
- +
- +static inline void __local_unlock(struct local_irq_lock *lv)
- +{
- + LL_WARN(lv->nestcnt == 0);
- + LL_WARN(lv->owner != current);
- + if (--lv->nestcnt)
- + return;
- +
- + lv->owner = NULL;
- + spin_unlock_local(&lv->lock);
- +}
- +
- +#define local_unlock(lvar) \
- + do { \
- + __local_unlock(this_cpu_ptr(&lvar)); \
- + put_local_var(lvar); \
- + } while (0)
- +
- +#define local_unlock_on(lvar, cpu) \
- + do { __local_unlock(&per_cpu(lvar, cpu)); } while (0)
- +
- +static inline void __local_lock_irq(struct local_irq_lock *lv)
- +{
- + spin_lock_irqsave(&lv->lock, lv->flags);
- + LL_WARN(lv->owner);
- + LL_WARN(lv->nestcnt);
- + lv->owner = current;
- + lv->nestcnt = 1;
- +}
- +
- +#define local_lock_irq(lvar) \
- + do { __local_lock_irq(&get_local_var(lvar)); } while (0)
- +
- +#define local_lock_irq_on(lvar, cpu) \
- + do { __local_lock_irq(&per_cpu(lvar, cpu)); } while (0)
- +
- +static inline void __local_unlock_irq(struct local_irq_lock *lv)
- +{
- + LL_WARN(!lv->nestcnt);
- + LL_WARN(lv->owner != current);
- + lv->owner = NULL;
- + lv->nestcnt = 0;
- + spin_unlock_irq(&lv->lock);
- +}
- +
- +#define local_unlock_irq(lvar) \
- + do { \
- + __local_unlock_irq(this_cpu_ptr(&lvar)); \
- + put_local_var(lvar); \
- + } while (0)
- +
- +#define local_unlock_irq_on(lvar, cpu) \
- + do { \
- + __local_unlock_irq(&per_cpu(lvar, cpu)); \
- + } while (0)
- +
- +static inline int __local_lock_irqsave(struct local_irq_lock *lv)
- +{
- + if (lv->owner != current) {
- + __local_lock_irq(lv);
- + return 0;
- + } else {
- + lv->nestcnt++;
- + return 1;
- + }
- +}
- +
- +#define local_lock_irqsave(lvar, _flags) \
- + do { \
- + if (__local_lock_irqsave(&get_local_var(lvar))) \
- + put_local_var(lvar); \
- + _flags = __this_cpu_read(lvar.flags); \
- + } while (0)
- +
- +#define local_lock_irqsave_on(lvar, _flags, cpu) \
- + do { \
- + __local_lock_irqsave(&per_cpu(lvar, cpu)); \
- + _flags = per_cpu(lvar, cpu).flags; \
- + } while (0)
- +
- +static inline int __local_unlock_irqrestore(struct local_irq_lock *lv,
- + unsigned long flags)
- +{
- + LL_WARN(!lv->nestcnt);
- + LL_WARN(lv->owner != current);
- + if (--lv->nestcnt)
- + return 0;
- +
- + lv->owner = NULL;
- + spin_unlock_irqrestore(&lv->lock, lv->flags);
- + return 1;
- +}
- +
- +#define local_unlock_irqrestore(lvar, flags) \
- + do { \
- + if (__local_unlock_irqrestore(this_cpu_ptr(&lvar), flags)) \
- + put_local_var(lvar); \
- + } while (0)
- +
- +#define local_unlock_irqrestore_on(lvar, flags, cpu) \
- + do { \
- + __local_unlock_irqrestore(&per_cpu(lvar, cpu), flags); \
- + } while (0)
- +
- +#define local_spin_trylock_irq(lvar, lock) \
- + ({ \
- + int __locked; \
- + local_lock_irq(lvar); \
- + __locked = spin_trylock(lock); \
- + if (!__locked) \
- + local_unlock_irq(lvar); \
- + __locked; \
- + })
- +
- +#define local_spin_lock_irq(lvar, lock) \
- + do { \
- + local_lock_irq(lvar); \
- + spin_lock(lock); \
- + } while (0)
- +
- +#define local_spin_unlock_irq(lvar, lock) \
- + do { \
- + spin_unlock(lock); \
- + local_unlock_irq(lvar); \
- + } while (0)
- +
- +#define local_spin_lock_irqsave(lvar, lock, flags) \
- + do { \
- + local_lock_irqsave(lvar, flags); \
- + spin_lock(lock); \
- + } while (0)
- +
- +#define local_spin_unlock_irqrestore(lvar, lock, flags) \
- + do { \
- + spin_unlock(lock); \
- + local_unlock_irqrestore(lvar, flags); \
- + } while (0)
- +
- +#define get_locked_var(lvar, var) \
- + (*({ \
- + local_lock(lvar); \
- + this_cpu_ptr(&var); \
- + }))
- +
- +#define put_locked_var(lvar, var) local_unlock(lvar);
- +
- +#define local_lock_cpu(lvar) \
- + ({ \
- + local_lock(lvar); \
- + smp_processor_id(); \
- + })
- +
- +#define local_unlock_cpu(lvar) local_unlock(lvar)
- +
- +#else /* PREEMPT_RT_BASE */
- +
- +#define DEFINE_LOCAL_IRQ_LOCK(lvar) __typeof__(const int) lvar
- +#define DECLARE_LOCAL_IRQ_LOCK(lvar) extern __typeof__(const int) lvar
- +
- +static inline void local_irq_lock_init(int lvar) { }
- +
- +#define local_lock(lvar) preempt_disable()
- +#define local_unlock(lvar) preempt_enable()
- +#define local_lock_irq(lvar) local_irq_disable()
- +#define local_unlock_irq(lvar) local_irq_enable()
- +#define local_lock_irqsave(lvar, flags) local_irq_save(flags)
- +#define local_unlock_irqrestore(lvar, flags) local_irq_restore(flags)
- +
- +#define local_spin_trylock_irq(lvar, lock) spin_trylock_irq(lock)
- +#define local_spin_lock_irq(lvar, lock) spin_lock_irq(lock)
- +#define local_spin_unlock_irq(lvar, lock) spin_unlock_irq(lock)
- +#define local_spin_lock_irqsave(lvar, lock, flags) \
- + spin_lock_irqsave(lock, flags)
- +#define local_spin_unlock_irqrestore(lvar, lock, flags) \
- + spin_unlock_irqrestore(lock, flags)
- +
- +#define get_locked_var(lvar, var) get_cpu_var(var)
- +#define put_locked_var(lvar, var) put_cpu_var(var)
- +
- +#define local_lock_cpu(lvar) get_cpu()
- +#define local_unlock_cpu(lvar) put_cpu()
- +
- +#endif
- +
- +#endif
- diff -Nur linux-4.1.39.orig/include/linux/mm_types.h linux-4.1.39/include/linux/mm_types.h
- --- linux-4.1.39.orig/include/linux/mm_types.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/mm_types.h 2017-04-18 17:56:30.605396820 +0200
- @@ -11,6 +11,7 @@
- #include <linux/completion.h>
- #include <linux/cpumask.h>
- #include <linux/uprobes.h>
- +#include <linux/rcupdate.h>
- #include <linux/page-flags-layout.h>
- #include <asm/page.h>
- #include <asm/mmu.h>
- @@ -453,6 +454,9 @@
- bool tlb_flush_pending;
- #endif
- struct uprobes_state uprobes_state;
- +#ifdef CONFIG_PREEMPT_RT_BASE
- + struct rcu_head delayed_drop;
- +#endif
- #ifdef CONFIG_X86_INTEL_MPX
- /* address of the bounds directory */
- void __user *bd_addr;
- diff -Nur linux-4.1.39.orig/include/linux/module.h linux-4.1.39/include/linux/module.h
- --- linux-4.1.39.orig/include/linux/module.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/module.h 2017-04-18 17:56:30.605396820 +0200
- @@ -386,6 +386,7 @@
- struct module *__module_text_address(unsigned long addr);
- struct module *__module_address(unsigned long addr);
- bool is_module_address(unsigned long addr);
- +bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr);
- bool is_module_percpu_address(unsigned long addr);
- bool is_module_text_address(unsigned long addr);
-
- @@ -537,6 +538,11 @@
- {
- return false;
- }
- +
- +static inline bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr)
- +{
- + return false;
- +}
-
- static inline bool is_module_text_address(unsigned long addr)
- {
- diff -Nur linux-4.1.39.orig/include/linux/mutex.h linux-4.1.39/include/linux/mutex.h
- --- linux-4.1.39.orig/include/linux/mutex.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/mutex.h 2017-04-18 17:56:30.605396820 +0200
- @@ -19,6 +19,17 @@
- #include <asm/processor.h>
- #include <linux/osq_lock.h>
-
- +#ifdef CONFIG_DEBUG_LOCK_ALLOC
- +# define __DEP_MAP_MUTEX_INITIALIZER(lockname) \
- + , .dep_map = { .name = #lockname }
- +#else
- +# define __DEP_MAP_MUTEX_INITIALIZER(lockname)
- +#endif
- +
- +#ifdef CONFIG_PREEMPT_RT_FULL
- +# include <linux/mutex_rt.h>
- +#else
- +
- /*
- * Simple, straightforward mutexes with strict semantics:
- *
- @@ -99,13 +110,6 @@
- static inline void mutex_destroy(struct mutex *lock) {}
- #endif
-
- -#ifdef CONFIG_DEBUG_LOCK_ALLOC
- -# define __DEP_MAP_MUTEX_INITIALIZER(lockname) \
- - , .dep_map = { .name = #lockname }
- -#else
- -# define __DEP_MAP_MUTEX_INITIALIZER(lockname)
- -#endif
- -
- #define __MUTEX_INITIALIZER(lockname) \
- { .count = ATOMIC_INIT(1) \
- , .wait_lock = __SPIN_LOCK_UNLOCKED(lockname.wait_lock) \
- @@ -173,6 +177,8 @@
- extern int mutex_trylock(struct mutex *lock);
- extern void mutex_unlock(struct mutex *lock);
-
- +#endif /* !PREEMPT_RT_FULL */
- +
- extern int atomic_dec_and_mutex_lock(atomic_t *cnt, struct mutex *lock);
-
- #endif /* __LINUX_MUTEX_H */
- diff -Nur linux-4.1.39.orig/include/linux/mutex_rt.h linux-4.1.39/include/linux/mutex_rt.h
- --- linux-4.1.39.orig/include/linux/mutex_rt.h 1970-01-01 01:00:00.000000000 +0100
- +++ linux-4.1.39/include/linux/mutex_rt.h 2017-04-18 17:56:30.605396820 +0200
- @@ -0,0 +1,89 @@
- +#ifndef __LINUX_MUTEX_RT_H
- +#define __LINUX_MUTEX_RT_H
- +
- +#ifndef __LINUX_MUTEX_H
- +#error "Please include mutex.h"
- +#endif
- +
- +#include <linux/rtmutex.h>
- +
- +/* FIXME: Just for __lockfunc */
- +#include <linux/spinlock.h>
- +
- +struct mutex {
- + struct rt_mutex lock;
- +#ifdef CONFIG_DEBUG_LOCK_ALLOC
- + struct lockdep_map dep_map;
- +#endif
- +};
- +
- +#define __MUTEX_INITIALIZER(mutexname) \
- + { \
- + .lock = __RT_MUTEX_INITIALIZER(mutexname.lock) \
- + __DEP_MAP_MUTEX_INITIALIZER(mutexname) \
- + }
- +
- +#define DEFINE_MUTEX(mutexname) \
- + struct mutex mutexname = __MUTEX_INITIALIZER(mutexname)
- +
- +extern void __mutex_do_init(struct mutex *lock, const char *name, struct lock_class_key *key);
- +extern void __lockfunc _mutex_lock(struct mutex *lock);
- +extern int __lockfunc _mutex_lock_interruptible(struct mutex *lock);
- +extern int __lockfunc _mutex_lock_killable(struct mutex *lock);
- +extern void __lockfunc _mutex_lock_nested(struct mutex *lock, int subclass);
- +extern void __lockfunc _mutex_lock_nest_lock(struct mutex *lock, struct lockdep_map *nest_lock);
- +extern int __lockfunc _mutex_lock_interruptible_nested(struct mutex *lock, int subclass);
- +extern int __lockfunc _mutex_lock_killable_nested(struct mutex *lock, int subclass);
- +extern int __lockfunc _mutex_trylock(struct mutex *lock);
- +extern void __lockfunc _mutex_unlock(struct mutex *lock);
- +
- +#define mutex_is_locked(l) rt_mutex_is_locked(&(l)->lock)
- +#define mutex_lock(l) _mutex_lock(l)
- +#define mutex_lock_interruptible(l) _mutex_lock_interruptible(l)
- +#define mutex_lock_killable(l) _mutex_lock_killable(l)
- +#define mutex_trylock(l) _mutex_trylock(l)
- +#define mutex_unlock(l) _mutex_unlock(l)
- +
- +#ifdef CONFIG_DEBUG_MUTEXES
- +#define mutex_destroy(l) rt_mutex_destroy(&(l)->lock)
- +#else
- +static inline void mutex_destroy(struct mutex *lock) {}
- +#endif
- +
- +#ifdef CONFIG_DEBUG_LOCK_ALLOC
- +# define mutex_lock_nested(l, s) _mutex_lock_nested(l, s)
- +# define mutex_lock_interruptible_nested(l, s) \
- + _mutex_lock_interruptible_nested(l, s)
- +# define mutex_lock_killable_nested(l, s) \
- + _mutex_lock_killable_nested(l, s)
- +
- +# define mutex_lock_nest_lock(lock, nest_lock) \
- +do { \
- + typecheck(struct lockdep_map *, &(nest_lock)->dep_map); \
- + _mutex_lock_nest_lock(lock, &(nest_lock)->dep_map); \
- +} while (0)
- +
- +#else
- +# define mutex_lock_nested(l, s) _mutex_lock(l)
- +# define mutex_lock_interruptible_nested(l, s) \
- + _mutex_lock_interruptible(l)
- +# define mutex_lock_killable_nested(l, s) \
- + _mutex_lock_killable(l)
- +# define mutex_lock_nest_lock(lock, nest_lock) mutex_lock(lock)
- +#endif
- +
- +# define mutex_init(mutex) \
- +do { \
- + static struct lock_class_key __key; \
- + \
- + rt_mutex_init(&(mutex)->lock); \
- + __mutex_do_init((mutex), #mutex, &__key); \
- +} while (0)
- +
- +# define __mutex_init(mutex, name, key) \
- +do { \
- + rt_mutex_init(&(mutex)->lock); \
- + __mutex_do_init((mutex), name, key); \
- +} while (0)
- +
- +#endif
- diff -Nur linux-4.1.39.orig/include/linux/netdevice.h linux-4.1.39/include/linux/netdevice.h
- --- linux-4.1.39.orig/include/linux/netdevice.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/netdevice.h 2017-04-18 17:56:30.609396976 +0200
- @@ -390,7 +390,19 @@
- typedef rx_handler_result_t rx_handler_func_t(struct sk_buff **pskb);
-
- void __napi_schedule(struct napi_struct *n);
- +
- +/*
- + * When PREEMPT_RT_FULL is defined, all device interrupt handlers
- + * run as threads, and they can also be preempted (without PREEMPT_RT
- + * interrupt threads can not be preempted). Which means that calling
- + * __napi_schedule_irqoff() from an interrupt handler can be preempted
- + * and can corrupt the napi->poll_list.
- + */
- +#ifdef CONFIG_PREEMPT_RT_FULL
- +#define __napi_schedule_irqoff(n) __napi_schedule(n)
- +#else
- void __napi_schedule_irqoff(struct napi_struct *n);
- +#endif
-
- static inline bool napi_disable_pending(struct napi_struct *n)
- {
- @@ -2215,11 +2227,20 @@
- void synchronize_net(void);
- int init_dummy_netdev(struct net_device *dev);
-
- +#ifdef CONFIG_PREEMPT_RT_FULL
- +static inline int dev_recursion_level(void)
- +{
- + return current->xmit_recursion;
- +}
- +
- +#else
- +
- DECLARE_PER_CPU(int, xmit_recursion);
- static inline int dev_recursion_level(void)
- {
- return this_cpu_read(xmit_recursion);
- }
- +#endif
-
- struct net_device *dev_get_by_index(struct net *net, int ifindex);
- struct net_device *__dev_get_by_index(struct net *net, int ifindex);
- @@ -2510,6 +2531,7 @@
- unsigned int dropped;
- struct sk_buff_head input_pkt_queue;
- struct napi_struct backlog;
- + struct sk_buff_head tofree_queue;
-
- };
-
- diff -Nur linux-4.1.39.orig/include/linux/netfilter/x_tables.h linux-4.1.39/include/linux/netfilter/x_tables.h
- --- linux-4.1.39.orig/include/linux/netfilter/x_tables.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/netfilter/x_tables.h 2017-04-18 17:56:30.609396976 +0200
- @@ -3,6 +3,7 @@
-
-
- #include <linux/netdevice.h>
- +#include <linux/locallock.h>
- #include <uapi/linux/netfilter/x_tables.h>
-
- /**
- @@ -293,6 +294,8 @@
- */
- DECLARE_PER_CPU(seqcount_t, xt_recseq);
-
- +DECLARE_LOCAL_IRQ_LOCK(xt_write_lock);
- +
- /**
- * xt_write_recseq_begin - start of a write section
- *
- @@ -307,6 +310,9 @@
- {
- unsigned int addend;
-
- + /* RT protection */
- + local_lock(xt_write_lock);
- +
- /*
- * Low order bit of sequence is set if we already
- * called xt_write_recseq_begin().
- @@ -337,6 +343,7 @@
- /* this is kind of a write_seqcount_end(), but addend is 0 or 1 */
- smp_wmb();
- __this_cpu_add(xt_recseq.sequence, addend);
- + local_unlock(xt_write_lock);
- }
-
- /*
- diff -Nur linux-4.1.39.orig/include/linux/notifier.h linux-4.1.39/include/linux/notifier.h
- --- linux-4.1.39.orig/include/linux/notifier.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/notifier.h 2017-04-18 17:56:30.609396976 +0200
- @@ -6,7 +6,7 @@
- *
- * Alan Cox <Alan.Cox@linux.org>
- */
- -
- +
- #ifndef _LINUX_NOTIFIER_H
- #define _LINUX_NOTIFIER_H
- #include <linux/errno.h>
- @@ -42,9 +42,7 @@
- * in srcu_notifier_call_chain(): no cache bounces and no memory barriers.
- * As compensation, srcu_notifier_chain_unregister() is rather expensive.
- * SRCU notifier chains should be used when the chain will be called very
- - * often but notifier_blocks will seldom be removed. Also, SRCU notifier
- - * chains are slightly more difficult to use because they require special
- - * runtime initialization.
- + * often but notifier_blocks will seldom be removed.
- */
-
- typedef int (*notifier_fn_t)(struct notifier_block *nb,
- @@ -88,7 +86,7 @@
- (name)->head = NULL; \
- } while (0)
-
- -/* srcu_notifier_heads must be initialized and cleaned up dynamically */
- +/* srcu_notifier_heads must be cleaned up dynamically */
- extern void srcu_init_notifier_head(struct srcu_notifier_head *nh);
- #define srcu_cleanup_notifier_head(name) \
- cleanup_srcu_struct(&(name)->srcu);
- @@ -101,7 +99,13 @@
- .head = NULL }
- #define RAW_NOTIFIER_INIT(name) { \
- .head = NULL }
- -/* srcu_notifier_heads cannot be initialized statically */
- +
- +#define SRCU_NOTIFIER_INIT(name, pcpu) \
- + { \
- + .mutex = __MUTEX_INITIALIZER(name.mutex), \
- + .head = NULL, \
- + .srcu = __SRCU_STRUCT_INIT(name.srcu, pcpu), \
- + }
-
- #define ATOMIC_NOTIFIER_HEAD(name) \
- struct atomic_notifier_head name = \
- @@ -113,6 +117,18 @@
- struct raw_notifier_head name = \
- RAW_NOTIFIER_INIT(name)
-
- +#define _SRCU_NOTIFIER_HEAD(name, mod) \
- + static DEFINE_PER_CPU(struct srcu_struct_array, \
- + name##_head_srcu_array); \
- + mod struct srcu_notifier_head name = \
- + SRCU_NOTIFIER_INIT(name, name##_head_srcu_array)
- +
- +#define SRCU_NOTIFIER_HEAD(name) \
- + _SRCU_NOTIFIER_HEAD(name, )
- +
- +#define SRCU_NOTIFIER_HEAD_STATIC(name) \
- + _SRCU_NOTIFIER_HEAD(name, static)
- +
- #ifdef __KERNEL__
-
- extern int atomic_notifier_chain_register(struct atomic_notifier_head *nh,
- @@ -182,12 +198,12 @@
-
- /*
- * Declared notifiers so far. I can imagine quite a few more chains
- - * over time (eg laptop power reset chains, reboot chain (to clean
- + * over time (eg laptop power reset chains, reboot chain (to clean
- * device units up), device [un]mount chain, module load/unload chain,
- - * low memory chain, screenblank chain (for plug in modular screenblankers)
- + * low memory chain, screenblank chain (for plug in modular screenblankers)
- * VC switch chains (for loadable kernel svgalib VC switch helpers) etc...
- */
- -
- +
- /* CPU notfiers are defined in include/linux/cpu.h. */
-
- /* netdevice notifiers are defined in include/linux/netdevice.h */
- diff -Nur linux-4.1.39.orig/include/linux/percpu.h linux-4.1.39/include/linux/percpu.h
- --- linux-4.1.39.orig/include/linux/percpu.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/percpu.h 2017-04-18 17:56:30.609396976 +0200
- @@ -24,6 +24,35 @@
- PERCPU_MODULE_RESERVE)
- #endif
-
- +#ifdef CONFIG_PREEMPT_RT_FULL
- +
- +#define get_local_var(var) (*({ \
- + migrate_disable(); \
- + this_cpu_ptr(&var); }))
- +
- +#define put_local_var(var) do { \
- + (void)&(var); \
- + migrate_enable(); \
- +} while (0)
- +
- +# define get_local_ptr(var) ({ \
- + migrate_disable(); \
- + this_cpu_ptr(var); })
- +
- +# define put_local_ptr(var) do { \
- + (void)(var); \
- + migrate_enable(); \
- +} while (0)
- +
- +#else
- +
- +#define get_local_var(var) get_cpu_var(var)
- +#define put_local_var(var) put_cpu_var(var)
- +#define get_local_ptr(var) get_cpu_ptr(var)
- +#define put_local_ptr(var) put_cpu_ptr(var)
- +
- +#endif
- +
- /* minimum unit size, also is the maximum supported allocation size */
- #define PCPU_MIN_UNIT_SIZE PFN_ALIGN(32 << 10)
-
- @@ -116,6 +145,7 @@
- #endif
-
- extern void __percpu *__alloc_reserved_percpu(size_t size, size_t align);
- +extern bool __is_kernel_percpu_address(unsigned long addr, unsigned long *can_addr);
- extern bool is_kernel_percpu_address(unsigned long addr);
-
- #if !defined(CONFIG_SMP) || !defined(CONFIG_HAVE_SETUP_PER_CPU_AREA)
- diff -Nur linux-4.1.39.orig/include/linux/pid.h linux-4.1.39/include/linux/pid.h
- --- linux-4.1.39.orig/include/linux/pid.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/pid.h 2017-04-18 17:56:30.609396976 +0200
- @@ -2,6 +2,7 @@
- #define _LINUX_PID_H
-
- #include <linux/rcupdate.h>
- +#include <linux/atomic.h>
-
- enum pid_type
- {
- diff -Nur linux-4.1.39.orig/include/linux/platform_data/gpio-omap.h linux-4.1.39/include/linux/platform_data/gpio-omap.h
- --- linux-4.1.39.orig/include/linux/platform_data/gpio-omap.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/platform_data/gpio-omap.h 2017-04-18 17:56:30.609396976 +0200
- @@ -198,7 +198,6 @@
- int bank_width; /* GPIO bank width */
- int bank_stride; /* Only needed for omap1 MPUIO */
- bool dbck_flag; /* dbck required or not - True for OMAP3&4 */
- - bool loses_context; /* whether the bank would ever lose context */
- bool is_mpuio; /* whether the bank is of type MPUIO */
- u32 non_wakeup_gpios;
-
- @@ -208,9 +207,17 @@
- int (*get_context_loss_count)(struct device *dev);
- };
-
- +#if IS_BUILTIN(CONFIG_GPIO_OMAP)
- extern void omap2_gpio_prepare_for_idle(int off_mode);
- extern void omap2_gpio_resume_after_idle(void);
- -extern void omap_set_gpio_debounce(int gpio, int enable);
- -extern void omap_set_gpio_debounce_time(int gpio, int enable);
- +#else
- +static inline void omap2_gpio_prepare_for_idle(int off_mode)
- +{
- +}
- +
- +static inline void omap2_gpio_resume_after_idle(void)
- +{
- +}
- +#endif
-
- #endif
- diff -Nur linux-4.1.39.orig/include/linux/preempt.h linux-4.1.39/include/linux/preempt.h
- --- linux-4.1.39.orig/include/linux/preempt.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/preempt.h 2017-04-18 17:56:30.609396976 +0200
- @@ -34,6 +34,20 @@
- #define preempt_count_inc() preempt_count_add(1)
- #define preempt_count_dec() preempt_count_sub(1)
-
- +#ifdef CONFIG_PREEMPT_LAZY
- +#define add_preempt_lazy_count(val) do { preempt_lazy_count() += (val); } while (0)
- +#define sub_preempt_lazy_count(val) do { preempt_lazy_count() -= (val); } while (0)
- +#define inc_preempt_lazy_count() add_preempt_lazy_count(1)
- +#define dec_preempt_lazy_count() sub_preempt_lazy_count(1)
- +#define preempt_lazy_count() (current_thread_info()->preempt_lazy_count)
- +#else
- +#define add_preempt_lazy_count(val) do { } while (0)
- +#define sub_preempt_lazy_count(val) do { } while (0)
- +#define inc_preempt_lazy_count() do { } while (0)
- +#define dec_preempt_lazy_count() do { } while (0)
- +#define preempt_lazy_count() (0)
- +#endif
- +
- #ifdef CONFIG_PREEMPT_COUNT
-
- #define preempt_disable() \
- @@ -42,13 +56,25 @@
- barrier(); \
- } while (0)
-
- +#define preempt_lazy_disable() \
- +do { \
- + inc_preempt_lazy_count(); \
- + barrier(); \
- +} while (0)
- +
- #define sched_preempt_enable_no_resched() \
- do { \
- barrier(); \
- preempt_count_dec(); \
- } while (0)
-
- -#define preempt_enable_no_resched() sched_preempt_enable_no_resched()
- +#ifdef CONFIG_PREEMPT_RT_BASE
- +# define preempt_enable_no_resched() sched_preempt_enable_no_resched()
- +# define preempt_check_resched_rt() preempt_check_resched()
- +#else
- +# define preempt_enable_no_resched() preempt_enable()
- +# define preempt_check_resched_rt() barrier();
- +#endif
-
- #ifdef CONFIG_PREEMPT
- #define preempt_enable() \
- @@ -64,6 +90,13 @@
- __preempt_schedule(); \
- } while (0)
-
- +#define preempt_lazy_enable() \
- +do { \
- + dec_preempt_lazy_count(); \
- + barrier(); \
- + preempt_check_resched(); \
- +} while (0)
- +
- #else
- #define preempt_enable() \
- do { \
- @@ -122,6 +155,7 @@
- #define preempt_disable_notrace() barrier()
- #define preempt_enable_no_resched_notrace() barrier()
- #define preempt_enable_notrace() barrier()
- +#define preempt_check_resched_rt() barrier()
-
- #endif /* CONFIG_PREEMPT_COUNT */
-
- @@ -141,10 +175,31 @@
- } while (0)
- #define preempt_fold_need_resched() \
- do { \
- - if (tif_need_resched()) \
- + if (tif_need_resched_now()) \
- set_preempt_need_resched(); \
- } while (0)
-
- +#ifdef CONFIG_PREEMPT_RT_FULL
- +# define preempt_disable_rt() preempt_disable()
- +# define preempt_enable_rt() preempt_enable()
- +# define preempt_disable_nort() barrier()
- +# define preempt_enable_nort() barrier()
- +# ifdef CONFIG_SMP
- + extern void migrate_disable(void);
- + extern void migrate_enable(void);
- +# else /* CONFIG_SMP */
- +# define migrate_disable() barrier()
- +# define migrate_enable() barrier()
- +# endif /* CONFIG_SMP */
- +#else
- +# define preempt_disable_rt() barrier()
- +# define preempt_enable_rt() barrier()
- +# define preempt_disable_nort() preempt_disable()
- +# define preempt_enable_nort() preempt_enable()
- +# define migrate_disable() preempt_disable()
- +# define migrate_enable() preempt_enable()
- +#endif
- +
- #ifdef CONFIG_PREEMPT_NOTIFIERS
-
- struct preempt_notifier;
- diff -Nur linux-4.1.39.orig/include/linux/preempt_mask.h linux-4.1.39/include/linux/preempt_mask.h
- --- linux-4.1.39.orig/include/linux/preempt_mask.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/preempt_mask.h 2017-04-18 17:56:30.609396976 +0200
- @@ -44,16 +44,26 @@
- #define HARDIRQ_OFFSET (1UL << HARDIRQ_SHIFT)
- #define NMI_OFFSET (1UL << NMI_SHIFT)
-
- -#define SOFTIRQ_DISABLE_OFFSET (2 * SOFTIRQ_OFFSET)
- +#ifndef CONFIG_PREEMPT_RT_FULL
- +# define SOFTIRQ_DISABLE_OFFSET (2 * SOFTIRQ_OFFSET)
- +#else
- +# define SOFTIRQ_DISABLE_OFFSET (0)
- +#endif
-
- #define PREEMPT_ACTIVE_BITS 1
- #define PREEMPT_ACTIVE_SHIFT (NMI_SHIFT + NMI_BITS)
- #define PREEMPT_ACTIVE (__IRQ_MASK(PREEMPT_ACTIVE_BITS) << PREEMPT_ACTIVE_SHIFT)
-
- #define hardirq_count() (preempt_count() & HARDIRQ_MASK)
- -#define softirq_count() (preempt_count() & SOFTIRQ_MASK)
- #define irq_count() (preempt_count() & (HARDIRQ_MASK | SOFTIRQ_MASK \
- | NMI_MASK))
- +#ifndef CONFIG_PREEMPT_RT_FULL
- +# define softirq_count() (preempt_count() & SOFTIRQ_MASK)
- +# define in_serving_softirq() (softirq_count() & SOFTIRQ_OFFSET)
- +#else
- +# define softirq_count() (0UL)
- +extern int in_serving_softirq(void);
- +#endif
-
- /*
- * Are we doing bottom half or hardware interrupt processing?
- @@ -64,7 +74,6 @@
- #define in_irq() (hardirq_count())
- #define in_softirq() (softirq_count())
- #define in_interrupt() (irq_count())
- -#define in_serving_softirq() (softirq_count() & SOFTIRQ_OFFSET)
-
- /*
- * Are we in NMI context?
- @@ -83,7 +92,11 @@
- /*
- * The preempt_count offset after spin_lock()
- */
- +#if !defined(CONFIG_PREEMPT_RT_FULL)
- #define PREEMPT_LOCK_OFFSET PREEMPT_DISABLE_OFFSET
- +#else
- +#define PREEMPT_LOCK_OFFSET 0
- +#endif
-
- /*
- * The preempt_count offset needed for things like:
- diff -Nur linux-4.1.39.orig/include/linux/printk.h linux-4.1.39/include/linux/printk.h
- --- linux-4.1.39.orig/include/linux/printk.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/printk.h 2017-04-18 17:56:30.609396976 +0200
- @@ -115,9 +115,11 @@
- #ifdef CONFIG_EARLY_PRINTK
- extern asmlinkage __printf(1, 2)
- void early_printk(const char *fmt, ...);
- +extern void printk_kill(void);
- #else
- static inline __printf(1, 2) __cold
- void early_printk(const char *s, ...) { }
- +static inline void printk_kill(void) { }
- #endif
-
- typedef int(*printk_func_t)(const char *fmt, va_list args);
- diff -Nur linux-4.1.39.orig/include/linux/radix-tree.h linux-4.1.39/include/linux/radix-tree.h
- --- linux-4.1.39.orig/include/linux/radix-tree.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/radix-tree.h 2017-04-18 17:56:30.609396976 +0200
- @@ -279,6 +279,8 @@
- unsigned long first_index, unsigned int max_items);
- int radix_tree_preload(gfp_t gfp_mask);
- int radix_tree_maybe_preload(gfp_t gfp_mask);
- +void radix_tree_preload_end(void);
- +
- void radix_tree_init(void);
- void *radix_tree_tag_set(struct radix_tree_root *root,
- unsigned long index, unsigned int tag);
- @@ -301,11 +303,6 @@
- int radix_tree_tagged(struct radix_tree_root *root, unsigned int tag);
- unsigned long radix_tree_locate_item(struct radix_tree_root *root, void *item);
-
- -static inline void radix_tree_preload_end(void)
- -{
- - preempt_enable();
- -}
- -
- /**
- * struct radix_tree_iter - radix tree iterator state
- *
- diff -Nur linux-4.1.39.orig/include/linux/random.h linux-4.1.39/include/linux/random.h
- --- linux-4.1.39.orig/include/linux/random.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/random.h 2017-04-18 17:56:30.609396976 +0200
- @@ -11,7 +11,7 @@
- extern void add_device_randomness(const void *, unsigned int);
- extern void add_input_randomness(unsigned int type, unsigned int code,
- unsigned int value);
- -extern void add_interrupt_randomness(int irq, int irq_flags);
- +extern void add_interrupt_randomness(int irq, int irq_flags, __u64 ip);
-
- extern void get_random_bytes(void *buf, int nbytes);
- extern void get_random_bytes_arch(void *buf, int nbytes);
- diff -Nur linux-4.1.39.orig/include/linux/rcupdate.h linux-4.1.39/include/linux/rcupdate.h
- --- linux-4.1.39.orig/include/linux/rcupdate.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/rcupdate.h 2017-04-18 17:56:30.609396976 +0200
- @@ -167,6 +167,9 @@
-
- #endif /* #else #ifdef CONFIG_PREEMPT_RCU */
-
- +#ifdef CONFIG_PREEMPT_RT_FULL
- +#define call_rcu_bh call_rcu
- +#else
- /**
- * call_rcu_bh() - Queue an RCU for invocation after a quicker grace period.
- * @head: structure to be used for queueing the RCU updates.
- @@ -190,6 +193,7 @@
- */
- void call_rcu_bh(struct rcu_head *head,
- void (*func)(struct rcu_head *head));
- +#endif
-
- /**
- * call_rcu_sched() - Queue an RCU for invocation after sched grace period.
- @@ -260,6 +264,11 @@
- * types of kernel builds, the rcu_read_lock() nesting depth is unknowable.
- */
- #define rcu_preempt_depth() (current->rcu_read_lock_nesting)
- +#ifndef CONFIG_PREEMPT_RT_FULL
- +#define sched_rcu_preempt_depth() rcu_preempt_depth()
- +#else
- +static inline int sched_rcu_preempt_depth(void) { return 0; }
- +#endif
-
- #else /* #ifdef CONFIG_PREEMPT_RCU */
-
- @@ -283,6 +292,8 @@
- return 0;
- }
-
- +#define sched_rcu_preempt_depth() rcu_preempt_depth()
- +
- #endif /* #else #ifdef CONFIG_PREEMPT_RCU */
-
- /* Internal to kernel */
- @@ -463,7 +474,14 @@
- int debug_lockdep_rcu_enabled(void);
-
- int rcu_read_lock_held(void);
- +#ifdef CONFIG_PREEMPT_RT_FULL
- +static inline int rcu_read_lock_bh_held(void)
- +{
- + return rcu_read_lock_held();
- +}
- +#else
- int rcu_read_lock_bh_held(void);
- +#endif
-
- /**
- * rcu_read_lock_sched_held() - might we be in RCU-sched read-side critical section?
- @@ -990,10 +1008,14 @@
- static inline void rcu_read_lock_bh(void)
- {
- local_bh_disable();
- +#ifdef CONFIG_PREEMPT_RT_FULL
- + rcu_read_lock();
- +#else
- __acquire(RCU_BH);
- rcu_lock_acquire(&rcu_bh_lock_map);
- rcu_lockdep_assert(rcu_is_watching(),
- "rcu_read_lock_bh() used illegally while idle");
- +#endif
- }
-
- /*
- @@ -1003,10 +1025,14 @@
- */
- static inline void rcu_read_unlock_bh(void)
- {
- +#ifdef CONFIG_PREEMPT_RT_FULL
- + rcu_read_unlock();
- +#else
- rcu_lockdep_assert(rcu_is_watching(),
- "rcu_read_unlock_bh() used illegally while idle");
- rcu_lock_release(&rcu_bh_lock_map);
- __release(RCU_BH);
- +#endif
- local_bh_enable();
- }
-
- diff -Nur linux-4.1.39.orig/include/linux/rcutree.h linux-4.1.39/include/linux/rcutree.h
- --- linux-4.1.39.orig/include/linux/rcutree.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/rcutree.h 2017-04-18 17:56:30.609396976 +0200
- @@ -46,7 +46,11 @@
- rcu_note_context_switch();
- }
-
- +#ifdef CONFIG_PREEMPT_RT_FULL
- +# define synchronize_rcu_bh synchronize_rcu
- +#else
- void synchronize_rcu_bh(void);
- +#endif
- void synchronize_sched_expedited(void);
- void synchronize_rcu_expedited(void);
-
- @@ -74,7 +78,11 @@
- }
-
- void rcu_barrier(void);
- +#ifdef CONFIG_PREEMPT_RT_FULL
- +# define rcu_barrier_bh rcu_barrier
- +#else
- void rcu_barrier_bh(void);
- +#endif
- void rcu_barrier_sched(void);
- unsigned long get_state_synchronize_rcu(void);
- void cond_synchronize_rcu(unsigned long oldstate);
- @@ -85,12 +93,10 @@
- unsigned long rcu_batches_started_bh(void);
- unsigned long rcu_batches_started_sched(void);
- unsigned long rcu_batches_completed(void);
- -unsigned long rcu_batches_completed_bh(void);
- unsigned long rcu_batches_completed_sched(void);
- void show_rcu_gp_kthreads(void);
-
- void rcu_force_quiescent_state(void);
- -void rcu_bh_force_quiescent_state(void);
- void rcu_sched_force_quiescent_state(void);
-
- void exit_rcu(void);
- @@ -100,6 +106,14 @@
-
- bool rcu_is_watching(void);
-
- +#ifndef CONFIG_PREEMPT_RT_FULL
- +void rcu_bh_force_quiescent_state(void);
- +unsigned long rcu_batches_completed_bh(void);
- +#else
- +# define rcu_bh_force_quiescent_state rcu_force_quiescent_state
- +# define rcu_batches_completed_bh rcu_batches_completed
- +#endif
- +
- void rcu_all_qs(void);
-
- #endif /* __LINUX_RCUTREE_H */
- diff -Nur linux-4.1.39.orig/include/linux/rtmutex.h linux-4.1.39/include/linux/rtmutex.h
- --- linux-4.1.39.orig/include/linux/rtmutex.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/rtmutex.h 2017-04-18 17:56:30.609396976 +0200
- @@ -14,10 +14,14 @@
-
- #include <linux/linkage.h>
- #include <linux/rbtree.h>
- -#include <linux/spinlock_types.h>
- +#include <linux/spinlock_types_raw.h>
-
- extern int max_lock_depth; /* for sysctl */
-
- +#ifdef CONFIG_DEBUG_MUTEXES
- +#include <linux/debug_locks.h>
- +#endif
- +
- /**
- * The rt_mutex structure
- *
- @@ -31,8 +35,8 @@
- struct rb_root waiters;
- struct rb_node *waiters_leftmost;
- struct task_struct *owner;
- -#ifdef CONFIG_DEBUG_RT_MUTEXES
- int save_state;
- +#ifdef CONFIG_DEBUG_RT_MUTEXES
- const char *name, *file;
- int line;
- void *magic;
- @@ -55,22 +59,33 @@
- # define rt_mutex_debug_check_no_locks_held(task) do { } while (0)
- #endif
-
- +# define rt_mutex_init(mutex) \
- + do { \
- + raw_spin_lock_init(&(mutex)->wait_lock); \
- + __rt_mutex_init(mutex, #mutex); \
- + } while (0)
- +
- #ifdef CONFIG_DEBUG_RT_MUTEXES
- # define __DEBUG_RT_MUTEX_INITIALIZER(mutexname) \
- , .name = #mutexname, .file = __FILE__, .line = __LINE__
- -# define rt_mutex_init(mutex) __rt_mutex_init(mutex, __func__)
- extern void rt_mutex_debug_task_free(struct task_struct *tsk);
- #else
- # define __DEBUG_RT_MUTEX_INITIALIZER(mutexname)
- -# define rt_mutex_init(mutex) __rt_mutex_init(mutex, NULL)
- # define rt_mutex_debug_task_free(t) do { } while (0)
- #endif
-
- -#define __RT_MUTEX_INITIALIZER(mutexname) \
- - { .wait_lock = __RAW_SPIN_LOCK_UNLOCKED(mutexname.wait_lock) \
- +#define __RT_MUTEX_INITIALIZER_PLAIN(mutexname) \
- + .wait_lock = __RAW_SPIN_LOCK_UNLOCKED(mutexname.wait_lock) \
- , .waiters = RB_ROOT \
- , .owner = NULL \
- - __DEBUG_RT_MUTEX_INITIALIZER(mutexname)}
- + __DEBUG_RT_MUTEX_INITIALIZER(mutexname)
- +
- +#define __RT_MUTEX_INITIALIZER(mutexname) \
- + { __RT_MUTEX_INITIALIZER_PLAIN(mutexname) }
- +
- +#define __RT_MUTEX_INITIALIZER_SAVE_STATE(mutexname) \
- + { __RT_MUTEX_INITIALIZER_PLAIN(mutexname) \
- + , .save_state = 1 }
-
- #define DEFINE_RT_MUTEX(mutexname) \
- struct rt_mutex mutexname = __RT_MUTEX_INITIALIZER(mutexname)
- @@ -91,6 +106,7 @@
-
- extern void rt_mutex_lock(struct rt_mutex *lock);
- extern int rt_mutex_lock_interruptible(struct rt_mutex *lock);
- +extern int rt_mutex_lock_killable(struct rt_mutex *lock);
- extern int rt_mutex_timed_lock(struct rt_mutex *lock,
- struct hrtimer_sleeper *timeout);
-
- diff -Nur linux-4.1.39.orig/include/linux/rwlock_rt.h linux-4.1.39/include/linux/rwlock_rt.h
- --- linux-4.1.39.orig/include/linux/rwlock_rt.h 1970-01-01 01:00:00.000000000 +0100
- +++ linux-4.1.39/include/linux/rwlock_rt.h 2017-04-18 17:56:30.609396976 +0200
- @@ -0,0 +1,99 @@
- +#ifndef __LINUX_RWLOCK_RT_H
- +#define __LINUX_RWLOCK_RT_H
- +
- +#ifndef __LINUX_SPINLOCK_H
- +#error Do not include directly. Use spinlock.h
- +#endif
- +
- +#define rwlock_init(rwl) \
- +do { \
- + static struct lock_class_key __key; \
- + \
- + rt_mutex_init(&(rwl)->lock); \
- + __rt_rwlock_init(rwl, #rwl, &__key); \
- +} while (0)
- +
- +extern void __lockfunc rt_write_lock(rwlock_t *rwlock);
- +extern void __lockfunc rt_read_lock(rwlock_t *rwlock);
- +extern int __lockfunc rt_write_trylock(rwlock_t *rwlock);
- +extern int __lockfunc rt_write_trylock_irqsave(rwlock_t *trylock, unsigned long *flags);
- +extern int __lockfunc rt_read_trylock(rwlock_t *rwlock);
- +extern void __lockfunc rt_write_unlock(rwlock_t *rwlock);
- +extern void __lockfunc rt_read_unlock(rwlock_t *rwlock);
- +extern unsigned long __lockfunc rt_write_lock_irqsave(rwlock_t *rwlock);
- +extern unsigned long __lockfunc rt_read_lock_irqsave(rwlock_t *rwlock);
- +extern void __rt_rwlock_init(rwlock_t *rwlock, char *name, struct lock_class_key *key);
- +
- +#define read_trylock(lock) __cond_lock(lock, rt_read_trylock(lock))
- +#define write_trylock(lock) __cond_lock(lock, rt_write_trylock(lock))
- +
- +#define write_trylock_irqsave(lock, flags) \
- + __cond_lock(lock, rt_write_trylock_irqsave(lock, &flags))
- +
- +#define read_lock_irqsave(lock, flags) \
- + do { \
- + typecheck(unsigned long, flags); \
- + flags = rt_read_lock_irqsave(lock); \
- + } while (0)
- +
- +#define write_lock_irqsave(lock, flags) \
- + do { \
- + typecheck(unsigned long, flags); \
- + flags = rt_write_lock_irqsave(lock); \
- + } while (0)
- +
- +#define read_lock(lock) rt_read_lock(lock)
- +
- +#define read_lock_bh(lock) \
- + do { \
- + local_bh_disable(); \
- + rt_read_lock(lock); \
- + } while (0)
- +
- +#define read_lock_irq(lock) read_lock(lock)
- +
- +#define write_lock(lock) rt_write_lock(lock)
- +
- +#define write_lock_bh(lock) \
- + do { \
- + local_bh_disable(); \
- + rt_write_lock(lock); \
- + } while (0)
- +
- +#define write_lock_irq(lock) write_lock(lock)
- +
- +#define read_unlock(lock) rt_read_unlock(lock)
- +
- +#define read_unlock_bh(lock) \
- + do { \
- + rt_read_unlock(lock); \
- + local_bh_enable(); \
- + } while (0)
- +
- +#define read_unlock_irq(lock) read_unlock(lock)
- +
- +#define write_unlock(lock) rt_write_unlock(lock)
- +
- +#define write_unlock_bh(lock) \
- + do { \
- + rt_write_unlock(lock); \
- + local_bh_enable(); \
- + } while (0)
- +
- +#define write_unlock_irq(lock) write_unlock(lock)
- +
- +#define read_unlock_irqrestore(lock, flags) \
- + do { \
- + typecheck(unsigned long, flags); \
- + (void) flags; \
- + rt_read_unlock(lock); \
- + } while (0)
- +
- +#define write_unlock_irqrestore(lock, flags) \
- + do { \
- + typecheck(unsigned long, flags); \
- + (void) flags; \
- + rt_write_unlock(lock); \
- + } while (0)
- +
- +#endif
- diff -Nur linux-4.1.39.orig/include/linux/rwlock_types.h linux-4.1.39/include/linux/rwlock_types.h
- --- linux-4.1.39.orig/include/linux/rwlock_types.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/rwlock_types.h 2017-04-18 17:56:30.609396976 +0200
- @@ -1,6 +1,10 @@
- #ifndef __LINUX_RWLOCK_TYPES_H
- #define __LINUX_RWLOCK_TYPES_H
-
- +#if !defined(__LINUX_SPINLOCK_TYPES_H)
- +# error "Do not include directly, include spinlock_types.h"
- +#endif
- +
- /*
- * include/linux/rwlock_types.h - generic rwlock type definitions
- * and initializers
- @@ -43,6 +47,7 @@
- RW_DEP_MAP_INIT(lockname) }
- #endif
-
- -#define DEFINE_RWLOCK(x) rwlock_t x = __RW_LOCK_UNLOCKED(x)
- +#define DEFINE_RWLOCK(name) \
- + rwlock_t name __cacheline_aligned_in_smp = __RW_LOCK_UNLOCKED(name)
-
- #endif /* __LINUX_RWLOCK_TYPES_H */
- diff -Nur linux-4.1.39.orig/include/linux/rwlock_types_rt.h linux-4.1.39/include/linux/rwlock_types_rt.h
- --- linux-4.1.39.orig/include/linux/rwlock_types_rt.h 1970-01-01 01:00:00.000000000 +0100
- +++ linux-4.1.39/include/linux/rwlock_types_rt.h 2017-04-18 17:56:30.609396976 +0200
- @@ -0,0 +1,33 @@
- +#ifndef __LINUX_RWLOCK_TYPES_RT_H
- +#define __LINUX_RWLOCK_TYPES_RT_H
- +
- +#ifndef __LINUX_SPINLOCK_TYPES_H
- +#error "Do not include directly. Include spinlock_types.h instead"
- +#endif
- +
- +/*
- + * rwlocks - rtmutex which allows single reader recursion
- + */
- +typedef struct {
- + struct rt_mutex lock;
- + int read_depth;
- + unsigned int break_lock;
- +#ifdef CONFIG_DEBUG_LOCK_ALLOC
- + struct lockdep_map dep_map;
- +#endif
- +} rwlock_t;
- +
- +#ifdef CONFIG_DEBUG_LOCK_ALLOC
- +# define RW_DEP_MAP_INIT(lockname) .dep_map = { .name = #lockname }
- +#else
- +# define RW_DEP_MAP_INIT(lockname)
- +#endif
- +
- +#define __RW_LOCK_UNLOCKED(name) \
- + { .lock = __RT_MUTEX_INITIALIZER_SAVE_STATE(name.lock), \
- + RW_DEP_MAP_INIT(name) }
- +
- +#define DEFINE_RWLOCK(name) \
- + rwlock_t name __cacheline_aligned_in_smp = __RW_LOCK_UNLOCKED(name)
- +
- +#endif
- diff -Nur linux-4.1.39.orig/include/linux/rwsem.h linux-4.1.39/include/linux/rwsem.h
- --- linux-4.1.39.orig/include/linux/rwsem.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/rwsem.h 2017-04-18 17:56:30.609396976 +0200
- @@ -18,6 +18,10 @@
- #include <linux/osq_lock.h>
- #endif
-
- +#ifdef CONFIG_PREEMPT_RT_FULL
- +#include <linux/rwsem_rt.h>
- +#else /* PREEMPT_RT_FULL */
- +
- struct rw_semaphore;
-
- #ifdef CONFIG_RWSEM_GENERIC_SPINLOCK
- @@ -177,4 +181,6 @@
- # define up_read_non_owner(sem) up_read(sem)
- #endif
-
- +#endif /* !PREEMPT_RT_FULL */
- +
- #endif /* _LINUX_RWSEM_H */
- diff -Nur linux-4.1.39.orig/include/linux/rwsem_rt.h linux-4.1.39/include/linux/rwsem_rt.h
- --- linux-4.1.39.orig/include/linux/rwsem_rt.h 1970-01-01 01:00:00.000000000 +0100
- +++ linux-4.1.39/include/linux/rwsem_rt.h 2017-04-18 17:56:30.609396976 +0200
- @@ -0,0 +1,140 @@
- +#ifndef _LINUX_RWSEM_RT_H
- +#define _LINUX_RWSEM_RT_H
- +
- +#ifndef _LINUX_RWSEM_H
- +#error "Include rwsem.h"
- +#endif
- +
- +/*
- + * RW-semaphores are a spinlock plus a reader-depth count.
- + *
- + * Note that the semantics are different from the usual
- + * Linux rw-sems, in PREEMPT_RT mode we do not allow
- + * multiple readers to hold the lock at once, we only allow
- + * a read-lock owner to read-lock recursively. This is
- + * better for latency, makes the implementation inherently
- + * fair and makes it simpler as well.
- + */
- +
- +#include <linux/rtmutex.h>
- +
- +struct rw_semaphore {
- + struct rt_mutex lock;
- + int read_depth;
- +#ifdef CONFIG_DEBUG_LOCK_ALLOC
- + struct lockdep_map dep_map;
- +#endif
- +};
- +
- +#define __RWSEM_INITIALIZER(name) \
- + { .lock = __RT_MUTEX_INITIALIZER(name.lock), \
- + RW_DEP_MAP_INIT(name) }
- +
- +#define DECLARE_RWSEM(lockname) \
- + struct rw_semaphore lockname = __RWSEM_INITIALIZER(lockname)
- +
- +extern void __rt_rwsem_init(struct rw_semaphore *rwsem, const char *name,
- + struct lock_class_key *key);
- +
- +#define __rt_init_rwsem(sem, name, key) \
- + do { \
- + rt_mutex_init(&(sem)->lock); \
- + __rt_rwsem_init((sem), (name), (key));\
- + } while (0)
- +
- +#define __init_rwsem(sem, name, key) __rt_init_rwsem(sem, name, key)
- +
- +# define rt_init_rwsem(sem) \
- +do { \
- + static struct lock_class_key __key; \
- + \
- + __rt_init_rwsem((sem), #sem, &__key); \
- +} while (0)
- +
- +extern void rt_down_write(struct rw_semaphore *rwsem);
- +extern void rt_down_read_nested(struct rw_semaphore *rwsem, int subclass);
- +extern void rt_down_write_nested(struct rw_semaphore *rwsem, int subclass);
- +extern void rt_down_write_nested_lock(struct rw_semaphore *rwsem,
- + struct lockdep_map *nest);
- +extern void rt_down_read(struct rw_semaphore *rwsem);
- +extern int rt_down_write_trylock(struct rw_semaphore *rwsem);
- +extern int rt_down_read_trylock(struct rw_semaphore *rwsem);
- +extern void __rt_up_read(struct rw_semaphore *rwsem);
- +extern void rt_up_read(struct rw_semaphore *rwsem);
- +extern void rt_up_write(struct rw_semaphore *rwsem);
- +extern void rt_downgrade_write(struct rw_semaphore *rwsem);
- +
- +#define init_rwsem(sem) rt_init_rwsem(sem)
- +#define rwsem_is_locked(s) rt_mutex_is_locked(&(s)->lock)
- +
- +static inline int rwsem_is_contended(struct rw_semaphore *sem)
- +{
- + /* rt_mutex_has_waiters() */
- + return !RB_EMPTY_ROOT(&sem->lock.waiters);
- +}
- +
- +static inline void down_read(struct rw_semaphore *sem)
- +{
- + rt_down_read(sem);
- +}
- +
- +static inline int down_read_trylock(struct rw_semaphore *sem)
- +{
- + return rt_down_read_trylock(sem);
- +}
- +
- +static inline void down_write(struct rw_semaphore *sem)
- +{
- + rt_down_write(sem);
- +}
- +
- +static inline int down_write_trylock(struct rw_semaphore *sem)
- +{
- + return rt_down_write_trylock(sem);
- +}
- +
- +static inline void __up_read(struct rw_semaphore *sem)
- +{
- + __rt_up_read(sem);
- +}
- +
- +static inline void up_read(struct rw_semaphore *sem)
- +{
- + rt_up_read(sem);
- +}
- +
- +static inline void up_write(struct rw_semaphore *sem)
- +{
- + rt_up_write(sem);
- +}
- +
- +static inline void downgrade_write(struct rw_semaphore *sem)
- +{
- + rt_downgrade_write(sem);
- +}
- +
- +static inline void down_read_nested(struct rw_semaphore *sem, int subclass)
- +{
- + return rt_down_read_nested(sem, subclass);
- +}
- +
- +static inline void down_write_nested(struct rw_semaphore *sem, int subclass)
- +{
- + rt_down_write_nested(sem, subclass);
- +}
- +#ifdef CONFIG_DEBUG_LOCK_ALLOC
- +static inline void down_write_nest_lock(struct rw_semaphore *sem,
- + struct rw_semaphore *nest_lock)
- +{
- + rt_down_write_nested_lock(sem, &nest_lock->dep_map);
- +}
- +
- +#else
- +
- +static inline void down_write_nest_lock(struct rw_semaphore *sem,
- + struct rw_semaphore *nest_lock)
- +{
- + rt_down_write_nested_lock(sem, NULL);
- +}
- +#endif
- +#endif
- diff -Nur linux-4.1.39.orig/include/linux/sched.h linux-4.1.39/include/linux/sched.h
- --- linux-4.1.39.orig/include/linux/sched.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/sched.h 2017-04-18 17:56:30.609396976 +0200
- @@ -26,6 +26,7 @@
- #include <linux/nodemask.h>
- #include <linux/mm_types.h>
- #include <linux/preempt_mask.h>
- +#include <asm/kmap_types.h>
-
- #include <asm/page.h>
- #include <asm/ptrace.h>
- @@ -175,8 +176,6 @@
- extern void calc_global_load(unsigned long ticks);
- extern void update_cpu_load_nohz(void);
-
- -extern unsigned long get_parent_ip(unsigned long addr);
- -
- extern void dump_cpu_task(int cpu);
-
- struct seq_file;
- @@ -234,10 +233,7 @@
- TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
- __TASK_TRACED | EXIT_ZOMBIE | EXIT_DEAD)
-
- -#define task_is_traced(task) ((task->state & __TASK_TRACED) != 0)
- #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0)
- -#define task_is_stopped_or_traced(task) \
- - ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
- #define task_contributes_to_load(task) \
- ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \
- (task->flags & PF_FROZEN) == 0)
- @@ -302,6 +298,11 @@
-
- #endif
-
- +#define __set_current_state_no_track(state_value) \
- + do { current->state = (state_value); } while (0)
- +#define set_current_state_no_track(state_value) \
- + set_mb(current->state, (state_value))
- +
- /* Task command name length */
- #define TASK_COMM_LEN 16
-
- @@ -902,6 +903,50 @@
- #define SCHED_CAPACITY_SCALE (1L << SCHED_CAPACITY_SHIFT)
-
- /*
- + * Wake-queues are lists of tasks with a pending wakeup, whose
- + * callers have already marked the task as woken internally,
- + * and can thus carry on. A common use case is being able to
- + * do the wakeups once the corresponding user lock as been
- + * released.
- + *
- + * We hold reference to each task in the list across the wakeup,
- + * thus guaranteeing that the memory is still valid by the time
- + * the actual wakeups are performed in wake_up_q().
- + *
- + * One per task suffices, because there's never a need for a task to be
- + * in two wake queues simultaneously; it is forbidden to abandon a task
- + * in a wake queue (a call to wake_up_q() _must_ follow), so if a task is
- + * already in a wake queue, the wakeup will happen soon and the second
- + * waker can just skip it.
- + *
- + * The WAKE_Q macro declares and initializes the list head.
- + * wake_up_q() does NOT reinitialize the list; it's expected to be
- + * called near the end of a function, where the fact that the queue is
- + * not used again will be easy to see by inspection.
- + *
- + * Note that this can cause spurious wakeups. schedule() callers
- + * must ensure the call is done inside a loop, confirming that the
- + * wakeup condition has in fact occurred.
- + */
- +struct wake_q_node {
- + struct wake_q_node *next;
- +};
- +
- +struct wake_q_head {
- + struct wake_q_node *first;
- + struct wake_q_node **lastp;
- +};
- +
- +#define WAKE_Q_TAIL ((struct wake_q_node *) 0x01)
- +
- +#define WAKE_Q(name) \
- + struct wake_q_head name = { WAKE_Q_TAIL, &name.first }
- +
- +extern void wake_q_add(struct wake_q_head *head,
- + struct task_struct *task);
- +extern void wake_up_q(struct wake_q_head *head);
- +
- +/*
- * sched-domains (multiprocessor balancing) declarations:
- */
- #ifdef CONFIG_SMP
- @@ -1293,6 +1338,7 @@
-
- struct task_struct {
- volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
- + volatile long saved_state; /* saved state for "spinlock sleepers" */
- void *stack;
- atomic_t usage;
- unsigned int flags; /* per process flags, defined below */
- @@ -1329,6 +1375,12 @@
- #endif
-
- unsigned int policy;
- +#ifdef CONFIG_PREEMPT_RT_FULL
- + int migrate_disable;
- +# ifdef CONFIG_SCHED_DEBUG
- + int migrate_disable_atomic;
- +# endif
- +#endif
- int nr_cpus_allowed;
- cpumask_t cpus_allowed;
-
- @@ -1436,7 +1488,8 @@
- struct cputime prev_cputime;
- #endif
- #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
- - seqlock_t vtime_seqlock;
- + raw_spinlock_t vtime_lock;
- + seqcount_t vtime_seq;
- unsigned long long vtime_snap;
- enum {
- VTIME_SLEEPING = 0,
- @@ -1452,6 +1505,9 @@
-
- struct task_cputime cputime_expires;
- struct list_head cpu_timers[3];
- +#ifdef CONFIG_PREEMPT_RT_BASE
- + struct task_struct *posix_timer_list;
- +#endif
-
- /* process credentials */
- const struct cred __rcu *ptracer_cred; /* Tracer's credentials at attach */
- @@ -1485,10 +1541,15 @@
- /* signal handlers */
- struct signal_struct *signal;
- struct sighand_struct *sighand;
- + struct sigqueue *sigqueue_cache;
-
- sigset_t blocked, real_blocked;
- sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */
- struct sigpending pending;
- +#ifdef CONFIG_PREEMPT_RT_FULL
- + /* TODO: move me into ->restart_block ? */
- + struct siginfo forced_info;
- +#endif
-
- unsigned long sas_ss_sp;
- size_t sas_ss_size;
- @@ -1514,6 +1575,8 @@
- /* Protection of the PI data structures: */
- raw_spinlock_t pi_lock;
-
- + struct wake_q_node wake_q;
- +
- #ifdef CONFIG_RT_MUTEXES
- /* PI waiters blocked on a rt_mutex held by this task */
- struct rb_root pi_waiters;
- @@ -1708,6 +1771,12 @@
- unsigned long trace;
- /* bitmask and counter of trace recursion */
- unsigned long trace_recursion;
- +#ifdef CONFIG_WAKEUP_LATENCY_HIST
- + u64 preempt_timestamp_hist;
- +#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST
- + long timer_offset;
- +#endif
- +#endif
- #endif /* CONFIG_TRACING */
- #ifdef CONFIG_MEMCG
- struct memcg_oom_info {
- @@ -1724,14 +1793,26 @@
- unsigned int sequential_io;
- unsigned int sequential_io_avg;
- #endif
- +#ifdef CONFIG_PREEMPT_RT_BASE
- + struct rcu_head put_rcu;
- + int softirq_nestcnt;
- + unsigned int softirqs_raised;
- +#endif
- +#ifdef CONFIG_PREEMPT_RT_FULL
- +# if defined CONFIG_HIGHMEM || defined CONFIG_X86_32
- + int kmap_idx;
- + pte_t kmap_pte[KM_TYPE_NR];
- +# endif
- +#endif
- #ifdef CONFIG_DEBUG_ATOMIC_SLEEP
- unsigned long task_state_change;
- #endif
- +#ifdef CONFIG_PREEMPT_RT_FULL
- + int xmit_recursion;
- +#endif
- + int pagefault_disabled;
- };
-
- -/* Future-safe accessor for struct task_struct's cpus_allowed. */
- -#define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed)
- -
- #define TNF_MIGRATED 0x01
- #define TNF_NO_GROUP 0x02
- #define TNF_SHARED 0x04
- @@ -1920,6 +2001,15 @@
- extern void free_task(struct task_struct *tsk);
- #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
-
- +#ifdef CONFIG_PREEMPT_RT_BASE
- +extern void __put_task_struct_cb(struct rcu_head *rhp);
- +
- +static inline void put_task_struct(struct task_struct *t)
- +{
- + if (atomic_dec_and_test(&t->usage))
- + call_rcu(&t->put_rcu, __put_task_struct_cb);
- +}
- +#else
- extern void __put_task_struct(struct task_struct *t);
-
- static inline void put_task_struct(struct task_struct *t)
- @@ -1927,6 +2017,7 @@
- if (atomic_dec_and_test(&t->usage))
- __put_task_struct(t);
- }
- +#endif
-
- #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
- extern void task_cputime(struct task_struct *t,
- @@ -1965,6 +2056,7 @@
- /*
- * Per process flags
- */
- +#define PF_IN_SOFTIRQ 0x00000001 /* Task is serving softirq */
- #define PF_EXITING 0x00000004 /* getting shut down */
- #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
- #define PF_VCPU 0x00000010 /* I'm a virtual CPU */
- @@ -2129,6 +2221,10 @@
-
- extern int set_cpus_allowed_ptr(struct task_struct *p,
- const struct cpumask *new_mask);
- +int migrate_me(void);
- +void tell_sched_cpu_down_begin(int cpu);
- +void tell_sched_cpu_down_done(int cpu);
- +
- #else
- static inline void do_set_cpus_allowed(struct task_struct *p,
- const struct cpumask *new_mask)
- @@ -2141,6 +2237,9 @@
- return -EINVAL;
- return 0;
- }
- +static inline int migrate_me(void) { return 0; }
- +static inline void tell_sched_cpu_down_begin(int cpu) { }
- +static inline void tell_sched_cpu_down_done(int cpu) { }
- #endif
-
- #ifdef CONFIG_NO_HZ_COMMON
- @@ -2357,6 +2456,7 @@
-
- extern int wake_up_state(struct task_struct *tsk, unsigned int state);
- extern int wake_up_process(struct task_struct *tsk);
- +extern int wake_up_lock_sleeper(struct task_struct * tsk);
- extern void wake_up_new_task(struct task_struct *tsk);
- #ifdef CONFIG_SMP
- extern void kick_process(struct task_struct *tsk);
- @@ -2473,12 +2573,24 @@
-
- /* mmdrop drops the mm and the page tables */
- extern void __mmdrop(struct mm_struct *);
- +
- static inline void mmdrop(struct mm_struct * mm)
- {
- if (unlikely(atomic_dec_and_test(&mm->mm_count)))
- __mmdrop(mm);
- }
-
- +#ifdef CONFIG_PREEMPT_RT_BASE
- +extern void __mmdrop_delayed(struct rcu_head *rhp);
- +static inline void mmdrop_delayed(struct mm_struct *mm)
- +{
- + if (atomic_dec_and_test(&mm->mm_count))
- + call_rcu(&mm->delayed_drop, __mmdrop_delayed);
- +}
- +#else
- +# define mmdrop_delayed(mm) mmdrop(mm)
- +#endif
- +
- /* mmput gets rid of the mappings and all user-space */
- extern void mmput(struct mm_struct *);
- /* Grab a reference to a task's mm, if it is not already going away */
- @@ -2790,6 +2902,43 @@
- return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
- }
-
- +#ifdef CONFIG_PREEMPT_LAZY
- +static inline void set_tsk_need_resched_lazy(struct task_struct *tsk)
- +{
- + set_tsk_thread_flag(tsk,TIF_NEED_RESCHED_LAZY);
- +}
- +
- +static inline void clear_tsk_need_resched_lazy(struct task_struct *tsk)
- +{
- + clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED_LAZY);
- +}
- +
- +static inline int test_tsk_need_resched_lazy(struct task_struct *tsk)
- +{
- + return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED_LAZY));
- +}
- +
- +static inline int need_resched_lazy(void)
- +{
- + return test_thread_flag(TIF_NEED_RESCHED_LAZY);
- +}
- +
- +static inline int need_resched_now(void)
- +{
- + return test_thread_flag(TIF_NEED_RESCHED);
- +}
- +
- +#else
- +static inline void clear_tsk_need_resched_lazy(struct task_struct *tsk) { }
- +static inline int need_resched_lazy(void) { return 0; }
- +
- +static inline int need_resched_now(void)
- +{
- + return test_thread_flag(TIF_NEED_RESCHED);
- +}
- +
- +#endif
- +
- static inline int restart_syscall(void)
- {
- set_tsk_thread_flag(current, TIF_SIGPENDING);
- @@ -2821,6 +2970,51 @@
- return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
- }
-
- +static inline bool __task_is_stopped_or_traced(struct task_struct *task)
- +{
- + if (task->state & (__TASK_STOPPED | __TASK_TRACED))
- + return true;
- +#ifdef CONFIG_PREEMPT_RT_FULL
- + if (task->saved_state & (__TASK_STOPPED | __TASK_TRACED))
- + return true;
- +#endif
- + return false;
- +}
- +
- +static inline bool task_is_stopped_or_traced(struct task_struct *task)
- +{
- + bool traced_stopped;
- +
- +#ifdef CONFIG_PREEMPT_RT_FULL
- + unsigned long flags;
- +
- + raw_spin_lock_irqsave(&task->pi_lock, flags);
- + traced_stopped = __task_is_stopped_or_traced(task);
- + raw_spin_unlock_irqrestore(&task->pi_lock, flags);
- +#else
- + traced_stopped = __task_is_stopped_or_traced(task);
- +#endif
- + return traced_stopped;
- +}
- +
- +static inline bool task_is_traced(struct task_struct *task)
- +{
- + bool traced = false;
- +
- + if (task->state & __TASK_TRACED)
- + return true;
- +#ifdef CONFIG_PREEMPT_RT_FULL
- + /* in case the task is sleeping on tasklist_lock */
- + raw_spin_lock_irq(&task->pi_lock);
- + if (task->state & __TASK_TRACED)
- + traced = true;
- + else if (task->saved_state & __TASK_TRACED)
- + traced = true;
- + raw_spin_unlock_irq(&task->pi_lock);
- +#endif
- + return traced;
- +}
- +
- /*
- * cond_resched() and cond_resched_lock(): latency reduction via
- * explicit rescheduling in places that are safe. The return
- @@ -2842,12 +3036,16 @@
- __cond_resched_lock(lock); \
- })
-
- +#ifndef CONFIG_PREEMPT_RT_FULL
- extern int __cond_resched_softirq(void);
-
- #define cond_resched_softirq() ({ \
- ___might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET); \
- __cond_resched_softirq(); \
- })
- +#else
- +# define cond_resched_softirq() cond_resched()
- +#endif
-
- static inline void cond_resched_rcu(void)
- {
- @@ -3014,6 +3212,26 @@
-
- #endif /* CONFIG_SMP */
-
- +static inline int __migrate_disabled(struct task_struct *p)
- +{
- +#ifdef CONFIG_PREEMPT_RT_FULL
- + return p->migrate_disable;
- +#else
- + return 0;
- +#endif
- +}
- +
- +/* Future-safe accessor for struct task_struct's cpus_allowed. */
- +static inline const struct cpumask *tsk_cpus_allowed(struct task_struct *p)
- +{
- +#ifdef CONFIG_PREEMPT_RT_FULL
- + if (p->migrate_disable)
- + return cpumask_of(task_cpu(p));
- +#endif
- +
- + return &p->cpus_allowed;
- +}
- +
- extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask);
- extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
-
- diff -Nur linux-4.1.39.orig/include/linux/seqlock.h linux-4.1.39/include/linux/seqlock.h
- --- linux-4.1.39.orig/include/linux/seqlock.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/seqlock.h 2017-04-18 17:56:30.609396976 +0200
- @@ -219,20 +219,30 @@
- return __read_seqcount_retry(s, start);
- }
-
- -
- -
- -static inline void raw_write_seqcount_begin(seqcount_t *s)
- +static inline void __raw_write_seqcount_begin(seqcount_t *s)
- {
- s->sequence++;
- smp_wmb();
- }
-
- -static inline void raw_write_seqcount_end(seqcount_t *s)
- +static inline void raw_write_seqcount_begin(seqcount_t *s)
- +{
- + preempt_disable_rt();
- + __raw_write_seqcount_begin(s);
- +}
- +
- +static inline void __raw_write_seqcount_end(seqcount_t *s)
- {
- smp_wmb();
- s->sequence++;
- }
-
- +static inline void raw_write_seqcount_end(seqcount_t *s)
- +{
- + __raw_write_seqcount_end(s);
- + preempt_enable_rt();
- +}
- +
- /*
- * raw_write_seqcount_latch - redirect readers to even/odd copy
- * @s: pointer to seqcount_t
- @@ -305,10 +315,32 @@
- /*
- * Read side functions for starting and finalizing a read side section.
- */
- +#ifndef CONFIG_PREEMPT_RT_FULL
- static inline unsigned read_seqbegin(const seqlock_t *sl)
- {
- return read_seqcount_begin(&sl->seqcount);
- }
- +#else
- +/*
- + * Starvation safe read side for RT
- + */
- +static inline unsigned read_seqbegin(seqlock_t *sl)
- +{
- + unsigned ret;
- +
- +repeat:
- + ret = ACCESS_ONCE(sl->seqcount.sequence);
- + if (unlikely(ret & 1)) {
- + /*
- + * Take the lock and let the writer proceed (i.e. evtl
- + * boost it), otherwise we could loop here forever.
- + */
- + spin_unlock_wait(&sl->lock);
- + goto repeat;
- + }
- + return ret;
- +}
- +#endif
-
- static inline unsigned read_seqretry(const seqlock_t *sl, unsigned start)
- {
- @@ -323,36 +355,36 @@
- static inline void write_seqlock(seqlock_t *sl)
- {
- spin_lock(&sl->lock);
- - write_seqcount_begin(&sl->seqcount);
- + __raw_write_seqcount_begin(&sl->seqcount);
- }
-
- static inline void write_sequnlock(seqlock_t *sl)
- {
- - write_seqcount_end(&sl->seqcount);
- + __raw_write_seqcount_end(&sl->seqcount);
- spin_unlock(&sl->lock);
- }
-
- static inline void write_seqlock_bh(seqlock_t *sl)
- {
- spin_lock_bh(&sl->lock);
- - write_seqcount_begin(&sl->seqcount);
- + __raw_write_seqcount_begin(&sl->seqcount);
- }
-
- static inline void write_sequnlock_bh(seqlock_t *sl)
- {
- - write_seqcount_end(&sl->seqcount);
- + __raw_write_seqcount_end(&sl->seqcount);
- spin_unlock_bh(&sl->lock);
- }
-
- static inline void write_seqlock_irq(seqlock_t *sl)
- {
- spin_lock_irq(&sl->lock);
- - write_seqcount_begin(&sl->seqcount);
- + __raw_write_seqcount_begin(&sl->seqcount);
- }
-
- static inline void write_sequnlock_irq(seqlock_t *sl)
- {
- - write_seqcount_end(&sl->seqcount);
- + __raw_write_seqcount_end(&sl->seqcount);
- spin_unlock_irq(&sl->lock);
- }
-
- @@ -361,7 +393,7 @@
- unsigned long flags;
-
- spin_lock_irqsave(&sl->lock, flags);
- - write_seqcount_begin(&sl->seqcount);
- + __raw_write_seqcount_begin(&sl->seqcount);
- return flags;
- }
-
- @@ -371,7 +403,7 @@
- static inline void
- write_sequnlock_irqrestore(seqlock_t *sl, unsigned long flags)
- {
- - write_seqcount_end(&sl->seqcount);
- + __raw_write_seqcount_end(&sl->seqcount);
- spin_unlock_irqrestore(&sl->lock, flags);
- }
-
- diff -Nur linux-4.1.39.orig/include/linux/signal.h linux-4.1.39/include/linux/signal.h
- --- linux-4.1.39.orig/include/linux/signal.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/signal.h 2017-04-18 17:56:30.609396976 +0200
- @@ -233,6 +233,7 @@
- }
-
- extern void flush_sigqueue(struct sigpending *queue);
- +extern void flush_task_sigqueue(struct task_struct *tsk);
-
- /* Test if 'sig' is valid signal. Use this instead of testing _NSIG directly */
- static inline int valid_signal(unsigned long sig)
- diff -Nur linux-4.1.39.orig/include/linux/skbuff.h linux-4.1.39/include/linux/skbuff.h
- --- linux-4.1.39.orig/include/linux/skbuff.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/skbuff.h 2017-04-18 17:56:30.613397130 +0200
- @@ -187,6 +187,7 @@
-
- __u32 qlen;
- spinlock_t lock;
- + raw_spinlock_t raw_lock;
- };
-
- struct sk_buff;
- @@ -1337,6 +1338,12 @@
- __skb_queue_head_init(list);
- }
-
- +static inline void skb_queue_head_init_raw(struct sk_buff_head *list)
- +{
- + raw_spin_lock_init(&list->raw_lock);
- + __skb_queue_head_init(list);
- +}
- +
- static inline void skb_queue_head_init_class(struct sk_buff_head *list,
- struct lock_class_key *class)
- {
- diff -Nur linux-4.1.39.orig/include/linux/smp.h linux-4.1.39/include/linux/smp.h
- --- linux-4.1.39.orig/include/linux/smp.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/smp.h 2017-04-18 17:56:30.613397130 +0200
- @@ -185,6 +185,9 @@
- #define get_cpu() ({ preempt_disable(); smp_processor_id(); })
- #define put_cpu() preempt_enable()
-
- +#define get_cpu_light() ({ migrate_disable(); smp_processor_id(); })
- +#define put_cpu_light() migrate_enable()
- +
- /*
- * Callback to arch code if there's nosmp or maxcpus=0 on the
- * boot command line:
- diff -Nur linux-4.1.39.orig/include/linux/spinlock_api_smp.h linux-4.1.39/include/linux/spinlock_api_smp.h
- --- linux-4.1.39.orig/include/linux/spinlock_api_smp.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/spinlock_api_smp.h 2017-04-18 17:56:30.613397130 +0200
- @@ -189,6 +189,8 @@
- return 0;
- }
-
- -#include <linux/rwlock_api_smp.h>
- +#ifndef CONFIG_PREEMPT_RT_FULL
- +# include <linux/rwlock_api_smp.h>
- +#endif
-
- #endif /* __LINUX_SPINLOCK_API_SMP_H */
- diff -Nur linux-4.1.39.orig/include/linux/spinlock.h linux-4.1.39/include/linux/spinlock.h
- --- linux-4.1.39.orig/include/linux/spinlock.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/spinlock.h 2017-04-18 17:56:30.613397130 +0200
- @@ -281,7 +281,11 @@
- #define raw_spin_can_lock(lock) (!raw_spin_is_locked(lock))
-
- /* Include rwlock functions */
- -#include <linux/rwlock.h>
- +#ifdef CONFIG_PREEMPT_RT_FULL
- +# include <linux/rwlock_rt.h>
- +#else
- +# include <linux/rwlock.h>
- +#endif
-
- /*
- * Pull the _spin_*()/_read_*()/_write_*() functions/declarations:
- @@ -292,6 +296,10 @@
- # include <linux/spinlock_api_up.h>
- #endif
-
- +#ifdef CONFIG_PREEMPT_RT_FULL
- +# include <linux/spinlock_rt.h>
- +#else /* PREEMPT_RT_FULL */
- +
- /*
- * Map the spin_lock functions to the raw variants for PREEMPT_RT=n
- */
- @@ -426,4 +434,6 @@
- #define atomic_dec_and_lock(atomic, lock) \
- __cond_lock(lock, _atomic_dec_and_lock(atomic, lock))
-
- +#endif /* !PREEMPT_RT_FULL */
- +
- #endif /* __LINUX_SPINLOCK_H */
- diff -Nur linux-4.1.39.orig/include/linux/spinlock_rt.h linux-4.1.39/include/linux/spinlock_rt.h
- --- linux-4.1.39.orig/include/linux/spinlock_rt.h 1970-01-01 01:00:00.000000000 +0100
- +++ linux-4.1.39/include/linux/spinlock_rt.h 2017-04-18 17:56:30.613397130 +0200
- @@ -0,0 +1,174 @@
- +#ifndef __LINUX_SPINLOCK_RT_H
- +#define __LINUX_SPINLOCK_RT_H
- +
- +#ifndef __LINUX_SPINLOCK_H
- +#error Do not include directly. Use spinlock.h
- +#endif
- +
- +#include <linux/bug.h>
- +
- +extern void
- +__rt_spin_lock_init(spinlock_t *lock, char *name, struct lock_class_key *key);
- +
- +#define spin_lock_init(slock) \
- +do { \
- + static struct lock_class_key __key; \
- + \
- + rt_mutex_init(&(slock)->lock); \
- + __rt_spin_lock_init(slock, #slock, &__key); \
- +} while (0)
- +
- +extern void __lockfunc rt_spin_lock(spinlock_t *lock);
- +extern unsigned long __lockfunc rt_spin_lock_trace_flags(spinlock_t *lock);
- +extern void __lockfunc rt_spin_lock_nested(spinlock_t *lock, int subclass);
- +extern void __lockfunc rt_spin_unlock(spinlock_t *lock);
- +extern void __lockfunc rt_spin_unlock_wait(spinlock_t *lock);
- +extern int __lockfunc rt_spin_trylock_irqsave(spinlock_t *lock, unsigned long *flags);
- +extern int __lockfunc rt_spin_trylock_bh(spinlock_t *lock);
- +extern int __lockfunc rt_spin_trylock(spinlock_t *lock);
- +extern int atomic_dec_and_spin_lock(atomic_t *atomic, spinlock_t *lock);
- +
- +/*
- + * lockdep-less calls, for derived types like rwlock:
- + * (for trylock they can use rt_mutex_trylock() directly.
- + */
- +extern void __lockfunc __rt_spin_lock(struct rt_mutex *lock);
- +extern void __lockfunc __rt_spin_unlock(struct rt_mutex *lock);
- +extern int __lockfunc __rt_spin_trylock(struct rt_mutex *lock);
- +
- +#define spin_lock(lock) \
- + do { \
- + migrate_disable(); \
- + rt_spin_lock(lock); \
- + } while (0)
- +
- +#define spin_lock_bh(lock) \
- + do { \
- + local_bh_disable(); \
- + migrate_disable(); \
- + rt_spin_lock(lock); \
- + } while (0)
- +
- +#define spin_lock_irq(lock) spin_lock(lock)
- +
- +#define spin_do_trylock(lock) __cond_lock(lock, rt_spin_trylock(lock))
- +
- +#define spin_trylock(lock) \
- +({ \
- + int __locked; \
- + migrate_disable(); \
- + __locked = spin_do_trylock(lock); \
- + if (!__locked) \
- + migrate_enable(); \
- + __locked; \
- +})
- +
- +#ifdef CONFIG_LOCKDEP
- +# define spin_lock_nested(lock, subclass) \
- + do { \
- + migrate_disable(); \
- + rt_spin_lock_nested(lock, subclass); \
- + } while (0)
- +
- +#define spin_lock_bh_nested(lock, subclass) \
- + do { \
- + local_bh_disable(); \
- + migrate_disable(); \
- + rt_spin_lock_nested(lock, subclass); \
- + } while (0)
- +
- +# define spin_lock_irqsave_nested(lock, flags, subclass) \
- + do { \
- + typecheck(unsigned long, flags); \
- + flags = 0; \
- + migrate_disable(); \
- + rt_spin_lock_nested(lock, subclass); \
- + } while (0)
- +#else
- +# define spin_lock_nested(lock, subclass) spin_lock(lock)
- +# define spin_lock_bh_nested(lock, subclass) spin_lock_bh(lock)
- +
- +# define spin_lock_irqsave_nested(lock, flags, subclass) \
- + do { \
- + typecheck(unsigned long, flags); \
- + flags = 0; \
- + spin_lock(lock); \
- + } while (0)
- +#endif
- +
- +#define spin_lock_irqsave(lock, flags) \
- + do { \
- + typecheck(unsigned long, flags); \
- + flags = 0; \
- + spin_lock(lock); \
- + } while (0)
- +
- +static inline unsigned long spin_lock_trace_flags(spinlock_t *lock)
- +{
- + unsigned long flags = 0;
- +#ifdef CONFIG_TRACE_IRQFLAGS
- + flags = rt_spin_lock_trace_flags(lock);
- +#else
- + spin_lock(lock); /* lock_local */
- +#endif
- + return flags;
- +}
- +
- +/* FIXME: we need rt_spin_lock_nest_lock */
- +#define spin_lock_nest_lock(lock, nest_lock) spin_lock_nested(lock, 0)
- +
- +#define spin_unlock(lock) \
- + do { \
- + rt_spin_unlock(lock); \
- + migrate_enable(); \
- + } while (0)
- +
- +#define spin_unlock_bh(lock) \
- + do { \
- + rt_spin_unlock(lock); \
- + migrate_enable(); \
- + local_bh_enable(); \
- + } while (0)
- +
- +#define spin_unlock_irq(lock) spin_unlock(lock)
- +
- +#define spin_unlock_irqrestore(lock, flags) \
- + do { \
- + typecheck(unsigned long, flags); \
- + (void) flags; \
- + spin_unlock(lock); \
- + } while (0)
- +
- +#define spin_trylock_bh(lock) __cond_lock(lock, rt_spin_trylock_bh(lock))
- +#define spin_trylock_irq(lock) spin_trylock(lock)
- +
- +#define spin_trylock_irqsave(lock, flags) \
- + rt_spin_trylock_irqsave(lock, &(flags))
- +
- +#define spin_unlock_wait(lock) rt_spin_unlock_wait(lock)
- +
- +#ifdef CONFIG_GENERIC_LOCKBREAK
- +# define spin_is_contended(lock) ((lock)->break_lock)
- +#else
- +# define spin_is_contended(lock) (((void)(lock), 0))
- +#endif
- +
- +static inline int spin_can_lock(spinlock_t *lock)
- +{
- + return !rt_mutex_is_locked(&lock->lock);
- +}
- +
- +static inline int spin_is_locked(spinlock_t *lock)
- +{
- + return rt_mutex_is_locked(&lock->lock);
- +}
- +
- +static inline void assert_spin_locked(spinlock_t *lock)
- +{
- + BUG_ON(!spin_is_locked(lock));
- +}
- +
- +#define atomic_dec_and_lock(atomic, lock) \
- + atomic_dec_and_spin_lock(atomic, lock)
- +
- +#endif
- diff -Nur linux-4.1.39.orig/include/linux/spinlock_types.h linux-4.1.39/include/linux/spinlock_types.h
- --- linux-4.1.39.orig/include/linux/spinlock_types.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/spinlock_types.h 2017-04-18 17:56:30.613397130 +0200
- @@ -9,80 +9,15 @@
- * Released under the General Public License (GPL).
- */
-
- -#if defined(CONFIG_SMP)
- -# include <asm/spinlock_types.h>
- -#else
- -# include <linux/spinlock_types_up.h>
- -#endif
- -
- -#include <linux/lockdep.h>
- -
- -typedef struct raw_spinlock {
- - arch_spinlock_t raw_lock;
- -#ifdef CONFIG_GENERIC_LOCKBREAK
- - unsigned int break_lock;
- -#endif
- -#ifdef CONFIG_DEBUG_SPINLOCK
- - unsigned int magic, owner_cpu;
- - void *owner;
- -#endif
- -#ifdef CONFIG_DEBUG_LOCK_ALLOC
- - struct lockdep_map dep_map;
- -#endif
- -} raw_spinlock_t;
- -
- -#define SPINLOCK_MAGIC 0xdead4ead
- -
- -#define SPINLOCK_OWNER_INIT ((void *)-1L)
- -
- -#ifdef CONFIG_DEBUG_LOCK_ALLOC
- -# define SPIN_DEP_MAP_INIT(lockname) .dep_map = { .name = #lockname }
- -#else
- -# define SPIN_DEP_MAP_INIT(lockname)
- -#endif
- +#include <linux/spinlock_types_raw.h>
-
- -#ifdef CONFIG_DEBUG_SPINLOCK
- -# define SPIN_DEBUG_INIT(lockname) \
- - .magic = SPINLOCK_MAGIC, \
- - .owner_cpu = -1, \
- - .owner = SPINLOCK_OWNER_INIT,
- +#ifndef CONFIG_PREEMPT_RT_FULL
- +# include <linux/spinlock_types_nort.h>
- +# include <linux/rwlock_types.h>
- #else
- -# define SPIN_DEBUG_INIT(lockname)
- +# include <linux/rtmutex.h>
- +# include <linux/spinlock_types_rt.h>
- +# include <linux/rwlock_types_rt.h>
- #endif
-
- -#define __RAW_SPIN_LOCK_INITIALIZER(lockname) \
- - { \
- - .raw_lock = __ARCH_SPIN_LOCK_UNLOCKED, \
- - SPIN_DEBUG_INIT(lockname) \
- - SPIN_DEP_MAP_INIT(lockname) }
- -
- -#define __RAW_SPIN_LOCK_UNLOCKED(lockname) \
- - (raw_spinlock_t) __RAW_SPIN_LOCK_INITIALIZER(lockname)
- -
- -#define DEFINE_RAW_SPINLOCK(x) raw_spinlock_t x = __RAW_SPIN_LOCK_UNLOCKED(x)
- -
- -typedef struct spinlock {
- - union {
- - struct raw_spinlock rlock;
- -
- -#ifdef CONFIG_DEBUG_LOCK_ALLOC
- -# define LOCK_PADSIZE (offsetof(struct raw_spinlock, dep_map))
- - struct {
- - u8 __padding[LOCK_PADSIZE];
- - struct lockdep_map dep_map;
- - };
- -#endif
- - };
- -} spinlock_t;
- -
- -#define __SPIN_LOCK_INITIALIZER(lockname) \
- - { { .rlock = __RAW_SPIN_LOCK_INITIALIZER(lockname) } }
- -
- -#define __SPIN_LOCK_UNLOCKED(lockname) \
- - (spinlock_t ) __SPIN_LOCK_INITIALIZER(lockname)
- -
- -#define DEFINE_SPINLOCK(x) spinlock_t x = __SPIN_LOCK_UNLOCKED(x)
- -
- -#include <linux/rwlock_types.h>
- -
- #endif /* __LINUX_SPINLOCK_TYPES_H */
- diff -Nur linux-4.1.39.orig/include/linux/spinlock_types_nort.h linux-4.1.39/include/linux/spinlock_types_nort.h
- --- linux-4.1.39.orig/include/linux/spinlock_types_nort.h 1970-01-01 01:00:00.000000000 +0100
- +++ linux-4.1.39/include/linux/spinlock_types_nort.h 2017-04-18 17:56:30.613397130 +0200
- @@ -0,0 +1,33 @@
- +#ifndef __LINUX_SPINLOCK_TYPES_NORT_H
- +#define __LINUX_SPINLOCK_TYPES_NORT_H
- +
- +#ifndef __LINUX_SPINLOCK_TYPES_H
- +#error "Do not include directly. Include spinlock_types.h instead"
- +#endif
- +
- +/*
- + * The non RT version maps spinlocks to raw_spinlocks
- + */
- +typedef struct spinlock {
- + union {
- + struct raw_spinlock rlock;
- +
- +#ifdef CONFIG_DEBUG_LOCK_ALLOC
- +# define LOCK_PADSIZE (offsetof(struct raw_spinlock, dep_map))
- + struct {
- + u8 __padding[LOCK_PADSIZE];
- + struct lockdep_map dep_map;
- + };
- +#endif
- + };
- +} spinlock_t;
- +
- +#define __SPIN_LOCK_INITIALIZER(lockname) \
- + { { .rlock = __RAW_SPIN_LOCK_INITIALIZER(lockname) } }
- +
- +#define __SPIN_LOCK_UNLOCKED(lockname) \
- + (spinlock_t ) __SPIN_LOCK_INITIALIZER(lockname)
- +
- +#define DEFINE_SPINLOCK(x) spinlock_t x = __SPIN_LOCK_UNLOCKED(x)
- +
- +#endif
- diff -Nur linux-4.1.39.orig/include/linux/spinlock_types_raw.h linux-4.1.39/include/linux/spinlock_types_raw.h
- --- linux-4.1.39.orig/include/linux/spinlock_types_raw.h 1970-01-01 01:00:00.000000000 +0100
- +++ linux-4.1.39/include/linux/spinlock_types_raw.h 2017-04-18 17:56:30.613397130 +0200
- @@ -0,0 +1,56 @@
- +#ifndef __LINUX_SPINLOCK_TYPES_RAW_H
- +#define __LINUX_SPINLOCK_TYPES_RAW_H
- +
- +#if defined(CONFIG_SMP)
- +# include <asm/spinlock_types.h>
- +#else
- +# include <linux/spinlock_types_up.h>
- +#endif
- +
- +#include <linux/lockdep.h>
- +
- +typedef struct raw_spinlock {
- + arch_spinlock_t raw_lock;
- +#ifdef CONFIG_GENERIC_LOCKBREAK
- + unsigned int break_lock;
- +#endif
- +#ifdef CONFIG_DEBUG_SPINLOCK
- + unsigned int magic, owner_cpu;
- + void *owner;
- +#endif
- +#ifdef CONFIG_DEBUG_LOCK_ALLOC
- + struct lockdep_map dep_map;
- +#endif
- +} raw_spinlock_t;
- +
- +#define SPINLOCK_MAGIC 0xdead4ead
- +
- +#define SPINLOCK_OWNER_INIT ((void *)-1L)
- +
- +#ifdef CONFIG_DEBUG_LOCK_ALLOC
- +# define SPIN_DEP_MAP_INIT(lockname) .dep_map = { .name = #lockname }
- +#else
- +# define SPIN_DEP_MAP_INIT(lockname)
- +#endif
- +
- +#ifdef CONFIG_DEBUG_SPINLOCK
- +# define SPIN_DEBUG_INIT(lockname) \
- + .magic = SPINLOCK_MAGIC, \
- + .owner_cpu = -1, \
- + .owner = SPINLOCK_OWNER_INIT,
- +#else
- +# define SPIN_DEBUG_INIT(lockname)
- +#endif
- +
- +#define __RAW_SPIN_LOCK_INITIALIZER(lockname) \
- + { \
- + .raw_lock = __ARCH_SPIN_LOCK_UNLOCKED, \
- + SPIN_DEBUG_INIT(lockname) \
- + SPIN_DEP_MAP_INIT(lockname) }
- +
- +#define __RAW_SPIN_LOCK_UNLOCKED(lockname) \
- + (raw_spinlock_t) __RAW_SPIN_LOCK_INITIALIZER(lockname)
- +
- +#define DEFINE_RAW_SPINLOCK(x) raw_spinlock_t x = __RAW_SPIN_LOCK_UNLOCKED(x)
- +
- +#endif
- diff -Nur linux-4.1.39.orig/include/linux/spinlock_types_rt.h linux-4.1.39/include/linux/spinlock_types_rt.h
- --- linux-4.1.39.orig/include/linux/spinlock_types_rt.h 1970-01-01 01:00:00.000000000 +0100
- +++ linux-4.1.39/include/linux/spinlock_types_rt.h 2017-04-18 17:56:30.613397130 +0200
- @@ -0,0 +1,51 @@
- +#ifndef __LINUX_SPINLOCK_TYPES_RT_H
- +#define __LINUX_SPINLOCK_TYPES_RT_H
- +
- +#ifndef __LINUX_SPINLOCK_TYPES_H
- +#error "Do not include directly. Include spinlock_types.h instead"
- +#endif
- +
- +#include <linux/cache.h>
- +
- +/*
- + * PREEMPT_RT: spinlocks - an RT mutex plus lock-break field:
- + */
- +typedef struct spinlock {
- + struct rt_mutex lock;
- + unsigned int break_lock;
- +#ifdef CONFIG_DEBUG_LOCK_ALLOC
- + struct lockdep_map dep_map;
- +#endif
- +} spinlock_t;
- +
- +#ifdef CONFIG_DEBUG_RT_MUTEXES
- +# define __RT_SPIN_INITIALIZER(name) \
- + { \
- + .wait_lock = __RAW_SPIN_LOCK_UNLOCKED(name.wait_lock), \
- + .save_state = 1, \
- + .file = __FILE__, \
- + .line = __LINE__ , \
- + }
- +#else
- +# define __RT_SPIN_INITIALIZER(name) \
- + { \
- + .wait_lock = __RAW_SPIN_LOCK_UNLOCKED(name.wait_lock), \
- + .save_state = 1, \
- + }
- +#endif
- +
- +/*
- +.wait_list = PLIST_HEAD_INIT_RAW((name).lock.wait_list, (name).lock.wait_lock)
- +*/
- +
- +#define __SPIN_LOCK_UNLOCKED(name) \
- + { .lock = __RT_SPIN_INITIALIZER(name.lock), \
- + SPIN_DEP_MAP_INIT(name) }
- +
- +#define __DEFINE_SPINLOCK(name) \
- + spinlock_t name = __SPIN_LOCK_UNLOCKED(name)
- +
- +#define DEFINE_SPINLOCK(name) \
- + spinlock_t name __cacheline_aligned_in_smp = __SPIN_LOCK_UNLOCKED(name)
- +
- +#endif
- diff -Nur linux-4.1.39.orig/include/linux/srcu.h linux-4.1.39/include/linux/srcu.h
- --- linux-4.1.39.orig/include/linux/srcu.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/srcu.h 2017-04-18 17:56:30.613397130 +0200
- @@ -84,10 +84,10 @@
-
- void process_srcu(struct work_struct *work);
-
- -#define __SRCU_STRUCT_INIT(name) \
- +#define __SRCU_STRUCT_INIT(name, pcpu_name) \
- { \
- .completed = -300, \
- - .per_cpu_ref = &name##_srcu_array, \
- + .per_cpu_ref = &pcpu_name, \
- .queue_lock = __SPIN_LOCK_UNLOCKED(name.queue_lock), \
- .running = false, \
- .batch_queue = RCU_BATCH_INIT(name.batch_queue), \
- @@ -104,7 +104,7 @@
- */
- #define __DEFINE_SRCU(name, is_static) \
- static DEFINE_PER_CPU(struct srcu_struct_array, name##_srcu_array);\
- - is_static struct srcu_struct name = __SRCU_STRUCT_INIT(name)
- + is_static struct srcu_struct name = __SRCU_STRUCT_INIT(name, name##_srcu_array)
- #define DEFINE_SRCU(name) __DEFINE_SRCU(name, /* not static */)
- #define DEFINE_STATIC_SRCU(name) __DEFINE_SRCU(name, static)
-
- diff -Nur linux-4.1.39.orig/include/linux/swap.h linux-4.1.39/include/linux/swap.h
- --- linux-4.1.39.orig/include/linux/swap.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/swap.h 2017-04-18 17:56:30.613397130 +0200
- @@ -11,6 +11,7 @@
- #include <linux/fs.h>
- #include <linux/atomic.h>
- #include <linux/page-flags.h>
- +#include <linux/locallock.h>
- #include <asm/page.h>
-
- struct notifier_block;
- @@ -252,7 +253,8 @@
- void *workingset_eviction(struct address_space *mapping, struct page *page);
- bool workingset_refault(void *shadow);
- void workingset_activation(struct page *page);
- -extern struct list_lru workingset_shadow_nodes;
- +extern struct list_lru __workingset_shadow_nodes;
- +DECLARE_LOCAL_IRQ_LOCK(workingset_shadow_lock);
-
- static inline unsigned int workingset_node_pages(struct radix_tree_node *node)
- {
- @@ -296,6 +298,7 @@
-
-
- /* linux/mm/swap.c */
- +DECLARE_LOCAL_IRQ_LOCK(swapvec_lock);
- extern void lru_cache_add(struct page *);
- extern void lru_cache_add_anon(struct page *page);
- extern void lru_cache_add_file(struct page *page);
- diff -Nur linux-4.1.39.orig/include/linux/thread_info.h linux-4.1.39/include/linux/thread_info.h
- --- linux-4.1.39.orig/include/linux/thread_info.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/thread_info.h 2017-04-18 17:56:30.613397130 +0200
- @@ -102,7 +102,17 @@
- #define test_thread_flag(flag) \
- test_ti_thread_flag(current_thread_info(), flag)
-
- -#define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED)
- +#ifdef CONFIG_PREEMPT_LAZY
- +#define tif_need_resched() (test_thread_flag(TIF_NEED_RESCHED) || \
- + test_thread_flag(TIF_NEED_RESCHED_LAZY))
- +#define tif_need_resched_now() (test_thread_flag(TIF_NEED_RESCHED))
- +#define tif_need_resched_lazy() test_thread_flag(TIF_NEED_RESCHED_LAZY))
- +
- +#else
- +#define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED)
- +#define tif_need_resched_now() test_thread_flag(TIF_NEED_RESCHED)
- +#define tif_need_resched_lazy() 0
- +#endif
-
- #if defined TIF_RESTORE_SIGMASK && !defined HAVE_SET_RESTORE_SIGMASK
- /*
- diff -Nur linux-4.1.39.orig/include/linux/timer.h linux-4.1.39/include/linux/timer.h
- --- linux-4.1.39.orig/include/linux/timer.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/timer.h 2017-04-18 17:56:30.613397130 +0200
- @@ -241,7 +241,7 @@
-
- extern int try_to_del_timer_sync(struct timer_list *timer);
-
- -#ifdef CONFIG_SMP
- +#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_RT_FULL)
- extern int del_timer_sync(struct timer_list *timer);
- #else
- # define del_timer_sync(t) del_timer(t)
- diff -Nur linux-4.1.39.orig/include/linux/uaccess.h linux-4.1.39/include/linux/uaccess.h
- --- linux-4.1.39.orig/include/linux/uaccess.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/uaccess.h 2017-04-18 17:56:30.613397130 +0200
- @@ -1,21 +1,31 @@
- #ifndef __LINUX_UACCESS_H__
- #define __LINUX_UACCESS_H__
-
- -#include <linux/preempt.h>
- +#include <linux/sched.h>
- #include <asm/uaccess.h>
-
- +static __always_inline void pagefault_disabled_inc(void)
- +{
- + current->pagefault_disabled++;
- +}
- +
- +static __always_inline void pagefault_disabled_dec(void)
- +{
- + current->pagefault_disabled--;
- + WARN_ON(current->pagefault_disabled < 0);
- +}
- +
- /*
- - * These routines enable/disable the pagefault handler in that
- - * it will not take any locks and go straight to the fixup table.
- + * These routines enable/disable the pagefault handler. If disabled, it will
- + * not take any locks and go straight to the fixup table.
- *
- - * They have great resemblance to the preempt_disable/enable calls
- - * and in fact they are identical; this is because currently there is
- - * no other way to make the pagefault handlers do this. So we do
- - * disable preemption but we don't necessarily care about that.
- + * User access methods will not sleep when called from a pagefault_disabled()
- + * environment.
- */
- static inline void pagefault_disable(void)
- {
- - preempt_count_inc();
- + migrate_disable();
- + pagefault_disabled_inc();
- /*
- * make sure to have issued the store before a pagefault
- * can hit.
- @@ -25,18 +35,32 @@
-
- static inline void pagefault_enable(void)
- {
- -#ifndef CONFIG_PREEMPT
- /*
- * make sure to issue those last loads/stores before enabling
- * the pagefault handler again.
- */
- barrier();
- - preempt_count_dec();
- -#else
- - preempt_enable();
- -#endif
- + pagefault_disabled_dec();
- + migrate_enable();
- }
-
- +/*
- + * Is the pagefault handler disabled? If so, user access methods will not sleep.
- + */
- +#define pagefault_disabled() (current->pagefault_disabled != 0)
- +
- +/*
- + * The pagefault handler is in general disabled by pagefault_disable() or
- + * when in irq context (via in_atomic()).
- + *
- + * This function should only be used by the fault handlers. Other users should
- + * stick to pagefault_disabled().
- + * Please NEVER use preempt_disable() to disable the fault handler. With
- + * !CONFIG_PREEMPT_COUNT, this is like a NOP. So the handler won't be disabled.
- + * in_atomic() will report different values based on !CONFIG_PREEMPT_COUNT.
- + */
- +#define faulthandler_disabled() (pagefault_disabled() || in_atomic())
- +
- #ifndef ARCH_HAS_NOCACHE_UACCESS
-
- static inline unsigned long __copy_from_user_inatomic_nocache(void *to,
- diff -Nur linux-4.1.39.orig/include/linux/uprobes.h linux-4.1.39/include/linux/uprobes.h
- --- linux-4.1.39.orig/include/linux/uprobes.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/uprobes.h 2017-04-18 17:56:30.613397130 +0200
- @@ -27,6 +27,7 @@
- #include <linux/errno.h>
- #include <linux/rbtree.h>
- #include <linux/types.h>
- +#include <linux/wait.h>
-
- struct vm_area_struct;
- struct mm_struct;
- diff -Nur linux-4.1.39.orig/include/linux/vmstat.h linux-4.1.39/include/linux/vmstat.h
- --- linux-4.1.39.orig/include/linux/vmstat.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/vmstat.h 2017-04-18 17:56:30.613397130 +0200
- @@ -33,7 +33,9 @@
- */
- static inline void __count_vm_event(enum vm_event_item item)
- {
- + preempt_disable_rt();
- raw_cpu_inc(vm_event_states.event[item]);
- + preempt_enable_rt();
- }
-
- static inline void count_vm_event(enum vm_event_item item)
- @@ -43,7 +45,9 @@
-
- static inline void __count_vm_events(enum vm_event_item item, long delta)
- {
- + preempt_disable_rt();
- raw_cpu_add(vm_event_states.event[item], delta);
- + preempt_enable_rt();
- }
-
- static inline void count_vm_events(enum vm_event_item item, long delta)
- diff -Nur linux-4.1.39.orig/include/linux/wait.h linux-4.1.39/include/linux/wait.h
- --- linux-4.1.39.orig/include/linux/wait.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/linux/wait.h 2017-04-18 17:56:30.613397130 +0200
- @@ -8,6 +8,7 @@
- #include <linux/spinlock.h>
- #include <asm/current.h>
- #include <uapi/linux/wait.h>
- +#include <linux/atomic.h>
-
- typedef struct __wait_queue wait_queue_t;
- typedef int (*wait_queue_func_t)(wait_queue_t *wait, unsigned mode, int flags, void *key);
- diff -Nur linux-4.1.39.orig/include/linux/wait-simple.h linux-4.1.39/include/linux/wait-simple.h
- --- linux-4.1.39.orig/include/linux/wait-simple.h 1970-01-01 01:00:00.000000000 +0100
- +++ linux-4.1.39/include/linux/wait-simple.h 2017-04-18 17:56:30.613397130 +0200
- @@ -0,0 +1,207 @@
- +#ifndef _LINUX_WAIT_SIMPLE_H
- +#define _LINUX_WAIT_SIMPLE_H
- +
- +#include <linux/spinlock.h>
- +#include <linux/list.h>
- +
- +#include <asm/current.h>
- +
- +struct swaiter {
- + struct task_struct *task;
- + struct list_head node;
- +};
- +
- +#define DEFINE_SWAITER(name) \
- + struct swaiter name = { \
- + .task = current, \
- + .node = LIST_HEAD_INIT((name).node), \
- + }
- +
- +struct swait_head {
- + raw_spinlock_t lock;
- + struct list_head list;
- +};
- +
- +#define SWAIT_HEAD_INITIALIZER(name) { \
- + .lock = __RAW_SPIN_LOCK_UNLOCKED(name.lock), \
- + .list = LIST_HEAD_INIT((name).list), \
- + }
- +
- +#define DEFINE_SWAIT_HEAD(name) \
- + struct swait_head name = SWAIT_HEAD_INITIALIZER(name)
- +
- +extern void __init_swait_head(struct swait_head *h, struct lock_class_key *key);
- +
- +#define init_swait_head(swh) \
- + do { \
- + static struct lock_class_key __key; \
- + \
- + __init_swait_head((swh), &__key); \
- + } while (0)
- +
- +/*
- + * Waiter functions
- + */
- +extern void swait_prepare_locked(struct swait_head *head, struct swaiter *w);
- +extern void swait_prepare(struct swait_head *head, struct swaiter *w, int state);
- +extern void swait_finish_locked(struct swait_head *head, struct swaiter *w);
- +extern void swait_finish(struct swait_head *head, struct swaiter *w);
- +
- +/* Check whether a head has waiters enqueued */
- +static inline bool swaitqueue_active(struct swait_head *h)
- +{
- + /* Make sure the condition is visible before checking list_empty() */
- + smp_mb();
- + return !list_empty(&h->list);
- +}
- +
- +/*
- + * Wakeup functions
- + */
- +extern unsigned int __swait_wake(struct swait_head *head, unsigned int state, unsigned int num);
- +extern unsigned int __swait_wake_locked(struct swait_head *head, unsigned int state, unsigned int num);
- +
- +#define swait_wake(head) __swait_wake(head, TASK_NORMAL, 1)
- +#define swait_wake_interruptible(head) __swait_wake(head, TASK_INTERRUPTIBLE, 1)
- +#define swait_wake_all(head) __swait_wake(head, TASK_NORMAL, 0)
- +#define swait_wake_all_interruptible(head) __swait_wake(head, TASK_INTERRUPTIBLE, 0)
- +
- +/*
- + * Event API
- + */
- +#define __swait_event(wq, condition) \
- +do { \
- + DEFINE_SWAITER(__wait); \
- + \
- + for (;;) { \
- + swait_prepare(&wq, &__wait, TASK_UNINTERRUPTIBLE); \
- + if (condition) \
- + break; \
- + schedule(); \
- + } \
- + swait_finish(&wq, &__wait); \
- +} while (0)
- +
- +/**
- + * swait_event - sleep until a condition gets true
- + * @wq: the waitqueue to wait on
- + * @condition: a C expression for the event to wait for
- + *
- + * The process is put to sleep (TASK_UNINTERRUPTIBLE) until the
- + * @condition evaluates to true. The @condition is checked each time
- + * the waitqueue @wq is woken up.
- + *
- + * wake_up() has to be called after changing any variable that could
- + * change the result of the wait condition.
- + */
- +#define swait_event(wq, condition) \
- +do { \
- + if (condition) \
- + break; \
- + __swait_event(wq, condition); \
- +} while (0)
- +
- +#define __swait_event_interruptible(wq, condition, ret) \
- +do { \
- + DEFINE_SWAITER(__wait); \
- + \
- + for (;;) { \
- + swait_prepare(&wq, &__wait, TASK_INTERRUPTIBLE); \
- + if (condition) \
- + break; \
- + if (signal_pending(current)) { \
- + ret = -ERESTARTSYS; \
- + break; \
- + } \
- + schedule(); \
- + } \
- + swait_finish(&wq, &__wait); \
- +} while (0)
- +
- +#define __swait_event_interruptible_timeout(wq, condition, ret) \
- +do { \
- + DEFINE_SWAITER(__wait); \
- + \
- + for (;;) { \
- + swait_prepare(&wq, &__wait, TASK_INTERRUPTIBLE); \
- + if (condition) \
- + break; \
- + if (signal_pending(current)) { \
- + ret = -ERESTARTSYS; \
- + break; \
- + } \
- + ret = schedule_timeout(ret); \
- + if (!ret) \
- + break; \
- + } \
- + swait_finish(&wq, &__wait); \
- +} while (0)
- +
- +/**
- + * swait_event_interruptible - sleep until a condition gets true
- + * @wq: the waitqueue to wait on
- + * @condition: a C expression for the event to wait for
- + *
- + * The process is put to sleep (TASK_INTERRUPTIBLE) until the
- + * @condition evaluates to true. The @condition is checked each time
- + * the waitqueue @wq is woken up.
- + *
- + * wake_up() has to be called after changing any variable that could
- + * change the result of the wait condition.
- + */
- +#define swait_event_interruptible(wq, condition) \
- +({ \
- + int __ret = 0; \
- + if (!(condition)) \
- + __swait_event_interruptible(wq, condition, __ret); \
- + __ret; \
- +})
- +
- +#define swait_event_interruptible_timeout(wq, condition, timeout) \
- +({ \
- + int __ret = timeout; \
- + if (!(condition)) \
- + __swait_event_interruptible_timeout(wq, condition, __ret); \
- + __ret; \
- +})
- +
- +#define __swait_event_timeout(wq, condition, ret) \
- +do { \
- + DEFINE_SWAITER(__wait); \
- + \
- + for (;;) { \
- + swait_prepare(&wq, &__wait, TASK_UNINTERRUPTIBLE); \
- + if (condition) \
- + break; \
- + ret = schedule_timeout(ret); \
- + if (!ret) \
- + break; \
- + } \
- + swait_finish(&wq, &__wait); \
- +} while (0)
- +
- +/**
- + * swait_event_timeout - sleep until a condition gets true or a timeout elapses
- + * @wq: the waitqueue to wait on
- + * @condition: a C expression for the event to wait for
- + * @timeout: timeout, in jiffies
- + *
- + * The process is put to sleep (TASK_UNINTERRUPTIBLE) until the
- + * @condition evaluates to true. The @condition is checked each time
- + * the waitqueue @wq is woken up.
- + *
- + * wake_up() has to be called after changing any variable that could
- + * change the result of the wait condition.
- + *
- + * The function returns 0 if the @timeout elapsed, and the remaining
- + * jiffies if the condition evaluated to true before the timeout elapsed.
- + */
- +#define swait_event_timeout(wq, condition, timeout) \
- +({ \
- + long __ret = timeout; \
- + if (!(condition)) \
- + __swait_event_timeout(wq, condition, __ret); \
- + __ret; \
- +})
- +
- +#endif
- diff -Nur linux-4.1.39.orig/include/linux/work-simple.h linux-4.1.39/include/linux/work-simple.h
- --- linux-4.1.39.orig/include/linux/work-simple.h 1970-01-01 01:00:00.000000000 +0100
- +++ linux-4.1.39/include/linux/work-simple.h 2017-04-18 17:56:30.613397130 +0200
- @@ -0,0 +1,24 @@
- +#ifndef _LINUX_SWORK_H
- +#define _LINUX_SWORK_H
- +
- +#include <linux/list.h>
- +
- +struct swork_event {
- + struct list_head item;
- + unsigned long flags;
- + void (*func)(struct swork_event *);
- +};
- +
- +static inline void INIT_SWORK(struct swork_event *event,
- + void (*func)(struct swork_event *))
- +{
- + event->flags = 0;
- + event->func = func;
- +}
- +
- +bool swork_queue(struct swork_event *sev);
- +
- +int swork_get(void);
- +void swork_put(void);
- +
- +#endif /* _LINUX_SWORK_H */
- diff -Nur linux-4.1.39.orig/include/net/dst.h linux-4.1.39/include/net/dst.h
- --- linux-4.1.39.orig/include/net/dst.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/net/dst.h 2017-04-18 17:56:30.613397130 +0200
- @@ -436,7 +436,7 @@
- static inline int dst_neigh_output(struct dst_entry *dst, struct neighbour *n,
- struct sk_buff *skb)
- {
- - const struct hh_cache *hh;
- + struct hh_cache *hh;
-
- if (dst->pending_confirm) {
- unsigned long now = jiffies;
- diff -Nur linux-4.1.39.orig/include/net/neighbour.h linux-4.1.39/include/net/neighbour.h
- --- linux-4.1.39.orig/include/net/neighbour.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/net/neighbour.h 2017-04-18 17:56:30.613397130 +0200
- @@ -445,7 +445,7 @@
- }
- #endif
-
- -static inline int neigh_hh_output(const struct hh_cache *hh, struct sk_buff *skb)
- +static inline int neigh_hh_output(struct hh_cache *hh, struct sk_buff *skb)
- {
- unsigned int seq;
- int hh_len;
- @@ -500,7 +500,7 @@
-
- #define NEIGH_CB(skb) ((struct neighbour_cb *)(skb)->cb)
-
- -static inline void neigh_ha_snapshot(char *dst, const struct neighbour *n,
- +static inline void neigh_ha_snapshot(char *dst, struct neighbour *n,
- const struct net_device *dev)
- {
- unsigned int seq;
- diff -Nur linux-4.1.39.orig/include/net/netns/ipv4.h linux-4.1.39/include/net/netns/ipv4.h
- --- linux-4.1.39.orig/include/net/netns/ipv4.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/net/netns/ipv4.h 2017-04-18 17:56:30.613397130 +0200
- @@ -69,6 +69,7 @@
-
- int sysctl_icmp_echo_ignore_all;
- int sysctl_icmp_echo_ignore_broadcasts;
- + int sysctl_icmp_echo_sysrq;
- int sysctl_icmp_ignore_bogus_error_responses;
- int sysctl_icmp_ratelimit;
- int sysctl_icmp_ratemask;
- diff -Nur linux-4.1.39.orig/include/trace/events/hist.h linux-4.1.39/include/trace/events/hist.h
- --- linux-4.1.39.orig/include/trace/events/hist.h 1970-01-01 01:00:00.000000000 +0100
- +++ linux-4.1.39/include/trace/events/hist.h 2017-04-18 17:56:30.613397130 +0200
- @@ -0,0 +1,74 @@
- +#undef TRACE_SYSTEM
- +#define TRACE_SYSTEM hist
- +
- +#if !defined(_TRACE_HIST_H) || defined(TRACE_HEADER_MULTI_READ)
- +#define _TRACE_HIST_H
- +
- +#include "latency_hist.h"
- +#include <linux/tracepoint.h>
- +
- +#if !defined(CONFIG_PREEMPT_OFF_HIST) && !defined(CONFIG_INTERRUPT_OFF_HIST)
- +#define trace_preemptirqsoff_hist(a, b)
- +#define trace_preemptirqsoff_hist_rcuidle(a, b)
- +#else
- +TRACE_EVENT(preemptirqsoff_hist,
- +
- + TP_PROTO(int reason, int starthist),
- +
- + TP_ARGS(reason, starthist),
- +
- + TP_STRUCT__entry(
- + __field(int, reason)
- + __field(int, starthist)
- + ),
- +
- + TP_fast_assign(
- + __entry->reason = reason;
- + __entry->starthist = starthist;
- + ),
- +
- + TP_printk("reason=%s starthist=%s", getaction(__entry->reason),
- + __entry->starthist ? "start" : "stop")
- +);
- +#endif
- +
- +#ifndef CONFIG_MISSED_TIMER_OFFSETS_HIST
- +#define trace_hrtimer_interrupt(a, b, c, d)
- +#define trace_hrtimer_interrupt_rcuidle(a, b, c, d)
- +#else
- +TRACE_EVENT(hrtimer_interrupt,
- +
- + TP_PROTO(int cpu, long long offset, struct task_struct *curr,
- + struct task_struct *task),
- +
- + TP_ARGS(cpu, offset, curr, task),
- +
- + TP_STRUCT__entry(
- + __field(int, cpu)
- + __field(long long, offset)
- + __array(char, ccomm, TASK_COMM_LEN)
- + __field(int, cprio)
- + __array(char, tcomm, TASK_COMM_LEN)
- + __field(int, tprio)
- + ),
- +
- + TP_fast_assign(
- + __entry->cpu = cpu;
- + __entry->offset = offset;
- + memcpy(__entry->ccomm, curr->comm, TASK_COMM_LEN);
- + __entry->cprio = curr->prio;
- + memcpy(__entry->tcomm, task != NULL ? task->comm : "<none>",
- + task != NULL ? TASK_COMM_LEN : 7);
- + __entry->tprio = task != NULL ? task->prio : -1;
- + ),
- +
- + TP_printk("cpu=%d offset=%lld curr=%s[%d] thread=%s[%d]",
- + __entry->cpu, __entry->offset, __entry->ccomm,
- + __entry->cprio, __entry->tcomm, __entry->tprio)
- +);
- +#endif
- +
- +#endif /* _TRACE_HIST_H */
- +
- +/* This part must be outside protection */
- +#include <trace/define_trace.h>
- diff -Nur linux-4.1.39.orig/include/trace/events/latency_hist.h linux-4.1.39/include/trace/events/latency_hist.h
- --- linux-4.1.39.orig/include/trace/events/latency_hist.h 1970-01-01 01:00:00.000000000 +0100
- +++ linux-4.1.39/include/trace/events/latency_hist.h 2017-04-18 17:56:30.613397130 +0200
- @@ -0,0 +1,29 @@
- +#ifndef _LATENCY_HIST_H
- +#define _LATENCY_HIST_H
- +
- +enum hist_action {
- + IRQS_ON,
- + PREEMPT_ON,
- + TRACE_STOP,
- + IRQS_OFF,
- + PREEMPT_OFF,
- + TRACE_START,
- +};
- +
- +static char *actions[] = {
- + "IRQS_ON",
- + "PREEMPT_ON",
- + "TRACE_STOP",
- + "IRQS_OFF",
- + "PREEMPT_OFF",
- + "TRACE_START",
- +};
- +
- +static inline char *getaction(int action)
- +{
- + if (action >= 0 && action <= sizeof(actions)/sizeof(actions[0]))
- + return actions[action];
- + return "unknown";
- +}
- +
- +#endif /* _LATENCY_HIST_H */
- diff -Nur linux-4.1.39.orig/include/trace/events/sched.h linux-4.1.39/include/trace/events/sched.h
- --- linux-4.1.39.orig/include/trace/events/sched.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/include/trace/events/sched.h 2017-04-18 17:56:30.613397130 +0200
- @@ -55,9 +55,9 @@
- */
- DECLARE_EVENT_CLASS(sched_wakeup_template,
-
- - TP_PROTO(struct task_struct *p, int success),
- + TP_PROTO(struct task_struct *p),
-
- - TP_ARGS(__perf_task(p), success),
- + TP_ARGS(__perf_task(p)),
-
- TP_STRUCT__entry(
- __array( char, comm, TASK_COMM_LEN )
- @@ -71,25 +71,37 @@
- memcpy(__entry->comm, p->comm, TASK_COMM_LEN);
- __entry->pid = p->pid;
- __entry->prio = p->prio;
- - __entry->success = success;
- + __entry->success = 1; /* rudiment, kill when possible */
- __entry->target_cpu = task_cpu(p);
- ),
-
- - TP_printk("comm=%s pid=%d prio=%d success=%d target_cpu=%03d",
- + TP_printk("comm=%s pid=%d prio=%d target_cpu=%03d",
- __entry->comm, __entry->pid, __entry->prio,
- - __entry->success, __entry->target_cpu)
- + __entry->target_cpu)
- );
-
- +/*
- + * Tracepoint called when waking a task; this tracepoint is guaranteed to be
- + * called from the waking context.
- + */
- +DEFINE_EVENT(sched_wakeup_template, sched_waking,
- + TP_PROTO(struct task_struct *p),
- + TP_ARGS(p));
- +
- +/*
- + * Tracepoint called when the task is actually woken; p->state == TASK_RUNNNG.
- + * It it not always called from the waking context.
- + */
- DEFINE_EVENT(sched_wakeup_template, sched_wakeup,
- - TP_PROTO(struct task_struct *p, int success),
- - TP_ARGS(p, success));
- + TP_PROTO(struct task_struct *p),
- + TP_ARGS(p));
-
- /*
- * Tracepoint for waking up a new task:
- */
- DEFINE_EVENT(sched_wakeup_template, sched_wakeup_new,
- - TP_PROTO(struct task_struct *p, int success),
- - TP_ARGS(p, success));
- + TP_PROTO(struct task_struct *p),
- + TP_ARGS(p));
-
- #ifdef CREATE_TRACE_POINTS
- static inline long __trace_sched_switch_state(struct task_struct *p)
- diff -Nur linux-4.1.39.orig/init/Kconfig linux-4.1.39/init/Kconfig
- --- linux-4.1.39.orig/init/Kconfig 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/init/Kconfig 2017-04-18 17:56:30.613397130 +0200
- @@ -637,7 +637,7 @@
-
- config RCU_FAST_NO_HZ
- bool "Accelerate last non-dyntick-idle CPU's grace periods"
- - depends on NO_HZ_COMMON && SMP
- + depends on NO_HZ_COMMON && SMP && !PREEMPT_RT_FULL
- default n
- help
- This option permits CPUs to enter dynticks-idle state even if
- @@ -664,7 +664,7 @@
- config RCU_BOOST
- bool "Enable RCU priority boosting"
- depends on RT_MUTEXES && PREEMPT_RCU
- - default n
- + default y if PREEMPT_RT_FULL
- help
- This option boosts the priority of preempted RCU readers that
- block the current preemptible RCU grace period for too long.
- @@ -1101,6 +1101,7 @@
- config RT_GROUP_SCHED
- bool "Group scheduling for SCHED_RR/FIFO"
- depends on CGROUP_SCHED
- + depends on !PREEMPT_RT_FULL
- default n
- help
- This feature lets you explicitly allocate real CPU bandwidth
- @@ -1688,6 +1689,7 @@
-
- config SLAB
- bool "SLAB"
- + depends on !PREEMPT_RT_FULL
- help
- The regular slab allocator that is established and known to work
- well in all environments. It organizes cache hot objects in
- @@ -1706,6 +1708,7 @@
- config SLOB
- depends on EXPERT
- bool "SLOB (Simple Allocator)"
- + depends on !PREEMPT_RT_FULL
- help
- SLOB replaces the stock allocator with a drastically simpler
- allocator. SLOB is generally more space efficient but
- @@ -1715,7 +1718,7 @@
-
- config SLUB_CPU_PARTIAL
- default y
- - depends on SLUB && SMP
- + depends on SLUB && SMP && !PREEMPT_RT_FULL
- bool "SLUB per cpu partial cache"
- help
- Per cpu partial caches accellerate objects allocation and freeing
- diff -Nur linux-4.1.39.orig/init/main.c linux-4.1.39/init/main.c
- --- linux-4.1.39.orig/init/main.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/init/main.c 2017-04-18 17:56:30.617397286 +0200
- @@ -525,6 +525,7 @@
- setup_command_line(command_line);
- setup_nr_cpu_ids();
- setup_per_cpu_areas();
- + softirq_early_init();
- smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */
-
- build_all_zonelists(NULL, NULL);
- diff -Nur linux-4.1.39.orig/init/Makefile linux-4.1.39/init/Makefile
- --- linux-4.1.39.orig/init/Makefile 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/init/Makefile 2017-04-18 17:56:30.613397130 +0200
- @@ -33,4 +33,4 @@
- include/generated/compile.h: FORCE
- @$($(quiet)chk_compile.h)
- $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkcompile_h $@ \
- - "$(UTS_MACHINE)" "$(CONFIG_SMP)" "$(CONFIG_PREEMPT)" "$(CC) $(KBUILD_CFLAGS)"
- + "$(UTS_MACHINE)" "$(CONFIG_SMP)" "$(CONFIG_PREEMPT)" "$(CONFIG_PREEMPT_RT_FULL)" "$(CC) $(KBUILD_CFLAGS)"
- diff -Nur linux-4.1.39.orig/ipc/mqueue.c linux-4.1.39/ipc/mqueue.c
- --- linux-4.1.39.orig/ipc/mqueue.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/ipc/mqueue.c 2017-04-18 17:56:30.617397286 +0200
- @@ -47,8 +47,7 @@
- #define RECV 1
-
- #define STATE_NONE 0
- -#define STATE_PENDING 1
- -#define STATE_READY 2
- +#define STATE_READY 1
-
- struct posix_msg_tree_node {
- struct rb_node rb_node;
- @@ -568,15 +567,12 @@
- wq_add(info, sr, ewp);
-
- for (;;) {
- - set_current_state(TASK_INTERRUPTIBLE);
- + __set_current_state(TASK_INTERRUPTIBLE);
-
- spin_unlock(&info->lock);
- time = schedule_hrtimeout_range_clock(timeout, 0,
- HRTIMER_MODE_ABS, CLOCK_REALTIME);
-
- - while (ewp->state == STATE_PENDING)
- - cpu_relax();
- -
- if (ewp->state == STATE_READY) {
- retval = 0;
- goto out;
- @@ -904,11 +900,15 @@
- * list of waiting receivers. A sender checks that list before adding the new
- * message into the message array. If there is a waiting receiver, then it
- * bypasses the message array and directly hands the message over to the
- - * receiver.
- - * The receiver accepts the message and returns without grabbing the queue
- - * spinlock. Therefore an intermediate STATE_PENDING state and memory barriers
- - * are necessary. The same algorithm is used for sysv semaphores, see
- - * ipc/sem.c for more details.
- + * receiver. The receiver accepts the message and returns without grabbing the
- + * queue spinlock:
- + *
- + * - Set pointer to message.
- + * - Queue the receiver task for later wakeup (without the info->lock).
- + * - Update its state to STATE_READY. Now the receiver can continue.
- + * - Wake up the process after the lock is dropped. Should the process wake up
- + * before this wakeup (due to a timeout or a signal) it will either see
- + * STATE_READY and continue or acquire the lock to check the state again.
- *
- * The same algorithm is used for senders.
- */
- @@ -916,21 +916,29 @@
- /* pipelined_send() - send a message directly to the task waiting in
- * sys_mq_timedreceive() (without inserting message into a queue).
- */
- -static inline void pipelined_send(struct mqueue_inode_info *info,
- +static inline void pipelined_send(struct wake_q_head *wake_q,
- + struct mqueue_inode_info *info,
- struct msg_msg *message,
- struct ext_wait_queue *receiver)
- {
- receiver->msg = message;
- list_del(&receiver->list);
- - receiver->state = STATE_PENDING;
- - wake_up_process(receiver->task);
- - smp_wmb();
- + wake_q_add(wake_q, receiver->task);
- + /*
- + * Rely on the implicit cmpxchg barrier from wake_q_add such
- + * that we can ensure that updating receiver->state is the last
- + * write operation: As once set, the receiver can continue,
- + * and if we don't have the reference count from the wake_q,
- + * yet, at that point we can later have a use-after-free
- + * condition and bogus wakeup.
- + */
- receiver->state = STATE_READY;
- }
-
- /* pipelined_receive() - if there is task waiting in sys_mq_timedsend()
- * gets its message and put to the queue (we have one free place for sure). */
- -static inline void pipelined_receive(struct mqueue_inode_info *info)
- +static inline void pipelined_receive(struct wake_q_head *wake_q,
- + struct mqueue_inode_info *info)
- {
- struct ext_wait_queue *sender = wq_get_first_waiter(info, SEND);
-
- @@ -941,10 +949,9 @@
- }
- if (msg_insert(sender->msg, info))
- return;
- +
- list_del(&sender->list);
- - sender->state = STATE_PENDING;
- - wake_up_process(sender->task);
- - smp_wmb();
- + wake_q_add(wake_q, sender->task);
- sender->state = STATE_READY;
- }
-
- @@ -962,6 +969,7 @@
- struct timespec ts;
- struct posix_msg_tree_node *new_leaf = NULL;
- int ret = 0;
- + WAKE_Q(wake_q);
-
- if (u_abs_timeout) {
- int res = prepare_timeout(u_abs_timeout, &expires, &ts);
- @@ -1045,7 +1053,7 @@
- } else {
- receiver = wq_get_first_waiter(info, RECV);
- if (receiver) {
- - pipelined_send(info, msg_ptr, receiver);
- + pipelined_send(&wake_q, info, msg_ptr, receiver);
- } else {
- /* adds message to the queue */
- ret = msg_insert(msg_ptr, info);
- @@ -1058,6 +1066,7 @@
- }
- out_unlock:
- spin_unlock(&info->lock);
- + wake_up_q(&wake_q);
- out_free:
- if (ret)
- free_msg(msg_ptr);
- @@ -1144,14 +1153,17 @@
- msg_ptr = wait.msg;
- }
- } else {
- + WAKE_Q(wake_q);
- +
- msg_ptr = msg_get(info);
-
- inode->i_atime = inode->i_mtime = inode->i_ctime =
- CURRENT_TIME;
-
- /* There is now free space in queue. */
- - pipelined_receive(info);
- + pipelined_receive(&wake_q, info);
- spin_unlock(&info->lock);
- + wake_up_q(&wake_q);
- ret = 0;
- }
- if (ret == 0) {
- diff -Nur linux-4.1.39.orig/ipc/msg.c linux-4.1.39/ipc/msg.c
- --- linux-4.1.39.orig/ipc/msg.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/ipc/msg.c 2017-04-18 17:56:30.617397286 +0200
- @@ -188,6 +188,12 @@
- struct msg_receiver *msr, *t;
-
- list_for_each_entry_safe(msr, t, &msq->q_receivers, r_list) {
- + /*
- + * Make sure that the wakeup doesnt preempt
- + * this CPU prematurely. (on PREEMPT_RT)
- + */
- + preempt_disable_rt();
- +
- msr->r_msg = NULL; /* initialize expunge ordering */
- wake_up_process(msr->r_tsk);
- /*
- @@ -198,6 +204,8 @@
- */
- smp_mb();
- msr->r_msg = ERR_PTR(res);
- +
- + preempt_enable_rt();
- }
- }
-
- @@ -574,6 +582,11 @@
- if (testmsg(msg, msr->r_msgtype, msr->r_mode) &&
- !security_msg_queue_msgrcv(msq, msg, msr->r_tsk,
- msr->r_msgtype, msr->r_mode)) {
- + /*
- + * Make sure that the wakeup doesnt preempt
- + * this CPU prematurely. (on PREEMPT_RT)
- + */
- + preempt_disable_rt();
-
- list_del(&msr->r_list);
- if (msr->r_maxsize < msg->m_ts) {
- @@ -595,12 +608,13 @@
- */
- smp_mb();
- msr->r_msg = msg;
- + preempt_enable_rt();
-
- return 1;
- }
- + preempt_enable_rt();
- }
- }
- -
- return 0;
- }
-
- diff -Nur linux-4.1.39.orig/ipc/sem.c linux-4.1.39/ipc/sem.c
- --- linux-4.1.39.orig/ipc/sem.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/ipc/sem.c 2017-04-18 17:56:30.617397286 +0200
- @@ -690,6 +690,13 @@
- static void wake_up_sem_queue_prepare(struct list_head *pt,
- struct sem_queue *q, int error)
- {
- +#ifdef CONFIG_PREEMPT_RT_BASE
- + struct task_struct *p = q->sleeper;
- + get_task_struct(p);
- + q->status = error;
- + wake_up_process(p);
- + put_task_struct(p);
- +#else
- if (list_empty(pt)) {
- /*
- * Hold preempt off so that we don't get preempted and have the
- @@ -701,6 +708,7 @@
- q->pid = error;
-
- list_add_tail(&q->list, pt);
- +#endif
- }
-
- /**
- @@ -714,6 +722,7 @@
- */
- static void wake_up_sem_queue_do(struct list_head *pt)
- {
- +#ifndef CONFIG_PREEMPT_RT_BASE
- struct sem_queue *q, *t;
- int did_something;
-
- @@ -726,6 +735,7 @@
- }
- if (did_something)
- preempt_enable();
- +#endif
- }
-
- static void unlink_queue(struct sem_array *sma, struct sem_queue *q)
- diff -Nur linux-4.1.39.orig/kernel/bpf/hashtab.c linux-4.1.39/kernel/bpf/hashtab.c
- --- linux-4.1.39.orig/kernel/bpf/hashtab.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/bpf/hashtab.c 2017-04-18 17:56:30.617397286 +0200
- @@ -17,7 +17,7 @@
- struct bpf_htab {
- struct bpf_map map;
- struct hlist_head *buckets;
- - spinlock_t lock;
- + raw_spinlock_t lock;
- u32 count; /* number of elements in this hashtable */
- u32 n_buckets; /* number of hash buckets */
- u32 elem_size; /* size of each element in bytes */
- @@ -82,7 +82,7 @@
- for (i = 0; i < htab->n_buckets; i++)
- INIT_HLIST_HEAD(&htab->buckets[i]);
-
- - spin_lock_init(&htab->lock);
- + raw_spin_lock_init(&htab->lock);
- htab->count = 0;
-
- htab->elem_size = sizeof(struct htab_elem) +
- @@ -230,7 +230,7 @@
- l_new->hash = htab_map_hash(l_new->key, key_size);
-
- /* bpf_map_update_elem() can be called in_irq() */
- - spin_lock_irqsave(&htab->lock, flags);
- + raw_spin_lock_irqsave(&htab->lock, flags);
-
- head = select_bucket(htab, l_new->hash);
-
- @@ -266,11 +266,11 @@
- } else {
- htab->count++;
- }
- - spin_unlock_irqrestore(&htab->lock, flags);
- + raw_spin_unlock_irqrestore(&htab->lock, flags);
-
- return 0;
- err:
- - spin_unlock_irqrestore(&htab->lock, flags);
- + raw_spin_unlock_irqrestore(&htab->lock, flags);
- kfree(l_new);
- return ret;
- }
- @@ -291,7 +291,7 @@
-
- hash = htab_map_hash(key, key_size);
-
- - spin_lock_irqsave(&htab->lock, flags);
- + raw_spin_lock_irqsave(&htab->lock, flags);
-
- head = select_bucket(htab, hash);
-
- @@ -304,7 +304,7 @@
- ret = 0;
- }
-
- - spin_unlock_irqrestore(&htab->lock, flags);
- + raw_spin_unlock_irqrestore(&htab->lock, flags);
- return ret;
- }
-
- diff -Nur linux-4.1.39.orig/kernel/cgroup.c linux-4.1.39/kernel/cgroup.c
- --- linux-4.1.39.orig/kernel/cgroup.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/cgroup.c 2017-04-18 17:56:30.617397286 +0200
- @@ -4423,10 +4423,10 @@
- queue_work(cgroup_destroy_wq, &css->destroy_work);
- }
-
- -static void css_release_work_fn(struct work_struct *work)
- +static void css_release_work_fn(struct swork_event *sev)
- {
- struct cgroup_subsys_state *css =
- - container_of(work, struct cgroup_subsys_state, destroy_work);
- + container_of(sev, struct cgroup_subsys_state, destroy_swork);
- struct cgroup_subsys *ss = css->ss;
- struct cgroup *cgrp = css->cgroup;
-
- @@ -4465,8 +4465,8 @@
- struct cgroup_subsys_state *css =
- container_of(ref, struct cgroup_subsys_state, refcnt);
-
- - INIT_WORK(&css->destroy_work, css_release_work_fn);
- - queue_work(cgroup_destroy_wq, &css->destroy_work);
- + INIT_SWORK(&css->destroy_swork, css_release_work_fn);
- + swork_queue(&css->destroy_swork);
- }
-
- static void init_and_link_css(struct cgroup_subsys_state *css,
- @@ -5080,6 +5080,7 @@
- */
- cgroup_destroy_wq = alloc_workqueue("cgroup_destroy", 0, 1);
- BUG_ON(!cgroup_destroy_wq);
- + BUG_ON(swork_get());
-
- /*
- * Used to destroy pidlists and separate to serve as flush domain.
- diff -Nur linux-4.1.39.orig/kernel/cpu.c linux-4.1.39/kernel/cpu.c
- --- linux-4.1.39.orig/kernel/cpu.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/cpu.c 2017-04-18 17:56:30.617397286 +0200
- @@ -74,8 +74,8 @@
- #endif
- } cpu_hotplug = {
- .active_writer = NULL,
- - .wq = __WAIT_QUEUE_HEAD_INITIALIZER(cpu_hotplug.wq),
- .lock = __MUTEX_INITIALIZER(cpu_hotplug.lock),
- + .wq = __WAIT_QUEUE_HEAD_INITIALIZER(cpu_hotplug.wq),
- #ifdef CONFIG_DEBUG_LOCK_ALLOC
- .dep_map = {.name = "cpu_hotplug.lock" },
- #endif
- @@ -88,6 +88,289 @@
- #define cpuhp_lock_acquire() lock_map_acquire(&cpu_hotplug.dep_map)
- #define cpuhp_lock_release() lock_map_release(&cpu_hotplug.dep_map)
-
- +/**
- + * hotplug_pcp - per cpu hotplug descriptor
- + * @unplug: set when pin_current_cpu() needs to sync tasks
- + * @sync_tsk: the task that waits for tasks to finish pinned sections
- + * @refcount: counter of tasks in pinned sections
- + * @grab_lock: set when the tasks entering pinned sections should wait
- + * @synced: notifier for @sync_tsk to tell cpu_down it's finished
- + * @mutex: the mutex to make tasks wait (used when @grab_lock is true)
- + * @mutex_init: zero if the mutex hasn't been initialized yet.
- + *
- + * Although @unplug and @sync_tsk may point to the same task, the @unplug
- + * is used as a flag and still exists after @sync_tsk has exited and
- + * @sync_tsk set to NULL.
- + */
- +struct hotplug_pcp {
- + struct task_struct *unplug;
- + struct task_struct *sync_tsk;
- + int refcount;
- + int grab_lock;
- + struct completion synced;
- + struct completion unplug_wait;
- +#ifdef CONFIG_PREEMPT_RT_FULL
- + /*
- + * Note, on PREEMPT_RT, the hotplug lock must save the state of
- + * the task, otherwise the mutex will cause the task to fail
- + * to sleep when required. (Because it's called from migrate_disable())
- + *
- + * The spinlock_t on PREEMPT_RT is a mutex that saves the task's
- + * state.
- + */
- + spinlock_t lock;
- +#else
- + struct mutex mutex;
- +#endif
- + int mutex_init;
- +};
- +
- +#ifdef CONFIG_PREEMPT_RT_FULL
- +# define hotplug_lock(hp) rt_spin_lock(&(hp)->lock)
- +# define hotplug_unlock(hp) rt_spin_unlock(&(hp)->lock)
- +#else
- +# define hotplug_lock(hp) mutex_lock(&(hp)->mutex)
- +# define hotplug_unlock(hp) mutex_unlock(&(hp)->mutex)
- +#endif
- +
- +static DEFINE_PER_CPU(struct hotplug_pcp, hotplug_pcp);
- +
- +/**
- + * pin_current_cpu - Prevent the current cpu from being unplugged
- + *
- + * Lightweight version of get_online_cpus() to prevent cpu from being
- + * unplugged when code runs in a migration disabled region.
- + *
- + * Must be called with preemption disabled (preempt_count = 1)!
- + */
- +void pin_current_cpu(void)
- +{
- + struct hotplug_pcp *hp;
- + int force = 0;
- +
- +retry:
- + hp = this_cpu_ptr(&hotplug_pcp);
- +
- + if (!hp->unplug || hp->refcount || force || preempt_count() > 1 ||
- + hp->unplug == current) {
- + hp->refcount++;
- + return;
- + }
- + if (hp->grab_lock) {
- + preempt_enable();
- + hotplug_lock(hp);
- + hotplug_unlock(hp);
- + } else {
- + preempt_enable();
- + /*
- + * Try to push this task off of this CPU.
- + */
- + if (!migrate_me()) {
- + preempt_disable();
- + hp = this_cpu_ptr(&hotplug_pcp);
- + if (!hp->grab_lock) {
- + /*
- + * Just let it continue it's already pinned
- + * or about to sleep.
- + */
- + force = 1;
- + goto retry;
- + }
- + preempt_enable();
- + }
- + }
- + preempt_disable();
- + goto retry;
- +}
- +
- +/**
- + * unpin_current_cpu - Allow unplug of current cpu
- + *
- + * Must be called with preemption or interrupts disabled!
- + */
- +void unpin_current_cpu(void)
- +{
- + struct hotplug_pcp *hp = this_cpu_ptr(&hotplug_pcp);
- +
- + WARN_ON(hp->refcount <= 0);
- +
- + /* This is safe. sync_unplug_thread is pinned to this cpu */
- + if (!--hp->refcount && hp->unplug && hp->unplug != current)
- + wake_up_process(hp->unplug);
- +}
- +
- +static void wait_for_pinned_cpus(struct hotplug_pcp *hp)
- +{
- + set_current_state(TASK_UNINTERRUPTIBLE);
- + while (hp->refcount) {
- + schedule_preempt_disabled();
- + set_current_state(TASK_UNINTERRUPTIBLE);
- + }
- +}
- +
- +static int sync_unplug_thread(void *data)
- +{
- + struct hotplug_pcp *hp = data;
- +
- + wait_for_completion(&hp->unplug_wait);
- + preempt_disable();
- + hp->unplug = current;
- + wait_for_pinned_cpus(hp);
- +
- + /*
- + * This thread will synchronize the cpu_down() with threads
- + * that have pinned the CPU. When the pinned CPU count reaches
- + * zero, we inform the cpu_down code to continue to the next step.
- + */
- + set_current_state(TASK_UNINTERRUPTIBLE);
- + preempt_enable();
- + complete(&hp->synced);
- +
- + /*
- + * If all succeeds, the next step will need tasks to wait till
- + * the CPU is offline before continuing. To do this, the grab_lock
- + * is set and tasks going into pin_current_cpu() will block on the
- + * mutex. But we still need to wait for those that are already in
- + * pinned CPU sections. If the cpu_down() failed, the kthread_should_stop()
- + * will kick this thread out.
- + */
- + while (!hp->grab_lock && !kthread_should_stop()) {
- + schedule();
- + set_current_state(TASK_UNINTERRUPTIBLE);
- + }
- +
- + /* Make sure grab_lock is seen before we see a stale completion */
- + smp_mb();
- +
- + /*
- + * Now just before cpu_down() enters stop machine, we need to make
- + * sure all tasks that are in pinned CPU sections are out, and new
- + * tasks will now grab the lock, keeping them from entering pinned
- + * CPU sections.
- + */
- + if (!kthread_should_stop()) {
- + preempt_disable();
- + wait_for_pinned_cpus(hp);
- + preempt_enable();
- + complete(&hp->synced);
- + }
- +
- + set_current_state(TASK_UNINTERRUPTIBLE);
- + while (!kthread_should_stop()) {
- + schedule();
- + set_current_state(TASK_UNINTERRUPTIBLE);
- + }
- + set_current_state(TASK_RUNNING);
- +
- + /*
- + * Force this thread off this CPU as it's going down and
- + * we don't want any more work on this CPU.
- + */
- + current->flags &= ~PF_NO_SETAFFINITY;
- + set_cpus_allowed_ptr(current, cpu_present_mask);
- + migrate_me();
- + return 0;
- +}
- +
- +static void __cpu_unplug_sync(struct hotplug_pcp *hp)
- +{
- + wake_up_process(hp->sync_tsk);
- + wait_for_completion(&hp->synced);
- +}
- +
- +static void __cpu_unplug_wait(unsigned int cpu)
- +{
- + struct hotplug_pcp *hp = &per_cpu(hotplug_pcp, cpu);
- +
- + complete(&hp->unplug_wait);
- + wait_for_completion(&hp->synced);
- +}
- +
- +/*
- + * Start the sync_unplug_thread on the target cpu and wait for it to
- + * complete.
- + */
- +static int cpu_unplug_begin(unsigned int cpu)
- +{
- + struct hotplug_pcp *hp = &per_cpu(hotplug_pcp, cpu);
- + int err;
- +
- + /* Protected by cpu_hotplug.lock */
- + if (!hp->mutex_init) {
- +#ifdef CONFIG_PREEMPT_RT_FULL
- + spin_lock_init(&hp->lock);
- +#else
- + mutex_init(&hp->mutex);
- +#endif
- + hp->mutex_init = 1;
- + }
- +
- + /* Inform the scheduler to migrate tasks off this CPU */
- + tell_sched_cpu_down_begin(cpu);
- +
- + init_completion(&hp->synced);
- + init_completion(&hp->unplug_wait);
- +
- + hp->sync_tsk = kthread_create(sync_unplug_thread, hp, "sync_unplug/%d", cpu);
- + if (IS_ERR(hp->sync_tsk)) {
- + err = PTR_ERR(hp->sync_tsk);
- + hp->sync_tsk = NULL;
- + return err;
- + }
- + kthread_bind(hp->sync_tsk, cpu);
- +
- + /*
- + * Wait for tasks to get out of the pinned sections,
- + * it's still OK if new tasks enter. Some CPU notifiers will
- + * wait for tasks that are going to enter these sections and
- + * we must not have them block.
- + */
- + wake_up_process(hp->sync_tsk);
- + return 0;
- +}
- +
- +static void cpu_unplug_sync(unsigned int cpu)
- +{
- + struct hotplug_pcp *hp = &per_cpu(hotplug_pcp, cpu);
- +
- + init_completion(&hp->synced);
- + /* The completion needs to be initialzied before setting grab_lock */
- + smp_wmb();
- +
- + /* Grab the mutex before setting grab_lock */
- + hotplug_lock(hp);
- + hp->grab_lock = 1;
- +
- + /*
- + * The CPU notifiers have been completed.
- + * Wait for tasks to get out of pinned CPU sections and have new
- + * tasks block until the CPU is completely down.
- + */
- + __cpu_unplug_sync(hp);
- +
- + /* All done with the sync thread */
- + kthread_stop(hp->sync_tsk);
- + hp->sync_tsk = NULL;
- +}
- +
- +static void cpu_unplug_done(unsigned int cpu)
- +{
- + struct hotplug_pcp *hp = &per_cpu(hotplug_pcp, cpu);
- +
- + hp->unplug = NULL;
- + /* Let all tasks know cpu unplug is finished before cleaning up */
- + smp_wmb();
- +
- + if (hp->sync_tsk)
- + kthread_stop(hp->sync_tsk);
- +
- + if (hp->grab_lock) {
- + hotplug_unlock(hp);
- + /* protected by cpu_hotplug.lock */
- + hp->grab_lock = 0;
- + }
- + tell_sched_cpu_down_done(cpu);
- +}
-
- void get_online_cpus(void)
- {
- @@ -349,13 +632,15 @@
- /* Requires cpu_add_remove_lock to be held */
- static int __ref _cpu_down(unsigned int cpu, int tasks_frozen)
- {
- - int err, nr_calls = 0;
- + int mycpu, err, nr_calls = 0;
- void *hcpu = (void *)(long)cpu;
- unsigned long mod = tasks_frozen ? CPU_TASKS_FROZEN : 0;
- struct take_cpu_down_param tcd_param = {
- .mod = mod,
- .hcpu = hcpu,
- };
- + cpumask_var_t cpumask;
- + cpumask_var_t cpumask_org;
-
- if (num_online_cpus() == 1)
- return -EBUSY;
- @@ -363,7 +648,34 @@
- if (!cpu_online(cpu))
- return -EINVAL;
-
- + /* Move the downtaker off the unplug cpu */
- + if (!alloc_cpumask_var(&cpumask, GFP_KERNEL))
- + return -ENOMEM;
- + if (!alloc_cpumask_var(&cpumask_org, GFP_KERNEL)) {
- + free_cpumask_var(cpumask);
- + return -ENOMEM;
- + }
- +
- + cpumask_copy(cpumask_org, tsk_cpus_allowed(current));
- + cpumask_andnot(cpumask, cpu_online_mask, cpumask_of(cpu));
- + set_cpus_allowed_ptr(current, cpumask);
- + free_cpumask_var(cpumask);
- + migrate_disable();
- + mycpu = smp_processor_id();
- + if (mycpu == cpu) {
- + printk(KERN_ERR "Yuck! Still on unplug CPU\n!");
- + migrate_enable();
- + err = -EBUSY;
- + goto restore_cpus;
- + }
- + migrate_enable();
- +
- cpu_hotplug_begin();
- + err = cpu_unplug_begin(cpu);
- + if (err) {
- + printk("cpu_unplug_begin(%d) failed\n", cpu);
- + goto out_cancel;
- + }
-
- err = __cpu_notify(CPU_DOWN_PREPARE | mod, hcpu, -1, &nr_calls);
- if (err) {
- @@ -389,8 +701,12 @@
- #endif
- synchronize_rcu();
-
- + __cpu_unplug_wait(cpu);
- smpboot_park_threads(cpu);
-
- + /* Notifiers are done. Don't let any more tasks pin this CPU. */
- + cpu_unplug_sync(cpu);
- +
- /*
- * So now all preempt/rcu users must observe !cpu_active().
- */
- @@ -427,9 +743,14 @@
- check_for_tasks(cpu);
-
- out_release:
- + cpu_unplug_done(cpu);
- +out_cancel:
- cpu_hotplug_done();
- if (!err)
- cpu_notify_nofail(CPU_POST_DEAD | mod, hcpu);
- +restore_cpus:
- + set_cpus_allowed_ptr(current, cpumask_org);
- + free_cpumask_var(cpumask_org);
- return err;
- }
-
- diff -Nur linux-4.1.39.orig/kernel/cpuset.c linux-4.1.39/kernel/cpuset.c
- --- linux-4.1.39.orig/kernel/cpuset.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/cpuset.c 2017-04-18 17:56:30.617397286 +0200
- @@ -284,7 +284,7 @@
- */
-
- static DEFINE_MUTEX(cpuset_mutex);
- -static DEFINE_SPINLOCK(callback_lock);
- +static DEFINE_RAW_SPINLOCK(callback_lock);
-
- /*
- * CPU / memory hotplug is handled asynchronously.
- @@ -903,9 +903,9 @@
- continue;
- rcu_read_unlock();
-
- - spin_lock_irq(&callback_lock);
- + raw_spin_lock_irq(&callback_lock);
- cpumask_copy(cp->effective_cpus, new_cpus);
- - spin_unlock_irq(&callback_lock);
- + raw_spin_unlock_irq(&callback_lock);
-
- WARN_ON(!cgroup_on_dfl(cp->css.cgroup) &&
- !cpumask_equal(cp->cpus_allowed, cp->effective_cpus));
- @@ -970,9 +970,9 @@
- if (retval < 0)
- return retval;
-
- - spin_lock_irq(&callback_lock);
- + raw_spin_lock_irq(&callback_lock);
- cpumask_copy(cs->cpus_allowed, trialcs->cpus_allowed);
- - spin_unlock_irq(&callback_lock);
- + raw_spin_unlock_irq(&callback_lock);
-
- /* use trialcs->cpus_allowed as a temp variable */
- update_cpumasks_hier(cs, trialcs->cpus_allowed);
- @@ -1159,9 +1159,9 @@
- continue;
- rcu_read_unlock();
-
- - spin_lock_irq(&callback_lock);
- + raw_spin_lock_irq(&callback_lock);
- cp->effective_mems = *new_mems;
- - spin_unlock_irq(&callback_lock);
- + raw_spin_unlock_irq(&callback_lock);
-
- WARN_ON(!cgroup_on_dfl(cp->css.cgroup) &&
- !nodes_equal(cp->mems_allowed, cp->effective_mems));
- @@ -1229,9 +1229,9 @@
- if (retval < 0)
- goto done;
-
- - spin_lock_irq(&callback_lock);
- + raw_spin_lock_irq(&callback_lock);
- cs->mems_allowed = trialcs->mems_allowed;
- - spin_unlock_irq(&callback_lock);
- + raw_spin_unlock_irq(&callback_lock);
-
- /* use trialcs->mems_allowed as a temp variable */
- update_nodemasks_hier(cs, &trialcs->mems_allowed);
- @@ -1322,9 +1322,9 @@
- spread_flag_changed = ((is_spread_slab(cs) != is_spread_slab(trialcs))
- || (is_spread_page(cs) != is_spread_page(trialcs)));
-
- - spin_lock_irq(&callback_lock);
- + raw_spin_lock_irq(&callback_lock);
- cs->flags = trialcs->flags;
- - spin_unlock_irq(&callback_lock);
- + raw_spin_unlock_irq(&callback_lock);
-
- if (!cpumask_empty(trialcs->cpus_allowed) && balance_flag_changed)
- rebuild_sched_domains_locked();
- @@ -1726,7 +1726,7 @@
- cpuset_filetype_t type = seq_cft(sf)->private;
- int ret = 0;
-
- - spin_lock_irq(&callback_lock);
- + raw_spin_lock_irq(&callback_lock);
-
- switch (type) {
- case FILE_CPULIST:
- @@ -1745,7 +1745,7 @@
- ret = -EINVAL;
- }
-
- - spin_unlock_irq(&callback_lock);
- + raw_spin_unlock_irq(&callback_lock);
- return ret;
- }
-
- @@ -1962,12 +1962,12 @@
-
- cpuset_inc();
-
- - spin_lock_irq(&callback_lock);
- + raw_spin_lock_irq(&callback_lock);
- if (cgroup_on_dfl(cs->css.cgroup)) {
- cpumask_copy(cs->effective_cpus, parent->effective_cpus);
- cs->effective_mems = parent->effective_mems;
- }
- - spin_unlock_irq(&callback_lock);
- + raw_spin_unlock_irq(&callback_lock);
-
- if (!test_bit(CGRP_CPUSET_CLONE_CHILDREN, &css->cgroup->flags))
- goto out_unlock;
- @@ -1994,12 +1994,12 @@
- }
- rcu_read_unlock();
-
- - spin_lock_irq(&callback_lock);
- + raw_spin_lock_irq(&callback_lock);
- cs->mems_allowed = parent->mems_allowed;
- cs->effective_mems = parent->mems_allowed;
- cpumask_copy(cs->cpus_allowed, parent->cpus_allowed);
- cpumask_copy(cs->effective_cpus, parent->cpus_allowed);
- - spin_unlock_irq(&callback_lock);
- + raw_spin_unlock_irq(&callback_lock);
- out_unlock:
- mutex_unlock(&cpuset_mutex);
- return 0;
- @@ -2038,7 +2038,7 @@
- static void cpuset_bind(struct cgroup_subsys_state *root_css)
- {
- mutex_lock(&cpuset_mutex);
- - spin_lock_irq(&callback_lock);
- + raw_spin_lock_irq(&callback_lock);
-
- if (cgroup_on_dfl(root_css->cgroup)) {
- cpumask_copy(top_cpuset.cpus_allowed, cpu_possible_mask);
- @@ -2049,7 +2049,7 @@
- top_cpuset.mems_allowed = top_cpuset.effective_mems;
- }
-
- - spin_unlock_irq(&callback_lock);
- + raw_spin_unlock_irq(&callback_lock);
- mutex_unlock(&cpuset_mutex);
- }
-
- @@ -2149,12 +2149,12 @@
- {
- bool is_empty;
-
- - spin_lock_irq(&callback_lock);
- + raw_spin_lock_irq(&callback_lock);
- cpumask_copy(cs->cpus_allowed, new_cpus);
- cpumask_copy(cs->effective_cpus, new_cpus);
- cs->mems_allowed = *new_mems;
- cs->effective_mems = *new_mems;
- - spin_unlock_irq(&callback_lock);
- + raw_spin_unlock_irq(&callback_lock);
-
- /*
- * Don't call update_tasks_cpumask() if the cpuset becomes empty,
- @@ -2191,10 +2191,10 @@
- if (nodes_empty(*new_mems))
- *new_mems = parent_cs(cs)->effective_mems;
-
- - spin_lock_irq(&callback_lock);
- + raw_spin_lock_irq(&callback_lock);
- cpumask_copy(cs->effective_cpus, new_cpus);
- cs->effective_mems = *new_mems;
- - spin_unlock_irq(&callback_lock);
- + raw_spin_unlock_irq(&callback_lock);
-
- if (cpus_updated)
- update_tasks_cpumask(cs);
- @@ -2280,21 +2280,21 @@
-
- /* synchronize cpus_allowed to cpu_active_mask */
- if (cpus_updated) {
- - spin_lock_irq(&callback_lock);
- + raw_spin_lock_irq(&callback_lock);
- if (!on_dfl)
- cpumask_copy(top_cpuset.cpus_allowed, &new_cpus);
- cpumask_copy(top_cpuset.effective_cpus, &new_cpus);
- - spin_unlock_irq(&callback_lock);
- + raw_spin_unlock_irq(&callback_lock);
- /* we don't mess with cpumasks of tasks in top_cpuset */
- }
-
- /* synchronize mems_allowed to N_MEMORY */
- if (mems_updated) {
- - spin_lock_irq(&callback_lock);
- + raw_spin_lock_irq(&callback_lock);
- if (!on_dfl)
- top_cpuset.mems_allowed = new_mems;
- top_cpuset.effective_mems = new_mems;
- - spin_unlock_irq(&callback_lock);
- + raw_spin_unlock_irq(&callback_lock);
- update_tasks_nodemask(&top_cpuset);
- }
-
- @@ -2389,11 +2389,11 @@
- {
- unsigned long flags;
-
- - spin_lock_irqsave(&callback_lock, flags);
- + raw_spin_lock_irqsave(&callback_lock, flags);
- rcu_read_lock();
- guarantee_online_cpus(task_cs(tsk), pmask);
- rcu_read_unlock();
- - spin_unlock_irqrestore(&callback_lock, flags);
- + raw_spin_unlock_irqrestore(&callback_lock, flags);
- }
-
- void cpuset_cpus_allowed_fallback(struct task_struct *tsk)
- @@ -2441,11 +2441,11 @@
- nodemask_t mask;
- unsigned long flags;
-
- - spin_lock_irqsave(&callback_lock, flags);
- + raw_spin_lock_irqsave(&callback_lock, flags);
- rcu_read_lock();
- guarantee_online_mems(task_cs(tsk), &mask);
- rcu_read_unlock();
- - spin_unlock_irqrestore(&callback_lock, flags);
- + raw_spin_unlock_irqrestore(&callback_lock, flags);
-
- return mask;
- }
- @@ -2537,14 +2537,14 @@
- return 1;
-
- /* Not hardwall and node outside mems_allowed: scan up cpusets */
- - spin_lock_irqsave(&callback_lock, flags);
- + raw_spin_lock_irqsave(&callback_lock, flags);
-
- rcu_read_lock();
- cs = nearest_hardwall_ancestor(task_cs(current));
- allowed = node_isset(node, cs->mems_allowed);
- rcu_read_unlock();
-
- - spin_unlock_irqrestore(&callback_lock, flags);
- + raw_spin_unlock_irqrestore(&callback_lock, flags);
- return allowed;
- }
-
- diff -Nur linux-4.1.39.orig/kernel/debug/kdb/kdb_io.c linux-4.1.39/kernel/debug/kdb/kdb_io.c
- --- linux-4.1.39.orig/kernel/debug/kdb/kdb_io.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/debug/kdb/kdb_io.c 2017-04-18 17:56:30.617397286 +0200
- @@ -554,7 +554,6 @@
- int linecount;
- int colcount;
- int logging, saved_loglevel = 0;
- - int saved_trap_printk;
- int got_printf_lock = 0;
- int retlen = 0;
- int fnd, len;
- @@ -565,8 +564,6 @@
- unsigned long uninitialized_var(flags);
-
- preempt_disable();
- - saved_trap_printk = kdb_trap_printk;
- - kdb_trap_printk = 0;
-
- /* Serialize kdb_printf if multiple cpus try to write at once.
- * But if any cpu goes recursive in kdb, just print the output,
- @@ -855,7 +852,6 @@
- } else {
- __release(kdb_printf_lock);
- }
- - kdb_trap_printk = saved_trap_printk;
- preempt_enable();
- return retlen;
- }
- @@ -865,9 +861,11 @@
- va_list ap;
- int r;
-
- + kdb_trap_printk++;
- va_start(ap, fmt);
- r = vkdb_printf(KDB_MSGSRC_INTERNAL, fmt, ap);
- va_end(ap);
- + kdb_trap_printk--;
-
- return r;
- }
- diff -Nur linux-4.1.39.orig/kernel/events/core.c linux-4.1.39/kernel/events/core.c
- --- linux-4.1.39.orig/kernel/events/core.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/events/core.c 2017-04-18 17:56:30.621397441 +0200
- @@ -6948,6 +6948,7 @@
-
- hrtimer_init(&hwc->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
- hwc->hrtimer.function = perf_swevent_hrtimer;
- + hwc->hrtimer.irqsafe = 1;
-
- /*
- * Since hrtimers have a fixed rate, we can do a static freq->period
- diff -Nur linux-4.1.39.orig/kernel/exit.c linux-4.1.39/kernel/exit.c
- --- linux-4.1.39.orig/kernel/exit.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/exit.c 2017-04-18 17:56:30.621397441 +0200
- @@ -144,7 +144,7 @@
- * Do this under ->siglock, we can race with another thread
- * doing sigqueue_free() if we have SIGQUEUE_PREALLOC signals.
- */
- - flush_sigqueue(&tsk->pending);
- + flush_task_sigqueue(tsk);
- tsk->sighand = NULL;
- spin_unlock(&sighand->siglock);
-
- diff -Nur linux-4.1.39.orig/kernel/fork.c linux-4.1.39/kernel/fork.c
- --- linux-4.1.39.orig/kernel/fork.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/fork.c 2017-04-18 17:56:30.621397441 +0200
- @@ -108,7 +108,7 @@
-
- DEFINE_PER_CPU(unsigned long, process_counts) = 0;
-
- -__cacheline_aligned DEFINE_RWLOCK(tasklist_lock); /* outer */
- +DEFINE_RWLOCK(tasklist_lock); /* outer */
-
- #ifdef CONFIG_PROVE_RCU
- int lockdep_tasklist_lock_is_held(void)
- @@ -244,7 +244,9 @@
- if (atomic_dec_and_test(&sig->sigcnt))
- free_signal_struct(sig);
- }
- -
- +#ifdef CONFIG_PREEMPT_RT_BASE
- +static
- +#endif
- void __put_task_struct(struct task_struct *tsk)
- {
- WARN_ON(!tsk->exit_state);
- @@ -260,7 +262,18 @@
- if (!profile_handoff_task(tsk))
- free_task(tsk);
- }
- +#ifndef CONFIG_PREEMPT_RT_BASE
- EXPORT_SYMBOL_GPL(__put_task_struct);
- +#else
- +void __put_task_struct_cb(struct rcu_head *rhp)
- +{
- + struct task_struct *tsk = container_of(rhp, struct task_struct, put_rcu);
- +
- + __put_task_struct(tsk);
- +
- +}
- +EXPORT_SYMBOL_GPL(__put_task_struct_cb);
- +#endif
-
- void __init __weak arch_task_cache_init(void) { }
-
- @@ -374,6 +387,7 @@
- #endif
- tsk->splice_pipe = NULL;
- tsk->task_frag.page = NULL;
- + tsk->wake_q.next = NULL;
-
- account_kernel_stack(ti, 1);
-
- @@ -680,6 +694,19 @@
- }
- EXPORT_SYMBOL_GPL(__mmdrop);
-
- +#ifdef CONFIG_PREEMPT_RT_BASE
- +/*
- + * RCU callback for delayed mm drop. Not strictly rcu, but we don't
- + * want another facility to make this work.
- + */
- +void __mmdrop_delayed(struct rcu_head *rhp)
- +{
- + struct mm_struct *mm = container_of(rhp, struct mm_struct, delayed_drop);
- +
- + __mmdrop(mm);
- +}
- +#endif
- +
- /*
- * Decrement the use count and release all resources for an mm.
- */
- @@ -1214,6 +1241,9 @@
- */
- static void posix_cpu_timers_init(struct task_struct *tsk)
- {
- +#ifdef CONFIG_PREEMPT_RT_BASE
- + tsk->posix_timer_list = NULL;
- +#endif
- tsk->cputime_expires.prof_exp = 0;
- tsk->cputime_expires.virt_exp = 0;
- tsk->cputime_expires.sched_exp = 0;
- @@ -1338,6 +1368,7 @@
- spin_lock_init(&p->alloc_lock);
-
- init_sigpending(&p->pending);
- + p->sigqueue_cache = NULL;
-
- p->utime = p->stime = p->gtime = 0;
- p->utimescaled = p->stimescaled = 0;
- @@ -1345,7 +1376,8 @@
- p->prev_cputime.utime = p->prev_cputime.stime = 0;
- #endif
- #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
- - seqlock_init(&p->vtime_seqlock);
- + raw_spin_lock_init(&p->vtime_lock);
- + seqcount_init(&p->vtime_seq);
- p->vtime_snap = 0;
- p->vtime_snap_whence = VTIME_SLEEPING;
- #endif
- @@ -1396,6 +1428,9 @@
- p->hardirq_context = 0;
- p->softirq_context = 0;
- #endif
- +
- + p->pagefault_disabled = 0;
- +
- #ifdef CONFIG_LOCKDEP
- p->lockdep_depth = 0; /* no locks held yet */
- p->curr_chain_key = 0;
- diff -Nur linux-4.1.39.orig/kernel/futex.c linux-4.1.39/kernel/futex.c
- --- linux-4.1.39.orig/kernel/futex.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/futex.c 2017-04-18 17:56:30.621397441 +0200
- @@ -738,7 +738,9 @@
- * task still owns the PI-state:
- */
- if (head->next != next) {
- + raw_spin_unlock_irq(&curr->pi_lock);
- spin_unlock(&hb->lock);
- + raw_spin_lock_irq(&curr->pi_lock);
- continue;
- }
-
- @@ -1090,9 +1092,11 @@
-
- /*
- * The hash bucket lock must be held when this is called.
- - * Afterwards, the futex_q must not be accessed.
- + * Afterwards, the futex_q must not be accessed. Callers
- + * must ensure to later call wake_up_q() for the actual
- + * wakeups to occur.
- */
- -static void wake_futex(struct futex_q *q)
- +static void mark_wake_futex(struct wake_q_head *wake_q, struct futex_q *q)
- {
- struct task_struct *p = q->task;
-
- @@ -1100,14 +1104,10 @@
- return;
-
- /*
- - * We set q->lock_ptr = NULL _before_ we wake up the task. If
- - * a non-futex wake up happens on another CPU then the task
- - * might exit and p would dereference a non-existing task
- - * struct. Prevent this by holding a reference on p across the
- - * wake up.
- + * Queue the task for later wakeup for after we've released
- + * the hb->lock. wake_q_add() grabs reference to p.
- */
- - get_task_struct(p);
- -
- + wake_q_add(wake_q, p);
- __unqueue_futex(q);
- /*
- * The waiting task can free the futex_q as soon as
- @@ -1117,16 +1117,15 @@
- */
- smp_wmb();
- q->lock_ptr = NULL;
- -
- - wake_up_state(p, TASK_NORMAL);
- - put_task_struct(p);
- }
-
- -static int wake_futex_pi(u32 __user *uaddr, u32 uval, struct futex_q *this)
- +static int wake_futex_pi(u32 __user *uaddr, u32 uval, struct futex_q *this,
- + struct futex_hash_bucket *hb)
- {
- struct task_struct *new_owner;
- struct futex_pi_state *pi_state = this->pi_state;
- u32 uninitialized_var(curval), newval;
- + bool deboost;
- int ret = 0;
-
- if (!pi_state)
- @@ -1188,7 +1187,17 @@
- raw_spin_unlock_irq(&new_owner->pi_lock);
-
- raw_spin_unlock(&pi_state->pi_mutex.wait_lock);
- - rt_mutex_unlock(&pi_state->pi_mutex);
- +
- + deboost = rt_mutex_futex_unlock(&pi_state->pi_mutex);
- +
- + /*
- + * We deboost after dropping hb->lock. That prevents a double
- + * wakeup on RT.
- + */
- + spin_unlock(&hb->lock);
- +
- + if (deboost)
- + rt_mutex_adjust_prio(current);
-
- return 0;
- }
- @@ -1227,6 +1236,7 @@
- struct futex_q *this, *next;
- union futex_key key = FUTEX_KEY_INIT;
- int ret;
- + WAKE_Q(wake_q);
-
- if (!bitset)
- return -EINVAL;
- @@ -1254,13 +1264,14 @@
- if (!(this->bitset & bitset))
- continue;
-
- - wake_futex(this);
- + mark_wake_futex(&wake_q, this);
- if (++ret >= nr_wake)
- break;
- }
- }
-
- spin_unlock(&hb->lock);
- + wake_up_q(&wake_q);
- out_put_key:
- put_futex_key(&key);
- out:
- @@ -1279,6 +1290,7 @@
- struct futex_hash_bucket *hb1, *hb2;
- struct futex_q *this, *next;
- int ret, op_ret;
- + WAKE_Q(wake_q);
-
- retry:
- ret = get_futex_key(uaddr1, flags & FLAGS_SHARED, &key1, VERIFY_READ);
- @@ -1330,7 +1342,7 @@
- ret = -EINVAL;
- goto out_unlock;
- }
- - wake_futex(this);
- + mark_wake_futex(&wake_q, this);
- if (++ret >= nr_wake)
- break;
- }
- @@ -1344,7 +1356,7 @@
- ret = -EINVAL;
- goto out_unlock;
- }
- - wake_futex(this);
- + mark_wake_futex(&wake_q, this);
- if (++op_ret >= nr_wake2)
- break;
- }
- @@ -1354,6 +1366,7 @@
-
- out_unlock:
- double_unlock_hb(hb1, hb2);
- + wake_up_q(&wake_q);
- out_put_keys:
- put_futex_key(&key2);
- out_put_key1:
- @@ -1513,6 +1526,7 @@
- struct futex_pi_state *pi_state = NULL;
- struct futex_hash_bucket *hb1, *hb2;
- struct futex_q *this, *next;
- + WAKE_Q(wake_q);
-
- if (requeue_pi) {
- /*
- @@ -1689,7 +1703,7 @@
- * woken by futex_unlock_pi().
- */
- if (++task_count <= nr_wake && !requeue_pi) {
- - wake_futex(this);
- + mark_wake_futex(&wake_q, this);
- continue;
- }
-
- @@ -1715,6 +1729,16 @@
- requeue_pi_wake_futex(this, &key2, hb2);
- drop_count++;
- continue;
- + } else if (ret == -EAGAIN) {
- + /*
- + * Waiter was woken by timeout or
- + * signal and has set pi_blocked_on to
- + * PI_WAKEUP_INPROGRESS before we
- + * tried to enqueue it on the rtmutex.
- + */
- + this->pi_state = NULL;
- + free_pi_state(pi_state);
- + continue;
- } else if (ret) {
- /* -EDEADLK */
- this->pi_state = NULL;
- @@ -1729,6 +1753,7 @@
- out_unlock:
- free_pi_state(pi_state);
- double_unlock_hb(hb1, hb2);
- + wake_up_q(&wake_q);
- hb_waiters_dec(hb2);
-
- /*
- @@ -2422,13 +2447,22 @@
- */
- match = futex_top_waiter(hb, &key);
- if (match) {
- - ret = wake_futex_pi(uaddr, uval, match);
- + ret = wake_futex_pi(uaddr, uval, match, hb);
- +
- + /*
- + * In case of success wake_futex_pi dropped the hash
- + * bucket lock.
- + */
- + if (!ret)
- + goto out_putkey;
- +
- /*
- * The atomic access to the futex value generated a
- * pagefault, so retry the user-access and the wakeup:
- */
- if (ret == -EFAULT)
- goto pi_faulted;
- +
- /*
- * A unconditional UNLOCK_PI op raced against a waiter
- * setting the FUTEX_WAITERS bit. Try again.
- @@ -2438,6 +2472,11 @@
- put_futex_key(&key);
- goto retry;
- }
- +
- + /*
- + * wake_futex_pi has detected invalid state. Tell user
- + * space.
- + */
- goto out_unlock;
- }
-
- @@ -2458,6 +2497,7 @@
-
- out_unlock:
- spin_unlock(&hb->lock);
- +out_putkey:
- put_futex_key(&key);
- return ret;
-
- @@ -2568,7 +2608,7 @@
- struct hrtimer_sleeper timeout, *to = NULL;
- struct rt_mutex_waiter rt_waiter;
- struct rt_mutex *pi_mutex = NULL;
- - struct futex_hash_bucket *hb;
- + struct futex_hash_bucket *hb, *hb2;
- union futex_key key2 = FUTEX_KEY_INIT;
- struct futex_q q = futex_q_init;
- int res, ret;
- @@ -2593,10 +2633,7 @@
- * The waiter is allocated on our stack, manipulated by the requeue
- * code while we sleep on uaddr.
- */
- - debug_rt_mutex_init_waiter(&rt_waiter);
- - RB_CLEAR_NODE(&rt_waiter.pi_tree_entry);
- - RB_CLEAR_NODE(&rt_waiter.tree_entry);
- - rt_waiter.task = NULL;
- + rt_mutex_init_waiter(&rt_waiter, false);
-
- ret = get_futex_key(uaddr2, flags & FLAGS_SHARED, &key2, VERIFY_WRITE);
- if (unlikely(ret != 0))
- @@ -2627,20 +2664,55 @@
- /* Queue the futex_q, drop the hb lock, wait for wakeup. */
- futex_wait_queue_me(hb, &q, to);
-
- - spin_lock(&hb->lock);
- - ret = handle_early_requeue_pi_wakeup(hb, &q, &key2, to);
- - spin_unlock(&hb->lock);
- - if (ret)
- - goto out_put_keys;
- + /*
- + * On RT we must avoid races with requeue and trying to block
- + * on two mutexes (hb->lock and uaddr2's rtmutex) by
- + * serializing access to pi_blocked_on with pi_lock.
- + */
- + raw_spin_lock_irq(¤t->pi_lock);
- + if (current->pi_blocked_on) {
- + /*
- + * We have been requeued or are in the process of
- + * being requeued.
- + */
- + raw_spin_unlock_irq(¤t->pi_lock);
- + } else {
- + /*
- + * Setting pi_blocked_on to PI_WAKEUP_INPROGRESS
- + * prevents a concurrent requeue from moving us to the
- + * uaddr2 rtmutex. After that we can safely acquire
- + * (and possibly block on) hb->lock.
- + */
- + current->pi_blocked_on = PI_WAKEUP_INPROGRESS;
- + raw_spin_unlock_irq(¤t->pi_lock);
- +
- + spin_lock(&hb->lock);
- +
- + /*
- + * Clean up pi_blocked_on. We might leak it otherwise
- + * when we succeeded with the hb->lock in the fast
- + * path.
- + */
- + raw_spin_lock_irq(¤t->pi_lock);
- + current->pi_blocked_on = NULL;
- + raw_spin_unlock_irq(¤t->pi_lock);
- +
- + ret = handle_early_requeue_pi_wakeup(hb, &q, &key2, to);
- + spin_unlock(&hb->lock);
- + if (ret)
- + goto out_put_keys;
- + }
-
- /*
- - * In order for us to be here, we know our q.key == key2, and since
- - * we took the hb->lock above, we also know that futex_requeue() has
- - * completed and we no longer have to concern ourselves with a wakeup
- - * race with the atomic proxy lock acquisition by the requeue code. The
- - * futex_requeue dropped our key1 reference and incremented our key2
- - * reference count.
- + * In order to be here, we have either been requeued, are in
- + * the process of being requeued, or requeue successfully
- + * acquired uaddr2 on our behalf. If pi_blocked_on was
- + * non-null above, we may be racing with a requeue. Do not
- + * rely on q->lock_ptr to be hb2->lock until after blocking on
- + * hb->lock or hb2->lock. The futex_requeue dropped our key1
- + * reference and incremented our key2 reference count.
- */
- + hb2 = hash_futex(&key2);
-
- /* Check if the requeue code acquired the second futex for us. */
- if (!q.rt_waiter) {
- @@ -2649,14 +2721,15 @@
- * did a lock-steal - fix up the PI-state in that case.
- */
- if (q.pi_state && (q.pi_state->owner != current)) {
- - spin_lock(q.lock_ptr);
- + spin_lock(&hb2->lock);
- + BUG_ON(&hb2->lock != q.lock_ptr);
- ret = fixup_pi_state_owner(uaddr2, &q, current);
- /*
- * Drop the reference to the pi state which
- * the requeue_pi() code acquired for us.
- */
- free_pi_state(q.pi_state);
- - spin_unlock(q.lock_ptr);
- + spin_unlock(&hb2->lock);
- }
- } else {
- /*
- @@ -2669,7 +2742,8 @@
- ret = rt_mutex_finish_proxy_lock(pi_mutex, to, &rt_waiter);
- debug_rt_mutex_free_waiter(&rt_waiter);
-
- - spin_lock(q.lock_ptr);
- + spin_lock(&hb2->lock);
- + BUG_ON(&hb2->lock != q.lock_ptr);
- /*
- * Fixup the pi_state owner and possibly acquire the lock if we
- * haven't already.
- diff -Nur linux-4.1.39.orig/kernel/irq/handle.c linux-4.1.39/kernel/irq/handle.c
- --- linux-4.1.39.orig/kernel/irq/handle.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/irq/handle.c 2017-04-18 17:56:30.621397441 +0200
- @@ -133,6 +133,8 @@
- irqreturn_t
- handle_irq_event_percpu(struct irq_desc *desc, struct irqaction *action)
- {
- + struct pt_regs *regs = get_irq_regs();
- + u64 ip = regs ? instruction_pointer(regs) : 0;
- irqreturn_t retval = IRQ_NONE;
- unsigned int flags = 0, irq = desc->irq_data.irq;
-
- @@ -173,7 +175,11 @@
- action = action->next;
- } while (action);
-
- - add_interrupt_randomness(irq, flags);
- +#ifndef CONFIG_PREEMPT_RT_FULL
- + add_interrupt_randomness(irq, flags, ip);
- +#else
- + desc->random_ip = ip;
- +#endif
-
- if (!noirqdebug)
- note_interrupt(irq, desc, retval);
- diff -Nur linux-4.1.39.orig/kernel/irq/manage.c linux-4.1.39/kernel/irq/manage.c
- --- linux-4.1.39.orig/kernel/irq/manage.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/irq/manage.c 2017-04-18 17:56:30.621397441 +0200
- @@ -22,6 +22,7 @@
- #include "internals.h"
-
- #ifdef CONFIG_IRQ_FORCED_THREADING
- +# ifndef CONFIG_PREEMPT_RT_BASE
- __read_mostly bool force_irqthreads;
-
- static int __init setup_forced_irqthreads(char *arg)
- @@ -30,6 +31,7 @@
- return 0;
- }
- early_param("threadirqs", setup_forced_irqthreads);
- +# endif
- #endif
-
- static void __synchronize_hardirq(struct irq_desc *desc)
- @@ -179,6 +181,62 @@
- irq_get_pending(struct cpumask *mask, struct irq_desc *desc) { }
- #endif
-
- +#ifdef CONFIG_PREEMPT_RT_FULL
- +static void _irq_affinity_notify(struct irq_affinity_notify *notify);
- +static struct task_struct *set_affinity_helper;
- +static LIST_HEAD(affinity_list);
- +static DEFINE_RAW_SPINLOCK(affinity_list_lock);
- +
- +static int set_affinity_thread(void *unused)
- +{
- + while (1) {
- + struct irq_affinity_notify *notify;
- + int empty;
- +
- + set_current_state(TASK_INTERRUPTIBLE);
- +
- + raw_spin_lock_irq(&affinity_list_lock);
- + empty = list_empty(&affinity_list);
- + raw_spin_unlock_irq(&affinity_list_lock);
- +
- + if (empty)
- + schedule();
- + if (kthread_should_stop())
- + break;
- + set_current_state(TASK_RUNNING);
- +try_next:
- + notify = NULL;
- +
- + raw_spin_lock_irq(&affinity_list_lock);
- + if (!list_empty(&affinity_list)) {
- + notify = list_first_entry(&affinity_list,
- + struct irq_affinity_notify, list);
- + list_del_init(¬ify->list);
- + }
- + raw_spin_unlock_irq(&affinity_list_lock);
- +
- + if (!notify)
- + continue;
- + _irq_affinity_notify(notify);
- + goto try_next;
- + }
- + return 0;
- +}
- +
- +static void init_helper_thread(void)
- +{
- + if (set_affinity_helper)
- + return;
- + set_affinity_helper = kthread_run(set_affinity_thread, NULL,
- + "affinity-cb");
- + WARN_ON(IS_ERR(set_affinity_helper));
- +}
- +#else
- +
- +static inline void init_helper_thread(void) { }
- +
- +#endif
- +
- int irq_do_set_affinity(struct irq_data *data, const struct cpumask *mask,
- bool force)
- {
- @@ -218,7 +276,17 @@
-
- if (desc->affinity_notify) {
- kref_get(&desc->affinity_notify->kref);
- +
- +#ifdef CONFIG_PREEMPT_RT_FULL
- + raw_spin_lock(&affinity_list_lock);
- + if (list_empty(&desc->affinity_notify->list))
- + list_add_tail(&affinity_list,
- + &desc->affinity_notify->list);
- + raw_spin_unlock(&affinity_list_lock);
- + wake_up_process(set_affinity_helper);
- +#else
- schedule_work(&desc->affinity_notify->work);
- +#endif
- }
- irqd_set(data, IRQD_AFFINITY_SET);
-
- @@ -256,10 +324,8 @@
- }
- EXPORT_SYMBOL_GPL(irq_set_affinity_hint);
-
- -static void irq_affinity_notify(struct work_struct *work)
- +static void _irq_affinity_notify(struct irq_affinity_notify *notify)
- {
- - struct irq_affinity_notify *notify =
- - container_of(work, struct irq_affinity_notify, work);
- struct irq_desc *desc = irq_to_desc(notify->irq);
- cpumask_var_t cpumask;
- unsigned long flags;
- @@ -281,6 +347,13 @@
- kref_put(¬ify->kref, notify->release);
- }
-
- +static void irq_affinity_notify(struct work_struct *work)
- +{
- + struct irq_affinity_notify *notify =
- + container_of(work, struct irq_affinity_notify, work);
- + _irq_affinity_notify(notify);
- +}
- +
- /**
- * irq_set_affinity_notifier - control notification of IRQ affinity changes
- * @irq: Interrupt for which to enable/disable notification
- @@ -310,6 +383,8 @@
- notify->irq = irq;
- kref_init(¬ify->kref);
- INIT_WORK(¬ify->work, irq_affinity_notify);
- + INIT_LIST_HEAD(¬ify->list);
- + init_helper_thread();
- }
-
- raw_spin_lock_irqsave(&desc->lock, flags);
- @@ -697,6 +772,12 @@
- return IRQ_NONE;
- }
-
- +static irqreturn_t irq_forced_secondary_handler(int irq, void *dev_id)
- +{
- + WARN(1, "Secondary action handler called for irq %d\n", irq);
- + return IRQ_NONE;
- +}
- +
- static int irq_wait_for_interrupt(struct irqaction *action)
- {
- set_current_state(TASK_INTERRUPTIBLE);
- @@ -723,7 +804,8 @@
- static void irq_finalize_oneshot(struct irq_desc *desc,
- struct irqaction *action)
- {
- - if (!(desc->istate & IRQS_ONESHOT))
- + if (!(desc->istate & IRQS_ONESHOT) ||
- + action->handler == irq_forced_secondary_handler)
- return;
- again:
- chip_bus_lock(desc);
- @@ -825,7 +907,15 @@
- local_bh_disable();
- ret = action->thread_fn(action->irq, action->dev_id);
- irq_finalize_oneshot(desc, action);
- - local_bh_enable();
- + /*
- + * Interrupts which have real time requirements can be set up
- + * to avoid softirq processing in the thread handler. This is
- + * safe as these interrupts do not raise soft interrupts.
- + */
- + if (irq_settings_no_softirq_call(desc))
- + _local_bh_enable();
- + else
- + local_bh_enable();
- return ret;
- }
-
- @@ -877,6 +967,18 @@
- irq_finalize_oneshot(desc, action);
- }
-
- +static void irq_wake_secondary(struct irq_desc *desc, struct irqaction *action)
- +{
- + struct irqaction *secondary = action->secondary;
- +
- + if (WARN_ON_ONCE(!secondary))
- + return;
- +
- + raw_spin_lock_irq(&desc->lock);
- + __irq_wake_thread(desc, secondary);
- + raw_spin_unlock_irq(&desc->lock);
- +}
- +
- /*
- * Interrupt handler thread
- */
- @@ -907,7 +1009,15 @@
- action_ret = handler_fn(desc, action);
- if (action_ret == IRQ_HANDLED)
- atomic_inc(&desc->threads_handled);
- + if (action_ret == IRQ_WAKE_THREAD)
- + irq_wake_secondary(desc, action);
-
- +#ifdef CONFIG_PREEMPT_RT_FULL
- + migrate_disable();
- + add_interrupt_randomness(action->irq, 0,
- + desc->random_ip ^ (unsigned long) action);
- + migrate_enable();
- +#endif
- wake_threads_waitq(desc);
- }
-
- @@ -951,20 +1061,36 @@
- }
- EXPORT_SYMBOL_GPL(irq_wake_thread);
-
- -static void irq_setup_forced_threading(struct irqaction *new)
- +static int irq_setup_forced_threading(struct irqaction *new)
- {
- if (!force_irqthreads)
- - return;
- + return 0;
- if (new->flags & (IRQF_NO_THREAD | IRQF_PERCPU | IRQF_ONESHOT))
- - return;
- + return 0;
-
- new->flags |= IRQF_ONESHOT;
-
- - if (!new->thread_fn) {
- - set_bit(IRQTF_FORCED_THREAD, &new->thread_flags);
- - new->thread_fn = new->handler;
- - new->handler = irq_default_primary_handler;
- - }
- + /*
- + * Handle the case where we have a real primary handler and a
- + * thread handler. We force thread them as well by creating a
- + * secondary action.
- + */
- + if (new->handler != irq_default_primary_handler && new->thread_fn) {
- + /* Allocate the secondary action */
- + new->secondary = kzalloc(sizeof(struct irqaction), GFP_KERNEL);
- + if (!new->secondary)
- + return -ENOMEM;
- + new->secondary->handler = irq_forced_secondary_handler;
- + new->secondary->thread_fn = new->thread_fn;
- + new->secondary->dev_id = new->dev_id;
- + new->secondary->irq = new->irq;
- + new->secondary->name = new->name;
- + }
- + /* Deal with the primary handler */
- + set_bit(IRQTF_FORCED_THREAD, &new->thread_flags);
- + new->thread_fn = new->handler;
- + new->handler = irq_default_primary_handler;
- + return 0;
- }
-
- static int irq_request_resources(struct irq_desc *desc)
- @@ -984,6 +1110,48 @@
- c->irq_release_resources(d);
- }
-
- +static int
- +setup_irq_thread(struct irqaction *new, unsigned int irq, bool secondary)
- +{
- + struct task_struct *t;
- + struct sched_param param = {
- + .sched_priority = MAX_USER_RT_PRIO/2,
- + };
- +
- + if (!secondary) {
- + t = kthread_create(irq_thread, new, "irq/%d-%s", irq,
- + new->name);
- + } else {
- + t = kthread_create(irq_thread, new, "irq/%d-s-%s", irq,
- + new->name);
- + param.sched_priority += 1;
- + }
- +
- + if (IS_ERR(t))
- + return PTR_ERR(t);
- +
- + sched_setscheduler_nocheck(t, SCHED_FIFO, ¶m);
- +
- + /*
- + * We keep the reference to the task struct even if
- + * the thread dies to avoid that the interrupt code
- + * references an already freed task_struct.
- + */
- + get_task_struct(t);
- + new->thread = t;
- + /*
- + * Tell the thread to set its affinity. This is
- + * important for shared interrupt handlers as we do
- + * not invoke setup_affinity() for the secondary
- + * handlers as everything is already set up. Even for
- + * interrupts marked with IRQF_NO_BALANCE this is
- + * correct as we want the thread to move to the cpu(s)
- + * on which the requesting code placed the interrupt.
- + */
- + set_bit(IRQTF_AFFINITY, &new->thread_flags);
- + return 0;
- +}
- +
- /*
- * Internal function to register an irqaction - typically used to
- * allocate special interrupts that are part of the architecture.
- @@ -1004,6 +1172,8 @@
- if (!try_module_get(desc->owner))
- return -ENODEV;
-
- + new->irq = irq;
- +
- /*
- * Check whether the interrupt nests into another interrupt
- * thread.
- @@ -1021,8 +1191,11 @@
- */
- new->handler = irq_nested_primary_handler;
- } else {
- - if (irq_settings_can_thread(desc))
- - irq_setup_forced_threading(new);
- + if (irq_settings_can_thread(desc)) {
- + ret = irq_setup_forced_threading(new);
- + if (ret)
- + goto out_mput;
- + }
- }
-
- /*
- @@ -1031,37 +1204,14 @@
- * thread.
- */
- if (new->thread_fn && !nested) {
- - struct task_struct *t;
- - static const struct sched_param param = {
- - .sched_priority = MAX_USER_RT_PRIO/2,
- - };
- -
- - t = kthread_create(irq_thread, new, "irq/%d-%s", irq,
- - new->name);
- - if (IS_ERR(t)) {
- - ret = PTR_ERR(t);
- + ret = setup_irq_thread(new, irq, false);
- + if (ret)
- goto out_mput;
- + if (new->secondary) {
- + ret = setup_irq_thread(new->secondary, irq, true);
- + if (ret)
- + goto out_thread;
- }
- -
- - sched_setscheduler_nocheck(t, SCHED_FIFO, ¶m);
- -
- - /*
- - * We keep the reference to the task struct even if
- - * the thread dies to avoid that the interrupt code
- - * references an already freed task_struct.
- - */
- - get_task_struct(t);
- - new->thread = t;
- - /*
- - * Tell the thread to set its affinity. This is
- - * important for shared interrupt handlers as we do
- - * not invoke setup_affinity() for the secondary
- - * handlers as everything is already set up. Even for
- - * interrupts marked with IRQF_NO_BALANCE this is
- - * correct as we want the thread to move to the cpu(s)
- - * on which the requesting code placed the interrupt.
- - */
- - set_bit(IRQTF_AFFINITY, &new->thread_flags);
- }
-
- if (!alloc_cpumask_var(&mask, GFP_KERNEL)) {
- @@ -1221,6 +1371,9 @@
- irqd_set(&desc->irq_data, IRQD_NO_BALANCING);
- }
-
- + if (new->flags & IRQF_NO_SOFTIRQ_CALL)
- + irq_settings_set_no_softirq_call(desc);
- +
- /* Set default affinity mask once everything is setup */
- setup_affinity(irq, desc, mask);
-
- @@ -1234,7 +1387,6 @@
- irq, nmsk, omsk);
- }
-
- - new->irq = irq;
- *old_ptr = new;
-
- irq_pm_install_action(desc, new);
- @@ -1260,6 +1412,8 @@
- */
- if (new->thread)
- wake_up_process(new->thread);
- + if (new->secondary)
- + wake_up_process(new->secondary->thread);
-
- register_irq_proc(irq, desc);
- new->dir = NULL;
- @@ -1290,6 +1444,13 @@
- kthread_stop(t);
- put_task_struct(t);
- }
- + if (new->secondary && new->secondary->thread) {
- + struct task_struct *t = new->secondary->thread;
- +
- + new->secondary->thread = NULL;
- + kthread_stop(t);
- + put_task_struct(t);
- + }
- out_mput:
- module_put(desc->owner);
- return ret;
- @@ -1397,9 +1558,14 @@
- if (action->thread) {
- kthread_stop(action->thread);
- put_task_struct(action->thread);
- + if (action->secondary && action->secondary->thread) {
- + kthread_stop(action->secondary->thread);
- + put_task_struct(action->secondary->thread);
- + }
- }
-
- module_put(desc->owner);
- + kfree(action->secondary);
- return action;
- }
-
- @@ -1543,8 +1709,10 @@
- retval = __setup_irq(irq, desc, action);
- chip_bus_sync_unlock(desc);
-
- - if (retval)
- + if (retval) {
- + kfree(action->secondary);
- kfree(action);
- + }
-
- #ifdef CONFIG_DEBUG_SHIRQ_FIXME
- if (!retval && (irqflags & IRQF_SHARED)) {
- diff -Nur linux-4.1.39.orig/kernel/irq/settings.h linux-4.1.39/kernel/irq/settings.h
- --- linux-4.1.39.orig/kernel/irq/settings.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/irq/settings.h 2017-04-18 17:56:30.621397441 +0200
- @@ -15,6 +15,7 @@
- _IRQ_NESTED_THREAD = IRQ_NESTED_THREAD,
- _IRQ_PER_CPU_DEVID = IRQ_PER_CPU_DEVID,
- _IRQ_IS_POLLED = IRQ_IS_POLLED,
- + _IRQ_NO_SOFTIRQ_CALL = IRQ_NO_SOFTIRQ_CALL,
- _IRQF_MODIFY_MASK = IRQF_MODIFY_MASK,
- };
-
- @@ -28,6 +29,7 @@
- #define IRQ_NESTED_THREAD GOT_YOU_MORON
- #define IRQ_PER_CPU_DEVID GOT_YOU_MORON
- #define IRQ_IS_POLLED GOT_YOU_MORON
- +#define IRQ_NO_SOFTIRQ_CALL GOT_YOU_MORON
- #undef IRQF_MODIFY_MASK
- #define IRQF_MODIFY_MASK GOT_YOU_MORON
-
- @@ -38,6 +40,16 @@
- desc->status_use_accessors |= (set & _IRQF_MODIFY_MASK);
- }
-
- +static inline bool irq_settings_no_softirq_call(struct irq_desc *desc)
- +{
- + return desc->status_use_accessors & _IRQ_NO_SOFTIRQ_CALL;
- +}
- +
- +static inline void irq_settings_set_no_softirq_call(struct irq_desc *desc)
- +{
- + desc->status_use_accessors |= _IRQ_NO_SOFTIRQ_CALL;
- +}
- +
- static inline bool irq_settings_is_per_cpu(struct irq_desc *desc)
- {
- return desc->status_use_accessors & _IRQ_PER_CPU;
- diff -Nur linux-4.1.39.orig/kernel/irq/spurious.c linux-4.1.39/kernel/irq/spurious.c
- --- linux-4.1.39.orig/kernel/irq/spurious.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/irq/spurious.c 2017-04-18 17:56:30.621397441 +0200
- @@ -444,6 +444,10 @@
-
- static int __init irqfixup_setup(char *str)
- {
- +#ifdef CONFIG_PREEMPT_RT_BASE
- + pr_warn("irqfixup boot option not supported w/ CONFIG_PREEMPT_RT_BASE\n");
- + return 1;
- +#endif
- irqfixup = 1;
- printk(KERN_WARNING "Misrouted IRQ fixup support enabled.\n");
- printk(KERN_WARNING "This may impact system performance.\n");
- @@ -456,6 +460,10 @@
-
- static int __init irqpoll_setup(char *str)
- {
- +#ifdef CONFIG_PREEMPT_RT_BASE
- + pr_warn("irqpoll boot option not supported w/ CONFIG_PREEMPT_RT_BASE\n");
- + return 1;
- +#endif
- irqfixup = 2;
- printk(KERN_WARNING "Misrouted IRQ fixup and polling support "
- "enabled\n");
- diff -Nur linux-4.1.39.orig/kernel/irq_work.c linux-4.1.39/kernel/irq_work.c
- --- linux-4.1.39.orig/kernel/irq_work.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/irq_work.c 2017-04-18 17:56:30.621397441 +0200
- @@ -17,6 +17,7 @@
- #include <linux/cpu.h>
- #include <linux/notifier.h>
- #include <linux/smp.h>
- +#include <linux/interrupt.h>
- #include <asm/processor.h>
-
-
- @@ -65,6 +66,8 @@
- */
- bool irq_work_queue_on(struct irq_work *work, int cpu)
- {
- + struct llist_head *list;
- +
- /* All work should have been flushed before going offline */
- WARN_ON_ONCE(cpu_is_offline(cpu));
-
- @@ -75,7 +78,12 @@
- if (!irq_work_claim(work))
- return false;
-
- - if (llist_add(&work->llnode, &per_cpu(raised_list, cpu)))
- + if (IS_ENABLED(CONFIG_PREEMPT_RT_FULL) && !(work->flags & IRQ_WORK_HARD_IRQ))
- + list = &per_cpu(lazy_list, cpu);
- + else
- + list = &per_cpu(raised_list, cpu);
- +
- + if (llist_add(&work->llnode, list))
- arch_send_call_function_single_ipi(cpu);
-
- return true;
- @@ -86,6 +94,9 @@
- /* Enqueue the irq work @work on the current CPU */
- bool irq_work_queue(struct irq_work *work)
- {
- + struct llist_head *list;
- + bool lazy_work, realtime = IS_ENABLED(CONFIG_PREEMPT_RT_FULL);
- +
- /* Only queue if not already pending */
- if (!irq_work_claim(work))
- return false;
- @@ -93,13 +104,15 @@
- /* Queue the entry and raise the IPI if needed. */
- preempt_disable();
-
- - /* If the work is "lazy", handle it from next tick if any */
- - if (work->flags & IRQ_WORK_LAZY) {
- - if (llist_add(&work->llnode, this_cpu_ptr(&lazy_list)) &&
- - tick_nohz_tick_stopped())
- - arch_irq_work_raise();
- - } else {
- - if (llist_add(&work->llnode, this_cpu_ptr(&raised_list)))
- + lazy_work = work->flags & IRQ_WORK_LAZY;
- +
- + if (lazy_work || (realtime && !(work->flags & IRQ_WORK_HARD_IRQ)))
- + list = this_cpu_ptr(&lazy_list);
- + else
- + list = this_cpu_ptr(&raised_list);
- +
- + if (llist_add(&work->llnode, list)) {
- + if (!lazy_work || tick_nohz_tick_stopped())
- arch_irq_work_raise();
- }
-
- @@ -116,9 +129,8 @@
- raised = this_cpu_ptr(&raised_list);
- lazy = this_cpu_ptr(&lazy_list);
-
- - if (llist_empty(raised) || arch_irq_work_has_interrupt())
- - if (llist_empty(lazy))
- - return false;
- + if (llist_empty(raised) && llist_empty(lazy))
- + return false;
-
- /* All work should have been flushed before going offline */
- WARN_ON_ONCE(cpu_is_offline(smp_processor_id()));
- @@ -132,7 +144,7 @@
- struct irq_work *work;
- struct llist_node *llnode;
-
- - BUG_ON(!irqs_disabled());
- + BUG_ON_NONRT(!irqs_disabled());
-
- if (llist_empty(list))
- return;
- @@ -169,7 +181,16 @@
- void irq_work_run(void)
- {
- irq_work_run_list(this_cpu_ptr(&raised_list));
- - irq_work_run_list(this_cpu_ptr(&lazy_list));
- + if (IS_ENABLED(CONFIG_PREEMPT_RT_FULL)) {
- + /*
- + * NOTE: we raise softirq via IPI for safety,
- + * and execute in irq_work_tick() to move the
- + * overhead from hard to soft irq context.
- + */
- + if (!llist_empty(this_cpu_ptr(&lazy_list)))
- + raise_softirq(TIMER_SOFTIRQ);
- + } else
- + irq_work_run_list(this_cpu_ptr(&lazy_list));
- }
- EXPORT_SYMBOL_GPL(irq_work_run);
-
- @@ -179,8 +200,17 @@
-
- if (!llist_empty(raised) && !arch_irq_work_has_interrupt())
- irq_work_run_list(raised);
- +
- + if (!IS_ENABLED(CONFIG_PREEMPT_RT_FULL))
- + irq_work_run_list(this_cpu_ptr(&lazy_list));
- +}
- +
- +#if defined(CONFIG_IRQ_WORK) && defined(CONFIG_PREEMPT_RT_FULL)
- +void irq_work_tick_soft(void)
- +{
- irq_work_run_list(this_cpu_ptr(&lazy_list));
- }
- +#endif
-
- /*
- * Synchronize against the irq_work @entry, ensures the entry is not
- diff -Nur linux-4.1.39.orig/kernel/Kconfig.locks linux-4.1.39/kernel/Kconfig.locks
- --- linux-4.1.39.orig/kernel/Kconfig.locks 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/Kconfig.locks 2017-04-18 17:56:30.617397286 +0200
- @@ -225,11 +225,11 @@
-
- config MUTEX_SPIN_ON_OWNER
- def_bool y
- - depends on SMP && !DEBUG_MUTEXES && ARCH_SUPPORTS_ATOMIC_RMW
- + depends on SMP && !DEBUG_MUTEXES && ARCH_SUPPORTS_ATOMIC_RMW && !PREEMPT_RT_FULL
-
- config RWSEM_SPIN_ON_OWNER
- def_bool y
- - depends on SMP && RWSEM_XCHGADD_ALGORITHM && ARCH_SUPPORTS_ATOMIC_RMW
- + depends on SMP && RWSEM_XCHGADD_ALGORITHM && ARCH_SUPPORTS_ATOMIC_RMW && !PREEMPT_RT_FULL
-
- config LOCK_SPIN_ON_OWNER
- def_bool y
- diff -Nur linux-4.1.39.orig/kernel/Kconfig.preempt linux-4.1.39/kernel/Kconfig.preempt
- --- linux-4.1.39.orig/kernel/Kconfig.preempt 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/Kconfig.preempt 2017-04-18 17:56:30.617397286 +0200
- @@ -1,3 +1,16 @@
- +config PREEMPT
- + bool
- + select PREEMPT_COUNT
- +
- +config PREEMPT_RT_BASE
- + bool
- + select PREEMPT
- +
- +config HAVE_PREEMPT_LAZY
- + bool
- +
- +config PREEMPT_LAZY
- + def_bool y if HAVE_PREEMPT_LAZY && PREEMPT_RT_FULL
-
- choice
- prompt "Preemption Model"
- @@ -33,9 +46,9 @@
-
- Select this if you are building a kernel for a desktop system.
-
- -config PREEMPT
- +config PREEMPT__LL
- bool "Preemptible Kernel (Low-Latency Desktop)"
- - select PREEMPT_COUNT
- + select PREEMPT
- select UNINLINE_SPIN_UNLOCK if !ARCH_INLINE_SPIN_UNLOCK
- help
- This option reduces the latency of the kernel by making
- @@ -52,6 +65,22 @@
- embedded system with latency requirements in the milliseconds
- range.
-
- +config PREEMPT_RTB
- + bool "Preemptible Kernel (Basic RT)"
- + select PREEMPT_RT_BASE
- + help
- + This option is basically the same as (Low-Latency Desktop) but
- + enables changes which are preliminary for the full preemptible
- + RT kernel.
- +
- +config PREEMPT_RT_FULL
- + bool "Fully Preemptible Kernel (RT)"
- + depends on IRQ_FORCED_THREADING
- + select PREEMPT_RT_BASE
- + select PREEMPT_RCU
- + help
- + All and everything
- +
- endchoice
-
- config PREEMPT_COUNT
- diff -Nur linux-4.1.39.orig/kernel/ksysfs.c linux-4.1.39/kernel/ksysfs.c
- --- linux-4.1.39.orig/kernel/ksysfs.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/ksysfs.c 2017-04-18 17:56:30.621397441 +0200
- @@ -136,6 +136,15 @@
-
- #endif /* CONFIG_KEXEC */
-
- +#if defined(CONFIG_PREEMPT_RT_FULL)
- +static ssize_t realtime_show(struct kobject *kobj,
- + struct kobj_attribute *attr, char *buf)
- +{
- + return sprintf(buf, "%d\n", 1);
- +}
- +KERNEL_ATTR_RO(realtime);
- +#endif
- +
- /* whether file capabilities are enabled */
- static ssize_t fscaps_show(struct kobject *kobj,
- struct kobj_attribute *attr, char *buf)
- @@ -203,6 +212,9 @@
- &vmcoreinfo_attr.attr,
- #endif
- &rcu_expedited_attr.attr,
- +#ifdef CONFIG_PREEMPT_RT_FULL
- + &realtime_attr.attr,
- +#endif
- NULL
- };
-
- diff -Nur linux-4.1.39.orig/kernel/locking/lglock.c linux-4.1.39/kernel/locking/lglock.c
- --- linux-4.1.39.orig/kernel/locking/lglock.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/locking/lglock.c 2017-04-18 17:56:30.621397441 +0200
- @@ -4,6 +4,15 @@
- #include <linux/cpu.h>
- #include <linux/string.h>
-
- +#ifndef CONFIG_PREEMPT_RT_FULL
- +# define lg_lock_ptr arch_spinlock_t
- +# define lg_do_lock(l) arch_spin_lock(l)
- +# define lg_do_unlock(l) arch_spin_unlock(l)
- +#else
- +# define lg_lock_ptr struct rt_mutex
- +# define lg_do_lock(l) __rt_spin_lock(l)
- +# define lg_do_unlock(l) __rt_spin_unlock(l)
- +#endif
- /*
- * Note there is no uninit, so lglocks cannot be defined in
- * modules (but it's fine to use them from there)
- @@ -12,51 +21,60 @@
-
- void lg_lock_init(struct lglock *lg, char *name)
- {
- +#ifdef CONFIG_PREEMPT_RT_FULL
- + int i;
- +
- + for_each_possible_cpu(i) {
- + struct rt_mutex *lock = per_cpu_ptr(lg->lock, i);
- +
- + rt_mutex_init(lock);
- + }
- +#endif
- LOCKDEP_INIT_MAP(&lg->lock_dep_map, name, &lg->lock_key, 0);
- }
- EXPORT_SYMBOL(lg_lock_init);
-
- void lg_local_lock(struct lglock *lg)
- {
- - arch_spinlock_t *lock;
- + lg_lock_ptr *lock;
-
- - preempt_disable();
- + migrate_disable();
- lock_acquire_shared(&lg->lock_dep_map, 0, 0, NULL, _RET_IP_);
- lock = this_cpu_ptr(lg->lock);
- - arch_spin_lock(lock);
- + lg_do_lock(lock);
- }
- EXPORT_SYMBOL(lg_local_lock);
-
- void lg_local_unlock(struct lglock *lg)
- {
- - arch_spinlock_t *lock;
- + lg_lock_ptr *lock;
-
- lock_release(&lg->lock_dep_map, 1, _RET_IP_);
- lock = this_cpu_ptr(lg->lock);
- - arch_spin_unlock(lock);
- - preempt_enable();
- + lg_do_unlock(lock);
- + migrate_enable();
- }
- EXPORT_SYMBOL(lg_local_unlock);
-
- void lg_local_lock_cpu(struct lglock *lg, int cpu)
- {
- - arch_spinlock_t *lock;
- + lg_lock_ptr *lock;
-
- - preempt_disable();
- + preempt_disable_nort();
- lock_acquire_shared(&lg->lock_dep_map, 0, 0, NULL, _RET_IP_);
- lock = per_cpu_ptr(lg->lock, cpu);
- - arch_spin_lock(lock);
- + lg_do_lock(lock);
- }
- EXPORT_SYMBOL(lg_local_lock_cpu);
-
- void lg_local_unlock_cpu(struct lglock *lg, int cpu)
- {
- - arch_spinlock_t *lock;
- + lg_lock_ptr *lock;
-
- lock_release(&lg->lock_dep_map, 1, _RET_IP_);
- lock = per_cpu_ptr(lg->lock, cpu);
- - arch_spin_unlock(lock);
- - preempt_enable();
- + lg_do_unlock(lock);
- + preempt_enable_nort();
- }
- EXPORT_SYMBOL(lg_local_unlock_cpu);
-
- @@ -64,12 +82,12 @@
- {
- int i;
-
- - preempt_disable();
- + preempt_disable_nort();
- lock_acquire_exclusive(&lg->lock_dep_map, 0, 0, NULL, _RET_IP_);
- for_each_possible_cpu(i) {
- - arch_spinlock_t *lock;
- + lg_lock_ptr *lock;
- lock = per_cpu_ptr(lg->lock, i);
- - arch_spin_lock(lock);
- + lg_do_lock(lock);
- }
- }
- EXPORT_SYMBOL(lg_global_lock);
- @@ -80,10 +98,35 @@
-
- lock_release(&lg->lock_dep_map, 1, _RET_IP_);
- for_each_possible_cpu(i) {
- - arch_spinlock_t *lock;
- + lg_lock_ptr *lock;
- lock = per_cpu_ptr(lg->lock, i);
- - arch_spin_unlock(lock);
- + lg_do_unlock(lock);
- }
- - preempt_enable();
- + preempt_enable_nort();
- }
- EXPORT_SYMBOL(lg_global_unlock);
- +
- +#ifdef CONFIG_PREEMPT_RT_FULL
- +/*
- + * HACK: If you use this, you get to keep the pieces.
- + * Used in queue_stop_cpus_work() when stop machinery
- + * is called from inactive CPU, so we can't schedule.
- + */
- +# define lg_do_trylock_relax(l) \
- + do { \
- + while (!__rt_spin_trylock(l)) \
- + cpu_relax(); \
- + } while (0)
- +
- +void lg_global_trylock_relax(struct lglock *lg)
- +{
- + int i;
- +
- + lock_acquire_exclusive(&lg->lock_dep_map, 0, 0, NULL, _RET_IP_);
- + for_each_possible_cpu(i) {
- + lg_lock_ptr *lock;
- + lock = per_cpu_ptr(lg->lock, i);
- + lg_do_trylock_relax(lock);
- + }
- +}
- +#endif
- diff -Nur linux-4.1.39.orig/kernel/locking/lockdep.c linux-4.1.39/kernel/locking/lockdep.c
- --- linux-4.1.39.orig/kernel/locking/lockdep.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/locking/lockdep.c 2017-04-18 17:56:30.621397441 +0200
- @@ -668,6 +668,7 @@
- struct lockdep_subclass_key *key;
- struct list_head *hash_head;
- struct lock_class *class;
- + bool is_static = false;
-
- #ifdef CONFIG_DEBUG_LOCKDEP
- /*
- @@ -695,10 +696,23 @@
-
- /*
- * Static locks do not have their class-keys yet - for them the key
- - * is the lock object itself:
- - */
- - if (unlikely(!lock->key))
- - lock->key = (void *)lock;
- + * is the lock object itself. If the lock is in the per cpu area,
- + * the canonical address of the lock (per cpu offset removed) is
- + * used.
- + */
- + if (unlikely(!lock->key)) {
- + unsigned long can_addr, addr = (unsigned long)lock;
- +
- + if (__is_kernel_percpu_address(addr, &can_addr))
- + lock->key = (void *)can_addr;
- + else if (__is_module_percpu_address(addr, &can_addr))
- + lock->key = (void *)can_addr;
- + else if (static_obj(lock))
- + lock->key = (void *)lock;
- + else
- + return ERR_PTR(-EINVAL);
- + is_static = true;
- + }
-
- /*
- * NOTE: the class-key must be unique. For dynamic locks, a static
- @@ -730,7 +744,7 @@
- }
- }
-
- - return NULL;
- + return is_static || static_obj(lock->key) ? NULL : ERR_PTR(-EINVAL);
- }
-
- /*
- @@ -748,19 +762,18 @@
- DEBUG_LOCKS_WARN_ON(!irqs_disabled());
-
- class = look_up_lock_class(lock, subclass);
- - if (likely(class))
- + if (likely(!IS_ERR_OR_NULL(class)))
- goto out_set_class_cache;
-
- /*
- * Debug-check: all keys must be persistent!
- - */
- - if (!static_obj(lock->key)) {
- + */
- + if (IS_ERR(class)) {
- debug_locks_off();
- printk("INFO: trying to register non-static key.\n");
- printk("the code is fine but needs lockdep annotation.\n");
- printk("turning off the locking correctness validator.\n");
- dump_stack();
- -
- return NULL;
- }
-
- @@ -3297,7 +3310,7 @@
- * Clearly if the lock hasn't been acquired _ever_, we're not
- * holding it either, so report failure.
- */
- - if (!class)
- + if (IS_ERR_OR_NULL(class))
- return 0;
-
- /*
- @@ -3563,6 +3576,7 @@
- }
- }
-
- +#ifndef CONFIG_PREEMPT_RT_FULL
- /*
- * We dont accurately track softirq state in e.g.
- * hardirq contexts (such as on 4KSTACKS), so only
- @@ -3577,6 +3591,7 @@
- DEBUG_LOCKS_WARN_ON(!current->softirqs_enabled);
- }
- }
- +#endif
-
- if (!debug_locks)
- print_irqtrace_events(current);
- @@ -3980,7 +3995,7 @@
- * If the class exists we look it up and zap it:
- */
- class = look_up_lock_class(lock, j);
- - if (class)
- + if (!IS_ERR_OR_NULL(class))
- zap_class(class);
- }
- /*
- diff -Nur linux-4.1.39.orig/kernel/locking/locktorture.c linux-4.1.39/kernel/locking/locktorture.c
- --- linux-4.1.39.orig/kernel/locking/locktorture.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/locking/locktorture.c 2017-04-18 17:56:30.621397441 +0200
- @@ -24,7 +24,6 @@
- #include <linux/module.h>
- #include <linux/kthread.h>
- #include <linux/spinlock.h>
- -#include <linux/rwlock.h>
- #include <linux/mutex.h>
- #include <linux/rwsem.h>
- #include <linux/smp.h>
- diff -Nur linux-4.1.39.orig/kernel/locking/Makefile linux-4.1.39/kernel/locking/Makefile
- --- linux-4.1.39.orig/kernel/locking/Makefile 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/locking/Makefile 2017-04-18 17:56:30.621397441 +0200
- @@ -1,5 +1,5 @@
-
- -obj-y += mutex.o semaphore.o rwsem.o
- +obj-y += semaphore.o
-
- ifdef CONFIG_FUNCTION_TRACER
- CFLAGS_REMOVE_lockdep.o = $(CC_FLAGS_FTRACE)
- @@ -8,7 +8,11 @@
- CFLAGS_REMOVE_rtmutex-debug.o = $(CC_FLAGS_FTRACE)
- endif
-
- +ifneq ($(CONFIG_PREEMPT_RT_FULL),y)
- +obj-y += mutex.o
- obj-$(CONFIG_DEBUG_MUTEXES) += mutex-debug.o
- +obj-y += rwsem.o
- +endif
- obj-$(CONFIG_LOCKDEP) += lockdep.o
- ifeq ($(CONFIG_PROC_FS),y)
- obj-$(CONFIG_LOCKDEP) += lockdep_proc.o
- @@ -22,8 +26,11 @@
- obj-$(CONFIG_RT_MUTEX_TESTER) += rtmutex-tester.o
- obj-$(CONFIG_DEBUG_SPINLOCK) += spinlock.o
- obj-$(CONFIG_DEBUG_SPINLOCK) += spinlock_debug.o
- +ifneq ($(CONFIG_PREEMPT_RT_FULL),y)
- obj-$(CONFIG_RWSEM_GENERIC_SPINLOCK) += rwsem-spinlock.o
- obj-$(CONFIG_RWSEM_XCHGADD_ALGORITHM) += rwsem-xadd.o
- +endif
- obj-$(CONFIG_PERCPU_RWSEM) += percpu-rwsem.o
- +obj-$(CONFIG_PREEMPT_RT_FULL) += rt.o
- obj-$(CONFIG_QUEUE_RWLOCK) += qrwlock.o
- obj-$(CONFIG_LOCK_TORTURE_TEST) += locktorture.o
- diff -Nur linux-4.1.39.orig/kernel/locking/rt.c linux-4.1.39/kernel/locking/rt.c
- --- linux-4.1.39.orig/kernel/locking/rt.c 1970-01-01 01:00:00.000000000 +0100
- +++ linux-4.1.39/kernel/locking/rt.c 2017-04-18 17:56:30.621397441 +0200
- @@ -0,0 +1,461 @@
- +/*
- + * kernel/rt.c
- + *
- + * Real-Time Preemption Support
- + *
- + * started by Ingo Molnar:
- + *
- + * Copyright (C) 2004-2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
- + * Copyright (C) 2006, Timesys Corp., Thomas Gleixner <tglx@timesys.com>
- + *
- + * historic credit for proving that Linux spinlocks can be implemented via
- + * RT-aware mutexes goes to many people: The Pmutex project (Dirk Grambow
- + * and others) who prototyped it on 2.4 and did lots of comparative
- + * research and analysis; TimeSys, for proving that you can implement a
- + * fully preemptible kernel via the use of IRQ threading and mutexes;
- + * Bill Huey for persuasively arguing on lkml that the mutex model is the
- + * right one; and to MontaVista, who ported pmutexes to 2.6.
- + *
- + * This code is a from-scratch implementation and is not based on pmutexes,
- + * but the idea of converting spinlocks to mutexes is used here too.
- + *
- + * lock debugging, locking tree, deadlock detection:
- + *
- + * Copyright (C) 2004, LynuxWorks, Inc., Igor Manyilov, Bill Huey
- + * Released under the General Public License (GPL).
- + *
- + * Includes portions of the generic R/W semaphore implementation from:
- + *
- + * Copyright (c) 2001 David Howells (dhowells@redhat.com).
- + * - Derived partially from idea by Andrea Arcangeli <andrea@suse.de>
- + * - Derived also from comments by Linus
- + *
- + * Pending ownership of locks and ownership stealing:
- + *
- + * Copyright (C) 2005, Kihon Technologies Inc., Steven Rostedt
- + *
- + * (also by Steven Rostedt)
- + * - Converted single pi_lock to individual task locks.
- + *
- + * By Esben Nielsen:
- + * Doing priority inheritance with help of the scheduler.
- + *
- + * Copyright (C) 2006, Timesys Corp., Thomas Gleixner <tglx@timesys.com>
- + * - major rework based on Esben Nielsens initial patch
- + * - replaced thread_info references by task_struct refs
- + * - removed task->pending_owner dependency
- + * - BKL drop/reacquire for semaphore style locks to avoid deadlocks
- + * in the scheduler return path as discussed with Steven Rostedt
- + *
- + * Copyright (C) 2006, Kihon Technologies Inc.
- + * Steven Rostedt <rostedt@goodmis.org>
- + * - debugged and patched Thomas Gleixner's rework.
- + * - added back the cmpxchg to the rework.
- + * - turned atomic require back on for SMP.
- + */
- +
- +#include <linux/spinlock.h>
- +#include <linux/rtmutex.h>
- +#include <linux/sched.h>
- +#include <linux/delay.h>
- +#include <linux/module.h>
- +#include <linux/kallsyms.h>
- +#include <linux/syscalls.h>
- +#include <linux/interrupt.h>
- +#include <linux/plist.h>
- +#include <linux/fs.h>
- +#include <linux/futex.h>
- +#include <linux/hrtimer.h>
- +
- +#include "rtmutex_common.h"
- +
- +/*
- + * struct mutex functions
- + */
- +void __mutex_do_init(struct mutex *mutex, const char *name,
- + struct lock_class_key *key)
- +{
- +#ifdef CONFIG_DEBUG_LOCK_ALLOC
- + /*
- + * Make sure we are not reinitializing a held lock:
- + */
- + debug_check_no_locks_freed((void *)mutex, sizeof(*mutex));
- + lockdep_init_map(&mutex->dep_map, name, key, 0);
- +#endif
- + mutex->lock.save_state = 0;
- +}
- +EXPORT_SYMBOL(__mutex_do_init);
- +
- +void __lockfunc _mutex_lock(struct mutex *lock)
- +{
- + mutex_acquire(&lock->dep_map, 0, 0, _RET_IP_);
- + rt_mutex_lock(&lock->lock);
- +}
- +EXPORT_SYMBOL(_mutex_lock);
- +
- +int __lockfunc _mutex_lock_interruptible(struct mutex *lock)
- +{
- + int ret;
- +
- + mutex_acquire(&lock->dep_map, 0, 0, _RET_IP_);
- + ret = rt_mutex_lock_interruptible(&lock->lock);
- + if (ret)
- + mutex_release(&lock->dep_map, 1, _RET_IP_);
- + return ret;
- +}
- +EXPORT_SYMBOL(_mutex_lock_interruptible);
- +
- +int __lockfunc _mutex_lock_killable(struct mutex *lock)
- +{
- + int ret;
- +
- + mutex_acquire(&lock->dep_map, 0, 0, _RET_IP_);
- + ret = rt_mutex_lock_killable(&lock->lock);
- + if (ret)
- + mutex_release(&lock->dep_map, 1, _RET_IP_);
- + return ret;
- +}
- +EXPORT_SYMBOL(_mutex_lock_killable);
- +
- +#ifdef CONFIG_DEBUG_LOCK_ALLOC
- +void __lockfunc _mutex_lock_nested(struct mutex *lock, int subclass)
- +{
- + mutex_acquire_nest(&lock->dep_map, subclass, 0, NULL, _RET_IP_);
- + rt_mutex_lock(&lock->lock);
- +}
- +EXPORT_SYMBOL(_mutex_lock_nested);
- +
- +void __lockfunc _mutex_lock_nest_lock(struct mutex *lock, struct lockdep_map *nest)
- +{
- + mutex_acquire_nest(&lock->dep_map, 0, 0, nest, _RET_IP_);
- + rt_mutex_lock(&lock->lock);
- +}
- +EXPORT_SYMBOL(_mutex_lock_nest_lock);
- +
- +int __lockfunc _mutex_lock_interruptible_nested(struct mutex *lock, int subclass)
- +{
- + int ret;
- +
- + mutex_acquire_nest(&lock->dep_map, subclass, 0, NULL, _RET_IP_);
- + ret = rt_mutex_lock_interruptible(&lock->lock);
- + if (ret)
- + mutex_release(&lock->dep_map, 1, _RET_IP_);
- + return ret;
- +}
- +EXPORT_SYMBOL(_mutex_lock_interruptible_nested);
- +
- +int __lockfunc _mutex_lock_killable_nested(struct mutex *lock, int subclass)
- +{
- + int ret;
- +
- + mutex_acquire(&lock->dep_map, subclass, 0, _RET_IP_);
- + ret = rt_mutex_lock_killable(&lock->lock);
- + if (ret)
- + mutex_release(&lock->dep_map, 1, _RET_IP_);
- + return ret;
- +}
- +EXPORT_SYMBOL(_mutex_lock_killable_nested);
- +#endif
- +
- +int __lockfunc _mutex_trylock(struct mutex *lock)
- +{
- + int ret = rt_mutex_trylock(&lock->lock);
- +
- + if (ret)
- + mutex_acquire(&lock->dep_map, 0, 1, _RET_IP_);
- +
- + return ret;
- +}
- +EXPORT_SYMBOL(_mutex_trylock);
- +
- +void __lockfunc _mutex_unlock(struct mutex *lock)
- +{
- + mutex_release(&lock->dep_map, 1, _RET_IP_);
- + rt_mutex_unlock(&lock->lock);
- +}
- +EXPORT_SYMBOL(_mutex_unlock);
- +
- +/*
- + * rwlock_t functions
- + */
- +int __lockfunc rt_write_trylock(rwlock_t *rwlock)
- +{
- + int ret;
- +
- + migrate_disable();
- + ret = rt_mutex_trylock(&rwlock->lock);
- + if (ret)
- + rwlock_acquire(&rwlock->dep_map, 0, 1, _RET_IP_);
- + else
- + migrate_enable();
- +
- + return ret;
- +}
- +EXPORT_SYMBOL(rt_write_trylock);
- +
- +int __lockfunc rt_write_trylock_irqsave(rwlock_t *rwlock, unsigned long *flags)
- +{
- + int ret;
- +
- + *flags = 0;
- + ret = rt_write_trylock(rwlock);
- + return ret;
- +}
- +EXPORT_SYMBOL(rt_write_trylock_irqsave);
- +
- +int __lockfunc rt_read_trylock(rwlock_t *rwlock)
- +{
- + struct rt_mutex *lock = &rwlock->lock;
- + int ret = 1;
- +
- + /*
- + * recursive read locks succeed when current owns the lock,
- + * but not when read_depth == 0 which means that the lock is
- + * write locked.
- + */
- + if (rt_mutex_owner(lock) != current) {
- + migrate_disable();
- + ret = rt_mutex_trylock(lock);
- + if (ret)
- + rwlock_acquire(&rwlock->dep_map, 0, 1, _RET_IP_);
- + else
- + migrate_enable();
- +
- + } else if (!rwlock->read_depth) {
- + ret = 0;
- + }
- +
- + if (ret)
- + rwlock->read_depth++;
- +
- + return ret;
- +}
- +EXPORT_SYMBOL(rt_read_trylock);
- +
- +void __lockfunc rt_write_lock(rwlock_t *rwlock)
- +{
- + rwlock_acquire(&rwlock->dep_map, 0, 0, _RET_IP_);
- + migrate_disable();
- + __rt_spin_lock(&rwlock->lock);
- +}
- +EXPORT_SYMBOL(rt_write_lock);
- +
- +void __lockfunc rt_read_lock(rwlock_t *rwlock)
- +{
- + struct rt_mutex *lock = &rwlock->lock;
- +
- +
- + /*
- + * recursive read locks succeed when current owns the lock
- + */
- + if (rt_mutex_owner(lock) != current) {
- + migrate_disable();
- + rwlock_acquire(&rwlock->dep_map, 0, 0, _RET_IP_);
- + __rt_spin_lock(lock);
- + }
- + rwlock->read_depth++;
- +}
- +
- +EXPORT_SYMBOL(rt_read_lock);
- +
- +void __lockfunc rt_write_unlock(rwlock_t *rwlock)
- +{
- + /* NOTE: we always pass in '1' for nested, for simplicity */
- + rwlock_release(&rwlock->dep_map, 1, _RET_IP_);
- + __rt_spin_unlock(&rwlock->lock);
- + migrate_enable();
- +}
- +EXPORT_SYMBOL(rt_write_unlock);
- +
- +void __lockfunc rt_read_unlock(rwlock_t *rwlock)
- +{
- + /* Release the lock only when read_depth is down to 0 */
- + if (--rwlock->read_depth == 0) {
- + rwlock_release(&rwlock->dep_map, 1, _RET_IP_);
- + __rt_spin_unlock(&rwlock->lock);
- + migrate_enable();
- + }
- +}
- +EXPORT_SYMBOL(rt_read_unlock);
- +
- +unsigned long __lockfunc rt_write_lock_irqsave(rwlock_t *rwlock)
- +{
- + rt_write_lock(rwlock);
- +
- + return 0;
- +}
- +EXPORT_SYMBOL(rt_write_lock_irqsave);
- +
- +unsigned long __lockfunc rt_read_lock_irqsave(rwlock_t *rwlock)
- +{
- + rt_read_lock(rwlock);
- +
- + return 0;
- +}
- +EXPORT_SYMBOL(rt_read_lock_irqsave);
- +
- +void __rt_rwlock_init(rwlock_t *rwlock, char *name, struct lock_class_key *key)
- +{
- +#ifdef CONFIG_DEBUG_LOCK_ALLOC
- + /*
- + * Make sure we are not reinitializing a held lock:
- + */
- + debug_check_no_locks_freed((void *)rwlock, sizeof(*rwlock));
- + lockdep_init_map(&rwlock->dep_map, name, key, 0);
- +#endif
- + rwlock->lock.save_state = 1;
- + rwlock->read_depth = 0;
- +}
- +EXPORT_SYMBOL(__rt_rwlock_init);
- +
- +/*
- + * rw_semaphores
- + */
- +
- +void rt_up_write(struct rw_semaphore *rwsem)
- +{
- + rwsem_release(&rwsem->dep_map, 1, _RET_IP_);
- + rt_mutex_unlock(&rwsem->lock);
- +}
- +EXPORT_SYMBOL(rt_up_write);
- +
- +void __rt_up_read(struct rw_semaphore *rwsem)
- +{
- + if (--rwsem->read_depth == 0)
- + rt_mutex_unlock(&rwsem->lock);
- +}
- +
- +void rt_up_read(struct rw_semaphore *rwsem)
- +{
- + rwsem_release(&rwsem->dep_map, 1, _RET_IP_);
- + __rt_up_read(rwsem);
- +}
- +EXPORT_SYMBOL(rt_up_read);
- +
- +/*
- + * downgrade a write lock into a read lock
- + * - just wake up any readers at the front of the queue
- + */
- +void rt_downgrade_write(struct rw_semaphore *rwsem)
- +{
- + BUG_ON(rt_mutex_owner(&rwsem->lock) != current);
- + rwsem->read_depth = 1;
- +}
- +EXPORT_SYMBOL(rt_downgrade_write);
- +
- +int rt_down_write_trylock(struct rw_semaphore *rwsem)
- +{
- + int ret = rt_mutex_trylock(&rwsem->lock);
- +
- + if (ret)
- + rwsem_acquire(&rwsem->dep_map, 0, 1, _RET_IP_);
- + return ret;
- +}
- +EXPORT_SYMBOL(rt_down_write_trylock);
- +
- +void rt_down_write(struct rw_semaphore *rwsem)
- +{
- + rwsem_acquire(&rwsem->dep_map, 0, 0, _RET_IP_);
- + rt_mutex_lock(&rwsem->lock);
- +}
- +EXPORT_SYMBOL(rt_down_write);
- +
- +void rt_down_write_nested(struct rw_semaphore *rwsem, int subclass)
- +{
- + rwsem_acquire(&rwsem->dep_map, subclass, 0, _RET_IP_);
- + rt_mutex_lock(&rwsem->lock);
- +}
- +EXPORT_SYMBOL(rt_down_write_nested);
- +
- +void rt_down_write_nested_lock(struct rw_semaphore *rwsem,
- + struct lockdep_map *nest)
- +{
- + rwsem_acquire_nest(&rwsem->dep_map, 0, 0, nest, _RET_IP_);
- + rt_mutex_lock(&rwsem->lock);
- +}
- +EXPORT_SYMBOL(rt_down_write_nested_lock);
- +
- +int rt_down_read_trylock(struct rw_semaphore *rwsem)
- +{
- + struct rt_mutex *lock = &rwsem->lock;
- + int ret = 1;
- +
- + /*
- + * recursive read locks succeed when current owns the rwsem,
- + * but not when read_depth == 0 which means that the rwsem is
- + * write locked.
- + */
- + if (rt_mutex_owner(lock) != current)
- + ret = rt_mutex_trylock(&rwsem->lock);
- + else if (!rwsem->read_depth)
- + ret = 0;
- +
- + if (ret) {
- + rwsem->read_depth++;
- + rwsem_acquire(&rwsem->dep_map, 0, 1, _RET_IP_);
- + }
- + return ret;
- +}
- +EXPORT_SYMBOL(rt_down_read_trylock);
- +
- +static void __rt_down_read(struct rw_semaphore *rwsem, int subclass)
- +{
- + struct rt_mutex *lock = &rwsem->lock;
- +
- + rwsem_acquire_read(&rwsem->dep_map, subclass, 0, _RET_IP_);
- +
- + if (rt_mutex_owner(lock) != current)
- + rt_mutex_lock(&rwsem->lock);
- + rwsem->read_depth++;
- +}
- +
- +void rt_down_read(struct rw_semaphore *rwsem)
- +{
- + __rt_down_read(rwsem, 0);
- +}
- +EXPORT_SYMBOL(rt_down_read);
- +
- +void rt_down_read_nested(struct rw_semaphore *rwsem, int subclass)
- +{
- + __rt_down_read(rwsem, subclass);
- +}
- +EXPORT_SYMBOL(rt_down_read_nested);
- +
- +void __rt_rwsem_init(struct rw_semaphore *rwsem, const char *name,
- + struct lock_class_key *key)
- +{
- +#ifdef CONFIG_DEBUG_LOCK_ALLOC
- + /*
- + * Make sure we are not reinitializing a held lock:
- + */
- + debug_check_no_locks_freed((void *)rwsem, sizeof(*rwsem));
- + lockdep_init_map(&rwsem->dep_map, name, key, 0);
- +#endif
- + rwsem->read_depth = 0;
- + rwsem->lock.save_state = 0;
- +}
- +EXPORT_SYMBOL(__rt_rwsem_init);
- +
- +/**
- + * atomic_dec_and_mutex_lock - return holding mutex if we dec to 0
- + * @cnt: the atomic which we are to dec
- + * @lock: the mutex to return holding if we dec to 0
- + *
- + * return true and hold lock if we dec to 0, return false otherwise
- + */
- +int atomic_dec_and_mutex_lock(atomic_t *cnt, struct mutex *lock)
- +{
- + /* dec if we can't possibly hit 0 */
- + if (atomic_add_unless(cnt, -1, 1))
- + return 0;
- + /* we might hit 0, so take the lock */
- + mutex_lock(lock);
- + if (!atomic_dec_and_test(cnt)) {
- + /* when we actually did the dec, we didn't hit 0 */
- + mutex_unlock(lock);
- + return 0;
- + }
- + /* we hit 0, and we hold the lock */
- + return 1;
- +}
- +EXPORT_SYMBOL(atomic_dec_and_mutex_lock);
- diff -Nur linux-4.1.39.orig/kernel/locking/rtmutex.c linux-4.1.39/kernel/locking/rtmutex.c
- --- linux-4.1.39.orig/kernel/locking/rtmutex.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/locking/rtmutex.c 2017-04-18 17:56:30.625397596 +0200
- @@ -7,6 +7,11 @@
- * Copyright (C) 2005-2006 Timesys Corp., Thomas Gleixner <tglx@timesys.com>
- * Copyright (C) 2005 Kihon Technologies Inc., Steven Rostedt
- * Copyright (C) 2006 Esben Nielsen
- + * Adaptive Spinlocks:
- + * Copyright (C) 2008 Novell, Inc., Gregory Haskins, Sven Dietrich,
- + * and Peter Morreale,
- + * Adaptive Spinlocks simplification:
- + * Copyright (C) 2008 Red Hat, Inc., Steven Rostedt <srostedt@redhat.com>
- *
- * See Documentation/locking/rt-mutex-design.txt for details.
- */
- @@ -16,6 +21,7 @@
- #include <linux/sched/rt.h>
- #include <linux/sched/deadline.h>
- #include <linux/timer.h>
- +#include <linux/ww_mutex.h>
-
- #include "rtmutex_common.h"
-
- @@ -69,6 +75,12 @@
- clear_rt_mutex_waiters(lock);
- }
-
- +static int rt_mutex_real_waiter(struct rt_mutex_waiter *waiter)
- +{
- + return waiter && waiter != PI_WAKEUP_INPROGRESS &&
- + waiter != PI_REQUEUE_INPROGRESS;
- +}
- +
- /*
- * We can speed up the acquire/release, if the architecture
- * supports cmpxchg and if there's no debugging state to be set up
- @@ -300,7 +312,7 @@
- * of task. We do not use the spin_xx_mutex() variants here as we are
- * outside of the debug path.)
- */
- -static void rt_mutex_adjust_prio(struct task_struct *task)
- +void rt_mutex_adjust_prio(struct task_struct *task)
- {
- unsigned long flags;
-
- @@ -335,6 +347,14 @@
- return debug_rt_mutex_detect_deadlock(waiter, chwalk);
- }
-
- +static void rt_mutex_wake_waiter(struct rt_mutex_waiter *waiter)
- +{
- + if (waiter->savestate)
- + wake_up_lock_sleeper(waiter->task);
- + else
- + wake_up_process(waiter->task);
- +}
- +
- /*
- * Max number of times we'll walk the boosting chain:
- */
- @@ -342,7 +362,8 @@
-
- static inline struct rt_mutex *task_blocked_on_lock(struct task_struct *p)
- {
- - return p->pi_blocked_on ? p->pi_blocked_on->lock : NULL;
- + return rt_mutex_real_waiter(p->pi_blocked_on) ?
- + p->pi_blocked_on->lock : NULL;
- }
-
- /*
- @@ -479,7 +500,7 @@
- * reached or the state of the chain has changed while we
- * dropped the locks.
- */
- - if (!waiter)
- + if (!rt_mutex_real_waiter(waiter))
- goto out_unlock_pi;
-
- /*
- @@ -641,13 +662,16 @@
- * follow here. This is the end of the chain we are walking.
- */
- if (!rt_mutex_owner(lock)) {
- + struct rt_mutex_waiter *lock_top_waiter;
- +
- /*
- * If the requeue [7] above changed the top waiter,
- * then we need to wake the new top waiter up to try
- * to get the lock.
- */
- - if (prerequeue_top_waiter != rt_mutex_top_waiter(lock))
- - wake_up_process(rt_mutex_top_waiter(lock)->task);
- + lock_top_waiter = rt_mutex_top_waiter(lock);
- + if (prerequeue_top_waiter != lock_top_waiter)
- + rt_mutex_wake_waiter(lock_top_waiter);
- raw_spin_unlock(&lock->wait_lock);
- return 0;
- }
- @@ -740,6 +764,25 @@
- return ret;
- }
-
- +
- +#define STEAL_NORMAL 0
- +#define STEAL_LATERAL 1
- +
- +/*
- + * Note that RT tasks are excluded from lateral-steals to prevent the
- + * introduction of an unbounded latency
- + */
- +static inline int lock_is_stealable(struct task_struct *task,
- + struct task_struct *pendowner, int mode)
- +{
- + if (mode == STEAL_NORMAL || rt_task(task)) {
- + if (task->prio >= pendowner->prio)
- + return 0;
- + } else if (task->prio > pendowner->prio)
- + return 0;
- + return 1;
- +}
- +
- /*
- * Try to take an rt-mutex
- *
- @@ -750,8 +793,9 @@
- * @waiter: The waiter that is queued to the lock's wait list if the
- * callsite called task_blocked_on_lock(), otherwise NULL
- */
- -static int try_to_take_rt_mutex(struct rt_mutex *lock, struct task_struct *task,
- - struct rt_mutex_waiter *waiter)
- +static int __try_to_take_rt_mutex(struct rt_mutex *lock,
- + struct task_struct *task,
- + struct rt_mutex_waiter *waiter, int mode)
- {
- unsigned long flags;
-
- @@ -790,8 +834,10 @@
- * If waiter is not the highest priority waiter of
- * @lock, give up.
- */
- - if (waiter != rt_mutex_top_waiter(lock))
- + if (waiter != rt_mutex_top_waiter(lock)) {
- + /* XXX lock_is_stealable() ? */
- return 0;
- + }
-
- /*
- * We can acquire the lock. Remove the waiter from the
- @@ -809,14 +855,10 @@
- * not need to be dequeued.
- */
- if (rt_mutex_has_waiters(lock)) {
- - /*
- - * If @task->prio is greater than or equal to
- - * the top waiter priority (kernel view),
- - * @task lost.
- - */
- - if (task->prio >= rt_mutex_top_waiter(lock)->prio)
- - return 0;
- + struct task_struct *pown = rt_mutex_top_waiter(lock)->task;
-
- + if (task != pown && !lock_is_stealable(task, pown, mode))
- + return 0;
- /*
- * The current top waiter stays enqueued. We
- * don't have to change anything in the lock
- @@ -865,6 +907,347 @@
- return 1;
- }
-
- +#ifdef CONFIG_PREEMPT_RT_FULL
- +/*
- + * preemptible spin_lock functions:
- + */
- +static inline void rt_spin_lock_fastlock(struct rt_mutex *lock,
- + void (*slowfn)(struct rt_mutex *lock))
- +{
- + might_sleep_no_state_check();
- +
- + if (likely(rt_mutex_cmpxchg(lock, NULL, current)))
- + rt_mutex_deadlock_account_lock(lock, current);
- + else
- + slowfn(lock);
- +}
- +
- +static inline void rt_spin_lock_fastunlock(struct rt_mutex *lock,
- + void (*slowfn)(struct rt_mutex *lock))
- +{
- + if (likely(rt_mutex_cmpxchg(lock, current, NULL)))
- + rt_mutex_deadlock_account_unlock(current);
- + else
- + slowfn(lock);
- +}
- +#ifdef CONFIG_SMP
- +/*
- + * Note that owner is a speculative pointer and dereferencing relies
- + * on rcu_read_lock() and the check against the lock owner.
- + */
- +static int adaptive_wait(struct rt_mutex *lock,
- + struct task_struct *owner)
- +{
- + int res = 0;
- +
- + rcu_read_lock();
- + for (;;) {
- + if (owner != rt_mutex_owner(lock))
- + break;
- + /*
- + * Ensure that owner->on_cpu is dereferenced _after_
- + * checking the above to be valid.
- + */
- + barrier();
- + if (!owner->on_cpu) {
- + res = 1;
- + break;
- + }
- + cpu_relax();
- + }
- + rcu_read_unlock();
- + return res;
- +}
- +#else
- +static int adaptive_wait(struct rt_mutex *lock,
- + struct task_struct *orig_owner)
- +{
- + return 1;
- +}
- +#endif
- +
- +# define pi_lock(lock) raw_spin_lock_irq(lock)
- +# define pi_unlock(lock) raw_spin_unlock_irq(lock)
- +
- +static int task_blocks_on_rt_mutex(struct rt_mutex *lock,
- + struct rt_mutex_waiter *waiter,
- + struct task_struct *task,
- + enum rtmutex_chainwalk chwalk);
- +/*
- + * Slow path lock function spin_lock style: this variant is very
- + * careful not to miss any non-lock wakeups.
- + *
- + * We store the current state under p->pi_lock in p->saved_state and
- + * the try_to_wake_up() code handles this accordingly.
- + */
- +static void noinline __sched rt_spin_lock_slowlock(struct rt_mutex *lock)
- +{
- + struct task_struct *lock_owner, *self = current;
- + struct rt_mutex_waiter waiter, *top_waiter;
- + int ret;
- +
- + rt_mutex_init_waiter(&waiter, true);
- +
- + raw_spin_lock(&lock->wait_lock);
- +
- + if (__try_to_take_rt_mutex(lock, self, NULL, STEAL_LATERAL)) {
- + raw_spin_unlock(&lock->wait_lock);
- + return;
- + }
- +
- + BUG_ON(rt_mutex_owner(lock) == self);
- +
- + /*
- + * We save whatever state the task is in and we'll restore it
- + * after acquiring the lock taking real wakeups into account
- + * as well. We are serialized via pi_lock against wakeups. See
- + * try_to_wake_up().
- + */
- + pi_lock(&self->pi_lock);
- + self->saved_state = self->state;
- + __set_current_state_no_track(TASK_UNINTERRUPTIBLE);
- + pi_unlock(&self->pi_lock);
- +
- + ret = task_blocks_on_rt_mutex(lock, &waiter, self, RT_MUTEX_MIN_CHAINWALK);
- + BUG_ON(ret);
- +
- + for (;;) {
- + /* Try to acquire the lock again. */
- + if (__try_to_take_rt_mutex(lock, self, &waiter, STEAL_LATERAL))
- + break;
- +
- + top_waiter = rt_mutex_top_waiter(lock);
- + lock_owner = rt_mutex_owner(lock);
- +
- + raw_spin_unlock(&lock->wait_lock);
- +
- + debug_rt_mutex_print_deadlock(&waiter);
- +
- + if (top_waiter != &waiter || adaptive_wait(lock, lock_owner))
- + schedule_rt_mutex(lock);
- +
- + raw_spin_lock(&lock->wait_lock);
- +
- + pi_lock(&self->pi_lock);
- + __set_current_state_no_track(TASK_UNINTERRUPTIBLE);
- + pi_unlock(&self->pi_lock);
- + }
- +
- + /*
- + * Restore the task state to current->saved_state. We set it
- + * to the original state above and the try_to_wake_up() code
- + * has possibly updated it when a real (non-rtmutex) wakeup
- + * happened while we were blocked. Clear saved_state so
- + * try_to_wakeup() does not get confused.
- + */
- + pi_lock(&self->pi_lock);
- + __set_current_state_no_track(self->saved_state);
- + self->saved_state = TASK_RUNNING;
- + pi_unlock(&self->pi_lock);
- +
- + /*
- + * try_to_take_rt_mutex() sets the waiter bit
- + * unconditionally. We might have to fix that up:
- + */
- + fixup_rt_mutex_waiters(lock);
- +
- + BUG_ON(rt_mutex_has_waiters(lock) && &waiter == rt_mutex_top_waiter(lock));
- + BUG_ON(!RB_EMPTY_NODE(&waiter.tree_entry));
- +
- + raw_spin_unlock(&lock->wait_lock);
- +
- + debug_rt_mutex_free_waiter(&waiter);
- +}
- +
- +static void wakeup_next_waiter(struct rt_mutex *lock);
- +/*
- + * Slow path to release a rt_mutex spin_lock style
- + */
- +static void noinline __sched rt_spin_lock_slowunlock(struct rt_mutex *lock)
- +{
- + raw_spin_lock(&lock->wait_lock);
- +
- + debug_rt_mutex_unlock(lock);
- +
- + rt_mutex_deadlock_account_unlock(current);
- +
- + if (!rt_mutex_has_waiters(lock)) {
- + lock->owner = NULL;
- + raw_spin_unlock(&lock->wait_lock);
- + return;
- + }
- +
- + wakeup_next_waiter(lock);
- +
- + raw_spin_unlock(&lock->wait_lock);
- +
- + /* Undo pi boosting.when necessary */
- + rt_mutex_adjust_prio(current);
- +}
- +
- +void __lockfunc rt_spin_lock(spinlock_t *lock)
- +{
- + rt_spin_lock_fastlock(&lock->lock, rt_spin_lock_slowlock);
- + spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
- +}
- +EXPORT_SYMBOL(rt_spin_lock);
- +
- +void __lockfunc __rt_spin_lock(struct rt_mutex *lock)
- +{
- + rt_spin_lock_fastlock(lock, rt_spin_lock_slowlock);
- +}
- +EXPORT_SYMBOL(__rt_spin_lock);
- +
- +#ifdef CONFIG_DEBUG_LOCK_ALLOC
- +void __lockfunc rt_spin_lock_nested(spinlock_t *lock, int subclass)
- +{
- + rt_spin_lock_fastlock(&lock->lock, rt_spin_lock_slowlock);
- + spin_acquire(&lock->dep_map, subclass, 0, _RET_IP_);
- +}
- +EXPORT_SYMBOL(rt_spin_lock_nested);
- +#endif
- +
- +void __lockfunc rt_spin_unlock(spinlock_t *lock)
- +{
- + /* NOTE: we always pass in '1' for nested, for simplicity */
- + spin_release(&lock->dep_map, 1, _RET_IP_);
- + rt_spin_lock_fastunlock(&lock->lock, rt_spin_lock_slowunlock);
- +}
- +EXPORT_SYMBOL(rt_spin_unlock);
- +
- +void __lockfunc __rt_spin_unlock(struct rt_mutex *lock)
- +{
- + rt_spin_lock_fastunlock(lock, rt_spin_lock_slowunlock);
- +}
- +EXPORT_SYMBOL(__rt_spin_unlock);
- +
- +/*
- + * Wait for the lock to get unlocked: instead of polling for an unlock
- + * (like raw spinlocks do), we lock and unlock, to force the kernel to
- + * schedule if there's contention:
- + */
- +void __lockfunc rt_spin_unlock_wait(spinlock_t *lock)
- +{
- + spin_lock(lock);
- + spin_unlock(lock);
- +}
- +EXPORT_SYMBOL(rt_spin_unlock_wait);
- +
- +int __lockfunc __rt_spin_trylock(struct rt_mutex *lock)
- +{
- + return rt_mutex_trylock(lock);
- +}
- +
- +int __lockfunc rt_spin_trylock(spinlock_t *lock)
- +{
- + int ret = rt_mutex_trylock(&lock->lock);
- +
- + if (ret)
- + spin_acquire(&lock->dep_map, 0, 1, _RET_IP_);
- + return ret;
- +}
- +EXPORT_SYMBOL(rt_spin_trylock);
- +
- +int __lockfunc rt_spin_trylock_bh(spinlock_t *lock)
- +{
- + int ret;
- +
- + local_bh_disable();
- + ret = rt_mutex_trylock(&lock->lock);
- + if (ret) {
- + migrate_disable();
- + spin_acquire(&lock->dep_map, 0, 1, _RET_IP_);
- + } else
- + local_bh_enable();
- + return ret;
- +}
- +EXPORT_SYMBOL(rt_spin_trylock_bh);
- +
- +int __lockfunc rt_spin_trylock_irqsave(spinlock_t *lock, unsigned long *flags)
- +{
- + int ret;
- +
- + *flags = 0;
- + ret = rt_mutex_trylock(&lock->lock);
- + if (ret) {
- + migrate_disable();
- + spin_acquire(&lock->dep_map, 0, 1, _RET_IP_);
- + }
- + return ret;
- +}
- +EXPORT_SYMBOL(rt_spin_trylock_irqsave);
- +
- +int atomic_dec_and_spin_lock(atomic_t *atomic, spinlock_t *lock)
- +{
- + /* Subtract 1 from counter unless that drops it to 0 (ie. it was 1) */
- + if (atomic_add_unless(atomic, -1, 1))
- + return 0;
- + migrate_disable();
- + rt_spin_lock(lock);
- + if (atomic_dec_and_test(atomic))
- + return 1;
- + rt_spin_unlock(lock);
- + migrate_enable();
- + return 0;
- +}
- +EXPORT_SYMBOL(atomic_dec_and_spin_lock);
- +
- + void
- +__rt_spin_lock_init(spinlock_t *lock, char *name, struct lock_class_key *key)
- +{
- +#ifdef CONFIG_DEBUG_LOCK_ALLOC
- + /*
- + * Make sure we are not reinitializing a held lock:
- + */
- + debug_check_no_locks_freed((void *)lock, sizeof(*lock));
- + lockdep_init_map(&lock->dep_map, name, key, 0);
- +#endif
- +}
- +EXPORT_SYMBOL(__rt_spin_lock_init);
- +
- +#endif /* PREEMPT_RT_FULL */
- +
- +#ifdef CONFIG_PREEMPT_RT_FULL
- + static inline int __sched
- +__mutex_lock_check_stamp(struct rt_mutex *lock, struct ww_acquire_ctx *ctx)
- +{
- + struct ww_mutex *ww = container_of(lock, struct ww_mutex, base.lock);
- + struct ww_acquire_ctx *hold_ctx = ACCESS_ONCE(ww->ctx);
- +
- + if (!hold_ctx)
- + return 0;
- +
- + if (unlikely(ctx == hold_ctx))
- + return -EALREADY;
- +
- + if (ctx->stamp - hold_ctx->stamp <= LONG_MAX &&
- + (ctx->stamp != hold_ctx->stamp || ctx > hold_ctx)) {
- +#ifdef CONFIG_DEBUG_MUTEXES
- + DEBUG_LOCKS_WARN_ON(ctx->contending_lock);
- + ctx->contending_lock = ww;
- +#endif
- + return -EDEADLK;
- + }
- +
- + return 0;
- +}
- +#else
- + static inline int __sched
- +__mutex_lock_check_stamp(struct rt_mutex *lock, struct ww_acquire_ctx *ctx)
- +{
- + BUG();
- + return 0;
- +}
- +
- +#endif
- +
- +static inline int
- +try_to_take_rt_mutex(struct rt_mutex *lock, struct task_struct *task,
- + struct rt_mutex_waiter *waiter)
- +{
- + return __try_to_take_rt_mutex(lock, task, waiter, STEAL_NORMAL);
- +}
- +
- /*
- * Task blocks on lock.
- *
- @@ -896,6 +1279,23 @@
- return -EDEADLK;
-
- raw_spin_lock_irqsave(&task->pi_lock, flags);
- +
- + /*
- + * In the case of futex requeue PI, this will be a proxy
- + * lock. The task will wake unaware that it is enqueueed on
- + * this lock. Avoid blocking on two locks and corrupting
- + * pi_blocked_on via the PI_WAKEUP_INPROGRESS
- + * flag. futex_wait_requeue_pi() sets this when it wakes up
- + * before requeue (due to a signal or timeout). Do not enqueue
- + * the task if PI_WAKEUP_INPROGRESS is set.
- + */
- + if (task != current && task->pi_blocked_on == PI_WAKEUP_INPROGRESS) {
- + raw_spin_unlock_irqrestore(&task->pi_lock, flags);
- + return -EAGAIN;
- + }
- +
- + BUG_ON(rt_mutex_real_waiter(task->pi_blocked_on));
- +
- __rt_mutex_adjust_prio(task);
- waiter->task = task;
- waiter->lock = lock;
- @@ -919,7 +1319,7 @@
- rt_mutex_enqueue_pi(owner, waiter);
-
- __rt_mutex_adjust_prio(owner);
- - if (owner->pi_blocked_on)
- + if (rt_mutex_real_waiter(owner->pi_blocked_on))
- chain_walk = 1;
- } else if (rt_mutex_cond_detect_deadlock(waiter, chwalk)) {
- chain_walk = 1;
- @@ -957,8 +1357,9 @@
- /*
- * Wake up the next waiter on the lock.
- *
- - * Remove the top waiter from the current tasks pi waiter list and
- - * wake it up.
- + * Remove the top waiter from the current tasks pi waiter list,
- + * wake it up and return whether the current task needs to undo
- + * a potential priority boosting.
- *
- * Called with lock->wait_lock held.
- */
- @@ -996,7 +1397,7 @@
- * long as we hold lock->wait_lock. The waiter task needs to
- * acquire it in order to dequeue the waiter.
- */
- - wake_up_process(waiter->task);
- + rt_mutex_wake_waiter(waiter);
- }
-
- /*
- @@ -1010,7 +1411,7 @@
- {
- bool is_top_waiter = (waiter == rt_mutex_top_waiter(lock));
- struct task_struct *owner = rt_mutex_owner(lock);
- - struct rt_mutex *next_lock;
- + struct rt_mutex *next_lock = NULL;
- unsigned long flags;
-
- raw_spin_lock_irqsave(¤t->pi_lock, flags);
- @@ -1035,7 +1436,8 @@
- __rt_mutex_adjust_prio(owner);
-
- /* Store the lock on which owner is blocked or NULL */
- - next_lock = task_blocked_on_lock(owner);
- + if (rt_mutex_real_waiter(owner->pi_blocked_on))
- + next_lock = task_blocked_on_lock(owner);
-
- raw_spin_unlock_irqrestore(&owner->pi_lock, flags);
-
- @@ -1071,17 +1473,17 @@
- raw_spin_lock_irqsave(&task->pi_lock, flags);
-
- waiter = task->pi_blocked_on;
- - if (!waiter || (waiter->prio == task->prio &&
- + if (!rt_mutex_real_waiter(waiter) || (waiter->prio == task->prio &&
- !dl_prio(task->prio))) {
- raw_spin_unlock_irqrestore(&task->pi_lock, flags);
- return;
- }
- next_lock = waiter->lock;
- - raw_spin_unlock_irqrestore(&task->pi_lock, flags);
-
- /* gets dropped in rt_mutex_adjust_prio_chain()! */
- get_task_struct(task);
-
- + raw_spin_unlock_irqrestore(&task->pi_lock, flags);
- rt_mutex_adjust_prio_chain(task, RT_MUTEX_MIN_CHAINWALK, NULL,
- next_lock, NULL, task);
- }
- @@ -1099,7 +1501,8 @@
- static int __sched
- __rt_mutex_slowlock(struct rt_mutex *lock, int state,
- struct hrtimer_sleeper *timeout,
- - struct rt_mutex_waiter *waiter)
- + struct rt_mutex_waiter *waiter,
- + struct ww_acquire_ctx *ww_ctx)
- {
- int ret = 0;
-
- @@ -1122,6 +1525,12 @@
- break;
- }
-
- + if (ww_ctx && ww_ctx->acquired > 0) {
- + ret = __mutex_lock_check_stamp(lock, ww_ctx);
- + if (ret)
- + break;
- + }
- +
- raw_spin_unlock(&lock->wait_lock);
-
- debug_rt_mutex_print_deadlock(waiter);
- @@ -1156,25 +1565,102 @@
- }
- }
-
- +static __always_inline void ww_mutex_lock_acquired(struct ww_mutex *ww,
- + struct ww_acquire_ctx *ww_ctx)
- +{
- +#ifdef CONFIG_DEBUG_MUTEXES
- + /*
- + * If this WARN_ON triggers, you used ww_mutex_lock to acquire,
- + * but released with a normal mutex_unlock in this call.
- + *
- + * This should never happen, always use ww_mutex_unlock.
- + */
- + DEBUG_LOCKS_WARN_ON(ww->ctx);
- +
- + /*
- + * Not quite done after calling ww_acquire_done() ?
- + */
- + DEBUG_LOCKS_WARN_ON(ww_ctx->done_acquire);
- +
- + if (ww_ctx->contending_lock) {
- + /*
- + * After -EDEADLK you tried to
- + * acquire a different ww_mutex? Bad!
- + */
- + DEBUG_LOCKS_WARN_ON(ww_ctx->contending_lock != ww);
- +
- + /*
- + * You called ww_mutex_lock after receiving -EDEADLK,
- + * but 'forgot' to unlock everything else first?
- + */
- + DEBUG_LOCKS_WARN_ON(ww_ctx->acquired > 0);
- + ww_ctx->contending_lock = NULL;
- + }
- +
- + /*
- + * Naughty, using a different class will lead to undefined behavior!
- + */
- + DEBUG_LOCKS_WARN_ON(ww_ctx->ww_class != ww->ww_class);
- +#endif
- + ww_ctx->acquired++;
- +}
- +
- +#ifdef CONFIG_PREEMPT_RT_FULL
- +static void ww_mutex_account_lock(struct rt_mutex *lock,
- + struct ww_acquire_ctx *ww_ctx)
- +{
- + struct ww_mutex *ww = container_of(lock, struct ww_mutex, base.lock);
- + struct rt_mutex_waiter *waiter, *n;
- +
- + /*
- + * This branch gets optimized out for the common case,
- + * and is only important for ww_mutex_lock.
- + */
- + ww_mutex_lock_acquired(ww, ww_ctx);
- + ww->ctx = ww_ctx;
- +
- + /*
- + * Give any possible sleeping processes the chance to wake up,
- + * so they can recheck if they have to back off.
- + */
- + rbtree_postorder_for_each_entry_safe(waiter, n, &lock->waiters,
- + tree_entry) {
- + /* XXX debug rt mutex waiter wakeup */
- +
- + BUG_ON(waiter->lock != lock);
- + rt_mutex_wake_waiter(waiter);
- + }
- +}
- +
- +#else
- +
- +static void ww_mutex_account_lock(struct rt_mutex *lock,
- + struct ww_acquire_ctx *ww_ctx)
- +{
- + BUG();
- +}
- +#endif
- +
- /*
- * Slow path lock function:
- */
- static int __sched
- rt_mutex_slowlock(struct rt_mutex *lock, int state,
- struct hrtimer_sleeper *timeout,
- - enum rtmutex_chainwalk chwalk)
- + enum rtmutex_chainwalk chwalk,
- + struct ww_acquire_ctx *ww_ctx)
- {
- struct rt_mutex_waiter waiter;
- int ret = 0;
-
- - debug_rt_mutex_init_waiter(&waiter);
- - RB_CLEAR_NODE(&waiter.pi_tree_entry);
- - RB_CLEAR_NODE(&waiter.tree_entry);
- + rt_mutex_init_waiter(&waiter, false);
-
- raw_spin_lock(&lock->wait_lock);
-
- /* Try to acquire the lock again: */
- if (try_to_take_rt_mutex(lock, current, NULL)) {
- + if (ww_ctx)
- + ww_mutex_account_lock(lock, ww_ctx);
- raw_spin_unlock(&lock->wait_lock);
- return 0;
- }
- @@ -1192,13 +1678,23 @@
-
- if (likely(!ret))
- /* sleep on the mutex */
- - ret = __rt_mutex_slowlock(lock, state, timeout, &waiter);
- + ret = __rt_mutex_slowlock(lock, state, timeout, &waiter,
- + ww_ctx);
- + else if (ww_ctx) {
- + /* ww_mutex received EDEADLK, let it become EALREADY */
- + ret = __mutex_lock_check_stamp(lock, ww_ctx);
- + BUG_ON(!ret);
- + }
-
- if (unlikely(ret)) {
- __set_current_state(TASK_RUNNING);
- if (rt_mutex_has_waiters(lock))
- remove_waiter(lock, &waiter);
- - rt_mutex_handle_deadlock(ret, chwalk, &waiter);
- + /* ww_mutex want to report EDEADLK/EALREADY, let them */
- + if (!ww_ctx)
- + rt_mutex_handle_deadlock(ret, chwalk, &waiter);
- + } else if (ww_ctx) {
- + ww_mutex_account_lock(lock, ww_ctx);
- }
-
- /*
- @@ -1255,7 +1751,7 @@
- /*
- * Slow path to release a rt-mutex:
- */
- -static void __sched
- +static bool __sched
- rt_mutex_slowunlock(struct rt_mutex *lock)
- {
- raw_spin_lock(&lock->wait_lock);
- @@ -1298,7 +1794,7 @@
- while (!rt_mutex_has_waiters(lock)) {
- /* Drops lock->wait_lock ! */
- if (unlock_rt_mutex_safe(lock) == true)
- - return;
- + return false;
- /* Relock the rtmutex and try again */
- raw_spin_lock(&lock->wait_lock);
- }
- @@ -1311,8 +1807,7 @@
-
- raw_spin_unlock(&lock->wait_lock);
-
- - /* Undo pi boosting if necessary: */
- - rt_mutex_adjust_prio(current);
- + return true;
- }
-
- /*
- @@ -1323,31 +1818,36 @@
- */
- static inline int
- rt_mutex_fastlock(struct rt_mutex *lock, int state,
- + struct ww_acquire_ctx *ww_ctx,
- int (*slowfn)(struct rt_mutex *lock, int state,
- struct hrtimer_sleeper *timeout,
- - enum rtmutex_chainwalk chwalk))
- + enum rtmutex_chainwalk chwalk,
- + struct ww_acquire_ctx *ww_ctx))
- {
- if (likely(rt_mutex_cmpxchg(lock, NULL, current))) {
- rt_mutex_deadlock_account_lock(lock, current);
- return 0;
- } else
- - return slowfn(lock, state, NULL, RT_MUTEX_MIN_CHAINWALK);
- + return slowfn(lock, state, NULL, RT_MUTEX_MIN_CHAINWALK,
- + ww_ctx);
- }
-
- static inline int
- rt_mutex_timed_fastlock(struct rt_mutex *lock, int state,
- struct hrtimer_sleeper *timeout,
- enum rtmutex_chainwalk chwalk,
- + struct ww_acquire_ctx *ww_ctx,
- int (*slowfn)(struct rt_mutex *lock, int state,
- struct hrtimer_sleeper *timeout,
- - enum rtmutex_chainwalk chwalk))
- + enum rtmutex_chainwalk chwalk,
- + struct ww_acquire_ctx *ww_ctx))
- {
- if (chwalk == RT_MUTEX_MIN_CHAINWALK &&
- likely(rt_mutex_cmpxchg(lock, NULL, current))) {
- rt_mutex_deadlock_account_lock(lock, current);
- return 0;
- } else
- - return slowfn(lock, state, timeout, chwalk);
- + return slowfn(lock, state, timeout, chwalk, ww_ctx);
- }
-
- static inline int
- @@ -1363,12 +1863,14 @@
-
- static inline void
- rt_mutex_fastunlock(struct rt_mutex *lock,
- - void (*slowfn)(struct rt_mutex *lock))
- + bool (*slowfn)(struct rt_mutex *lock))
- {
- - if (likely(rt_mutex_cmpxchg(lock, current, NULL)))
- + if (likely(rt_mutex_cmpxchg(lock, current, NULL))) {
- rt_mutex_deadlock_account_unlock(current);
- - else
- - slowfn(lock);
- + } else if (slowfn(lock)) {
- + /* Undo pi boosting if necessary: */
- + rt_mutex_adjust_prio(current);
- + }
- }
-
- /**
- @@ -1380,7 +1882,7 @@
- {
- might_sleep();
-
- - rt_mutex_fastlock(lock, TASK_UNINTERRUPTIBLE, rt_mutex_slowlock);
- + rt_mutex_fastlock(lock, TASK_UNINTERRUPTIBLE, NULL, rt_mutex_slowlock);
- }
- EXPORT_SYMBOL_GPL(rt_mutex_lock);
-
- @@ -1397,7 +1899,7 @@
- {
- might_sleep();
-
- - return rt_mutex_fastlock(lock, TASK_INTERRUPTIBLE, rt_mutex_slowlock);
- + return rt_mutex_fastlock(lock, TASK_INTERRUPTIBLE, NULL, rt_mutex_slowlock);
- }
- EXPORT_SYMBOL_GPL(rt_mutex_lock_interruptible);
-
- @@ -1410,11 +1912,30 @@
- might_sleep();
-
- return rt_mutex_timed_fastlock(lock, TASK_INTERRUPTIBLE, timeout,
- - RT_MUTEX_FULL_CHAINWALK,
- + RT_MUTEX_FULL_CHAINWALK, NULL,
- rt_mutex_slowlock);
- }
-
- /**
- + * rt_mutex_lock_killable - lock a rt_mutex killable
- + *
- + * @lock: the rt_mutex to be locked
- + * @detect_deadlock: deadlock detection on/off
- + *
- + * Returns:
- + * 0 on success
- + * -EINTR when interrupted by a signal
- + * -EDEADLK when the lock would deadlock (when deadlock detection is on)
- + */
- +int __sched rt_mutex_lock_killable(struct rt_mutex *lock)
- +{
- + might_sleep();
- +
- + return rt_mutex_fastlock(lock, TASK_KILLABLE, NULL, rt_mutex_slowlock);
- +}
- +EXPORT_SYMBOL_GPL(rt_mutex_lock_killable);
- +
- +/**
- * rt_mutex_timed_lock - lock a rt_mutex interruptible
- * the timeout structure is provided
- * by the caller
- @@ -1434,6 +1955,7 @@
-
- return rt_mutex_timed_fastlock(lock, TASK_INTERRUPTIBLE, timeout,
- RT_MUTEX_MIN_CHAINWALK,
- + NULL,
- rt_mutex_slowlock);
- }
- EXPORT_SYMBOL_GPL(rt_mutex_timed_lock);
- @@ -1463,6 +1985,22 @@
- EXPORT_SYMBOL_GPL(rt_mutex_unlock);
-
- /**
- + * rt_mutex_futex_unlock - Futex variant of rt_mutex_unlock
- + * @lock: the rt_mutex to be unlocked
- + *
- + * Returns: true/false indicating whether priority adjustment is
- + * required or not.
- + */
- +bool __sched rt_mutex_futex_unlock(struct rt_mutex *lock)
- +{
- + if (likely(rt_mutex_cmpxchg(lock, current, NULL))) {
- + rt_mutex_deadlock_account_unlock(current);
- + return false;
- + }
- + return rt_mutex_slowunlock(lock);
- +}
- +
- +/**
- * rt_mutex_destroy - mark a mutex unusable
- * @lock: the mutex to be destroyed
- *
- @@ -1492,13 +2030,12 @@
- void __rt_mutex_init(struct rt_mutex *lock, const char *name)
- {
- lock->owner = NULL;
- - raw_spin_lock_init(&lock->wait_lock);
- lock->waiters = RB_ROOT;
- lock->waiters_leftmost = NULL;
-
- debug_rt_mutex_init(lock, name);
- }
- -EXPORT_SYMBOL_GPL(__rt_mutex_init);
- +EXPORT_SYMBOL(__rt_mutex_init);
-
- /**
- * rt_mutex_init_proxy_locked - initialize and lock a rt_mutex on behalf of a
- @@ -1513,7 +2050,7 @@
- void rt_mutex_init_proxy_locked(struct rt_mutex *lock,
- struct task_struct *proxy_owner)
- {
- - __rt_mutex_init(lock, NULL);
- + rt_mutex_init(lock);
- debug_rt_mutex_proxy_lock(lock, proxy_owner);
- rt_mutex_set_owner(lock, proxy_owner);
- rt_mutex_deadlock_account_lock(lock, proxy_owner);
- @@ -1561,6 +2098,35 @@
- return 1;
- }
-
- +#ifdef CONFIG_PREEMPT_RT_FULL
- + /*
- + * In PREEMPT_RT there's an added race.
- + * If the task, that we are about to requeue, times out,
- + * it can set the PI_WAKEUP_INPROGRESS. This tells the requeue
- + * to skip this task. But right after the task sets
- + * its pi_blocked_on to PI_WAKEUP_INPROGRESS it can then
- + * block on the spin_lock(&hb->lock), which in RT is an rtmutex.
- + * This will replace the PI_WAKEUP_INPROGRESS with the actual
- + * lock that it blocks on. We *must not* place this task
- + * on this proxy lock in that case.
- + *
- + * To prevent this race, we first take the task's pi_lock
- + * and check if it has updated its pi_blocked_on. If it has,
- + * we assume that it woke up and we return -EAGAIN.
- + * Otherwise, we set the task's pi_blocked_on to
- + * PI_REQUEUE_INPROGRESS, so that if the task is waking up
- + * it will know that we are in the process of requeuing it.
- + */
- + raw_spin_lock_irq(&task->pi_lock);
- + if (task->pi_blocked_on) {
- + raw_spin_unlock_irq(&task->pi_lock);
- + raw_spin_unlock(&lock->wait_lock);
- + return -EAGAIN;
- + }
- + task->pi_blocked_on = PI_REQUEUE_INPROGRESS;
- + raw_spin_unlock_irq(&task->pi_lock);
- +#endif
- +
- /* We enforce deadlock detection for futexes */
- ret = task_blocks_on_rt_mutex(lock, waiter, task,
- RT_MUTEX_FULL_CHAINWALK);
- @@ -1575,7 +2141,7 @@
- ret = 0;
- }
-
- - if (unlikely(ret))
- + if (ret && rt_mutex_has_waiters(lock))
- remove_waiter(lock, waiter);
-
- raw_spin_unlock(&lock->wait_lock);
- @@ -1631,7 +2197,7 @@
- set_current_state(TASK_INTERRUPTIBLE);
-
- /* sleep on the mutex */
- - ret = __rt_mutex_slowlock(lock, TASK_INTERRUPTIBLE, to, waiter);
- + ret = __rt_mutex_slowlock(lock, TASK_INTERRUPTIBLE, to, waiter, NULL);
-
- if (unlikely(ret))
- remove_waiter(lock, waiter);
- @@ -1646,3 +2212,89 @@
-
- return ret;
- }
- +
- +static inline int
- +ww_mutex_deadlock_injection(struct ww_mutex *lock, struct ww_acquire_ctx *ctx)
- +{
- +#ifdef CONFIG_DEBUG_WW_MUTEX_SLOWPATH
- + unsigned tmp;
- +
- + if (ctx->deadlock_inject_countdown-- == 0) {
- + tmp = ctx->deadlock_inject_interval;
- + if (tmp > UINT_MAX/4)
- + tmp = UINT_MAX;
- + else
- + tmp = tmp*2 + tmp + tmp/2;
- +
- + ctx->deadlock_inject_interval = tmp;
- + ctx->deadlock_inject_countdown = tmp;
- + ctx->contending_lock = lock;
- +
- + ww_mutex_unlock(lock);
- +
- + return -EDEADLK;
- + }
- +#endif
- +
- + return 0;
- +}
- +
- +#ifdef CONFIG_PREEMPT_RT_FULL
- +int __sched
- +__ww_mutex_lock_interruptible(struct ww_mutex *lock, struct ww_acquire_ctx *ww_ctx)
- +{
- + int ret;
- +
- + might_sleep();
- +
- + mutex_acquire_nest(&lock->base.dep_map, 0, 0, &ww_ctx->dep_map, _RET_IP_);
- + ret = rt_mutex_slowlock(&lock->base.lock, TASK_INTERRUPTIBLE, NULL, 0, ww_ctx);
- + if (ret)
- + mutex_release(&lock->base.dep_map, 1, _RET_IP_);
- + else if (!ret && ww_ctx->acquired > 1)
- + return ww_mutex_deadlock_injection(lock, ww_ctx);
- +
- + return ret;
- +}
- +EXPORT_SYMBOL_GPL(__ww_mutex_lock_interruptible);
- +
- +int __sched
- +__ww_mutex_lock(struct ww_mutex *lock, struct ww_acquire_ctx *ww_ctx)
- +{
- + int ret;
- +
- + might_sleep();
- +
- + mutex_acquire_nest(&lock->base.dep_map, 0, 0, &ww_ctx->dep_map, _RET_IP_);
- + ret = rt_mutex_slowlock(&lock->base.lock, TASK_UNINTERRUPTIBLE, NULL, 0, ww_ctx);
- + if (ret)
- + mutex_release(&lock->base.dep_map, 1, _RET_IP_);
- + else if (!ret && ww_ctx->acquired > 1)
- + return ww_mutex_deadlock_injection(lock, ww_ctx);
- +
- + return ret;
- +}
- +EXPORT_SYMBOL_GPL(__ww_mutex_lock);
- +
- +void __sched ww_mutex_unlock(struct ww_mutex *lock)
- +{
- + int nest = !!lock->ctx;
- +
- + /*
- + * The unlocking fastpath is the 0->1 transition from 'locked'
- + * into 'unlocked' state:
- + */
- + if (nest) {
- +#ifdef CONFIG_DEBUG_MUTEXES
- + DEBUG_LOCKS_WARN_ON(!lock->ctx->acquired);
- +#endif
- + if (lock->ctx->acquired > 0)
- + lock->ctx->acquired--;
- + lock->ctx = NULL;
- + }
- +
- + mutex_release(&lock->base.dep_map, nest, _RET_IP_);
- + rt_mutex_unlock(&lock->base.lock);
- +}
- +EXPORT_SYMBOL(ww_mutex_unlock);
- +#endif
- diff -Nur linux-4.1.39.orig/kernel/locking/rtmutex_common.h linux-4.1.39/kernel/locking/rtmutex_common.h
- --- linux-4.1.39.orig/kernel/locking/rtmutex_common.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/locking/rtmutex_common.h 2017-04-18 17:56:30.625397596 +0200
- @@ -49,6 +49,7 @@
- struct rb_node pi_tree_entry;
- struct task_struct *task;
- struct rt_mutex *lock;
- + bool savestate;
- #ifdef CONFIG_DEBUG_RT_MUTEXES
- unsigned long ip;
- struct pid *deadlock_task_pid;
- @@ -119,6 +120,9 @@
- /*
- * PI-futex support (proxy locking functions, etc.):
- */
- +#define PI_WAKEUP_INPROGRESS ((struct rt_mutex_waiter *) 1)
- +#define PI_REQUEUE_INPROGRESS ((struct rt_mutex_waiter *) 2)
- +
- extern struct task_struct *rt_mutex_next_owner(struct rt_mutex *lock);
- extern void rt_mutex_init_proxy_locked(struct rt_mutex *lock,
- struct task_struct *proxy_owner);
- @@ -132,10 +136,24 @@
- struct rt_mutex_waiter *waiter);
- extern int rt_mutex_timed_futex_lock(struct rt_mutex *l, struct hrtimer_sleeper *to);
-
- +extern bool rt_mutex_futex_unlock(struct rt_mutex *lock);
- +
- +extern void rt_mutex_adjust_prio(struct task_struct *task);
- +
- #ifdef CONFIG_DEBUG_RT_MUTEXES
- # include "rtmutex-debug.h"
- #else
- # include "rtmutex.h"
- #endif
-
- +static inline void
- +rt_mutex_init_waiter(struct rt_mutex_waiter *waiter, bool savestate)
- +{
- + debug_rt_mutex_init_waiter(waiter);
- + waiter->task = NULL;
- + waiter->savestate = savestate;
- + RB_CLEAR_NODE(&waiter->pi_tree_entry);
- + RB_CLEAR_NODE(&waiter->tree_entry);
- +}
- +
- #endif
- diff -Nur linux-4.1.39.orig/kernel/locking/spinlock.c linux-4.1.39/kernel/locking/spinlock.c
- --- linux-4.1.39.orig/kernel/locking/spinlock.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/locking/spinlock.c 2017-04-18 17:56:30.625397596 +0200
- @@ -124,8 +124,11 @@
- * __[spin|read|write]_lock_bh()
- */
- BUILD_LOCK_OPS(spin, raw_spinlock);
- +
- +#ifndef CONFIG_PREEMPT_RT_FULL
- BUILD_LOCK_OPS(read, rwlock);
- BUILD_LOCK_OPS(write, rwlock);
- +#endif
-
- #endif
-
- @@ -209,6 +212,8 @@
- EXPORT_SYMBOL(_raw_spin_unlock_bh);
- #endif
-
- +#ifndef CONFIG_PREEMPT_RT_FULL
- +
- #ifndef CONFIG_INLINE_READ_TRYLOCK
- int __lockfunc _raw_read_trylock(rwlock_t *lock)
- {
- @@ -353,6 +358,8 @@
- EXPORT_SYMBOL(_raw_write_unlock_bh);
- #endif
-
- +#endif /* !PREEMPT_RT_FULL */
- +
- #ifdef CONFIG_DEBUG_LOCK_ALLOC
-
- void __lockfunc _raw_spin_lock_nested(raw_spinlock_t *lock, int subclass)
- diff -Nur linux-4.1.39.orig/kernel/locking/spinlock_debug.c linux-4.1.39/kernel/locking/spinlock_debug.c
- --- linux-4.1.39.orig/kernel/locking/spinlock_debug.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/locking/spinlock_debug.c 2017-04-18 17:56:30.625397596 +0200
- @@ -31,6 +31,7 @@
-
- EXPORT_SYMBOL(__raw_spin_lock_init);
-
- +#ifndef CONFIG_PREEMPT_RT_FULL
- void __rwlock_init(rwlock_t *lock, const char *name,
- struct lock_class_key *key)
- {
- @@ -48,6 +49,7 @@
- }
-
- EXPORT_SYMBOL(__rwlock_init);
- +#endif
-
- static void spin_dump(raw_spinlock_t *lock, const char *msg)
- {
- @@ -159,6 +161,7 @@
- arch_spin_unlock(&lock->raw_lock);
- }
-
- +#ifndef CONFIG_PREEMPT_RT_FULL
- static void rwlock_bug(rwlock_t *lock, const char *msg)
- {
- if (!debug_locks_off())
- @@ -300,3 +303,5 @@
- debug_write_unlock(lock);
- arch_write_unlock(&lock->raw_lock);
- }
- +
- +#endif
- diff -Nur linux-4.1.39.orig/kernel/module.c linux-4.1.39/kernel/module.c
- --- linux-4.1.39.orig/kernel/module.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/module.c 2017-04-18 17:56:30.625397596 +0200
- @@ -525,16 +525,7 @@
- memcpy(per_cpu_ptr(mod->percpu, cpu), from, size);
- }
-
- -/**
- - * is_module_percpu_address - test whether address is from module static percpu
- - * @addr: address to test
- - *
- - * Test whether @addr belongs to module static percpu area.
- - *
- - * RETURNS:
- - * %true if @addr is from module static percpu area
- - */
- -bool is_module_percpu_address(unsigned long addr)
- +bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr)
- {
- struct module *mod;
- unsigned int cpu;
- @@ -548,9 +539,11 @@
- continue;
- for_each_possible_cpu(cpu) {
- void *start = per_cpu_ptr(mod->percpu, cpu);
- + void *va = (void *)addr;
-
- - if ((void *)addr >= start &&
- - (void *)addr < start + mod->percpu_size) {
- + if (va >= start && va < start + mod->percpu_size) {
- + if (can_addr)
- + *can_addr = (unsigned long) (va - start);
- preempt_enable();
- return true;
- }
- @@ -561,6 +554,20 @@
- return false;
- }
-
- +/**
- + * is_module_percpu_address - test whether address is from module static percpu
- + * @addr: address to test
- + *
- + * Test whether @addr belongs to module static percpu area.
- + *
- + * RETURNS:
- + * %true if @addr is from module static percpu area
- + */
- +bool is_module_percpu_address(unsigned long addr)
- +{
- + return __is_module_percpu_address(addr, NULL);
- +}
- +
- #else /* ... !CONFIG_SMP */
-
- static inline void __percpu *mod_percpu(struct module *mod)
- @@ -591,6 +598,11 @@
- {
- return false;
- }
- +
- +bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr)
- +{
- + return false;
- +}
-
- #endif /* CONFIG_SMP */
-
- diff -Nur linux-4.1.39.orig/kernel/panic.c linux-4.1.39/kernel/panic.c
- --- linux-4.1.39.orig/kernel/panic.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/panic.c 2017-04-18 17:56:30.625397596 +0200
- @@ -399,9 +399,11 @@
-
- static int init_oops_id(void)
- {
- +#ifndef CONFIG_PREEMPT_RT_FULL
- if (!oops_id)
- get_random_bytes(&oops_id, sizeof(oops_id));
- else
- +#endif
- oops_id++;
-
- return 0;
- diff -Nur linux-4.1.39.orig/kernel/power/hibernate.c linux-4.1.39/kernel/power/hibernate.c
- --- linux-4.1.39.orig/kernel/power/hibernate.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/power/hibernate.c 2017-04-18 17:56:30.625397596 +0200
- @@ -285,6 +285,8 @@
-
- local_irq_disable();
-
- + system_state = SYSTEM_SUSPEND;
- +
- error = syscore_suspend();
- if (error) {
- printk(KERN_ERR "PM: Some system devices failed to power down, "
- @@ -314,6 +316,7 @@
- syscore_resume();
-
- Enable_irqs:
- + system_state = SYSTEM_RUNNING;
- local_irq_enable();
-
- Enable_cpus:
- @@ -437,6 +440,7 @@
- goto Enable_cpus;
-
- local_irq_disable();
- + system_state = SYSTEM_SUSPEND;
-
- error = syscore_suspend();
- if (error)
- @@ -470,6 +474,7 @@
- syscore_resume();
-
- Enable_irqs:
- + system_state = SYSTEM_RUNNING;
- local_irq_enable();
-
- Enable_cpus:
- @@ -555,6 +560,7 @@
- goto Platform_finish;
-
- local_irq_disable();
- + system_state = SYSTEM_SUSPEND;
- syscore_suspend();
- if (pm_wakeup_pending()) {
- error = -EAGAIN;
- @@ -567,6 +573,7 @@
-
- Power_up:
- syscore_resume();
- + system_state = SYSTEM_RUNNING;
- local_irq_enable();
- enable_nonboot_cpus();
-
- diff -Nur linux-4.1.39.orig/kernel/power/suspend.c linux-4.1.39/kernel/power/suspend.c
- --- linux-4.1.39.orig/kernel/power/suspend.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/power/suspend.c 2017-04-18 17:56:30.625397596 +0200
- @@ -356,6 +356,8 @@
- arch_suspend_disable_irqs();
- BUG_ON(!irqs_disabled());
-
- + system_state = SYSTEM_SUSPEND;
- +
- error = syscore_suspend();
- if (!error) {
- *wakeup = pm_wakeup_pending();
- @@ -370,6 +372,8 @@
- syscore_resume();
- }
-
- + system_state = SYSTEM_RUNNING;
- +
- arch_suspend_enable_irqs();
- BUG_ON(irqs_disabled());
-
- diff -Nur linux-4.1.39.orig/kernel/printk/printk.c linux-4.1.39/kernel/printk/printk.c
- --- linux-4.1.39.orig/kernel/printk/printk.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/printk/printk.c 2017-04-18 17:56:30.625397596 +0200
- @@ -1163,6 +1163,7 @@
- {
- char *text;
- int len = 0;
- + int attempts = 0;
-
- text = kmalloc(LOG_LINE_MAX + PREFIX_MAX, GFP_KERNEL);
- if (!text)
- @@ -1174,7 +1175,14 @@
- u64 seq;
- u32 idx;
- enum log_flags prev;
- -
- + int num_msg;
- +try_again:
- + attempts++;
- + if (attempts > 10) {
- + len = -EBUSY;
- + goto out;
- + }
- + num_msg = 0;
- if (clear_seq < log_first_seq) {
- /* messages are gone, move to first available one */
- clear_seq = log_first_seq;
- @@ -1195,6 +1203,14 @@
- prev = msg->flags;
- idx = log_next(idx);
- seq++;
- + num_msg++;
- + if (num_msg > 5) {
- + num_msg = 0;
- + raw_spin_unlock_irq(&logbuf_lock);
- + raw_spin_lock_irq(&logbuf_lock);
- + if (clear_seq < log_first_seq)
- + goto try_again;
- + }
- }
-
- /* move first record forward until length fits into the buffer */
- @@ -1208,6 +1224,14 @@
- prev = msg->flags;
- idx = log_next(idx);
- seq++;
- + num_msg++;
- + if (num_msg > 5) {
- + num_msg = 0;
- + raw_spin_unlock_irq(&logbuf_lock);
- + raw_spin_lock_irq(&logbuf_lock);
- + if (clear_seq < log_first_seq)
- + goto try_again;
- + }
- }
-
- /* last message fitting into this dump */
- @@ -1248,6 +1272,7 @@
- clear_seq = log_next_seq;
- clear_idx = log_next_idx;
- }
- +out:
- raw_spin_unlock_irq(&logbuf_lock);
-
- kfree(text);
- @@ -1401,6 +1426,12 @@
- if (!console_drivers)
- return;
-
- + if (IS_ENABLED(CONFIG_PREEMPT_RT_BASE)) {
- + if (in_irq() || in_nmi())
- + return;
- + }
- +
- + migrate_disable();
- for_each_console(con) {
- if (exclusive_console && con != exclusive_console)
- continue;
- @@ -1413,6 +1444,7 @@
- continue;
- con->write(con, text, len);
- }
- + migrate_enable();
- }
-
- /*
- @@ -1473,6 +1505,15 @@
- static int console_trylock_for_printk(void)
- {
- unsigned int cpu = smp_processor_id();
- +#ifdef CONFIG_PREEMPT_RT_FULL
- + int lock = !early_boot_irqs_disabled && (preempt_count() == 0) &&
- + !irqs_disabled();
- +#else
- + int lock = 1;
- +#endif
- +
- + if (!lock)
- + return 0;
-
- if (!console_trylock())
- return 0;
- @@ -1607,6 +1648,62 @@
- return textlen;
- }
-
- +#ifdef CONFIG_EARLY_PRINTK
- +struct console *early_console;
- +
- +static void early_vprintk(const char *fmt, va_list ap)
- +{
- + if (early_console) {
- + char buf[512];
- + int n = vscnprintf(buf, sizeof(buf), fmt, ap);
- +
- + early_console->write(early_console, buf, n);
- + }
- +}
- +
- +asmlinkage void early_printk(const char *fmt, ...)
- +{
- + va_list ap;
- +
- + va_start(ap, fmt);
- + early_vprintk(fmt, ap);
- + va_end(ap);
- +}
- +
- +/*
- + * This is independent of any log levels - a global
- + * kill switch that turns off all of printk.
- + *
- + * Used by the NMI watchdog if early-printk is enabled.
- + */
- +static bool __read_mostly printk_killswitch;
- +
- +static int __init force_early_printk_setup(char *str)
- +{
- + printk_killswitch = true;
- + return 0;
- +}
- +early_param("force_early_printk", force_early_printk_setup);
- +
- +void printk_kill(void)
- +{
- + printk_killswitch = true;
- +}
- +
- +static int forced_early_printk(const char *fmt, va_list ap)
- +{
- + if (!printk_killswitch)
- + return 0;
- + early_vprintk(fmt, ap);
- + return 1;
- +}
- +#else
- +static inline int forced_early_printk(const char *fmt, va_list ap)
- +{
- + return 0;
- +}
- +#endif
- +
- asmlinkage int vprintk_emit(int facility, int level,
- const char *dict, size_t dictlen,
- const char *fmt, va_list args)
- @@ -1623,6 +1720,13 @@
- /* cpu currently holding logbuf_lock in this function */
- static unsigned int logbuf_cpu = UINT_MAX;
-
- + /*
- + * Fall back to early_printk if a debugging subsystem has
- + * killed printk output
- + */
- + if (unlikely(forced_early_printk(fmt, args)))
- + return 1;
- +
- if (level == LOGLEVEL_SCHED) {
- level = LOGLEVEL_DEFAULT;
- in_sched = true;
- @@ -1764,8 +1868,7 @@
- * console_sem which would prevent anyone from printing to
- * console
- */
- - preempt_disable();
- -
- + migrate_disable();
- /*
- * Try to acquire and then immediately release the console
- * semaphore. The release will print out buffers and wake up
- @@ -1773,7 +1876,7 @@
- */
- if (console_trylock_for_printk())
- console_unlock();
- - preempt_enable();
- + migrate_enable();
- lockdep_on();
- }
-
- @@ -1902,26 +2005,6 @@
-
- #endif /* CONFIG_PRINTK */
-
- -#ifdef CONFIG_EARLY_PRINTK
- -struct console *early_console;
- -
- -asmlinkage __visible void early_printk(const char *fmt, ...)
- -{
- - va_list ap;
- - char buf[512];
- - int n;
- -
- - if (!early_console)
- - return;
- -
- - va_start(ap, fmt);
- - n = vscnprintf(buf, sizeof(buf), fmt, ap);
- - va_end(ap);
- -
- - early_console->write(early_console, buf, n);
- -}
- -#endif
- -
- static int __add_preferred_console(char *name, int idx, char *options,
- char *brl_options)
- {
- @@ -2143,11 +2226,16 @@
- goto out;
-
- len = cont_print_text(text, size);
- +#ifndef CONFIG_PREEMPT_RT_FULL
- raw_spin_unlock(&logbuf_lock);
- stop_critical_timings();
- call_console_drivers(cont.level, text, len);
- start_critical_timings();
- local_irq_restore(flags);
- +#else
- + raw_spin_unlock_irqrestore(&logbuf_lock, flags);
- + call_console_drivers(cont.level, text, len);
- +#endif
- return;
- out:
- raw_spin_unlock_irqrestore(&logbuf_lock, flags);
- @@ -2246,12 +2334,17 @@
- console_idx = log_next(console_idx);
- console_seq++;
- console_prev = msg->flags;
- +#ifdef CONFIG_PREEMPT_RT_FULL
- + raw_spin_unlock_irqrestore(&logbuf_lock, flags);
- + call_console_drivers(level, text, len);
- +#else
- raw_spin_unlock(&logbuf_lock);
-
- stop_critical_timings(); /* don't trace print latency */
- call_console_drivers(level, text, len);
- start_critical_timings();
- local_irq_restore(flags);
- +#endif
-
- if (do_cond_resched)
- cond_resched();
- @@ -2304,6 +2397,11 @@
- {
- struct console *c;
-
- + if (IS_ENABLED(CONFIG_PREEMPT_RT_BASE)) {
- + if (in_irq() || in_nmi())
- + return;
- + }
- +
- /*
- * console_unblank can no longer be called in interrupt context unless
- * oops_in_progress is set to 1..
- diff -Nur linux-4.1.39.orig/kernel/ptrace.c linux-4.1.39/kernel/ptrace.c
- --- linux-4.1.39.orig/kernel/ptrace.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/ptrace.c 2017-04-18 17:56:30.625397596 +0200
- @@ -137,7 +137,14 @@
-
- spin_lock_irq(&task->sighand->siglock);
- if (task_is_traced(task) && !__fatal_signal_pending(task)) {
- - task->state = __TASK_TRACED;
- + unsigned long flags;
- +
- + raw_spin_lock_irqsave(&task->pi_lock, flags);
- + if (task->state & __TASK_TRACED)
- + task->state = __TASK_TRACED;
- + else
- + task->saved_state = __TASK_TRACED;
- + raw_spin_unlock_irqrestore(&task->pi_lock, flags);
- ret = true;
- }
- spin_unlock_irq(&task->sighand->siglock);
- diff -Nur linux-4.1.39.orig/kernel/rcu/rcutorture.c linux-4.1.39/kernel/rcu/rcutorture.c
- --- linux-4.1.39.orig/kernel/rcu/rcutorture.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/rcu/rcutorture.c 2017-04-18 17:56:30.625397596 +0200
- @@ -389,6 +389,7 @@
- .name = "rcu"
- };
-
- +#ifndef CONFIG_PREEMPT_RT_FULL
- /*
- * Definitions for rcu_bh torture testing.
- */
- @@ -428,6 +429,12 @@
- .name = "rcu_bh"
- };
-
- +#else
- +static struct rcu_torture_ops rcu_bh_ops = {
- + .ttype = INVALID_RCU_FLAVOR,
- +};
- +#endif
- +
- /*
- * Don't even think about trying any of these in real life!!!
- * The names includes "busted", and they really means it!
- diff -Nur linux-4.1.39.orig/kernel/rcu/tree.c linux-4.1.39/kernel/rcu/tree.c
- --- linux-4.1.39.orig/kernel/rcu/tree.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/rcu/tree.c 2017-04-18 17:56:30.625397596 +0200
- @@ -56,6 +56,11 @@
- #include <linux/random.h>
- #include <linux/ftrace_event.h>
- #include <linux/suspend.h>
- +#include <linux/delay.h>
- +#include <linux/gfp.h>
- +#include <linux/oom.h>
- +#include <linux/smpboot.h>
- +#include "../time/tick-internal.h"
-
- #include "tree.h"
- #include "rcu.h"
- @@ -220,6 +225,19 @@
- }
- }
-
- +#ifdef CONFIG_PREEMPT_RT_FULL
- +static void rcu_preempt_qs(void);
- +
- +void rcu_bh_qs(void)
- +{
- + unsigned long flags;
- +
- + /* Callers to this function, rcu_preempt_qs(), must disable irqs. */
- + local_irq_save(flags);
- + rcu_preempt_qs();
- + local_irq_restore(flags);
- +}
- +#else
- void rcu_bh_qs(void)
- {
- if (!__this_cpu_read(rcu_bh_data.passed_quiesce)) {
- @@ -229,6 +247,7 @@
- __this_cpu_write(rcu_bh_data.passed_quiesce, 1);
- }
- }
- +#endif
-
- static DEFINE_PER_CPU(int, rcu_sched_qs_mask);
-
- @@ -404,6 +423,7 @@
- }
- EXPORT_SYMBOL_GPL(rcu_batches_completed_sched);
-
- +#ifndef CONFIG_PREEMPT_RT_FULL
- /*
- * Return the number of RCU BH batches completed thus far for debug & stats.
- */
- @@ -431,6 +451,13 @@
- }
- EXPORT_SYMBOL_GPL(rcu_bh_force_quiescent_state);
-
- +#else
- +void rcu_force_quiescent_state(void)
- +{
- +}
- +EXPORT_SYMBOL_GPL(rcu_force_quiescent_state);
- +#endif
- +
- /*
- * Force a quiescent state for RCU-sched.
- */
- @@ -1545,7 +1572,7 @@
- !ACCESS_ONCE(rsp->gp_flags) ||
- !rsp->gp_kthread)
- return;
- - wake_up(&rsp->gp_wq);
- + swait_wake(&rsp->gp_wq);
- }
-
- /*
- @@ -1986,7 +2013,7 @@
- ACCESS_ONCE(rsp->gpnum),
- TPS("reqwait"));
- rsp->gp_state = RCU_GP_WAIT_GPS;
- - wait_event_interruptible(rsp->gp_wq,
- + swait_event_interruptible(rsp->gp_wq,
- ACCESS_ONCE(rsp->gp_flags) &
- RCU_GP_FLAG_INIT);
- /* Locking provides needed memory barrier. */
- @@ -2015,7 +2042,7 @@
- ACCESS_ONCE(rsp->gpnum),
- TPS("fqswait"));
- rsp->gp_state = RCU_GP_WAIT_FQS;
- - ret = wait_event_interruptible_timeout(rsp->gp_wq,
- + ret = swait_event_interruptible_timeout(rsp->gp_wq,
- ((gf = ACCESS_ONCE(rsp->gp_flags)) &
- RCU_GP_FLAG_FQS) ||
- (!ACCESS_ONCE(rnp->qsmask) &&
- @@ -2860,18 +2887,17 @@
- /*
- * Do RCU core processing for the current CPU.
- */
- -static void rcu_process_callbacks(struct softirq_action *unused)
- +static void rcu_process_callbacks(void)
- {
- struct rcu_state *rsp;
-
- if (cpu_is_offline(smp_processor_id()))
- return;
- - trace_rcu_utilization(TPS("Start RCU core"));
- for_each_rcu_flavor(rsp)
- __rcu_process_callbacks(rsp);
- - trace_rcu_utilization(TPS("End RCU core"));
- }
-
- +static DEFINE_PER_CPU(struct task_struct *, rcu_cpu_kthread_task);
- /*
- * Schedule RCU callback invocation. If the specified type of RCU
- * does not support RCU priority boosting, just do a direct call,
- @@ -2883,18 +2909,105 @@
- {
- if (unlikely(!ACCESS_ONCE(rcu_scheduler_fully_active)))
- return;
- - if (likely(!rsp->boost)) {
- - rcu_do_batch(rsp, rdp);
- + rcu_do_batch(rsp, rdp);
- +}
- +
- +static void rcu_wake_cond(struct task_struct *t, int status)
- +{
- + /*
- + * If the thread is yielding, only wake it when this
- + * is invoked from idle
- + */
- + if (t && (status != RCU_KTHREAD_YIELDING || is_idle_task(current)))
- + wake_up_process(t);
- +}
- +
- +/*
- + * Wake up this CPU's rcuc kthread to do RCU core processing.
- + */
- +static void invoke_rcu_core(void)
- +{
- + unsigned long flags;
- + struct task_struct *t;
- +
- + if (!cpu_online(smp_processor_id()))
- return;
- + local_irq_save(flags);
- + __this_cpu_write(rcu_cpu_has_work, 1);
- + t = __this_cpu_read(rcu_cpu_kthread_task);
- + if (t != NULL && current != t)
- + rcu_wake_cond(t, __this_cpu_read(rcu_cpu_kthread_status));
- + local_irq_restore(flags);
- +}
- +
- +static void rcu_cpu_kthread_park(unsigned int cpu)
- +{
- + per_cpu(rcu_cpu_kthread_status, cpu) = RCU_KTHREAD_OFFCPU;
- +}
- +
- +static int rcu_cpu_kthread_should_run(unsigned int cpu)
- +{
- + return __this_cpu_read(rcu_cpu_has_work);
- +}
- +
- +/*
- + * Per-CPU kernel thread that invokes RCU callbacks. This replaces the
- + * RCU softirq used in flavors and configurations of RCU that do not
- + * support RCU priority boosting.
- + */
- +static void rcu_cpu_kthread(unsigned int cpu)
- +{
- + unsigned int *statusp = this_cpu_ptr(&rcu_cpu_kthread_status);
- + char work, *workp = this_cpu_ptr(&rcu_cpu_has_work);
- + int spincnt;
- +
- + for (spincnt = 0; spincnt < 10; spincnt++) {
- + trace_rcu_utilization(TPS("Start CPU kthread@rcu_wait"));
- + local_bh_disable();
- + *statusp = RCU_KTHREAD_RUNNING;
- + this_cpu_inc(rcu_cpu_kthread_loops);
- + local_irq_disable();
- + work = *workp;
- + *workp = 0;
- + local_irq_enable();
- + if (work)
- + rcu_process_callbacks();
- + local_bh_enable();
- + if (*workp == 0) {
- + trace_rcu_utilization(TPS("End CPU kthread@rcu_wait"));
- + *statusp = RCU_KTHREAD_WAITING;
- + return;
- + }
- }
- - invoke_rcu_callbacks_kthread();
- + *statusp = RCU_KTHREAD_YIELDING;
- + trace_rcu_utilization(TPS("Start CPU kthread@rcu_yield"));
- + schedule_timeout_interruptible(2);
- + trace_rcu_utilization(TPS("End CPU kthread@rcu_yield"));
- + *statusp = RCU_KTHREAD_WAITING;
- }
-
- -static void invoke_rcu_core(void)
- +static struct smp_hotplug_thread rcu_cpu_thread_spec = {
- + .store = &rcu_cpu_kthread_task,
- + .thread_should_run = rcu_cpu_kthread_should_run,
- + .thread_fn = rcu_cpu_kthread,
- + .thread_comm = "rcuc/%u",
- + .setup = rcu_cpu_kthread_setup,
- + .park = rcu_cpu_kthread_park,
- +};
- +
- +/*
- + * Spawn per-CPU RCU core processing kthreads.
- + */
- +static int __init rcu_spawn_core_kthreads(void)
- {
- - if (cpu_online(smp_processor_id()))
- - raise_softirq(RCU_SOFTIRQ);
- + int cpu;
- +
- + for_each_possible_cpu(cpu)
- + per_cpu(rcu_cpu_has_work, cpu) = 0;
- + BUG_ON(smpboot_register_percpu_thread(&rcu_cpu_thread_spec));
- + return 0;
- }
- +early_initcall(rcu_spawn_core_kthreads);
-
- /*
- * Handle any core-RCU processing required by a call_rcu() invocation.
- @@ -3040,6 +3153,7 @@
- }
- EXPORT_SYMBOL_GPL(call_rcu_sched);
-
- +#ifndef CONFIG_PREEMPT_RT_FULL
- /*
- * Queue an RCU callback for invocation after a quicker grace period.
- */
- @@ -3048,6 +3162,7 @@
- __call_rcu(head, func, &rcu_bh_state, -1, 0);
- }
- EXPORT_SYMBOL_GPL(call_rcu_bh);
- +#endif
-
- /*
- * Queue an RCU callback for lazy invocation after a grace period.
- @@ -3139,6 +3254,7 @@
- }
- EXPORT_SYMBOL_GPL(synchronize_sched);
-
- +#ifndef CONFIG_PREEMPT_RT_FULL
- /**
- * synchronize_rcu_bh - wait until an rcu_bh grace period has elapsed.
- *
- @@ -3165,6 +3281,7 @@
- wait_rcu_gp(call_rcu_bh);
- }
- EXPORT_SYMBOL_GPL(synchronize_rcu_bh);
- +#endif
-
- /**
- * get_state_synchronize_rcu - Snapshot current RCU state
- @@ -3677,6 +3794,7 @@
- mutex_unlock(&rsp->barrier_mutex);
- }
-
- +#ifndef CONFIG_PREEMPT_RT_FULL
- /**
- * rcu_barrier_bh - Wait until all in-flight call_rcu_bh() callbacks complete.
- */
- @@ -3685,6 +3803,7 @@
- _rcu_barrier(&rcu_bh_state);
- }
- EXPORT_SYMBOL_GPL(rcu_barrier_bh);
- +#endif
-
- /**
- * rcu_barrier_sched - Wait for in-flight call_rcu_sched() callbacks.
- @@ -4021,7 +4140,7 @@
- }
- }
-
- - init_waitqueue_head(&rsp->gp_wq);
- + init_swait_head(&rsp->gp_wq);
- rnp = rsp->level[rcu_num_lvls - 1];
- for_each_possible_cpu(i) {
- while (i > rnp->grphi)
- @@ -4120,7 +4239,6 @@
- rcu_init_one(&rcu_bh_state, &rcu_bh_data);
- rcu_init_one(&rcu_sched_state, &rcu_sched_data);
- __rcu_init_preempt();
- - open_softirq(RCU_SOFTIRQ, rcu_process_callbacks);
-
- /*
- * We don't need protection against CPU-hotplug here because
- diff -Nur linux-4.1.39.orig/kernel/rcu/tree.h linux-4.1.39/kernel/rcu/tree.h
- --- linux-4.1.39.orig/kernel/rcu/tree.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/rcu/tree.h 2017-04-18 17:56:30.629397751 +0200
- @@ -27,6 +27,7 @@
- #include <linux/threads.h>
- #include <linux/cpumask.h>
- #include <linux/seqlock.h>
- +#include <linux/wait-simple.h>
-
- /*
- * Define shape of hierarchy based on NR_CPUS, CONFIG_RCU_FANOUT, and
- @@ -210,7 +211,7 @@
- /* This can happen due to race conditions. */
- #endif /* #ifdef CONFIG_RCU_BOOST */
- #ifdef CONFIG_RCU_NOCB_CPU
- - wait_queue_head_t nocb_gp_wq[2];
- + struct swait_head nocb_gp_wq[2];
- /* Place for rcu_nocb_kthread() to wait GP. */
- #endif /* #ifdef CONFIG_RCU_NOCB_CPU */
- int need_future_gp[2];
- @@ -349,7 +350,7 @@
- atomic_long_t nocb_q_count_lazy; /* invocation (all stages). */
- struct rcu_head *nocb_follower_head; /* CBs ready to invoke. */
- struct rcu_head **nocb_follower_tail;
- - wait_queue_head_t nocb_wq; /* For nocb kthreads to sleep on. */
- + struct swait_head nocb_wq; /* For nocb kthreads to sleep on. */
- struct task_struct *nocb_kthread;
- int nocb_defer_wakeup; /* Defer wakeup of nocb_kthread. */
-
- @@ -438,7 +439,7 @@
- unsigned long gpnum; /* Current gp number. */
- unsigned long completed; /* # of last completed gp. */
- struct task_struct *gp_kthread; /* Task for grace periods. */
- - wait_queue_head_t gp_wq; /* Where GP task waits. */
- + struct swait_head gp_wq; /* Where GP task waits. */
- short gp_flags; /* Commands for GP task. */
- short gp_state; /* GP kthread sleep state. */
-
- @@ -529,12 +530,10 @@
- DECLARE_PER_CPU(struct rcu_data, rcu_preempt_data);
- #endif /* #ifdef CONFIG_PREEMPT_RCU */
-
- -#ifdef CONFIG_RCU_BOOST
- DECLARE_PER_CPU(unsigned int, rcu_cpu_kthread_status);
- DECLARE_PER_CPU(int, rcu_cpu_kthread_cpu);
- DECLARE_PER_CPU(unsigned int, rcu_cpu_kthread_loops);
- DECLARE_PER_CPU(char, rcu_cpu_has_work);
- -#endif /* #ifdef CONFIG_RCU_BOOST */
-
- #ifndef RCU_TREE_NONCORE
-
- @@ -553,10 +552,9 @@
- static void __init __rcu_init_preempt(void);
- static void rcu_initiate_boost(struct rcu_node *rnp, unsigned long flags);
- static void rcu_preempt_boost_start_gp(struct rcu_node *rnp);
- -static void invoke_rcu_callbacks_kthread(void);
- static bool rcu_is_callbacks_kthread(void);
- +static void rcu_cpu_kthread_setup(unsigned int cpu);
- #ifdef CONFIG_RCU_BOOST
- -static void rcu_preempt_do_callbacks(void);
- static int rcu_spawn_one_boost_kthread(struct rcu_state *rsp,
- struct rcu_node *rnp);
- #endif /* #ifdef CONFIG_RCU_BOOST */
- diff -Nur linux-4.1.39.orig/kernel/rcu/tree_plugin.h linux-4.1.39/kernel/rcu/tree_plugin.h
- --- linux-4.1.39.orig/kernel/rcu/tree_plugin.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/rcu/tree_plugin.h 2017-04-18 17:56:30.629397751 +0200
- @@ -24,27 +24,20 @@
- * Paul E. McKenney <paulmck@linux.vnet.ibm.com>
- */
-
- -#include <linux/delay.h>
- -#include <linux/gfp.h>
- -#include <linux/oom.h>
- -#include <linux/smpboot.h>
- -#include "../time/tick-internal.h"
- -
- #ifdef CONFIG_RCU_BOOST
-
- #include "../locking/rtmutex_common.h"
-
- +#endif /* #ifdef CONFIG_RCU_BOOST */
- +
- /*
- * Control variables for per-CPU and per-rcu_node kthreads. These
- * handle all flavors of RCU.
- */
- -static DEFINE_PER_CPU(struct task_struct *, rcu_cpu_kthread_task);
- DEFINE_PER_CPU(unsigned int, rcu_cpu_kthread_status);
- DEFINE_PER_CPU(unsigned int, rcu_cpu_kthread_loops);
- DEFINE_PER_CPU(char, rcu_cpu_has_work);
-
- -#endif /* #ifdef CONFIG_RCU_BOOST */
- -
- #ifdef CONFIG_RCU_NOCB_CPU
- static cpumask_var_t rcu_nocb_mask; /* CPUs to have callbacks offloaded. */
- static bool have_rcu_nocb_mask; /* Was rcu_nocb_mask allocated? */
- @@ -291,7 +284,7 @@
- }
-
- /* Hardware IRQ handlers cannot block, complain if they get here. */
- - if (in_irq() || in_serving_softirq()) {
- + if (preempt_count() & (HARDIRQ_MASK | SOFTIRQ_OFFSET)) {
- lockdep_rcu_suspicious(__FILE__, __LINE__,
- "rcu_read_unlock() from irq or softirq with blocking in critical section!!!\n");
- pr_alert("->rcu_read_unlock_special: %#x (b: %d, nq: %d)\n",
- @@ -496,15 +489,6 @@
- t->rcu_read_unlock_special.b.need_qs = true;
- }
-
- -#ifdef CONFIG_RCU_BOOST
- -
- -static void rcu_preempt_do_callbacks(void)
- -{
- - rcu_do_batch(&rcu_preempt_state, this_cpu_ptr(&rcu_preempt_data));
- -}
- -
- -#endif /* #ifdef CONFIG_RCU_BOOST */
- -
- /*
- * Queue a preemptible-RCU callback for invocation after a grace period.
- */
- @@ -939,6 +923,19 @@
-
- #endif /* #else #ifdef CONFIG_PREEMPT_RCU */
-
- +/*
- + * If boosting, set rcuc kthreads to realtime priority.
- + */
- +static void rcu_cpu_kthread_setup(unsigned int cpu)
- +{
- +#ifdef CONFIG_RCU_BOOST
- + struct sched_param sp;
- +
- + sp.sched_priority = kthread_prio;
- + sched_setscheduler_nocheck(current, SCHED_FIFO, &sp);
- +#endif /* #ifdef CONFIG_RCU_BOOST */
- +}
- +
- #ifdef CONFIG_RCU_BOOST
-
- #include "../locking/rtmutex_common.h"
- @@ -970,16 +967,6 @@
-
- #endif /* #else #ifdef CONFIG_RCU_TRACE */
-
- -static void rcu_wake_cond(struct task_struct *t, int status)
- -{
- - /*
- - * If the thread is yielding, only wake it when this
- - * is invoked from idle
- - */
- - if (status != RCU_KTHREAD_YIELDING || is_idle_task(current))
- - wake_up_process(t);
- -}
- -
- /*
- * Carry out RCU priority boosting on the task indicated by ->exp_tasks
- * or ->boost_tasks, advancing the pointer to the next task in the
- @@ -1125,23 +1112,6 @@
- }
-
- /*
- - * Wake up the per-CPU kthread to invoke RCU callbacks.
- - */
- -static void invoke_rcu_callbacks_kthread(void)
- -{
- - unsigned long flags;
- -
- - local_irq_save(flags);
- - __this_cpu_write(rcu_cpu_has_work, 1);
- - if (__this_cpu_read(rcu_cpu_kthread_task) != NULL &&
- - current != __this_cpu_read(rcu_cpu_kthread_task)) {
- - rcu_wake_cond(__this_cpu_read(rcu_cpu_kthread_task),
- - __this_cpu_read(rcu_cpu_kthread_status));
- - }
- - local_irq_restore(flags);
- -}
- -
- -/*
- * Is the current CPU running the RCU-callbacks kthread?
- * Caller must have preemption disabled.
- */
- @@ -1196,67 +1166,6 @@
- return 0;
- }
-
- -static void rcu_kthread_do_work(void)
- -{
- - rcu_do_batch(&rcu_sched_state, this_cpu_ptr(&rcu_sched_data));
- - rcu_do_batch(&rcu_bh_state, this_cpu_ptr(&rcu_bh_data));
- - rcu_preempt_do_callbacks();
- -}
- -
- -static void rcu_cpu_kthread_setup(unsigned int cpu)
- -{
- - struct sched_param sp;
- -
- - sp.sched_priority = kthread_prio;
- - sched_setscheduler_nocheck(current, SCHED_FIFO, &sp);
- -}
- -
- -static void rcu_cpu_kthread_park(unsigned int cpu)
- -{
- - per_cpu(rcu_cpu_kthread_status, cpu) = RCU_KTHREAD_OFFCPU;
- -}
- -
- -static int rcu_cpu_kthread_should_run(unsigned int cpu)
- -{
- - return __this_cpu_read(rcu_cpu_has_work);
- -}
- -
- -/*
- - * Per-CPU kernel thread that invokes RCU callbacks. This replaces the
- - * RCU softirq used in flavors and configurations of RCU that do not
- - * support RCU priority boosting.
- - */
- -static void rcu_cpu_kthread(unsigned int cpu)
- -{
- - unsigned int *statusp = this_cpu_ptr(&rcu_cpu_kthread_status);
- - char work, *workp = this_cpu_ptr(&rcu_cpu_has_work);
- - int spincnt;
- -
- - for (spincnt = 0; spincnt < 10; spincnt++) {
- - trace_rcu_utilization(TPS("Start CPU kthread@rcu_wait"));
- - local_bh_disable();
- - *statusp = RCU_KTHREAD_RUNNING;
- - this_cpu_inc(rcu_cpu_kthread_loops);
- - local_irq_disable();
- - work = *workp;
- - *workp = 0;
- - local_irq_enable();
- - if (work)
- - rcu_kthread_do_work();
- - local_bh_enable();
- - if (*workp == 0) {
- - trace_rcu_utilization(TPS("End CPU kthread@rcu_wait"));
- - *statusp = RCU_KTHREAD_WAITING;
- - return;
- - }
- - }
- - *statusp = RCU_KTHREAD_YIELDING;
- - trace_rcu_utilization(TPS("Start CPU kthread@rcu_yield"));
- - schedule_timeout_interruptible(2);
- - trace_rcu_utilization(TPS("End CPU kthread@rcu_yield"));
- - *statusp = RCU_KTHREAD_WAITING;
- -}
- -
- /*
- * Set the per-rcu_node kthread's affinity to cover all CPUs that are
- * served by the rcu_node in question. The CPU hotplug lock is still
- @@ -1286,26 +1195,12 @@
- free_cpumask_var(cm);
- }
-
- -static struct smp_hotplug_thread rcu_cpu_thread_spec = {
- - .store = &rcu_cpu_kthread_task,
- - .thread_should_run = rcu_cpu_kthread_should_run,
- - .thread_fn = rcu_cpu_kthread,
- - .thread_comm = "rcuc/%u",
- - .setup = rcu_cpu_kthread_setup,
- - .park = rcu_cpu_kthread_park,
- -};
- -
- /*
- * Spawn boost kthreads -- called as soon as the scheduler is running.
- */
- static void __init rcu_spawn_boost_kthreads(void)
- {
- struct rcu_node *rnp;
- - int cpu;
- -
- - for_each_possible_cpu(cpu)
- - per_cpu(rcu_cpu_has_work, cpu) = 0;
- - BUG_ON(smpboot_register_percpu_thread(&rcu_cpu_thread_spec));
- rcu_for_each_leaf_node(rcu_state_p, rnp)
- (void)rcu_spawn_one_boost_kthread(rcu_state_p, rnp);
- }
- @@ -1328,11 +1223,6 @@
- raw_spin_unlock_irqrestore(&rnp->lock, flags);
- }
-
- -static void invoke_rcu_callbacks_kthread(void)
- -{
- - WARN_ON_ONCE(1);
- -}
- -
- static bool rcu_is_callbacks_kthread(void)
- {
- return false;
- @@ -1356,7 +1246,7 @@
-
- #endif /* #else #ifdef CONFIG_RCU_BOOST */
-
- -#if !defined(CONFIG_RCU_FAST_NO_HZ)
- +#if !defined(CONFIG_RCU_FAST_NO_HZ) || defined(CONFIG_PREEMPT_RT_FULL)
-
- /*
- * Check to see if any future RCU-related work will need to be done
- @@ -1374,7 +1264,9 @@
- return rcu_cpu_has_callbacks(NULL);
- }
- #endif /* #ifndef CONFIG_RCU_NOCB_CPU_ALL */
- +#endif /* !defined(CONFIG_RCU_FAST_NO_HZ) || defined(CONFIG_PREEMPT_RT_FULL) */
-
- +#if !defined(CONFIG_RCU_FAST_NO_HZ)
- /*
- * Because we do not have RCU_FAST_NO_HZ, don't bother cleaning up
- * after it.
- @@ -1472,6 +1364,8 @@
- return cbs_ready;
- }
-
- +#ifndef CONFIG_PREEMPT_RT_FULL
- +
- /*
- * Allow the CPU to enter dyntick-idle mode unless it has callbacks ready
- * to invoke. If the CPU has callbacks, try to advance them. Tell the
- @@ -1512,7 +1406,7 @@
- return 0;
- }
- #endif /* #ifndef CONFIG_RCU_NOCB_CPU_ALL */
- -
- +#endif /* #ifndef CONFIG_PREEMPT_RT_FULL */
- /*
- * Prepare a CPU for idle from an RCU perspective. The first major task
- * is to sense whether nohz mode has been enabled or disabled via sysfs.
- @@ -1859,7 +1753,7 @@
- */
- static void rcu_nocb_gp_cleanup(struct rcu_state *rsp, struct rcu_node *rnp)
- {
- - wake_up_all(&rnp->nocb_gp_wq[rnp->completed & 0x1]);
- + swait_wake_all(&rnp->nocb_gp_wq[rnp->completed & 0x1]);
- }
-
- /*
- @@ -1877,8 +1771,8 @@
-
- static void rcu_init_one_nocb(struct rcu_node *rnp)
- {
- - init_waitqueue_head(&rnp->nocb_gp_wq[0]);
- - init_waitqueue_head(&rnp->nocb_gp_wq[1]);
- + init_swait_head(&rnp->nocb_gp_wq[0]);
- + init_swait_head(&rnp->nocb_gp_wq[1]);
- }
-
- #ifndef CONFIG_RCU_NOCB_CPU_ALL
- @@ -1903,7 +1797,7 @@
- if (ACCESS_ONCE(rdp_leader->nocb_leader_sleep) || force) {
- /* Prior smp_mb__after_atomic() orders against prior enqueue. */
- ACCESS_ONCE(rdp_leader->nocb_leader_sleep) = false;
- - wake_up(&rdp_leader->nocb_wq);
- + swait_wake(&rdp_leader->nocb_wq);
- }
- }
-
- @@ -2116,7 +2010,7 @@
- */
- trace_rcu_future_gp(rnp, rdp, c, TPS("StartWait"));
- for (;;) {
- - wait_event_interruptible(
- + swait_event_interruptible(
- rnp->nocb_gp_wq[c & 0x1],
- (d = ULONG_CMP_GE(ACCESS_ONCE(rnp->completed), c)));
- if (likely(d))
- @@ -2144,7 +2038,7 @@
- /* Wait for callbacks to appear. */
- if (!rcu_nocb_poll) {
- trace_rcu_nocb_wake(my_rdp->rsp->name, my_rdp->cpu, "Sleep");
- - wait_event_interruptible(my_rdp->nocb_wq,
- + swait_event_interruptible(my_rdp->nocb_wq,
- !ACCESS_ONCE(my_rdp->nocb_leader_sleep));
- /* Memory barrier handled by smp_mb() calls below and repoll. */
- } else if (firsttime) {
- @@ -2219,7 +2113,7 @@
- * List was empty, wake up the follower.
- * Memory barriers supplied by atomic_long_add().
- */
- - wake_up(&rdp->nocb_wq);
- + swait_wake(&rdp->nocb_wq);
- }
- }
-
- @@ -2240,7 +2134,7 @@
- if (!rcu_nocb_poll) {
- trace_rcu_nocb_wake(rdp->rsp->name, rdp->cpu,
- "FollowerSleep");
- - wait_event_interruptible(rdp->nocb_wq,
- + swait_event_interruptible(rdp->nocb_wq,
- ACCESS_ONCE(rdp->nocb_follower_head));
- } else if (firsttime) {
- /* Don't drown trace log with "Poll"! */
- @@ -2399,7 +2293,7 @@
- static void __init rcu_boot_init_nocb_percpu_data(struct rcu_data *rdp)
- {
- rdp->nocb_tail = &rdp->nocb_head;
- - init_waitqueue_head(&rdp->nocb_wq);
- + init_swait_head(&rdp->nocb_wq);
- rdp->nocb_follower_tail = &rdp->nocb_follower_head;
- }
-
- diff -Nur linux-4.1.39.orig/kernel/rcu/update.c linux-4.1.39/kernel/rcu/update.c
- --- linux-4.1.39.orig/kernel/rcu/update.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/rcu/update.c 2017-04-18 17:56:30.629397751 +0200
- @@ -227,6 +227,7 @@
- }
- EXPORT_SYMBOL_GPL(rcu_read_lock_held);
-
- +#ifndef CONFIG_PREEMPT_RT_FULL
- /**
- * rcu_read_lock_bh_held() - might we be in RCU-bh read-side critical section?
- *
- @@ -253,6 +254,7 @@
- return in_softirq() || irqs_disabled();
- }
- EXPORT_SYMBOL_GPL(rcu_read_lock_bh_held);
- +#endif
-
- #endif /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */
-
- diff -Nur linux-4.1.39.orig/kernel/relay.c linux-4.1.39/kernel/relay.c
- --- linux-4.1.39.orig/kernel/relay.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/relay.c 2017-04-18 17:56:30.629397751 +0200
- @@ -339,6 +339,10 @@
- {
- struct rchan_buf *buf = (struct rchan_buf *)data;
- wake_up_interruptible(&buf->read_wait);
- + /*
- + * Stupid polling for now:
- + */
- + mod_timer(&buf->timer, jiffies + 1);
- }
-
- /**
- @@ -356,6 +360,7 @@
- init_waitqueue_head(&buf->read_wait);
- kref_init(&buf->kref);
- setup_timer(&buf->timer, wakeup_readers, (unsigned long)buf);
- + mod_timer(&buf->timer, jiffies + 1);
- } else
- del_timer_sync(&buf->timer);
-
- @@ -739,15 +744,6 @@
- else
- buf->early_bytes += buf->chan->subbuf_size -
- buf->padding[old_subbuf];
- - smp_mb();
- - if (waitqueue_active(&buf->read_wait))
- - /*
- - * Calling wake_up_interruptible() from here
- - * will deadlock if we happen to be logging
- - * from the scheduler (trying to re-grab
- - * rq->lock), so defer it.
- - */
- - mod_timer(&buf->timer, jiffies + 1);
- }
-
- old = buf->data;
- diff -Nur linux-4.1.39.orig/kernel/sched/completion.c linux-4.1.39/kernel/sched/completion.c
- --- linux-4.1.39.orig/kernel/sched/completion.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/sched/completion.c 2017-04-18 17:56:30.633397907 +0200
- @@ -30,10 +30,10 @@
- {
- unsigned long flags;
-
- - spin_lock_irqsave(&x->wait.lock, flags);
- + raw_spin_lock_irqsave(&x->wait.lock, flags);
- x->done++;
- - __wake_up_locked(&x->wait, TASK_NORMAL, 1);
- - spin_unlock_irqrestore(&x->wait.lock, flags);
- + __swait_wake_locked(&x->wait, TASK_NORMAL, 1);
- + raw_spin_unlock_irqrestore(&x->wait.lock, flags);
- }
- EXPORT_SYMBOL(complete);
-
- @@ -50,10 +50,10 @@
- {
- unsigned long flags;
-
- - spin_lock_irqsave(&x->wait.lock, flags);
- + raw_spin_lock_irqsave(&x->wait.lock, flags);
- x->done += UINT_MAX/2;
- - __wake_up_locked(&x->wait, TASK_NORMAL, 0);
- - spin_unlock_irqrestore(&x->wait.lock, flags);
- + __swait_wake_locked(&x->wait, TASK_NORMAL, 0);
- + raw_spin_unlock_irqrestore(&x->wait.lock, flags);
- }
- EXPORT_SYMBOL(complete_all);
-
- @@ -62,20 +62,20 @@
- long (*action)(long), long timeout, int state)
- {
- if (!x->done) {
- - DECLARE_WAITQUEUE(wait, current);
- + DEFINE_SWAITER(wait);
-
- - __add_wait_queue_tail_exclusive(&x->wait, &wait);
- + swait_prepare_locked(&x->wait, &wait);
- do {
- if (signal_pending_state(state, current)) {
- timeout = -ERESTARTSYS;
- break;
- }
- __set_current_state(state);
- - spin_unlock_irq(&x->wait.lock);
- + raw_spin_unlock_irq(&x->wait.lock);
- timeout = action(timeout);
- - spin_lock_irq(&x->wait.lock);
- + raw_spin_lock_irq(&x->wait.lock);
- } while (!x->done && timeout);
- - __remove_wait_queue(&x->wait, &wait);
- + swait_finish_locked(&x->wait, &wait);
- if (!x->done)
- return timeout;
- }
- @@ -89,9 +89,9 @@
- {
- might_sleep();
-
- - spin_lock_irq(&x->wait.lock);
- + raw_spin_lock_irq(&x->wait.lock);
- timeout = do_wait_for_common(x, action, timeout, state);
- - spin_unlock_irq(&x->wait.lock);
- + raw_spin_unlock_irq(&x->wait.lock);
- return timeout;
- }
-
- @@ -277,12 +277,12 @@
- if (!READ_ONCE(x->done))
- return 0;
-
- - spin_lock_irqsave(&x->wait.lock, flags);
- + raw_spin_lock_irqsave(&x->wait.lock, flags);
- if (!x->done)
- ret = 0;
- else
- x->done--;
- - spin_unlock_irqrestore(&x->wait.lock, flags);
- + raw_spin_unlock_irqrestore(&x->wait.lock, flags);
- return ret;
- }
- EXPORT_SYMBOL(try_wait_for_completion);
- @@ -311,7 +311,7 @@
- * after it's acquired the lock.
- */
- smp_rmb();
- - spin_unlock_wait(&x->wait.lock);
- + raw_spin_unlock_wait(&x->wait.lock);
- return true;
- }
- EXPORT_SYMBOL(completion_done);
- diff -Nur linux-4.1.39.orig/kernel/sched/core.c linux-4.1.39/kernel/sched/core.c
- --- linux-4.1.39.orig/kernel/sched/core.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/sched/core.c 2017-04-18 17:56:30.633397907 +0200
- @@ -282,7 +282,11 @@
- * Number of tasks to iterate in a single balance run.
- * Limited because this is done with IRQs disabled.
- */
- +#ifndef CONFIG_PREEMPT_RT_FULL
- const_debug unsigned int sysctl_sched_nr_migrate = 32;
- +#else
- +const_debug unsigned int sysctl_sched_nr_migrate = 8;
- +#endif
-
- /*
- * period over which we average the RT time consumption, measured
- @@ -461,6 +465,7 @@
-
- hrtimer_init(&rq->hrtick_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
- rq->hrtick_timer.function = hrtick;
- + rq->hrtick_timer.irqsafe = 1;
- }
- #else /* CONFIG_SCHED_HRTICK */
- static inline void hrtick_clear(struct rq *rq)
- @@ -541,6 +546,52 @@
- #endif
- #endif
-
- +void wake_q_add(struct wake_q_head *head, struct task_struct *task)
- +{
- + struct wake_q_node *node = &task->wake_q;
- +
- + /*
- + * Atomically grab the task, if ->wake_q is !nil already it means
- + * its already queued (either by us or someone else) and will get the
- + * wakeup due to that.
- + *
- + * This cmpxchg() implies a full barrier, which pairs with the write
- + * barrier implied by the wakeup in wake_up_list().
- + */
- + if (cmpxchg(&node->next, NULL, WAKE_Q_TAIL))
- + return;
- +
- + get_task_struct(task);
- +
- + /*
- + * The head is context local, there can be no concurrency.
- + */
- + *head->lastp = node;
- + head->lastp = &node->next;
- +}
- +
- +void wake_up_q(struct wake_q_head *head)
- +{
- + struct wake_q_node *node = head->first;
- +
- + while (node != WAKE_Q_TAIL) {
- + struct task_struct *task;
- +
- + task = container_of(node, struct task_struct, wake_q);
- + BUG_ON(!task);
- + /* task can safely be re-inserted now */
- + node = node->next;
- + task->wake_q.next = NULL;
- +
- + /*
- + * wake_up_process() implies a wmb() to pair with the queueing
- + * in wake_q_add() so as not to miss wakeups.
- + */
- + wake_up_process(task);
- + put_task_struct(task);
- + }
- +}
- +
- /*
- * resched_curr - mark rq's current task 'to be rescheduled now'.
- *
- @@ -572,6 +623,38 @@
- trace_sched_wake_idle_without_ipi(cpu);
- }
-
- +#ifdef CONFIG_PREEMPT_LAZY
- +void resched_curr_lazy(struct rq *rq)
- +{
- + struct task_struct *curr = rq->curr;
- + int cpu;
- +
- + if (!sched_feat(PREEMPT_LAZY)) {
- + resched_curr(rq);
- + return;
- + }
- +
- + lockdep_assert_held(&rq->lock);
- +
- + if (test_tsk_need_resched(curr))
- + return;
- +
- + if (test_tsk_need_resched_lazy(curr))
- + return;
- +
- + set_tsk_need_resched_lazy(curr);
- +
- + cpu = cpu_of(rq);
- + if (cpu == smp_processor_id())
- + return;
- +
- + /* NEED_RESCHED_LAZY must be visible before we test polling */
- + smp_mb();
- + if (!tsk_is_polling(curr))
- + smp_send_reschedule(cpu);
- +}
- +#endif
- +
- void resched_cpu(int cpu)
- {
- struct rq *rq = cpu_rq(cpu);
- @@ -595,12 +678,14 @@
- */
- int get_nohz_timer_target(int pinned)
- {
- - int cpu = smp_processor_id();
- + int cpu;
- int i;
- struct sched_domain *sd;
-
- + preempt_disable_rt();
- + cpu = smp_processor_id();
- if (pinned || !get_sysctl_timer_migration() || !idle_cpu(cpu))
- - return cpu;
- + goto preempt_en_rt;
-
- rcu_read_lock();
- for_each_domain(cpu, sd) {
- @@ -613,6 +698,8 @@
- }
- unlock:
- rcu_read_unlock();
- +preempt_en_rt:
- + preempt_enable_rt();
- return cpu;
- }
- /*
- @@ -1164,6 +1251,18 @@
-
- static int migration_cpu_stop(void *data);
-
- +static bool check_task_state(struct task_struct *p, long match_state)
- +{
- + bool match = false;
- +
- + raw_spin_lock_irq(&p->pi_lock);
- + if (p->state == match_state || p->saved_state == match_state)
- + match = true;
- + raw_spin_unlock_irq(&p->pi_lock);
- +
- + return match;
- +}
- +
- /*
- * wait_task_inactive - wait for a thread to unschedule.
- *
- @@ -1208,7 +1307,7 @@
- * is actually now running somewhere else!
- */
- while (task_running(rq, p)) {
- - if (match_state && unlikely(p->state != match_state))
- + if (match_state && !check_task_state(p, match_state))
- return 0;
- cpu_relax();
- }
- @@ -1223,7 +1322,8 @@
- running = task_running(rq, p);
- queued = task_on_rq_queued(p);
- ncsw = 0;
- - if (!match_state || p->state == match_state)
- + if (!match_state || p->state == match_state ||
- + p->saved_state == match_state)
- ncsw = p->nvcsw | LONG_MIN; /* sets MSB */
- task_rq_unlock(rq, p, &flags);
-
- @@ -1449,10 +1549,6 @@
- {
- activate_task(rq, p, en_flags);
- p->on_rq = TASK_ON_RQ_QUEUED;
- -
- - /* if a worker is waking up, notify workqueue */
- - if (p->flags & PF_WQ_WORKER)
- - wq_worker_waking_up(p, cpu_of(rq));
- }
-
- /*
- @@ -1462,9 +1558,9 @@
- ttwu_do_wakeup(struct rq *rq, struct task_struct *p, int wake_flags)
- {
- check_preempt_curr(rq, p, wake_flags);
- - trace_sched_wakeup(p, true);
- -
- p->state = TASK_RUNNING;
- + trace_sched_wakeup(p);
- +
- #ifdef CONFIG_SMP
- if (p->sched_class->task_woken)
- p->sched_class->task_woken(rq, p);
- @@ -1666,8 +1762,29 @@
- */
- smp_mb__before_spinlock();
- raw_spin_lock_irqsave(&p->pi_lock, flags);
- - if (!(p->state & state))
- + if (!(p->state & state)) {
- + /*
- + * The task might be running due to a spinlock sleeper
- + * wakeup. Check the saved state and set it to running
- + * if the wakeup condition is true.
- + */
- + if (!(wake_flags & WF_LOCK_SLEEPER)) {
- + if (p->saved_state & state) {
- + p->saved_state = TASK_RUNNING;
- + success = 1;
- + }
- + }
- goto out;
- + }
- +
- + /*
- + * If this is a regular wakeup, then we can unconditionally
- + * clear the saved state of a "lock sleeper".
- + */
- + if (!(wake_flags & WF_LOCK_SLEEPER))
- + p->saved_state = TASK_RUNNING;
- +
- + trace_sched_waking(p);
-
- success = 1; /* we're going to change ->state */
- cpu = task_cpu(p);
- @@ -1732,42 +1849,6 @@
- }
-
- /**
- - * try_to_wake_up_local - try to wake up a local task with rq lock held
- - * @p: the thread to be awakened
- - *
- - * Put @p on the run-queue if it's not already there. The caller must
- - * ensure that this_rq() is locked, @p is bound to this_rq() and not
- - * the current task.
- - */
- -static void try_to_wake_up_local(struct task_struct *p)
- -{
- - struct rq *rq = task_rq(p);
- -
- - if (WARN_ON_ONCE(rq != this_rq()) ||
- - WARN_ON_ONCE(p == current))
- - return;
- -
- - lockdep_assert_held(&rq->lock);
- -
- - if (!raw_spin_trylock(&p->pi_lock)) {
- - raw_spin_unlock(&rq->lock);
- - raw_spin_lock(&p->pi_lock);
- - raw_spin_lock(&rq->lock);
- - }
- -
- - if (!(p->state & TASK_NORMAL))
- - goto out;
- -
- - if (!task_on_rq_queued(p))
- - ttwu_activate(rq, p, ENQUEUE_WAKEUP);
- -
- - ttwu_do_wakeup(rq, p, 0);
- - ttwu_stat(p, smp_processor_id(), 0);
- -out:
- - raw_spin_unlock(&p->pi_lock);
- -}
- -
- -/**
- * wake_up_process - Wake up a specific process
- * @p: The process to be woken up.
- *
- @@ -1781,11 +1862,23 @@
- */
- int wake_up_process(struct task_struct *p)
- {
- - WARN_ON(task_is_stopped_or_traced(p));
- + WARN_ON(__task_is_stopped_or_traced(p));
- return try_to_wake_up(p, TASK_NORMAL, 0);
- }
- EXPORT_SYMBOL(wake_up_process);
-
- +/**
- + * wake_up_lock_sleeper - Wake up a specific process blocked on a "sleeping lock"
- + * @p: The process to be woken up.
- + *
- + * Same as wake_up_process() above, but wake_flags=WF_LOCK_SLEEPER to indicate
- + * the nature of the wakeup.
- + */
- +int wake_up_lock_sleeper(struct task_struct *p)
- +{
- + return try_to_wake_up(p, TASK_ALL, WF_LOCK_SLEEPER);
- +}
- +
- int wake_up_state(struct task_struct *p, unsigned int state)
- {
- return try_to_wake_up(p, state, 0);
- @@ -1981,6 +2074,9 @@
- p->on_cpu = 0;
- #endif
- init_task_preempt_count(p);
- +#ifdef CONFIG_HAVE_PREEMPT_LAZY
- + task_thread_info(p)->preempt_lazy_count = 0;
- +#endif
- #ifdef CONFIG_SMP
- plist_node_init(&p->pushable_tasks, MAX_PRIO);
- RB_CLEAR_NODE(&p->pushable_dl_tasks);
- @@ -2116,7 +2212,7 @@
- rq = __task_rq_lock(p);
- activate_task(rq, p, 0);
- p->on_rq = TASK_ON_RQ_QUEUED;
- - trace_sched_wakeup_new(p, true);
- + trace_sched_wakeup_new(p);
- check_preempt_curr(rq, p, WF_FORK);
- #ifdef CONFIG_SMP
- if (p->sched_class->task_woken)
- @@ -2253,8 +2349,12 @@
- finish_arch_post_lock_switch();
-
- fire_sched_in_preempt_notifiers(current);
- + /*
- + * We use mmdrop_delayed() here so we don't have to do the
- + * full __mmdrop() when we are the last user.
- + */
- if (mm)
- - mmdrop(mm);
- + mmdrop_delayed(mm);
- if (unlikely(prev_state == TASK_DEAD)) {
- if (prev->sched_class->task_dead)
- prev->sched_class->task_dead(prev);
- @@ -2565,16 +2665,6 @@
- }
- #endif
-
- -notrace unsigned long get_parent_ip(unsigned long addr)
- -{
- - if (in_lock_functions(addr)) {
- - addr = CALLER_ADDR2;
- - if (in_lock_functions(addr))
- - addr = CALLER_ADDR3;
- - }
- - return addr;
- -}
- -
- #if defined(CONFIG_PREEMPT) && (defined(CONFIG_DEBUG_PREEMPT) || \
- defined(CONFIG_PREEMPT_TRACER))
-
- @@ -2596,7 +2686,7 @@
- PREEMPT_MASK - 10);
- #endif
- if (preempt_count() == val) {
- - unsigned long ip = get_parent_ip(CALLER_ADDR1);
- + unsigned long ip = get_lock_parent_ip();
- #ifdef CONFIG_DEBUG_PREEMPT
- current->preempt_disable_ip = ip;
- #endif
- @@ -2623,7 +2713,7 @@
- #endif
-
- if (preempt_count() == val)
- - trace_preempt_on(CALLER_ADDR0, get_parent_ip(CALLER_ADDR1));
- + trace_preempt_on(CALLER_ADDR0, get_lock_parent_ip());
- __preempt_count_sub(val);
- }
- EXPORT_SYMBOL(preempt_count_sub);
- @@ -2679,6 +2769,133 @@
- schedstat_inc(this_rq(), sched_count);
- }
-
- +#if defined(CONFIG_PREEMPT_RT_FULL) && defined(CONFIG_SMP)
- +#define MIGRATE_DISABLE_SET_AFFIN (1<<30) /* Can't make a negative */
- +#define migrate_disabled_updated(p) ((p)->migrate_disable & MIGRATE_DISABLE_SET_AFFIN)
- +#define migrate_disable_count(p) ((p)->migrate_disable & ~MIGRATE_DISABLE_SET_AFFIN)
- +
- +static inline void update_migrate_disable(struct task_struct *p)
- +{
- + const struct cpumask *mask;
- +
- + if (likely(!p->migrate_disable))
- + return;
- +
- + /* Did we already update affinity? */
- + if (unlikely(migrate_disabled_updated(p)))
- + return;
- +
- + /*
- + * Since this is always current we can get away with only locking
- + * rq->lock, the ->cpus_allowed value can normally only be changed
- + * while holding both p->pi_lock and rq->lock, but seeing that this
- + * is current, we cannot actually be waking up, so all code that
- + * relies on serialization against p->pi_lock is out of scope.
- + *
- + * Having rq->lock serializes us against things like
- + * set_cpus_allowed_ptr() that can still happen concurrently.
- + */
- + mask = tsk_cpus_allowed(p);
- +
- + if (p->sched_class->set_cpus_allowed)
- + p->sched_class->set_cpus_allowed(p, mask);
- + /* mask==cpumask_of(task_cpu(p)) which has a cpumask_weight==1 */
- + p->nr_cpus_allowed = 1;
- +
- + /* Let migrate_enable know to fix things back up */
- + p->migrate_disable |= MIGRATE_DISABLE_SET_AFFIN;
- +}
- +
- +void migrate_disable(void)
- +{
- + struct task_struct *p = current;
- +
- + if (in_atomic() || irqs_disabled()) {
- +#ifdef CONFIG_SCHED_DEBUG
- + p->migrate_disable_atomic++;
- +#endif
- + return;
- + }
- +
- +#ifdef CONFIG_SCHED_DEBUG
- + if (unlikely(p->migrate_disable_atomic)) {
- + tracing_off();
- + WARN_ON_ONCE(1);
- + }
- +#endif
- +
- + if (p->migrate_disable) {
- + p->migrate_disable++;
- + return;
- + }
- +
- + preempt_disable();
- + preempt_lazy_disable();
- + pin_current_cpu();
- + p->migrate_disable = 1;
- + preempt_enable();
- +}
- +EXPORT_SYMBOL(migrate_disable);
- +
- +void migrate_enable(void)
- +{
- + struct task_struct *p = current;
- + const struct cpumask *mask;
- + unsigned long flags;
- + struct rq *rq;
- +
- + if (in_atomic() || irqs_disabled()) {
- +#ifdef CONFIG_SCHED_DEBUG
- + p->migrate_disable_atomic--;
- +#endif
- + return;
- + }
- +
- +#ifdef CONFIG_SCHED_DEBUG
- + if (unlikely(p->migrate_disable_atomic)) {
- + tracing_off();
- + WARN_ON_ONCE(1);
- + }
- +#endif
- + WARN_ON_ONCE(p->migrate_disable <= 0);
- +
- + if (migrate_disable_count(p) > 1) {
- + p->migrate_disable--;
- + return;
- + }
- +
- + preempt_disable();
- + if (unlikely(migrate_disabled_updated(p))) {
- + /*
- + * Undo whatever update_migrate_disable() did, also see there
- + * about locking.
- + */
- + rq = this_rq();
- + raw_spin_lock_irqsave(&rq->lock, flags);
- +
- + /*
- + * Clearing migrate_disable causes tsk_cpus_allowed to
- + * show the tasks original cpu affinity.
- + */
- + p->migrate_disable = 0;
- + mask = tsk_cpus_allowed(p);
- + if (p->sched_class->set_cpus_allowed)
- + p->sched_class->set_cpus_allowed(p, mask);
- + p->nr_cpus_allowed = cpumask_weight(mask);
- + raw_spin_unlock_irqrestore(&rq->lock, flags);
- + } else
- + p->migrate_disable = 0;
- +
- + unpin_current_cpu();
- + preempt_enable();
- + preempt_lazy_enable();
- +}
- +EXPORT_SYMBOL(migrate_enable);
- +#else
- +static inline void update_migrate_disable(struct task_struct *p) { }
- +#define migrate_disabled_updated(p) 0
- +#endif
- +
- /*
- * Pick up the highest-prio task:
- */
- @@ -2785,6 +3002,8 @@
- smp_mb__before_spinlock();
- raw_spin_lock_irq(&rq->lock);
-
- + update_migrate_disable(prev);
- +
- rq->clock_skip_update <<= 1; /* promote REQ to ACT */
-
- switch_count = &prev->nivcsw;
- @@ -2794,19 +3013,6 @@
- } else {
- deactivate_task(rq, prev, DEQUEUE_SLEEP);
- prev->on_rq = 0;
- -
- - /*
- - * If a worker went to sleep, notify and ask workqueue
- - * whether it wants to wake up a task to maintain
- - * concurrency.
- - */
- - if (prev->flags & PF_WQ_WORKER) {
- - struct task_struct *to_wakeup;
- -
- - to_wakeup = wq_worker_sleeping(prev, cpu);
- - if (to_wakeup)
- - try_to_wake_up_local(to_wakeup);
- - }
- }
- switch_count = &prev->nvcsw;
- }
- @@ -2816,6 +3022,7 @@
-
- next = pick_next_task(rq, prev);
- clear_tsk_need_resched(prev);
- + clear_tsk_need_resched_lazy(prev);
- clear_preempt_need_resched();
- rq->clock_skip_update = 0;
-
- @@ -2836,8 +3043,19 @@
-
- static inline void sched_submit_work(struct task_struct *tsk)
- {
- - if (!tsk->state || tsk_is_pi_blocked(tsk))
- + if (!tsk->state)
- + return;
- + /*
- + * If a worker went to sleep, notify and ask workqueue whether
- + * it wants to wake up a task to maintain concurrency.
- + */
- + if (tsk->flags & PF_WQ_WORKER)
- + wq_worker_sleeping(tsk);
- +
- +
- + if (tsk_is_pi_blocked(tsk))
- return;
- +
- /*
- * If we are going to sleep and we have plugged IO queued,
- * make sure to submit it to avoid deadlocks.
- @@ -2846,6 +3064,12 @@
- blk_schedule_flush_plug(tsk);
- }
-
- +static void sched_update_worker(struct task_struct *tsk)
- +{
- + if (tsk->flags & PF_WQ_WORKER)
- + wq_worker_running(tsk);
- +}
- +
- asmlinkage __visible void __sched schedule(void)
- {
- struct task_struct *tsk = current;
- @@ -2854,6 +3078,7 @@
- do {
- __schedule();
- } while (need_resched());
- + sched_update_worker(tsk);
- }
- EXPORT_SYMBOL(schedule);
-
- @@ -2903,6 +3128,30 @@
- } while (need_resched());
- }
-
- +#ifdef CONFIG_PREEMPT_LAZY
- +/*
- + * If TIF_NEED_RESCHED is then we allow to be scheduled away since this is
- + * set by a RT task. Oterwise we try to avoid beeing scheduled out as long as
- + * preempt_lazy_count counter >0.
- + */
- +static __always_inline int preemptible_lazy(void)
- +{
- + if (test_thread_flag(TIF_NEED_RESCHED))
- + return 1;
- + if (current_thread_info()->preempt_lazy_count)
- + return 0;
- + return 1;
- +}
- +
- +#else
- +
- +static inline int preemptible_lazy(void)
- +{
- + return 1;
- +}
- +
- +#endif
- +
- #ifdef CONFIG_PREEMPT
- /*
- * this is the entry point to schedule() from in-kernel preemption
- @@ -2917,6 +3166,8 @@
- */
- if (likely(!preemptible()))
- return;
- + if (!preemptible_lazy())
- + return;
-
- preempt_schedule_common();
- }
- @@ -2944,6 +3195,8 @@
-
- if (likely(!preemptible()))
- return;
- + if (!preemptible_lazy())
- + return;
-
- do {
- __preempt_count_add(PREEMPT_ACTIVE);
- @@ -2953,7 +3206,16 @@
- * an infinite recursion.
- */
- prev_ctx = exception_enter();
- + /*
- + * The add/subtract must not be traced by the function
- + * tracer. But we still want to account for the
- + * preempt off latency tracer. Since the _notrace versions
- + * of add/subtract skip the accounting for latency tracer
- + * we must force it manually.
- + */
- + start_critical_timings();
- __schedule();
- + stop_critical_timings();
- exception_exit(prev_ctx);
-
- __preempt_count_sub(PREEMPT_ACTIVE);
- @@ -4290,6 +4552,7 @@
- }
- EXPORT_SYMBOL(__cond_resched_lock);
-
- +#ifndef CONFIG_PREEMPT_RT_FULL
- int __sched __cond_resched_softirq(void)
- {
- BUG_ON(!in_softirq());
- @@ -4303,6 +4566,7 @@
- return 0;
- }
- EXPORT_SYMBOL(__cond_resched_softirq);
- +#endif
-
- /**
- * yield - yield the current processor to other threads.
- @@ -4659,7 +4923,9 @@
-
- /* Set the preempt count _outside_ the spinlocks! */
- init_idle_preempt_count(idle, cpu);
- -
- +#ifdef CONFIG_HAVE_PREEMPT_LAZY
- + task_thread_info(idle)->preempt_lazy_count = 0;
- +#endif
- /*
- * The idle tasks have their own, simple scheduling class:
- */
- @@ -4779,11 +5045,91 @@
-
- void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask)
- {
- - if (p->sched_class->set_cpus_allowed)
- - p->sched_class->set_cpus_allowed(p, new_mask);
- + if (!migrate_disabled_updated(p)) {
- + if (p->sched_class->set_cpus_allowed)
- + p->sched_class->set_cpus_allowed(p, new_mask);
- + p->nr_cpus_allowed = cpumask_weight(new_mask);
- + }
-
- cpumask_copy(&p->cpus_allowed, new_mask);
- - p->nr_cpus_allowed = cpumask_weight(new_mask);
- +}
- +
- +static DEFINE_PER_CPU(struct cpumask, sched_cpumasks);
- +static DEFINE_MUTEX(sched_down_mutex);
- +static cpumask_t sched_down_cpumask;
- +
- +void tell_sched_cpu_down_begin(int cpu)
- +{
- + mutex_lock(&sched_down_mutex);
- + cpumask_set_cpu(cpu, &sched_down_cpumask);
- + mutex_unlock(&sched_down_mutex);
- +}
- +
- +void tell_sched_cpu_down_done(int cpu)
- +{
- + mutex_lock(&sched_down_mutex);
- + cpumask_clear_cpu(cpu, &sched_down_cpumask);
- + mutex_unlock(&sched_down_mutex);
- +}
- +
- +/**
- + * migrate_me - try to move the current task off this cpu
- + *
- + * Used by the pin_current_cpu() code to try to get tasks
- + * to move off the current CPU as it is going down.
- + * It will only move the task if the task isn't pinned to
- + * the CPU (with migrate_disable, affinity or NO_SETAFFINITY)
- + * and the task has to be in a RUNNING state. Otherwise the
- + * movement of the task will wake it up (change its state
- + * to running) when the task did not expect it.
- + *
- + * Returns 1 if it succeeded in moving the current task
- + * 0 otherwise.
- + */
- +int migrate_me(void)
- +{
- + struct task_struct *p = current;
- + struct migration_arg arg;
- + struct cpumask *cpumask;
- + struct cpumask *mask;
- + unsigned long flags;
- + unsigned int dest_cpu;
- + struct rq *rq;
- +
- + /*
- + * We can not migrate tasks bounded to a CPU or tasks not
- + * running. The movement of the task will wake it up.
- + */
- + if (p->flags & PF_NO_SETAFFINITY || p->state)
- + return 0;
- +
- + mutex_lock(&sched_down_mutex);
- + rq = task_rq_lock(p, &flags);
- +
- + cpumask = this_cpu_ptr(&sched_cpumasks);
- + mask = &p->cpus_allowed;
- +
- + cpumask_andnot(cpumask, mask, &sched_down_cpumask);
- +
- + if (!cpumask_weight(cpumask)) {
- + /* It's only on this CPU? */
- + task_rq_unlock(rq, p, &flags);
- + mutex_unlock(&sched_down_mutex);
- + return 0;
- + }
- +
- + dest_cpu = cpumask_any_and(cpu_active_mask, cpumask);
- +
- + arg.task = p;
- + arg.dest_cpu = dest_cpu;
- +
- + task_rq_unlock(rq, p, &flags);
- +
- + stop_one_cpu(cpu_of(rq), migration_cpu_stop, &arg);
- + tlb_migrate_finish(p->mm);
- + mutex_unlock(&sched_down_mutex);
- +
- + return 1;
- }
-
- /*
- @@ -4829,7 +5175,7 @@
- do_set_cpus_allowed(p, new_mask);
-
- /* Can the task run on the task's current CPU? If so, we're done */
- - if (cpumask_test_cpu(task_cpu(p), new_mask))
- + if (cpumask_test_cpu(task_cpu(p), new_mask) || __migrate_disabled(p))
- goto out;
-
- dest_cpu = cpumask_any_and(cpu_active_mask, new_mask);
- @@ -4969,6 +5315,8 @@
-
- #ifdef CONFIG_HOTPLUG_CPU
-
- +static DEFINE_PER_CPU(struct mm_struct *, idle_last_mm);
- +
- /*
- * Ensures that the idle task is using init_mm right before its cpu goes
- * offline.
- @@ -4983,7 +5331,11 @@
- switch_mm(mm, &init_mm, current);
- finish_arch_post_lock_switch();
- }
- - mmdrop(mm);
- + /*
- + * Defer the cleanup to an alive cpu. On RT we can neither
- + * call mmdrop() nor mmdrop_delayed() from here.
- + */
- + per_cpu(idle_last_mm, smp_processor_id()) = mm;
- }
-
- /*
- @@ -5326,6 +5678,10 @@
-
- case CPU_DEAD:
- calc_load_migrate(rq);
- + if (per_cpu(idle_last_mm, cpu)) {
- + mmdrop(per_cpu(idle_last_mm, cpu));
- + per_cpu(idle_last_mm, cpu) = NULL;
- + }
- break;
- #endif
- }
- @@ -7305,7 +7661,8 @@
- #ifdef CONFIG_DEBUG_ATOMIC_SLEEP
- static inline int preempt_count_equals(int preempt_offset)
- {
- - int nested = (preempt_count() & ~PREEMPT_ACTIVE) + rcu_preempt_depth();
- + int nested = (preempt_count() & ~PREEMPT_ACTIVE) +
- + sched_rcu_preempt_depth();
-
- return (nested == preempt_offset);
- }
- diff -Nur linux-4.1.39.orig/kernel/sched/cputime.c linux-4.1.39/kernel/sched/cputime.c
- --- linux-4.1.39.orig/kernel/sched/cputime.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/sched/cputime.c 2017-04-18 17:56:30.633397907 +0200
- @@ -675,37 +675,45 @@
-
- void vtime_account_system(struct task_struct *tsk)
- {
- - write_seqlock(&tsk->vtime_seqlock);
- + raw_spin_lock(&tsk->vtime_lock);
- + write_seqcount_begin(&tsk->vtime_seq);
- __vtime_account_system(tsk);
- - write_sequnlock(&tsk->vtime_seqlock);
- + write_seqcount_end(&tsk->vtime_seq);
- + raw_spin_unlock(&tsk->vtime_lock);
- }
-
- void vtime_gen_account_irq_exit(struct task_struct *tsk)
- {
- - write_seqlock(&tsk->vtime_seqlock);
- + raw_spin_lock(&tsk->vtime_lock);
- + write_seqcount_begin(&tsk->vtime_seq);
- __vtime_account_system(tsk);
- if (context_tracking_in_user())
- tsk->vtime_snap_whence = VTIME_USER;
- - write_sequnlock(&tsk->vtime_seqlock);
- + write_seqcount_end(&tsk->vtime_seq);
- + raw_spin_unlock(&tsk->vtime_lock);
- }
-
- void vtime_account_user(struct task_struct *tsk)
- {
- cputime_t delta_cpu;
-
- - write_seqlock(&tsk->vtime_seqlock);
- + raw_spin_lock(&tsk->vtime_lock);
- + write_seqcount_begin(&tsk->vtime_seq);
- delta_cpu = get_vtime_delta(tsk);
- tsk->vtime_snap_whence = VTIME_SYS;
- account_user_time(tsk, delta_cpu, cputime_to_scaled(delta_cpu));
- - write_sequnlock(&tsk->vtime_seqlock);
- + write_seqcount_end(&tsk->vtime_seq);
- + raw_spin_unlock(&tsk->vtime_lock);
- }
-
- void vtime_user_enter(struct task_struct *tsk)
- {
- - write_seqlock(&tsk->vtime_seqlock);
- + raw_spin_lock(&tsk->vtime_lock);
- + write_seqcount_begin(&tsk->vtime_seq);
- __vtime_account_system(tsk);
- tsk->vtime_snap_whence = VTIME_USER;
- - write_sequnlock(&tsk->vtime_seqlock);
- + write_seqcount_end(&tsk->vtime_seq);
- + raw_spin_unlock(&tsk->vtime_lock);
- }
-
- void vtime_guest_enter(struct task_struct *tsk)
- @@ -717,19 +725,23 @@
- * synchronization against the reader (task_gtime())
- * that can thus safely catch up with a tickless delta.
- */
- - write_seqlock(&tsk->vtime_seqlock);
- + raw_spin_lock(&tsk->vtime_lock);
- + write_seqcount_begin(&tsk->vtime_seq);
- __vtime_account_system(tsk);
- current->flags |= PF_VCPU;
- - write_sequnlock(&tsk->vtime_seqlock);
- + write_seqcount_end(&tsk->vtime_seq);
- + raw_spin_unlock(&tsk->vtime_lock);
- }
- EXPORT_SYMBOL_GPL(vtime_guest_enter);
-
- void vtime_guest_exit(struct task_struct *tsk)
- {
- - write_seqlock(&tsk->vtime_seqlock);
- + raw_spin_lock(&tsk->vtime_lock);
- + write_seqcount_begin(&tsk->vtime_seq);
- __vtime_account_system(tsk);
- current->flags &= ~PF_VCPU;
- - write_sequnlock(&tsk->vtime_seqlock);
- + write_seqcount_end(&tsk->vtime_seq);
- + raw_spin_unlock(&tsk->vtime_lock);
- }
- EXPORT_SYMBOL_GPL(vtime_guest_exit);
-
- @@ -742,24 +754,30 @@
-
- void arch_vtime_task_switch(struct task_struct *prev)
- {
- - write_seqlock(&prev->vtime_seqlock);
- + raw_spin_lock(&prev->vtime_lock);
- + write_seqcount_begin(&prev->vtime_seq);
- prev->vtime_snap_whence = VTIME_SLEEPING;
- - write_sequnlock(&prev->vtime_seqlock);
- + write_seqcount_end(&prev->vtime_seq);
- + raw_spin_unlock(&prev->vtime_lock);
-
- - write_seqlock(¤t->vtime_seqlock);
- + raw_spin_lock(¤t->vtime_lock);
- + write_seqcount_begin(¤t->vtime_seq);
- current->vtime_snap_whence = VTIME_SYS;
- current->vtime_snap = sched_clock_cpu(smp_processor_id());
- - write_sequnlock(¤t->vtime_seqlock);
- + write_seqcount_end(¤t->vtime_seq);
- + raw_spin_unlock(¤t->vtime_lock);
- }
-
- void vtime_init_idle(struct task_struct *t, int cpu)
- {
- unsigned long flags;
-
- - write_seqlock_irqsave(&t->vtime_seqlock, flags);
- + raw_spin_lock_irqsave(&t->vtime_lock, flags);
- + write_seqcount_begin(&t->vtime_seq);
- t->vtime_snap_whence = VTIME_SYS;
- t->vtime_snap = sched_clock_cpu(cpu);
- - write_sequnlock_irqrestore(&t->vtime_seqlock, flags);
- + write_seqcount_end(&t->vtime_seq);
- + raw_spin_unlock_irqrestore(&t->vtime_lock, flags);
- }
-
- cputime_t task_gtime(struct task_struct *t)
- @@ -768,13 +786,13 @@
- cputime_t gtime;
-
- do {
- - seq = read_seqbegin(&t->vtime_seqlock);
- + seq = read_seqcount_begin(&t->vtime_seq);
-
- gtime = t->gtime;
- if (t->flags & PF_VCPU)
- gtime += vtime_delta(t);
-
- - } while (read_seqretry(&t->vtime_seqlock, seq));
- + } while (read_seqcount_retry(&t->vtime_seq, seq));
-
- return gtime;
- }
- @@ -797,7 +815,7 @@
- *udelta = 0;
- *sdelta = 0;
-
- - seq = read_seqbegin(&t->vtime_seqlock);
- + seq = read_seqcount_begin(&t->vtime_seq);
-
- if (u_dst)
- *u_dst = *u_src;
- @@ -821,7 +839,7 @@
- if (t->vtime_snap_whence == VTIME_SYS)
- *sdelta = delta;
- }
- - } while (read_seqretry(&t->vtime_seqlock, seq));
- + } while (read_seqcount_retry(&t->vtime_seq, seq));
- }
-
-
- diff -Nur linux-4.1.39.orig/kernel/sched/deadline.c linux-4.1.39/kernel/sched/deadline.c
- --- linux-4.1.39.orig/kernel/sched/deadline.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/sched/deadline.c 2017-04-18 17:56:30.633397907 +0200
- @@ -637,6 +637,7 @@
-
- hrtimer_init(timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
- timer->function = dl_task_timer;
- + timer->irqsafe = 1;
- }
-
- static
- diff -Nur linux-4.1.39.orig/kernel/sched/debug.c linux-4.1.39/kernel/sched/debug.c
- --- linux-4.1.39.orig/kernel/sched/debug.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/sched/debug.c 2017-04-18 17:56:30.633397907 +0200
- @@ -260,6 +260,9 @@
- P(rt_throttled);
- PN(rt_time);
- PN(rt_runtime);
- +#ifdef CONFIG_SMP
- + P(rt_nr_migratory);
- +#endif
-
- #undef PN
- #undef P
- @@ -648,6 +651,10 @@
- #endif
- P(policy);
- P(prio);
- +#ifdef CONFIG_PREEMPT_RT_FULL
- + P(migrate_disable);
- +#endif
- + P(nr_cpus_allowed);
- #undef PN
- #undef __PN
- #undef P
- diff -Nur linux-4.1.39.orig/kernel/sched/fair.c linux-4.1.39/kernel/sched/fair.c
- --- linux-4.1.39.orig/kernel/sched/fair.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/sched/fair.c 2017-04-18 17:56:30.637398061 +0200
- @@ -3201,7 +3201,7 @@
- ideal_runtime = sched_slice(cfs_rq, curr);
- delta_exec = curr->sum_exec_runtime - curr->prev_sum_exec_runtime;
- if (delta_exec > ideal_runtime) {
- - resched_curr(rq_of(cfs_rq));
- + resched_curr_lazy(rq_of(cfs_rq));
- /*
- * The current task ran long enough, ensure it doesn't get
- * re-elected due to buddy favours.
- @@ -3225,7 +3225,7 @@
- return;
-
- if (delta > ideal_runtime)
- - resched_curr(rq_of(cfs_rq));
- + resched_curr_lazy(rq_of(cfs_rq));
- }
-
- static void
- @@ -3366,7 +3366,7 @@
- * validating it and just reschedule.
- */
- if (queued) {
- - resched_curr(rq_of(cfs_rq));
- + resched_curr_lazy(rq_of(cfs_rq));
- return;
- }
- /*
- @@ -3557,7 +3557,7 @@
- * hierarchy can be throttled
- */
- if (!assign_cfs_rq_runtime(cfs_rq) && likely(cfs_rq->curr))
- - resched_curr(rq_of(cfs_rq));
- + resched_curr_lazy(rq_of(cfs_rq));
- }
-
- static __always_inline
- @@ -4180,7 +4180,7 @@
-
- if (delta < 0) {
- if (rq->curr == p)
- - resched_curr(rq);
- + resched_curr_lazy(rq);
- return;
- }
- hrtick_start(rq, delta);
- @@ -5076,7 +5076,7 @@
- return;
-
- preempt:
- - resched_curr(rq);
- + resched_curr_lazy(rq);
- /*
- * Only set the backward buddy when the current task is still
- * on the rq. This can happen when a wakeup gets interleaved
- @@ -7869,7 +7869,7 @@
- * 'current' within the tree based on its new key value.
- */
- swap(curr->vruntime, se->vruntime);
- - resched_curr(rq);
- + resched_curr_lazy(rq);
- }
-
- se->vruntime -= cfs_rq->min_vruntime;
- @@ -7894,7 +7894,7 @@
- */
- if (rq->curr == p) {
- if (p->prio > oldprio)
- - resched_curr(rq);
- + resched_curr_lazy(rq);
- } else
- check_preempt_curr(rq, p, 0);
- }
- diff -Nur linux-4.1.39.orig/kernel/sched/features.h linux-4.1.39/kernel/sched/features.h
- --- linux-4.1.39.orig/kernel/sched/features.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/sched/features.h 2017-04-18 17:56:30.637398061 +0200
- @@ -50,11 +50,19 @@
- */
- SCHED_FEAT(NONTASK_CAPACITY, true)
-
- +#ifdef CONFIG_PREEMPT_RT_FULL
- +SCHED_FEAT(TTWU_QUEUE, false)
- +# ifdef CONFIG_PREEMPT_LAZY
- +SCHED_FEAT(PREEMPT_LAZY, true)
- +# endif
- +#else
- +
- /*
- * Queue remote wakeups on the target CPU and process them
- * using the scheduler IPI. Reduces rq->lock contention/bounces.
- */
- SCHED_FEAT(TTWU_QUEUE, true)
- +#endif
-
- #ifdef HAVE_RT_PUSH_IPI
- /*
- diff -Nur linux-4.1.39.orig/kernel/sched/Makefile linux-4.1.39/kernel/sched/Makefile
- --- linux-4.1.39.orig/kernel/sched/Makefile 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/sched/Makefile 2017-04-18 17:56:30.633397907 +0200
- @@ -13,7 +13,7 @@
-
- obj-y += core.o proc.o clock.o cputime.o
- obj-y += idle_task.o fair.o rt.o deadline.o stop_task.o
- -obj-y += wait.o completion.o idle.o
- +obj-y += wait.o wait-simple.o work-simple.o completion.o idle.o
- obj-$(CONFIG_SMP) += cpupri.o cpudeadline.o
- obj-$(CONFIG_SCHED_AUTOGROUP) += auto_group.o
- obj-$(CONFIG_SCHEDSTATS) += stats.o
- diff -Nur linux-4.1.39.orig/kernel/sched/rt.c linux-4.1.39/kernel/sched/rt.c
- --- linux-4.1.39.orig/kernel/sched/rt.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/sched/rt.c 2017-04-18 17:56:30.637398061 +0200
- @@ -44,6 +44,7 @@
-
- hrtimer_init(&rt_b->rt_period_timer,
- CLOCK_MONOTONIC, HRTIMER_MODE_REL);
- + rt_b->rt_period_timer.irqsafe = 1;
- rt_b->rt_period_timer.function = sched_rt_period_timer;
- }
-
- @@ -89,6 +90,7 @@
- rt_rq->push_cpu = nr_cpu_ids;
- raw_spin_lock_init(&rt_rq->push_lock);
- init_irq_work(&rt_rq->push_work, push_irq_work_func);
- + rt_rq->push_work.flags |= IRQ_WORK_HARD_IRQ;
- #endif
- #endif /* CONFIG_SMP */
- /* We start is dequeued state, because no RT tasks are queued */
- diff -Nur linux-4.1.39.orig/kernel/sched/sched.h linux-4.1.39/kernel/sched/sched.h
- --- linux-4.1.39.orig/kernel/sched/sched.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/sched/sched.h 2017-04-18 17:56:30.637398061 +0200
- @@ -1093,6 +1093,7 @@
- #define WF_SYNC 0x01 /* waker goes to sleep after wakeup */
- #define WF_FORK 0x02 /* child wakeup after fork */
- #define WF_MIGRATED 0x4 /* internal use, task got migrated */
- +#define WF_LOCK_SLEEPER 0x08 /* wakeup spinlock "sleeper" */
-
- /*
- * To aid in avoiding the subversion of "niceness" due to uneven distribution
- @@ -1290,6 +1291,15 @@
- extern void resched_curr(struct rq *rq);
- extern void resched_cpu(int cpu);
-
- +#ifdef CONFIG_PREEMPT_LAZY
- +extern void resched_curr_lazy(struct rq *rq);
- +#else
- +static inline void resched_curr_lazy(struct rq *rq)
- +{
- + resched_curr(rq);
- +}
- +#endif
- +
- extern struct rt_bandwidth def_rt_bandwidth;
- extern void init_rt_bandwidth(struct rt_bandwidth *rt_b, u64 period, u64 runtime);
-
- diff -Nur linux-4.1.39.orig/kernel/sched/wait-simple.c linux-4.1.39/kernel/sched/wait-simple.c
- --- linux-4.1.39.orig/kernel/sched/wait-simple.c 1970-01-01 01:00:00.000000000 +0100
- +++ linux-4.1.39/kernel/sched/wait-simple.c 2017-04-18 17:56:30.637398061 +0200
- @@ -0,0 +1,115 @@
- +/*
- + * Simple waitqueues without fancy flags and callbacks
- + *
- + * (C) 2011 Thomas Gleixner <tglx@linutronix.de>
- + *
- + * Based on kernel/wait.c
- + *
- + * For licencing details see kernel-base/COPYING
- + */
- +#include <linux/init.h>
- +#include <linux/export.h>
- +#include <linux/sched.h>
- +#include <linux/wait-simple.h>
- +
- +/* Adds w to head->list. Must be called with head->lock locked. */
- +static inline void __swait_enqueue(struct swait_head *head, struct swaiter *w)
- +{
- + list_add(&w->node, &head->list);
- + /* We can't let the condition leak before the setting of head */
- + smp_mb();
- +}
- +
- +/* Removes w from head->list. Must be called with head->lock locked. */
- +static inline void __swait_dequeue(struct swaiter *w)
- +{
- + list_del_init(&w->node);
- +}
- +
- +void __init_swait_head(struct swait_head *head, struct lock_class_key *key)
- +{
- + raw_spin_lock_init(&head->lock);
- + lockdep_set_class(&head->lock, key);
- + INIT_LIST_HEAD(&head->list);
- +}
- +EXPORT_SYMBOL(__init_swait_head);
- +
- +void swait_prepare_locked(struct swait_head *head, struct swaiter *w)
- +{
- + w->task = current;
- + if (list_empty(&w->node))
- + __swait_enqueue(head, w);
- +}
- +
- +void swait_prepare(struct swait_head *head, struct swaiter *w, int state)
- +{
- + unsigned long flags;
- +
- + raw_spin_lock_irqsave(&head->lock, flags);
- + swait_prepare_locked(head, w);
- + __set_current_state(state);
- + raw_spin_unlock_irqrestore(&head->lock, flags);
- +}
- +EXPORT_SYMBOL(swait_prepare);
- +
- +void swait_finish_locked(struct swait_head *head, struct swaiter *w)
- +{
- + __set_current_state(TASK_RUNNING);
- + if (w->task)
- + __swait_dequeue(w);
- +}
- +
- +void swait_finish(struct swait_head *head, struct swaiter *w)
- +{
- + unsigned long flags;
- +
- + __set_current_state(TASK_RUNNING);
- + if (w->task) {
- + raw_spin_lock_irqsave(&head->lock, flags);
- + __swait_dequeue(w);
- + raw_spin_unlock_irqrestore(&head->lock, flags);
- + }
- +}
- +EXPORT_SYMBOL(swait_finish);
- +
- +unsigned int
- +__swait_wake_locked(struct swait_head *head, unsigned int state, unsigned int num)
- +{
- + struct swaiter *curr, *next;
- + int woken = 0;
- +
- + list_for_each_entry_safe(curr, next, &head->list, node) {
- + if (wake_up_state(curr->task, state)) {
- + __swait_dequeue(curr);
- + /*
- + * The waiting task can free the waiter as
- + * soon as curr->task = NULL is written,
- + * without taking any locks. A memory barrier
- + * is required here to prevent the following
- + * store to curr->task from getting ahead of
- + * the dequeue operation.
- + */
- + smp_wmb();
- + curr->task = NULL;
- + if (++woken == num)
- + break;
- + }
- + }
- + return woken;
- +}
- +
- +unsigned int
- +__swait_wake(struct swait_head *head, unsigned int state, unsigned int num)
- +{
- + unsigned long flags;
- + int woken;
- +
- + if (!swaitqueue_active(head))
- + return 0;
- +
- + raw_spin_lock_irqsave(&head->lock, flags);
- + woken = __swait_wake_locked(head, state, num);
- + raw_spin_unlock_irqrestore(&head->lock, flags);
- + return woken;
- +}
- +EXPORT_SYMBOL(__swait_wake);
- diff -Nur linux-4.1.39.orig/kernel/sched/work-simple.c linux-4.1.39/kernel/sched/work-simple.c
- --- linux-4.1.39.orig/kernel/sched/work-simple.c 1970-01-01 01:00:00.000000000 +0100
- +++ linux-4.1.39/kernel/sched/work-simple.c 2017-04-18 17:56:30.637398061 +0200
- @@ -0,0 +1,173 @@
- +/*
- + * Copyright (C) 2014 BMW Car IT GmbH, Daniel Wagner daniel.wagner@bmw-carit.de
- + *
- + * Provides a framework for enqueuing callbacks from irq context
- + * PREEMPT_RT_FULL safe. The callbacks are executed in kthread context.
- + */
- +
- +#include <linux/wait-simple.h>
- +#include <linux/work-simple.h>
- +#include <linux/kthread.h>
- +#include <linux/slab.h>
- +#include <linux/spinlock.h>
- +#include <linux/export.h>
- +
- +#define SWORK_EVENT_PENDING (1 << 0)
- +
- +static DEFINE_MUTEX(worker_mutex);
- +static struct sworker *glob_worker;
- +
- +struct sworker {
- + struct list_head events;
- + struct swait_head wq;
- +
- + raw_spinlock_t lock;
- +
- + struct task_struct *task;
- + int refs;
- +};
- +
- +static bool swork_readable(struct sworker *worker)
- +{
- + bool r;
- +
- + if (kthread_should_stop())
- + return true;
- +
- + raw_spin_lock_irq(&worker->lock);
- + r = !list_empty(&worker->events);
- + raw_spin_unlock_irq(&worker->lock);
- +
- + return r;
- +}
- +
- +static int swork_kthread(void *arg)
- +{
- + struct sworker *worker = arg;
- +
- + for (;;) {
- + swait_event_interruptible(worker->wq,
- + swork_readable(worker));
- + if (kthread_should_stop())
- + break;
- +
- + raw_spin_lock_irq(&worker->lock);
- + while (!list_empty(&worker->events)) {
- + struct swork_event *sev;
- +
- + sev = list_first_entry(&worker->events,
- + struct swork_event, item);
- + list_del(&sev->item);
- + raw_spin_unlock_irq(&worker->lock);
- +
- + WARN_ON_ONCE(!test_and_clear_bit(SWORK_EVENT_PENDING,
- + &sev->flags));
- + sev->func(sev);
- + raw_spin_lock_irq(&worker->lock);
- + }
- + raw_spin_unlock_irq(&worker->lock);
- + }
- + return 0;
- +}
- +
- +static struct sworker *swork_create(void)
- +{
- + struct sworker *worker;
- +
- + worker = kzalloc(sizeof(*worker), GFP_KERNEL);
- + if (!worker)
- + return ERR_PTR(-ENOMEM);
- +
- + INIT_LIST_HEAD(&worker->events);
- + raw_spin_lock_init(&worker->lock);
- + init_swait_head(&worker->wq);
- +
- + worker->task = kthread_run(swork_kthread, worker, "kswork");
- + if (IS_ERR(worker->task)) {
- + kfree(worker);
- + return ERR_PTR(-ENOMEM);
- + }
- +
- + return worker;
- +}
- +
- +static void swork_destroy(struct sworker *worker)
- +{
- + kthread_stop(worker->task);
- +
- + WARN_ON(!list_empty(&worker->events));
- + kfree(worker);
- +}
- +
- +/**
- + * swork_queue - queue swork
- + *
- + * Returns %false if @work was already on a queue, %true otherwise.
- + *
- + * The work is queued and processed on a random CPU
- + */
- +bool swork_queue(struct swork_event *sev)
- +{
- + unsigned long flags;
- +
- + if (test_and_set_bit(SWORK_EVENT_PENDING, &sev->flags))
- + return false;
- +
- + raw_spin_lock_irqsave(&glob_worker->lock, flags);
- + list_add_tail(&sev->item, &glob_worker->events);
- + raw_spin_unlock_irqrestore(&glob_worker->lock, flags);
- +
- + swait_wake(&glob_worker->wq);
- + return true;
- +}
- +EXPORT_SYMBOL_GPL(swork_queue);
- +
- +/**
- + * swork_get - get an instance of the sworker
- + *
- + * Returns an negative error code if the initialization if the worker did not
- + * work, %0 otherwise.
- + *
- + */
- +int swork_get(void)
- +{
- + struct sworker *worker;
- +
- + mutex_lock(&worker_mutex);
- + if (!glob_worker) {
- + worker = swork_create();
- + if (IS_ERR(worker)) {
- + mutex_unlock(&worker_mutex);
- + return -ENOMEM;
- + }
- +
- + glob_worker = worker;
- + }
- +
- + glob_worker->refs++;
- + mutex_unlock(&worker_mutex);
- +
- + return 0;
- +}
- +EXPORT_SYMBOL_GPL(swork_get);
- +
- +/**
- + * swork_put - puts an instance of the sworker
- + *
- + * Will destroy the sworker thread. This function must not be called until all
- + * queued events have been completed.
- + */
- +void swork_put(void)
- +{
- + mutex_lock(&worker_mutex);
- +
- + glob_worker->refs--;
- + if (glob_worker->refs > 0)
- + goto out;
- +
- + swork_destroy(glob_worker);
- + glob_worker = NULL;
- +out:
- + mutex_unlock(&worker_mutex);
- +}
- +EXPORT_SYMBOL_GPL(swork_put);
- diff -Nur linux-4.1.39.orig/kernel/signal.c linux-4.1.39/kernel/signal.c
- --- linux-4.1.39.orig/kernel/signal.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/signal.c 2017-04-18 17:56:30.637398061 +0200
- @@ -14,6 +14,7 @@
- #include <linux/export.h>
- #include <linux/init.h>
- #include <linux/sched.h>
- +#include <linux/sched/rt.h>
- #include <linux/fs.h>
- #include <linux/tty.h>
- #include <linux/binfmts.h>
- @@ -352,13 +353,45 @@
- return false;
- }
-
- +#ifdef __HAVE_ARCH_CMPXCHG
- +static inline struct sigqueue *get_task_cache(struct task_struct *t)
- +{
- + struct sigqueue *q = t->sigqueue_cache;
- +
- + if (cmpxchg(&t->sigqueue_cache, q, NULL) != q)
- + return NULL;
- + return q;
- +}
- +
- +static inline int put_task_cache(struct task_struct *t, struct sigqueue *q)
- +{
- + if (cmpxchg(&t->sigqueue_cache, NULL, q) == NULL)
- + return 0;
- + return 1;
- +}
- +
- +#else
- +
- +static inline struct sigqueue *get_task_cache(struct task_struct *t)
- +{
- + return NULL;
- +}
- +
- +static inline int put_task_cache(struct task_struct *t, struct sigqueue *q)
- +{
- + return 1;
- +}
- +
- +#endif
- +
- /*
- * allocate a new signal queue record
- * - this may be called without locks if and only if t == current, otherwise an
- * appropriate lock must be held to stop the target task from exiting
- */
- static struct sigqueue *
- -__sigqueue_alloc(int sig, struct task_struct *t, gfp_t flags, int override_rlimit)
- +__sigqueue_do_alloc(int sig, struct task_struct *t, gfp_t flags,
- + int override_rlimit, int fromslab)
- {
- struct sigqueue *q = NULL;
- struct user_struct *user;
- @@ -375,7 +408,10 @@
- if (override_rlimit ||
- atomic_read(&user->sigpending) <=
- task_rlimit(t, RLIMIT_SIGPENDING)) {
- - q = kmem_cache_alloc(sigqueue_cachep, flags);
- + if (!fromslab)
- + q = get_task_cache(t);
- + if (!q)
- + q = kmem_cache_alloc(sigqueue_cachep, flags);
- } else {
- print_dropped_signal(sig);
- }
- @@ -392,6 +428,13 @@
- return q;
- }
-
- +static struct sigqueue *
- +__sigqueue_alloc(int sig, struct task_struct *t, gfp_t flags,
- + int override_rlimit)
- +{
- + return __sigqueue_do_alloc(sig, t, flags, override_rlimit, 0);
- +}
- +
- static void __sigqueue_free(struct sigqueue *q)
- {
- if (q->flags & SIGQUEUE_PREALLOC)
- @@ -401,6 +444,21 @@
- kmem_cache_free(sigqueue_cachep, q);
- }
-
- +static void sigqueue_free_current(struct sigqueue *q)
- +{
- + struct user_struct *up;
- +
- + if (q->flags & SIGQUEUE_PREALLOC)
- + return;
- +
- + up = q->user;
- + if (rt_prio(current->normal_prio) && !put_task_cache(current, q)) {
- + atomic_dec(&up->sigpending);
- + free_uid(up);
- + } else
- + __sigqueue_free(q);
- +}
- +
- void flush_sigqueue(struct sigpending *queue)
- {
- struct sigqueue *q;
- @@ -414,6 +472,21 @@
- }
-
- /*
- + * Called from __exit_signal. Flush tsk->pending and
- + * tsk->sigqueue_cache
- + */
- +void flush_task_sigqueue(struct task_struct *tsk)
- +{
- + struct sigqueue *q;
- +
- + flush_sigqueue(&tsk->pending);
- +
- + q = get_task_cache(tsk);
- + if (q)
- + kmem_cache_free(sigqueue_cachep, q);
- +}
- +
- +/*
- * Flush all pending signals for a task.
- */
- void __flush_signals(struct task_struct *t)
- @@ -565,7 +638,7 @@
- still_pending:
- list_del_init(&first->list);
- copy_siginfo(info, &first->info);
- - __sigqueue_free(first);
- + sigqueue_free_current(first);
- } else {
- /*
- * Ok, it wasn't in the queue. This must be
- @@ -611,6 +684,8 @@
- {
- int signr;
-
- + WARN_ON_ONCE(tsk != current);
- +
- /* We only dequeue private signals from ourselves, we don't let
- * signalfd steal them
- */
- @@ -1207,8 +1282,8 @@
- * We don't want to have recursive SIGSEGV's etc, for example,
- * that is why we also clear SIGNAL_UNKILLABLE.
- */
- -int
- -force_sig_info(int sig, struct siginfo *info, struct task_struct *t)
- +static int
- +do_force_sig_info(int sig, struct siginfo *info, struct task_struct *t)
- {
- unsigned long int flags;
- int ret, blocked, ignored;
- @@ -1233,6 +1308,39 @@
- return ret;
- }
-
- +int force_sig_info(int sig, struct siginfo *info, struct task_struct *t)
- +{
- +/*
- + * On some archs, PREEMPT_RT has to delay sending a signal from a trap
- + * since it can not enable preemption, and the signal code's spin_locks
- + * turn into mutexes. Instead, it must set TIF_NOTIFY_RESUME which will
- + * send the signal on exit of the trap.
- + */
- +#ifdef ARCH_RT_DELAYS_SIGNAL_SEND
- + if (in_atomic()) {
- + if (WARN_ON_ONCE(t != current))
- + return 0;
- + if (WARN_ON_ONCE(t->forced_info.si_signo))
- + return 0;
- +
- + if (is_si_special(info)) {
- + WARN_ON_ONCE(info != SEND_SIG_PRIV);
- + t->forced_info.si_signo = sig;
- + t->forced_info.si_errno = 0;
- + t->forced_info.si_code = SI_KERNEL;
- + t->forced_info.si_pid = 0;
- + t->forced_info.si_uid = 0;
- + } else {
- + t->forced_info = *info;
- + }
- +
- + set_tsk_thread_flag(t, TIF_NOTIFY_RESUME);
- + return 0;
- + }
- +#endif
- + return do_force_sig_info(sig, info, t);
- +}
- +
- /*
- * Nuke all other threads in the group.
- */
- @@ -1267,12 +1375,12 @@
- * Disable interrupts early to avoid deadlocks.
- * See rcu_read_unlock() comment header for details.
- */
- - local_irq_save(*flags);
- + local_irq_save_nort(*flags);
- rcu_read_lock();
- sighand = rcu_dereference(tsk->sighand);
- if (unlikely(sighand == NULL)) {
- rcu_read_unlock();
- - local_irq_restore(*flags);
- + local_irq_restore_nort(*flags);
- break;
- }
- /*
- @@ -1293,7 +1401,7 @@
- }
- spin_unlock(&sighand->siglock);
- rcu_read_unlock();
- - local_irq_restore(*flags);
- + local_irq_restore_nort(*flags);
- }
-
- return sighand;
- @@ -1536,7 +1644,8 @@
- */
- struct sigqueue *sigqueue_alloc(void)
- {
- - struct sigqueue *q = __sigqueue_alloc(-1, current, GFP_KERNEL, 0);
- + /* Preallocated sigqueue objects always from the slabcache ! */
- + struct sigqueue *q = __sigqueue_do_alloc(-1, current, GFP_KERNEL, 0, 1);
-
- if (q)
- q->flags |= SIGQUEUE_PREALLOC;
- @@ -1897,15 +2006,7 @@
- if (gstop_done && ptrace_reparented(current))
- do_notify_parent_cldstop(current, false, why);
-
- - /*
- - * Don't want to allow preemption here, because
- - * sys_ptrace() needs this task to be inactive.
- - *
- - * XXX: implement read_unlock_no_resched().
- - */
- - preempt_disable();
- read_unlock(&tasklist_lock);
- - preempt_enable_no_resched();
- freezable_schedule();
- } else {
- /*
- diff -Nur linux-4.1.39.orig/kernel/softirq.c linux-4.1.39/kernel/softirq.c
- --- linux-4.1.39.orig/kernel/softirq.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/softirq.c 2017-04-18 17:56:30.637398061 +0200
- @@ -21,10 +21,12 @@
- #include <linux/freezer.h>
- #include <linux/kthread.h>
- #include <linux/rcupdate.h>
- +#include <linux/delay.h>
- #include <linux/ftrace.h>
- #include <linux/smp.h>
- #include <linux/smpboot.h>
- #include <linux/tick.h>
- +#include <linux/locallock.h>
- #include <linux/irq.h>
-
- #define CREATE_TRACE_POINTS
- @@ -56,12 +58,108 @@
- static struct softirq_action softirq_vec[NR_SOFTIRQS] __cacheline_aligned_in_smp;
-
- DEFINE_PER_CPU(struct task_struct *, ksoftirqd);
- +#ifdef CONFIG_PREEMPT_RT_FULL
- +#define TIMER_SOFTIRQS ((1 << TIMER_SOFTIRQ) | (1 << HRTIMER_SOFTIRQ))
- +DEFINE_PER_CPU(struct task_struct *, ktimer_softirqd);
- +#endif
-
- const char * const softirq_to_name[NR_SOFTIRQS] = {
- "HI", "TIMER", "NET_TX", "NET_RX", "BLOCK", "BLOCK_IOPOLL",
- "TASKLET", "SCHED", "HRTIMER", "RCU"
- };
-
- +#ifdef CONFIG_NO_HZ_COMMON
- +# ifdef CONFIG_PREEMPT_RT_FULL
- +
- +struct softirq_runner {
- + struct task_struct *runner[NR_SOFTIRQS];
- +};
- +
- +static DEFINE_PER_CPU(struct softirq_runner, softirq_runners);
- +
- +static inline void softirq_set_runner(unsigned int sirq)
- +{
- + struct softirq_runner *sr = this_cpu_ptr(&softirq_runners);
- +
- + sr->runner[sirq] = current;
- +}
- +
- +static inline void softirq_clr_runner(unsigned int sirq)
- +{
- + struct softirq_runner *sr = this_cpu_ptr(&softirq_runners);
- +
- + sr->runner[sirq] = NULL;
- +}
- +
- +/*
- + * On preempt-rt a softirq running context might be blocked on a
- + * lock. There might be no other runnable task on this CPU because the
- + * lock owner runs on some other CPU. So we have to go into idle with
- + * the pending bit set. Therefor we need to check this otherwise we
- + * warn about false positives which confuses users and defeats the
- + * whole purpose of this test.
- + *
- + * This code is called with interrupts disabled.
- + */
- +void softirq_check_pending_idle(void)
- +{
- + static int rate_limit;
- + struct softirq_runner *sr = this_cpu_ptr(&softirq_runners);
- + u32 warnpending;
- + int i;
- +
- + if (rate_limit >= 10)
- + return;
- +
- + warnpending = local_softirq_pending() & SOFTIRQ_STOP_IDLE_MASK;
- + for (i = 0; i < NR_SOFTIRQS; i++) {
- + struct task_struct *tsk = sr->runner[i];
- +
- + /*
- + * The wakeup code in rtmutex.c wakes up the task
- + * _before_ it sets pi_blocked_on to NULL under
- + * tsk->pi_lock. So we need to check for both: state
- + * and pi_blocked_on.
- + */
- + if (tsk) {
- + raw_spin_lock(&tsk->pi_lock);
- + if (tsk->pi_blocked_on || tsk->state == TASK_RUNNING) {
- + /* Clear all bits pending in that task */
- + warnpending &= ~(tsk->softirqs_raised);
- + warnpending &= ~(1 << i);
- + }
- + raw_spin_unlock(&tsk->pi_lock);
- + }
- + }
- +
- + if (warnpending) {
- + printk(KERN_ERR "NOHZ: local_softirq_pending %02x\n",
- + warnpending);
- + rate_limit++;
- + }
- +}
- +# else
- +/*
- + * On !PREEMPT_RT we just printk rate limited:
- + */
- +void softirq_check_pending_idle(void)
- +{
- + static int rate_limit;
- +
- + if (rate_limit < 10 &&
- + (local_softirq_pending() & SOFTIRQ_STOP_IDLE_MASK)) {
- + printk(KERN_ERR "NOHZ: local_softirq_pending %02x\n",
- + local_softirq_pending());
- + rate_limit++;
- + }
- +}
- +# endif
- +
- +#else /* !CONFIG_NO_HZ_COMMON */
- +static inline void softirq_set_runner(unsigned int sirq) { }
- +static inline void softirq_clr_runner(unsigned int sirq) { }
- +#endif
- +
- /*
- * we cannot loop indefinitely here to avoid userspace starvation,
- * but we also don't want to introduce a worst case 1/HZ latency
- @@ -77,6 +175,79 @@
- wake_up_process(tsk);
- }
-
- +#ifdef CONFIG_PREEMPT_RT_FULL
- +static void wakeup_timer_softirqd(void)
- +{
- + /* Interrupts are disabled: no need to stop preemption */
- + struct task_struct *tsk = __this_cpu_read(ktimer_softirqd);
- +
- + if (tsk && tsk->state != TASK_RUNNING)
- + wake_up_process(tsk);
- +}
- +#endif
- +
- +static void handle_softirq(unsigned int vec_nr)
- +{
- + struct softirq_action *h = softirq_vec + vec_nr;
- + int prev_count;
- +
- + prev_count = preempt_count();
- +
- + kstat_incr_softirqs_this_cpu(vec_nr);
- +
- + trace_softirq_entry(vec_nr);
- + h->action(h);
- + trace_softirq_exit(vec_nr);
- + if (unlikely(prev_count != preempt_count())) {
- + pr_err("huh, entered softirq %u %s %p with preempt_count %08x, exited with %08x?\n",
- + vec_nr, softirq_to_name[vec_nr], h->action,
- + prev_count, preempt_count());
- + preempt_count_set(prev_count);
- + }
- +}
- +
- +#ifndef CONFIG_PREEMPT_RT_FULL
- +static inline int ksoftirqd_softirq_pending(void)
- +{
- + return local_softirq_pending();
- +}
- +
- +static void handle_pending_softirqs(u32 pending)
- +{
- + struct softirq_action *h = softirq_vec;
- + int softirq_bit;
- +
- + local_irq_enable();
- +
- + h = softirq_vec;
- +
- + while ((softirq_bit = ffs(pending))) {
- + unsigned int vec_nr;
- +
- + h += softirq_bit - 1;
- + vec_nr = h - softirq_vec;
- + handle_softirq(vec_nr);
- +
- + h++;
- + pending >>= softirq_bit;
- + }
- +
- + rcu_bh_qs();
- + local_irq_disable();
- +}
- +
- +static void run_ksoftirqd(unsigned int cpu)
- +{
- + local_irq_disable();
- + if (ksoftirqd_softirq_pending()) {
- + __do_softirq();
- + local_irq_enable();
- + cond_resched_rcu_qs();
- + return;
- + }
- + local_irq_enable();
- +}
- +
- /*
- * preempt_count and SOFTIRQ_OFFSET usage:
- * - preempt_count is changed by SOFTIRQ_OFFSET on entering or leaving
- @@ -116,9 +287,9 @@
-
- if (preempt_count() == cnt) {
- #ifdef CONFIG_DEBUG_PREEMPT
- - current->preempt_disable_ip = get_parent_ip(CALLER_ADDR1);
- + current->preempt_disable_ip = get_lock_parent_ip();
- #endif
- - trace_preempt_off(CALLER_ADDR0, get_parent_ip(CALLER_ADDR1));
- + trace_preempt_off(CALLER_ADDR0, get_lock_parent_ip());
- }
- }
- EXPORT_SYMBOL(__local_bh_disable_ip);
- @@ -232,10 +403,8 @@
- unsigned long end = jiffies + MAX_SOFTIRQ_TIME;
- unsigned long old_flags = current->flags;
- int max_restart = MAX_SOFTIRQ_RESTART;
- - struct softirq_action *h;
- bool in_hardirq;
- __u32 pending;
- - int softirq_bit;
-
- /*
- * Mask out PF_MEMALLOC s current task context is borrowed for the
- @@ -254,36 +423,7 @@
- /* Reset the pending bitmask before enabling irqs */
- set_softirq_pending(0);
-
- - local_irq_enable();
- -
- - h = softirq_vec;
- -
- - while ((softirq_bit = ffs(pending))) {
- - unsigned int vec_nr;
- - int prev_count;
- -
- - h += softirq_bit - 1;
- -
- - vec_nr = h - softirq_vec;
- - prev_count = preempt_count();
- -
- - kstat_incr_softirqs_this_cpu(vec_nr);
- -
- - trace_softirq_entry(vec_nr);
- - h->action(h);
- - trace_softirq_exit(vec_nr);
- - if (unlikely(prev_count != preempt_count())) {
- - pr_err("huh, entered softirq %u %s %p with preempt_count %08x, exited with %08x?\n",
- - vec_nr, softirq_to_name[vec_nr], h->action,
- - prev_count, preempt_count());
- - preempt_count_set(prev_count);
- - }
- - h++;
- - pending >>= softirq_bit;
- - }
- -
- - rcu_bh_qs();
- - local_irq_disable();
- + handle_pending_softirqs(pending);
-
- pending = local_softirq_pending();
- if (pending) {
- @@ -320,6 +460,310 @@
- }
-
- /*
- + * This function must run with irqs disabled!
- + */
- +void raise_softirq_irqoff(unsigned int nr)
- +{
- + __raise_softirq_irqoff(nr);
- +
- + /*
- + * If we're in an interrupt or softirq, we're done
- + * (this also catches softirq-disabled code). We will
- + * actually run the softirq once we return from
- + * the irq or softirq.
- + *
- + * Otherwise we wake up ksoftirqd to make sure we
- + * schedule the softirq soon.
- + */
- + if (!in_interrupt())
- + wakeup_softirqd();
- +}
- +
- +void __raise_softirq_irqoff(unsigned int nr)
- +{
- + trace_softirq_raise(nr);
- + or_softirq_pending(1UL << nr);
- +}
- +
- +static inline void local_bh_disable_nort(void) { local_bh_disable(); }
- +static inline void _local_bh_enable_nort(void) { _local_bh_enable(); }
- +static void ksoftirqd_set_sched_params(unsigned int cpu) { }
- +
- +#else /* !PREEMPT_RT_FULL */
- +
- +/*
- + * On RT we serialize softirq execution with a cpu local lock per softirq
- + */
- +static DEFINE_PER_CPU(struct local_irq_lock [NR_SOFTIRQS], local_softirq_locks);
- +
- +void __init softirq_early_init(void)
- +{
- + int i;
- +
- + for (i = 0; i < NR_SOFTIRQS; i++)
- + local_irq_lock_init(local_softirq_locks[i]);
- +}
- +
- +static void lock_softirq(int which)
- +{
- + local_lock(local_softirq_locks[which]);
- +}
- +
- +static void unlock_softirq(int which)
- +{
- + local_unlock(local_softirq_locks[which]);
- +}
- +
- +static void do_single_softirq(int which)
- +{
- + unsigned long old_flags = current->flags;
- +
- + current->flags &= ~PF_MEMALLOC;
- + vtime_account_irq_enter(current);
- + current->flags |= PF_IN_SOFTIRQ;
- + lockdep_softirq_enter();
- + local_irq_enable();
- + handle_softirq(which);
- + local_irq_disable();
- + lockdep_softirq_exit();
- + current->flags &= ~PF_IN_SOFTIRQ;
- + vtime_account_irq_enter(current);
- + tsk_restore_flags(current, old_flags, PF_MEMALLOC);
- +}
- +
- +/*
- + * Called with interrupts disabled. Process softirqs which were raised
- + * in current context (or on behalf of ksoftirqd).
- + */
- +static void do_current_softirqs(void)
- +{
- + while (current->softirqs_raised) {
- + int i = __ffs(current->softirqs_raised);
- + unsigned int pending, mask = (1U << i);
- +
- + current->softirqs_raised &= ~mask;
- + local_irq_enable();
- +
- + /*
- + * If the lock is contended, we boost the owner to
- + * process the softirq or leave the critical section
- + * now.
- + */
- + lock_softirq(i);
- + local_irq_disable();
- + softirq_set_runner(i);
- + /*
- + * Check with the local_softirq_pending() bits,
- + * whether we need to process this still or if someone
- + * else took care of it.
- + */
- + pending = local_softirq_pending();
- + if (pending & mask) {
- + set_softirq_pending(pending & ~mask);
- + do_single_softirq(i);
- + }
- + softirq_clr_runner(i);
- + WARN_ON(current->softirq_nestcnt != 1);
- + local_irq_enable();
- + unlock_softirq(i);
- + local_irq_disable();
- + }
- +}
- +
- +void __local_bh_disable(void)
- +{
- + if (++current->softirq_nestcnt == 1)
- + migrate_disable();
- +}
- +EXPORT_SYMBOL(__local_bh_disable);
- +
- +void __local_bh_enable(void)
- +{
- + if (WARN_ON(current->softirq_nestcnt == 0))
- + return;
- +
- + local_irq_disable();
- + if (current->softirq_nestcnt == 1 && current->softirqs_raised)
- + do_current_softirqs();
- + local_irq_enable();
- +
- + if (--current->softirq_nestcnt == 0)
- + migrate_enable();
- +}
- +EXPORT_SYMBOL(__local_bh_enable);
- +
- +void _local_bh_enable(void)
- +{
- + if (WARN_ON(current->softirq_nestcnt == 0))
- + return;
- + if (--current->softirq_nestcnt == 0)
- + migrate_enable();
- +}
- +EXPORT_SYMBOL(_local_bh_enable);
- +
- +int in_serving_softirq(void)
- +{
- + return current->flags & PF_IN_SOFTIRQ;
- +}
- +EXPORT_SYMBOL(in_serving_softirq);
- +
- +/* Called with preemption disabled */
- +static void run_ksoftirqd(unsigned int cpu)
- +{
- + local_irq_disable();
- + current->softirq_nestcnt++;
- +
- + do_current_softirqs();
- + current->softirq_nestcnt--;
- + local_irq_enable();
- + cond_resched_rcu_qs();
- +}
- +
- +/*
- + * Called from netif_rx_ni(). Preemption enabled, but migration
- + * disabled. So the cpu can't go away under us.
- + */
- +void thread_do_softirq(void)
- +{
- + if (!in_serving_softirq() && current->softirqs_raised) {
- + current->softirq_nestcnt++;
- + do_current_softirqs();
- + current->softirq_nestcnt--;
- + }
- +}
- +
- +static void do_raise_softirq_irqoff(unsigned int nr)
- +{
- + unsigned int mask;
- +
- + mask = 1UL << nr;
- +
- + trace_softirq_raise(nr);
- + or_softirq_pending(mask);
- +
- + /*
- + * If we are not in a hard interrupt and inside a bh disabled
- + * region, we simply raise the flag on current. local_bh_enable()
- + * will make sure that the softirq is executed. Otherwise we
- + * delegate it to ksoftirqd.
- + */
- + if (!in_irq() && current->softirq_nestcnt)
- + current->softirqs_raised |= mask;
- + else if (!__this_cpu_read(ksoftirqd) || !__this_cpu_read(ktimer_softirqd))
- + return;
- +
- + if (mask & TIMER_SOFTIRQS)
- + __this_cpu_read(ktimer_softirqd)->softirqs_raised |= mask;
- + else
- + __this_cpu_read(ksoftirqd)->softirqs_raised |= mask;
- +}
- +
- +static void wakeup_proper_softirq(unsigned int nr)
- +{
- + if ((1UL << nr) & TIMER_SOFTIRQS)
- + wakeup_timer_softirqd();
- + else
- + wakeup_softirqd();
- +}
- +
- +
- +void __raise_softirq_irqoff(unsigned int nr)
- +{
- + do_raise_softirq_irqoff(nr);
- + if (!in_irq() && !current->softirq_nestcnt)
- + wakeup_proper_softirq(nr);
- +}
- +
- +/*
- + * Same as __raise_softirq_irqoff() but will process them in ksoftirqd
- + */
- +void __raise_softirq_irqoff_ksoft(unsigned int nr)
- +{
- + unsigned int mask;
- +
- + if (WARN_ON_ONCE(!__this_cpu_read(ksoftirqd) ||
- + !__this_cpu_read(ktimer_softirqd)))
- + return;
- + mask = 1UL << nr;
- +
- + trace_softirq_raise(nr);
- + or_softirq_pending(mask);
- + if (mask & TIMER_SOFTIRQS)
- + __this_cpu_read(ktimer_softirqd)->softirqs_raised |= mask;
- + else
- + __this_cpu_read(ksoftirqd)->softirqs_raised |= mask;
- + wakeup_proper_softirq(nr);
- +}
- +
- +/*
- + * This function must run with irqs disabled!
- + */
- +void raise_softirq_irqoff(unsigned int nr)
- +{
- + do_raise_softirq_irqoff(nr);
- +
- + /*
- + * If we're in an hard interrupt we let irq return code deal
- + * with the wakeup of ksoftirqd.
- + */
- + if (in_irq())
- + return;
- + /*
- + * If we are in thread context but outside of a bh disabled
- + * region, we need to wake ksoftirqd as well.
- + *
- + * CHECKME: Some of the places which do that could be wrapped
- + * into local_bh_disable/enable pairs. Though it's unclear
- + * whether this is worth the effort. To find those places just
- + * raise a WARN() if the condition is met.
- + */
- + if (!current->softirq_nestcnt)
- + wakeup_proper_softirq(nr);
- +}
- +
- +static inline int ksoftirqd_softirq_pending(void)
- +{
- + return current->softirqs_raised;
- +}
- +
- +static inline void local_bh_disable_nort(void) { }
- +static inline void _local_bh_enable_nort(void) { }
- +
- +static inline void ksoftirqd_set_sched_params(unsigned int cpu)
- +{
- + /* Take over all but timer pending softirqs when starting */
- + local_irq_disable();
- + current->softirqs_raised = local_softirq_pending() & ~TIMER_SOFTIRQS;
- + local_irq_enable();
- +}
- +
- +static inline void ktimer_softirqd_set_sched_params(unsigned int cpu)
- +{
- + struct sched_param param = { .sched_priority = 1 };
- +
- + sched_setscheduler(current, SCHED_FIFO, ¶m);
- +
- + /* Take over timer pending softirqs when starting */
- + local_irq_disable();
- + current->softirqs_raised = local_softirq_pending() & TIMER_SOFTIRQS;
- + local_irq_enable();
- +}
- +
- +static inline void ktimer_softirqd_clr_sched_params(unsigned int cpu,
- + bool online)
- +{
- + struct sched_param param = { .sched_priority = 0 };
- +
- + sched_setscheduler(current, SCHED_NORMAL, ¶m);
- +}
- +
- +static int ktimer_softirqd_should_run(unsigned int cpu)
- +{
- + return current->softirqs_raised;
- +}
- +
- +#endif /* PREEMPT_RT_FULL */
- +/*
- * Enter an interrupt context.
- */
- void irq_enter(void)
- @@ -330,9 +774,9 @@
- * Prevent raise_softirq from needlessly waking up ksoftirqd
- * here, as softirq will be serviced on return from interrupt.
- */
- - local_bh_disable();
- + local_bh_disable_nort();
- tick_irq_enter();
- - _local_bh_enable();
- + _local_bh_enable_nort();
- }
-
- __irq_enter();
- @@ -340,6 +784,7 @@
-
- static inline void invoke_softirq(void)
- {
- +#ifndef CONFIG_PREEMPT_RT_FULL
- if (!force_irqthreads) {
- #ifdef CONFIG_HAVE_IRQ_EXIT_ON_IRQ_STACK
- /*
- @@ -359,6 +804,18 @@
- } else {
- wakeup_softirqd();
- }
- +#else /* PREEMPT_RT_FULL */
- + unsigned long flags;
- +
- + local_irq_save(flags);
- + if (__this_cpu_read(ksoftirqd) &&
- + __this_cpu_read(ksoftirqd)->softirqs_raised)
- + wakeup_softirqd();
- + if (__this_cpu_read(ktimer_softirqd) &&
- + __this_cpu_read(ktimer_softirqd)->softirqs_raised)
- + wakeup_timer_softirqd();
- + local_irq_restore(flags);
- +#endif
- }
-
- static inline void tick_irq_exit(void)
- @@ -395,26 +852,6 @@
- trace_hardirq_exit(); /* must be last! */
- }
-
- -/*
- - * This function must run with irqs disabled!
- - */
- -inline void raise_softirq_irqoff(unsigned int nr)
- -{
- - __raise_softirq_irqoff(nr);
- -
- - /*
- - * If we're in an interrupt or softirq, we're done
- - * (this also catches softirq-disabled code). We will
- - * actually run the softirq once we return from
- - * the irq or softirq.
- - *
- - * Otherwise we wake up ksoftirqd to make sure we
- - * schedule the softirq soon.
- - */
- - if (!in_interrupt())
- - wakeup_softirqd();
- -}
- -
- void raise_softirq(unsigned int nr)
- {
- unsigned long flags;
- @@ -424,12 +861,6 @@
- local_irq_restore(flags);
- }
-
- -void __raise_softirq_irqoff(unsigned int nr)
- -{
- - trace_softirq_raise(nr);
- - or_softirq_pending(1UL << nr);
- -}
- -
- void open_softirq(int nr, void (*action)(struct softirq_action *))
- {
- softirq_vec[nr].action = action;
- @@ -446,15 +877,45 @@
- static DEFINE_PER_CPU(struct tasklet_head, tasklet_vec);
- static DEFINE_PER_CPU(struct tasklet_head, tasklet_hi_vec);
-
- +static void inline
- +__tasklet_common_schedule(struct tasklet_struct *t, struct tasklet_head *head, unsigned int nr)
- +{
- + if (tasklet_trylock(t)) {
- +again:
- + /* We may have been preempted before tasklet_trylock
- + * and __tasklet_action may have already run.
- + * So double check the sched bit while the takslet
- + * is locked before adding it to the list.
- + */
- + if (test_bit(TASKLET_STATE_SCHED, &t->state)) {
- + t->next = NULL;
- + *head->tail = t;
- + head->tail = &(t->next);
- + raise_softirq_irqoff(nr);
- + tasklet_unlock(t);
- + } else {
- + /* This is subtle. If we hit the corner case above
- + * It is possible that we get preempted right here,
- + * and another task has successfully called
- + * tasklet_schedule(), then this function, and
- + * failed on the trylock. Thus we must be sure
- + * before releasing the tasklet lock, that the
- + * SCHED_BIT is clear. Otherwise the tasklet
- + * may get its SCHED_BIT set, but not added to the
- + * list
- + */
- + if (!tasklet_tryunlock(t))
- + goto again;
- + }
- + }
- +}
- +
- void __tasklet_schedule(struct tasklet_struct *t)
- {
- unsigned long flags;
-
- local_irq_save(flags);
- - t->next = NULL;
- - *__this_cpu_read(tasklet_vec.tail) = t;
- - __this_cpu_write(tasklet_vec.tail, &(t->next));
- - raise_softirq_irqoff(TASKLET_SOFTIRQ);
- + __tasklet_common_schedule(t, this_cpu_ptr(&tasklet_vec), TASKLET_SOFTIRQ);
- local_irq_restore(flags);
- }
- EXPORT_SYMBOL(__tasklet_schedule);
- @@ -464,10 +925,7 @@
- unsigned long flags;
-
- local_irq_save(flags);
- - t->next = NULL;
- - *__this_cpu_read(tasklet_hi_vec.tail) = t;
- - __this_cpu_write(tasklet_hi_vec.tail, &(t->next));
- - raise_softirq_irqoff(HI_SOFTIRQ);
- + __tasklet_common_schedule(t, this_cpu_ptr(&tasklet_hi_vec), HI_SOFTIRQ);
- local_irq_restore(flags);
- }
- EXPORT_SYMBOL(__tasklet_hi_schedule);
- @@ -476,82 +934,122 @@
- {
- BUG_ON(!irqs_disabled());
-
- - t->next = __this_cpu_read(tasklet_hi_vec.head);
- - __this_cpu_write(tasklet_hi_vec.head, t);
- - __raise_softirq_irqoff(HI_SOFTIRQ);
- + __tasklet_hi_schedule(t);
- }
- EXPORT_SYMBOL(__tasklet_hi_schedule_first);
-
- -static void tasklet_action(struct softirq_action *a)
- +void tasklet_enable(struct tasklet_struct *t)
- {
- - struct tasklet_struct *list;
- + if (!atomic_dec_and_test(&t->count))
- + return;
- + if (test_and_clear_bit(TASKLET_STATE_PENDING, &t->state))
- + tasklet_schedule(t);
- +}
- +EXPORT_SYMBOL(tasklet_enable);
-
- - local_irq_disable();
- - list = __this_cpu_read(tasklet_vec.head);
- - __this_cpu_write(tasklet_vec.head, NULL);
- - __this_cpu_write(tasklet_vec.tail, this_cpu_ptr(&tasklet_vec.head));
- - local_irq_enable();
- +static void __tasklet_action(struct softirq_action *a,
- + struct tasklet_struct *list)
- +{
- + int loops = 1000000;
-
- while (list) {
- struct tasklet_struct *t = list;
-
- list = list->next;
-
- - if (tasklet_trylock(t)) {
- - if (!atomic_read(&t->count)) {
- - if (!test_and_clear_bit(TASKLET_STATE_SCHED,
- - &t->state))
- - BUG();
- - t->func(t->data);
- - tasklet_unlock(t);
- - continue;
- - }
- - tasklet_unlock(t);
- + /*
- + * Should always succeed - after a tasklist got on the
- + * list (after getting the SCHED bit set from 0 to 1),
- + * nothing but the tasklet softirq it got queued to can
- + * lock it:
- + */
- + if (!tasklet_trylock(t)) {
- + WARN_ON(1);
- + continue;
- }
-
- - local_irq_disable();
- t->next = NULL;
- - *__this_cpu_read(tasklet_vec.tail) = t;
- - __this_cpu_write(tasklet_vec.tail, &(t->next));
- - __raise_softirq_irqoff(TASKLET_SOFTIRQ);
- - local_irq_enable();
- +
- + /*
- + * If we cannot handle the tasklet because it's disabled,
- + * mark it as pending. tasklet_enable() will later
- + * re-schedule the tasklet.
- + */
- + if (unlikely(atomic_read(&t->count))) {
- +out_disabled:
- + /* implicit unlock: */
- + wmb();
- + t->state = TASKLET_STATEF_PENDING;
- + continue;
- + }
- +
- + /*
- + * After this point on the tasklet might be rescheduled
- + * on another CPU, but it can only be added to another
- + * CPU's tasklet list if we unlock the tasklet (which we
- + * dont do yet).
- + */
- + if (!test_and_clear_bit(TASKLET_STATE_SCHED, &t->state))
- + WARN_ON(1);
- +
- +again:
- + t->func(t->data);
- +
- + /*
- + * Try to unlock the tasklet. We must use cmpxchg, because
- + * another CPU might have scheduled or disabled the tasklet.
- + * We only allow the STATE_RUN -> 0 transition here.
- + */
- + while (!tasklet_tryunlock(t)) {
- + /*
- + * If it got disabled meanwhile, bail out:
- + */
- + if (atomic_read(&t->count))
- + goto out_disabled;
- + /*
- + * If it got scheduled meanwhile, re-execute
- + * the tasklet function:
- + */
- + if (test_and_clear_bit(TASKLET_STATE_SCHED, &t->state))
- + goto again;
- + if (!--loops) {
- + printk("hm, tasklet state: %08lx\n", t->state);
- + WARN_ON(1);
- + tasklet_unlock(t);
- + break;
- + }
- + }
- }
- }
-
- +static void tasklet_action(struct softirq_action *a)
- +{
- + struct tasklet_struct *list;
- +
- + local_irq_disable();
- +
- + list = __this_cpu_read(tasklet_vec.head);
- + __this_cpu_write(tasklet_vec.head, NULL);
- + __this_cpu_write(tasklet_vec.tail, this_cpu_ptr(&tasklet_vec.head));
- +
- + local_irq_enable();
- +
- + __tasklet_action(a, list);
- +}
- +
- static void tasklet_hi_action(struct softirq_action *a)
- {
- struct tasklet_struct *list;
-
- local_irq_disable();
- +
- list = __this_cpu_read(tasklet_hi_vec.head);
- __this_cpu_write(tasklet_hi_vec.head, NULL);
- __this_cpu_write(tasklet_hi_vec.tail, this_cpu_ptr(&tasklet_hi_vec.head));
- - local_irq_enable();
-
- - while (list) {
- - struct tasklet_struct *t = list;
- -
- - list = list->next;
- -
- - if (tasklet_trylock(t)) {
- - if (!atomic_read(&t->count)) {
- - if (!test_and_clear_bit(TASKLET_STATE_SCHED,
- - &t->state))
- - BUG();
- - t->func(t->data);
- - tasklet_unlock(t);
- - continue;
- - }
- - tasklet_unlock(t);
- - }
- + local_irq_enable();
-
- - local_irq_disable();
- - t->next = NULL;
- - *__this_cpu_read(tasklet_hi_vec.tail) = t;
- - __this_cpu_write(tasklet_hi_vec.tail, &(t->next));
- - __raise_softirq_irqoff(HI_SOFTIRQ);
- - local_irq_enable();
- - }
- + __tasklet_action(a, list);
- }
-
- void tasklet_init(struct tasklet_struct *t,
- @@ -572,7 +1070,7 @@
-
- while (test_and_set_bit(TASKLET_STATE_SCHED, &t->state)) {
- do {
- - yield();
- + msleep(1);
- } while (test_bit(TASKLET_STATE_SCHED, &t->state));
- }
- tasklet_unlock_wait(t);
- @@ -646,25 +1144,26 @@
- open_softirq(HI_SOFTIRQ, tasklet_hi_action);
- }
-
- -static int ksoftirqd_should_run(unsigned int cpu)
- -{
- - return local_softirq_pending();
- -}
- -
- -static void run_ksoftirqd(unsigned int cpu)
- +#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_RT_FULL)
- +void tasklet_unlock_wait(struct tasklet_struct *t)
- {
- - local_irq_disable();
- - if (local_softirq_pending()) {
- + while (test_bit(TASKLET_STATE_RUN, &(t)->state)) {
- /*
- - * We can safely run softirq on inline stack, as we are not deep
- - * in the task stack here.
- + * Hack for now to avoid this busy-loop:
- */
- - __do_softirq();
- - local_irq_enable();
- - cond_resched_rcu_qs();
- - return;
- +#ifdef CONFIG_PREEMPT_RT_FULL
- + msleep(1);
- +#else
- + barrier();
- +#endif
- }
- - local_irq_enable();
- +}
- +EXPORT_SYMBOL(tasklet_unlock_wait);
- +#endif
- +
- +static int ksoftirqd_should_run(unsigned int cpu)
- +{
- + return ksoftirqd_softirq_pending();
- }
-
- #ifdef CONFIG_HOTPLUG_CPU
- @@ -746,16 +1245,31 @@
-
- static struct smp_hotplug_thread softirq_threads = {
- .store = &ksoftirqd,
- + .setup = ksoftirqd_set_sched_params,
- .thread_should_run = ksoftirqd_should_run,
- .thread_fn = run_ksoftirqd,
- .thread_comm = "ksoftirqd/%u",
- };
-
- +#ifdef CONFIG_PREEMPT_RT_FULL
- +static struct smp_hotplug_thread softirq_timer_threads = {
- + .store = &ktimer_softirqd,
- + .setup = ktimer_softirqd_set_sched_params,
- + .cleanup = ktimer_softirqd_clr_sched_params,
- + .thread_should_run = ktimer_softirqd_should_run,
- + .thread_fn = run_ksoftirqd,
- + .thread_comm = "ktimersoftd/%u",
- +};
- +#endif
- +
- static __init int spawn_ksoftirqd(void)
- {
- register_cpu_notifier(&cpu_nfb);
-
- BUG_ON(smpboot_register_percpu_thread(&softirq_threads));
- +#ifdef CONFIG_PREEMPT_RT_FULL
- + BUG_ON(smpboot_register_percpu_thread(&softirq_timer_threads));
- +#endif
-
- return 0;
- }
- diff -Nur linux-4.1.39.orig/kernel/stop_machine.c linux-4.1.39/kernel/stop_machine.c
- --- linux-4.1.39.orig/kernel/stop_machine.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/stop_machine.c 2017-04-18 17:56:30.637398061 +0200
- @@ -35,7 +35,7 @@
-
- /* the actual stopper, one per every possible cpu, enabled on online cpus */
- struct cpu_stopper {
- - spinlock_t lock;
- + raw_spinlock_t lock;
- bool enabled; /* is this stopper enabled? */
- struct list_head works; /* list of pending works */
- };
- @@ -78,7 +78,7 @@
-
- unsigned long flags;
-
- - spin_lock_irqsave(&stopper->lock, flags);
- + raw_spin_lock_irqsave(&stopper->lock, flags);
-
- if (stopper->enabled) {
- list_add_tail(&work->list, &stopper->works);
- @@ -86,7 +86,7 @@
- } else
- cpu_stop_signal_done(work->done, false);
-
- - spin_unlock_irqrestore(&stopper->lock, flags);
- + raw_spin_unlock_irqrestore(&stopper->lock, flags);
- }
-
- /**
- @@ -248,7 +248,7 @@
- struct irq_cpu_stop_queue_work_info call_args;
- struct multi_stop_data msdata;
-
- - preempt_disable();
- + preempt_disable_nort();
- msdata = (struct multi_stop_data){
- .fn = fn,
- .data = arg,
- @@ -281,7 +281,7 @@
- * This relies on the stopper workqueues to be FIFO.
- */
- if (!cpu_active(cpu1) || !cpu_active(cpu2)) {
- - preempt_enable();
- + preempt_enable_nort();
- return -ENOENT;
- }
-
- @@ -295,7 +295,7 @@
- &irq_cpu_stop_queue_work,
- &call_args, 1);
- lg_local_unlock(&stop_cpus_lock);
- - preempt_enable();
- + preempt_enable_nort();
-
- wait_for_completion(&done.completion);
-
- @@ -329,7 +329,7 @@
-
- static void queue_stop_cpus_work(const struct cpumask *cpumask,
- cpu_stop_fn_t fn, void *arg,
- - struct cpu_stop_done *done)
- + struct cpu_stop_done *done, bool inactive)
- {
- struct cpu_stop_work *work;
- unsigned int cpu;
- @@ -343,11 +343,13 @@
- }
-
- /*
- - * Disable preemption while queueing to avoid getting
- - * preempted by a stopper which might wait for other stoppers
- - * to enter @fn which can lead to deadlock.
- + * Make sure that all work is queued on all cpus before
- + * any of the cpus can execute it.
- */
- - lg_global_lock(&stop_cpus_lock);
- + if (!inactive)
- + lg_global_lock(&stop_cpus_lock);
- + else
- + lg_global_trylock_relax(&stop_cpus_lock);
- for_each_cpu(cpu, cpumask)
- cpu_stop_queue_work(cpu, &per_cpu(stop_cpus_work, cpu));
- lg_global_unlock(&stop_cpus_lock);
- @@ -359,7 +361,7 @@
- struct cpu_stop_done done;
-
- cpu_stop_init_done(&done, cpumask_weight(cpumask));
- - queue_stop_cpus_work(cpumask, fn, arg, &done);
- + queue_stop_cpus_work(cpumask, fn, arg, &done, false);
- wait_for_completion(&done.completion);
- return done.executed ? done.ret : -ENOENT;
- }
- @@ -439,9 +441,9 @@
- unsigned long flags;
- int run;
-
- - spin_lock_irqsave(&stopper->lock, flags);
- + raw_spin_lock_irqsave(&stopper->lock, flags);
- run = !list_empty(&stopper->works);
- - spin_unlock_irqrestore(&stopper->lock, flags);
- + raw_spin_unlock_irqrestore(&stopper->lock, flags);
- return run;
- }
-
- @@ -453,13 +455,13 @@
-
- repeat:
- work = NULL;
- - spin_lock_irq(&stopper->lock);
- + raw_spin_lock_irq(&stopper->lock);
- if (!list_empty(&stopper->works)) {
- work = list_first_entry(&stopper->works,
- struct cpu_stop_work, list);
- list_del_init(&work->list);
- }
- - spin_unlock_irq(&stopper->lock);
- + raw_spin_unlock_irq(&stopper->lock);
-
- if (work) {
- cpu_stop_fn_t fn = work->fn;
- @@ -467,6 +469,16 @@
- struct cpu_stop_done *done = work->done;
- char ksym_buf[KSYM_NAME_LEN] __maybe_unused;
-
- + /*
- + * Wait until the stopper finished scheduling on all
- + * cpus
- + */
- + lg_global_lock(&stop_cpus_lock);
- + /*
- + * Let other cpu threads continue as well
- + */
- + lg_global_unlock(&stop_cpus_lock);
- +
- /* cpu stop callbacks are not allowed to sleep */
- preempt_disable();
-
- @@ -500,20 +512,20 @@
- unsigned long flags;
-
- /* drain remaining works */
- - spin_lock_irqsave(&stopper->lock, flags);
- + raw_spin_lock_irqsave(&stopper->lock, flags);
- list_for_each_entry(work, &stopper->works, list)
- cpu_stop_signal_done(work->done, false);
- stopper->enabled = false;
- - spin_unlock_irqrestore(&stopper->lock, flags);
- + raw_spin_unlock_irqrestore(&stopper->lock, flags);
- }
-
- static void cpu_stop_unpark(unsigned int cpu)
- {
- struct cpu_stopper *stopper = &per_cpu(cpu_stopper, cpu);
-
- - spin_lock_irq(&stopper->lock);
- + raw_spin_lock_irq(&stopper->lock);
- stopper->enabled = true;
- - spin_unlock_irq(&stopper->lock);
- + raw_spin_unlock_irq(&stopper->lock);
- }
-
- static struct smp_hotplug_thread cpu_stop_threads = {
- @@ -535,10 +547,12 @@
- for_each_possible_cpu(cpu) {
- struct cpu_stopper *stopper = &per_cpu(cpu_stopper, cpu);
-
- - spin_lock_init(&stopper->lock);
- + raw_spin_lock_init(&stopper->lock);
- INIT_LIST_HEAD(&stopper->works);
- }
-
- + lg_lock_init(&stop_cpus_lock, "stop_cpus_lock");
- +
- BUG_ON(smpboot_register_percpu_thread(&cpu_stop_threads));
- stop_machine_initialized = true;
- return 0;
- @@ -634,7 +648,7 @@
- set_state(&msdata, MULTI_STOP_PREPARE);
- cpu_stop_init_done(&done, num_active_cpus());
- queue_stop_cpus_work(cpu_active_mask, multi_cpu_stop, &msdata,
- - &done);
- + &done, true);
- ret = multi_cpu_stop(&msdata);
-
- /* Busy wait for completion. */
- diff -Nur linux-4.1.39.orig/kernel/time/hrtimer.c linux-4.1.39/kernel/time/hrtimer.c
- --- linux-4.1.39.orig/kernel/time/hrtimer.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/time/hrtimer.c 2017-04-18 17:56:30.637398061 +0200
- @@ -48,11 +48,13 @@
- #include <linux/sched/rt.h>
- #include <linux/sched/deadline.h>
- #include <linux/timer.h>
- +#include <linux/kthread.h>
- #include <linux/freezer.h>
-
- #include <asm/uaccess.h>
-
- #include <trace/events/timer.h>
- +#include <trace/events/hist.h>
-
- #include "tick-internal.h"
-
- @@ -576,8 +578,7 @@
- * When the callback is running, we do not reprogram the clock event
- * device. The timer callback is either running on a different CPU or
- * the callback is executed in the hrtimer_interrupt context. The
- - * reprogramming is handled either by the softirq, which called the
- - * callback or at the end of the hrtimer_interrupt.
- + * reprogramming is handled at the end of the hrtimer_interrupt.
- */
- if (hrtimer_callback_running(timer))
- return 0;
- @@ -621,6 +622,9 @@
- return res;
- }
-
- +static void __run_hrtimer(struct hrtimer *timer, ktime_t *now);
- +static int hrtimer_rt_defer(struct hrtimer *timer);
- +
- /*
- * Initialize the high resolution related parts of cpu_base
- */
- @@ -630,6 +634,21 @@
- base->hres_active = 0;
- }
-
- +static inline int hrtimer_enqueue_reprogram(struct hrtimer *timer,
- + struct hrtimer_clock_base *base,
- + int wakeup)
- +{
- + if (!hrtimer_reprogram(timer, base))
- + return 0;
- + if (!wakeup)
- + return -ETIME;
- +#ifdef CONFIG_PREEMPT_RT_BASE
- + if (!hrtimer_rt_defer(timer))
- + return -ETIME;
- +#endif
- + return 1;
- +}
- +
- static inline ktime_t hrtimer_update_base(struct hrtimer_cpu_base *base)
- {
- ktime_t *offs_real = &base->clock_base[HRTIMER_BASE_REALTIME].offset;
- @@ -695,6 +714,44 @@
-
- static DECLARE_WORK(hrtimer_work, clock_was_set_work);
-
- +#ifdef CONFIG_PREEMPT_RT_FULL
- +/*
- + * RT can not call schedule_work from real interrupt context.
- + * Need to make a thread to do the real work.
- + */
- +static struct task_struct *clock_set_delay_thread;
- +static bool do_clock_set_delay;
- +
- +static int run_clock_set_delay(void *ignore)
- +{
- + while (!kthread_should_stop()) {
- + set_current_state(TASK_INTERRUPTIBLE);
- + if (do_clock_set_delay) {
- + do_clock_set_delay = false;
- + schedule_work(&hrtimer_work);
- + }
- + schedule();
- + }
- + __set_current_state(TASK_RUNNING);
- + return 0;
- +}
- +
- +void clock_was_set_delayed(void)
- +{
- + do_clock_set_delay = true;
- + /* Make visible before waking up process */
- + smp_wmb();
- + wake_up_process(clock_set_delay_thread);
- +}
- +
- +static __init int create_clock_set_delay_thread(void)
- +{
- + clock_set_delay_thread = kthread_run(run_clock_set_delay, NULL, "kclksetdelayd");
- + BUG_ON(!clock_set_delay_thread);
- + return 0;
- +}
- +early_initcall(create_clock_set_delay_thread);
- +#else /* PREEMPT_RT_FULL */
- /*
- * Called from timekeeping and resume code to reprogramm the hrtimer
- * interrupt device on all cpus.
- @@ -703,6 +760,7 @@
- {
- schedule_work(&hrtimer_work);
- }
- +#endif
-
- #else
-
- @@ -711,6 +769,13 @@
- static inline int hrtimer_switch_to_hres(void) { return 0; }
- static inline void
- hrtimer_force_reprogram(struct hrtimer_cpu_base *base, int skip_equal) { }
- +static inline int hrtimer_enqueue_reprogram(struct hrtimer *timer,
- + struct hrtimer_clock_base *base,
- + int wakeup)
- +{
- + return 0;
- +}
- +
- static inline int hrtimer_reprogram(struct hrtimer *timer,
- struct hrtimer_clock_base *base)
- {
- @@ -718,7 +783,6 @@
- }
- static inline void hrtimer_init_hres(struct hrtimer_cpu_base *base) { }
- static inline void retrigger_next_event(void *arg) { }
- -
- #endif /* CONFIG_HIGH_RES_TIMERS */
-
- /*
- @@ -836,6 +900,32 @@
- }
- EXPORT_SYMBOL_GPL(hrtimer_forward);
-
- +#ifdef CONFIG_PREEMPT_RT_BASE
- +# define wake_up_timer_waiters(b) wake_up(&(b)->wait)
- +
- +/**
- + * hrtimer_wait_for_timer - Wait for a running timer
- + *
- + * @timer: timer to wait for
- + *
- + * The function waits in case the timers callback function is
- + * currently executed on the waitqueue of the timer base. The
- + * waitqueue is woken up after the timer callback function has
- + * finished execution.
- + */
- +void hrtimer_wait_for_timer(const struct hrtimer *timer)
- +{
- + struct hrtimer_clock_base *base = timer->base;
- +
- + if (base && base->cpu_base && !timer->irqsafe)
- + wait_event(base->cpu_base->wait,
- + !(timer->state & HRTIMER_STATE_CALLBACK));
- +}
- +
- +#else
- +# define wake_up_timer_waiters(b) do { } while (0)
- +#endif
- +
- /*
- * enqueue_hrtimer - internal function to (re)start a timer
- *
- @@ -879,6 +969,11 @@
- if (!(timer->state & HRTIMER_STATE_ENQUEUED))
- goto out;
-
- + if (unlikely(!list_empty(&timer->cb_entry))) {
- + list_del_init(&timer->cb_entry);
- + goto out;
- + }
- +
- next_timer = timerqueue_getnext(&base->active);
- timerqueue_del(&base->active, &timer->node);
- if (&timer->node == next_timer) {
- @@ -966,7 +1061,16 @@
- new_base = switch_hrtimer_base(timer, base, mode & HRTIMER_MODE_PINNED);
-
- timer_stats_hrtimer_set_start_info(timer);
- +#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST
- + {
- + ktime_t now = new_base->get_time();
-
- + if (ktime_to_ns(tim) < ktime_to_ns(now))
- + timer->praecox = now;
- + else
- + timer->praecox = ktime_set(0, 0);
- + }
- +#endif
- leftmost = enqueue_hrtimer(timer, new_base);
-
- if (!leftmost) {
- @@ -980,15 +1084,26 @@
- * on dynticks target.
- */
- wake_up_nohz_cpu(new_base->cpu_base->cpu);
- - } else if (new_base->cpu_base == this_cpu_ptr(&hrtimer_bases) &&
- - hrtimer_reprogram(timer, new_base)) {
- + } else if (new_base->cpu_base == this_cpu_ptr(&hrtimer_bases)) {
- +
- + ret = hrtimer_enqueue_reprogram(timer, new_base, wakeup);
- + if (ret < 0) {
- + /*
- + * In case we failed to reprogram the timer (mostly
- + * because out current timer is already elapsed),
- + * remove it again and report a failure. This avoids
- + * stale base->first entries.
- + */
- + debug_deactivate(timer);
- + __remove_hrtimer(timer, new_base,
- + timer->state & HRTIMER_STATE_CALLBACK, 0);
- + } else if (ret > 0) {
- /*
- * Only allow reprogramming if the new base is on this CPU.
- * (it might still be on another CPU if the timer was pending)
- *
- * XXX send_remote_softirq() ?
- */
- - if (wakeup) {
- /*
- * We need to drop cpu_base->lock to avoid a
- * lock ordering issue vs. rq->lock.
- @@ -996,9 +1111,7 @@
- raw_spin_unlock(&new_base->cpu_base->lock);
- raise_softirq_irqoff(HRTIMER_SOFTIRQ);
- local_irq_restore(flags);
- - return ret;
- - } else {
- - __raise_softirq_irqoff(HRTIMER_SOFTIRQ);
- + return 0;
- }
- }
-
- @@ -1089,7 +1202,7 @@
-
- if (ret >= 0)
- return ret;
- - cpu_relax();
- + hrtimer_wait_for_timer(timer);
- }
- }
- EXPORT_SYMBOL_GPL(hrtimer_cancel);
- @@ -1153,6 +1266,7 @@
-
- base = hrtimer_clockid_to_base(clock_id);
- timer->base = &cpu_base->clock_base[base];
- + INIT_LIST_HEAD(&timer->cb_entry);
- timerqueue_init(&timer->node);
-
- #ifdef CONFIG_TIMER_STATS
- @@ -1236,6 +1350,126 @@
- timer->state &= ~HRTIMER_STATE_CALLBACK;
- }
-
- +static enum hrtimer_restart hrtimer_wakeup(struct hrtimer *timer);
- +
- +#ifdef CONFIG_PREEMPT_RT_BASE
- +static void hrtimer_rt_reprogram(int restart, struct hrtimer *timer,
- + struct hrtimer_clock_base *base)
- +{
- + /*
- + * Note, we clear the callback flag before we requeue the
- + * timer otherwise we trigger the callback_running() check
- + * in hrtimer_reprogram().
- + */
- + timer->state &= ~HRTIMER_STATE_CALLBACK;
- +
- + if (restart != HRTIMER_NORESTART) {
- + BUG_ON(hrtimer_active(timer));
- + /*
- + * Enqueue the timer, if it's the leftmost timer then
- + * we need to reprogram it.
- + */
- + if (!enqueue_hrtimer(timer, base))
- + return;
- +
- +#ifndef CONFIG_HIGH_RES_TIMERS
- + }
- +#else
- + if (base->cpu_base->hres_active &&
- + hrtimer_reprogram(timer, base))
- + goto requeue;
- +
- + } else if (hrtimer_active(timer)) {
- + /*
- + * If the timer was rearmed on another CPU, reprogram
- + * the event device.
- + */
- + if (&timer->node == base->active.next &&
- + base->cpu_base->hres_active &&
- + hrtimer_reprogram(timer, base))
- + goto requeue;
- + }
- + return;
- +
- +requeue:
- + /*
- + * Timer is expired. Thus move it from tree to pending list
- + * again.
- + */
- + __remove_hrtimer(timer, base, timer->state, 0);
- + list_add_tail(&timer->cb_entry, &base->expired);
- +#endif
- +}
- +
- +/*
- + * The changes in mainline which removed the callback modes from
- + * hrtimer are not yet working with -rt. The non wakeup_process()
- + * based callbacks which involve sleeping locks need to be treated
- + * seperately.
- + */
- +static void hrtimer_rt_run_pending(void)
- +{
- + enum hrtimer_restart (*fn)(struct hrtimer *);
- + struct hrtimer_cpu_base *cpu_base;
- + struct hrtimer_clock_base *base;
- + struct hrtimer *timer;
- + int index, restart;
- +
- + local_irq_disable();
- + cpu_base = &per_cpu(hrtimer_bases, smp_processor_id());
- +
- + raw_spin_lock(&cpu_base->lock);
- +
- + for (index = 0; index < HRTIMER_MAX_CLOCK_BASES; index++) {
- + base = &cpu_base->clock_base[index];
- +
- + while (!list_empty(&base->expired)) {
- + timer = list_first_entry(&base->expired,
- + struct hrtimer, cb_entry);
- +
- + /*
- + * Same as the above __run_hrtimer function
- + * just we run with interrupts enabled.
- + */
- + debug_hrtimer_deactivate(timer);
- + __remove_hrtimer(timer, base, HRTIMER_STATE_CALLBACK, 0);
- + timer_stats_account_hrtimer(timer);
- + fn = timer->function;
- +
- + raw_spin_unlock_irq(&cpu_base->lock);
- + restart = fn(timer);
- + raw_spin_lock_irq(&cpu_base->lock);
- +
- + hrtimer_rt_reprogram(restart, timer, base);
- + }
- + }
- +
- + raw_spin_unlock_irq(&cpu_base->lock);
- +
- + wake_up_timer_waiters(cpu_base);
- +}
- +
- +static int hrtimer_rt_defer(struct hrtimer *timer)
- +{
- + if (timer->irqsafe)
- + return 0;
- +
- + __remove_hrtimer(timer, timer->base, timer->state, 0);
- + list_add_tail(&timer->cb_entry, &timer->base->expired);
- + return 1;
- +}
- +
- +#else
- +
- +static inline void hrtimer_rt_run_pending(void)
- +{
- + hrtimer_peek_ahead_timers();
- +}
- +
- +static inline int hrtimer_rt_defer(struct hrtimer *timer) { return 0; }
- +
- +#endif
- +
- #ifdef CONFIG_HIGH_RES_TIMERS
-
- /*
- @@ -1246,7 +1480,7 @@
- {
- struct hrtimer_cpu_base *cpu_base = this_cpu_ptr(&hrtimer_bases);
- ktime_t expires_next, now, entry_time, delta;
- - int i, retries = 0;
- + int i, retries = 0, raise = 0;
-
- BUG_ON(!cpu_base->hres_active);
- cpu_base->nr_events++;
- @@ -1281,6 +1515,15 @@
-
- timer = container_of(node, struct hrtimer, node);
-
- + trace_hrtimer_interrupt(raw_smp_processor_id(),
- + ktime_to_ns(ktime_sub(ktime_to_ns(timer->praecox) ?
- + timer->praecox : hrtimer_get_expires(timer),
- + basenow)),
- + current,
- + timer->function == hrtimer_wakeup ?
- + container_of(timer, struct hrtimer_sleeper,
- + timer)->task : NULL);
- +
- /*
- * The immediate goal for using the softexpires is
- * minimizing wakeups, not running timers at the
- @@ -1296,7 +1539,10 @@
- if (basenow.tv64 < hrtimer_get_softexpires_tv64(timer))
- break;
-
- - __run_hrtimer(timer, &basenow);
- + if (!hrtimer_rt_defer(timer))
- + __run_hrtimer(timer, &basenow);
- + else
- + raise = 1;
- }
- }
- /* Reevaluate the clock bases for the next expiry */
- @@ -1313,7 +1559,7 @@
- if (expires_next.tv64 == KTIME_MAX ||
- !tick_program_event(expires_next, 0)) {
- cpu_base->hang_detected = 0;
- - return;
- + goto out;
- }
-
- /*
- @@ -1357,6 +1603,9 @@
- tick_program_event(expires_next, 1);
- printk_once(KERN_WARNING "hrtimer: interrupt took %llu ns\n",
- ktime_to_ns(delta));
- +out:
- + if (raise)
- + raise_softirq_irqoff(HRTIMER_SOFTIRQ);
- }
-
- /*
- @@ -1392,18 +1641,18 @@
- __hrtimer_peek_ahead_timers();
- local_irq_restore(flags);
- }
- -
- -static void run_hrtimer_softirq(struct softirq_action *h)
- -{
- - hrtimer_peek_ahead_timers();
- -}
- -
- #else /* CONFIG_HIGH_RES_TIMERS */
-
- static inline void __hrtimer_peek_ahead_timers(void) { }
-
- #endif /* !CONFIG_HIGH_RES_TIMERS */
-
- +
- +static void run_hrtimer_softirq(struct softirq_action *h)
- +{
- + hrtimer_rt_run_pending();
- +}
- +
- /*
- * Called from timer softirq every jiffy, expire hrtimers:
- *
- @@ -1436,7 +1685,7 @@
- struct timerqueue_node *node;
- struct hrtimer_cpu_base *cpu_base = this_cpu_ptr(&hrtimer_bases);
- struct hrtimer_clock_base *base;
- - int index, gettime = 1;
- + int index, gettime = 1, raise = 0;
-
- if (hrtimer_hres_active())
- return;
- @@ -1461,10 +1710,16 @@
- hrtimer_get_expires_tv64(timer))
- break;
-
- - __run_hrtimer(timer, &base->softirq_time);
- + if (!hrtimer_rt_defer(timer))
- + __run_hrtimer(timer, &base->softirq_time);
- + else
- + raise = 1;
- }
- raw_spin_unlock(&cpu_base->lock);
- }
- +
- + if (raise)
- + raise_softirq_irqoff(HRTIMER_SOFTIRQ);
- }
-
- /*
- @@ -1486,16 +1741,18 @@
- void hrtimer_init_sleeper(struct hrtimer_sleeper *sl, struct task_struct *task)
- {
- sl->timer.function = hrtimer_wakeup;
- + sl->timer.irqsafe = 1;
- sl->task = task;
- }
- EXPORT_SYMBOL_GPL(hrtimer_init_sleeper);
-
- -static int __sched do_nanosleep(struct hrtimer_sleeper *t, enum hrtimer_mode mode)
- +static int __sched do_nanosleep(struct hrtimer_sleeper *t, enum hrtimer_mode mode,
- + unsigned long state)
- {
- hrtimer_init_sleeper(t, current);
-
- do {
- - set_current_state(TASK_INTERRUPTIBLE);
- + set_current_state(state);
- hrtimer_start_expires(&t->timer, mode);
- if (!hrtimer_active(&t->timer))
- t->task = NULL;
- @@ -1539,7 +1796,8 @@
- HRTIMER_MODE_ABS);
- hrtimer_set_expires_tv64(&t.timer, restart->nanosleep.expires);
-
- - if (do_nanosleep(&t, HRTIMER_MODE_ABS))
- + /* cpu_chill() does not care about restart state. */
- + if (do_nanosleep(&t, HRTIMER_MODE_ABS, TASK_INTERRUPTIBLE))
- goto out;
-
- rmtp = restart->nanosleep.rmtp;
- @@ -1556,8 +1814,10 @@
- return ret;
- }
-
- -long hrtimer_nanosleep(struct timespec *rqtp, struct timespec __user *rmtp,
- - const enum hrtimer_mode mode, const clockid_t clockid)
- +static long
- +__hrtimer_nanosleep(struct timespec *rqtp, struct timespec __user *rmtp,
- + const enum hrtimer_mode mode, const clockid_t clockid,
- + unsigned long state)
- {
- struct restart_block *restart;
- struct hrtimer_sleeper t;
- @@ -1570,7 +1830,7 @@
-
- hrtimer_init_on_stack(&t.timer, clockid, mode);
- hrtimer_set_expires_range_ns(&t.timer, timespec_to_ktime(*rqtp), slack);
- - if (do_nanosleep(&t, mode))
- + if (do_nanosleep(&t, mode, state))
- goto out;
-
- /* Absolute timers do not update the rmtp value and restart: */
- @@ -1597,6 +1857,12 @@
- return ret;
- }
-
- +long hrtimer_nanosleep(struct timespec *rqtp, struct timespec __user *rmtp,
- + const enum hrtimer_mode mode, const clockid_t clockid)
- +{
- + return __hrtimer_nanosleep(rqtp, rmtp, mode, clockid, TASK_INTERRUPTIBLE);
- +}
- +
- SYSCALL_DEFINE2(nanosleep, struct timespec __user *, rqtp,
- struct timespec __user *, rmtp)
- {
- @@ -1611,6 +1877,26 @@
- return hrtimer_nanosleep(&tu, rmtp, HRTIMER_MODE_REL, CLOCK_MONOTONIC);
- }
-
- +#ifdef CONFIG_PREEMPT_RT_FULL
- +/*
- + * Sleep for 1 ms in hope whoever holds what we want will let it go.
- + */
- +void cpu_chill(void)
- +{
- + struct timespec tu = {
- + .tv_nsec = NSEC_PER_MSEC,
- + };
- + unsigned int freeze_flag = current->flags & PF_NOFREEZE;
- +
- + current->flags |= PF_NOFREEZE;
- + __hrtimer_nanosleep(&tu, NULL, HRTIMER_MODE_REL, CLOCK_MONOTONIC,
- + TASK_UNINTERRUPTIBLE);
- + if (!freeze_flag)
- + current->flags &= ~PF_NOFREEZE;
- +}
- +EXPORT_SYMBOL(cpu_chill);
- +#endif
- +
- /*
- * Functions related to boot-time initialization:
- */
- @@ -1622,10 +1908,14 @@
- for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) {
- cpu_base->clock_base[i].cpu_base = cpu_base;
- timerqueue_init_head(&cpu_base->clock_base[i].active);
- + INIT_LIST_HEAD(&cpu_base->clock_base[i].expired);
- }
-
- cpu_base->cpu = cpu;
- hrtimer_init_hres(cpu_base);
- +#ifdef CONFIG_PREEMPT_RT_BASE
- + init_waitqueue_head(&cpu_base->wait);
- +#endif
- }
-
- #ifdef CONFIG_HOTPLUG_CPU
- @@ -1731,9 +2021,7 @@
- hrtimer_cpu_notify(&hrtimers_nb, (unsigned long)CPU_UP_PREPARE,
- (void *)(long)smp_processor_id());
- register_cpu_notifier(&hrtimers_nb);
- -#ifdef CONFIG_HIGH_RES_TIMERS
- open_softirq(HRTIMER_SOFTIRQ, run_hrtimer_softirq);
- -#endif
- }
-
- /**
- diff -Nur linux-4.1.39.orig/kernel/time/itimer.c linux-4.1.39/kernel/time/itimer.c
- --- linux-4.1.39.orig/kernel/time/itimer.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/time/itimer.c 2017-04-18 17:56:30.637398061 +0200
- @@ -213,6 +213,7 @@
- /* We are sharing ->siglock with it_real_fn() */
- if (hrtimer_try_to_cancel(timer) < 0) {
- spin_unlock_irq(&tsk->sighand->siglock);
- + hrtimer_wait_for_timer(&tsk->signal->real_timer);
- goto again;
- }
- expires = timeval_to_ktime(value->it_value);
- diff -Nur linux-4.1.39.orig/kernel/time/jiffies.c linux-4.1.39/kernel/time/jiffies.c
- --- linux-4.1.39.orig/kernel/time/jiffies.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/time/jiffies.c 2017-04-18 17:56:30.637398061 +0200
- @@ -74,7 +74,8 @@
- .max_cycles = 10,
- };
-
- -__cacheline_aligned_in_smp DEFINE_SEQLOCK(jiffies_lock);
- +__cacheline_aligned_in_smp DEFINE_RAW_SPINLOCK(jiffies_lock);
- +__cacheline_aligned_in_smp seqcount_t jiffies_seq;
-
- #if (BITS_PER_LONG < 64)
- u64 get_jiffies_64(void)
- @@ -83,9 +84,9 @@
- u64 ret;
-
- do {
- - seq = read_seqbegin(&jiffies_lock);
- + seq = read_seqcount_begin(&jiffies_seq);
- ret = jiffies_64;
- - } while (read_seqretry(&jiffies_lock, seq));
- + } while (read_seqcount_retry(&jiffies_seq, seq));
- return ret;
- }
- EXPORT_SYMBOL(get_jiffies_64);
- diff -Nur linux-4.1.39.orig/kernel/time/ntp.c linux-4.1.39/kernel/time/ntp.c
- --- linux-4.1.39.orig/kernel/time/ntp.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/time/ntp.c 2017-04-18 17:56:30.637398061 +0200
- @@ -10,6 +10,7 @@
- #include <linux/workqueue.h>
- #include <linux/hrtimer.h>
- #include <linux/jiffies.h>
- +#include <linux/kthread.h>
- #include <linux/math64.h>
- #include <linux/timex.h>
- #include <linux/time.h>
- @@ -529,10 +530,52 @@
- &sync_cmos_work, timespec_to_jiffies(&next));
- }
-
- +#ifdef CONFIG_PREEMPT_RT_FULL
- +/*
- + * RT can not call schedule_delayed_work from real interrupt context.
- + * Need to make a thread to do the real work.
- + */
- +static struct task_struct *cmos_delay_thread;
- +static bool do_cmos_delay;
- +
- +static int run_cmos_delay(void *ignore)
- +{
- + while (!kthread_should_stop()) {
- + set_current_state(TASK_INTERRUPTIBLE);
- + if (do_cmos_delay) {
- + do_cmos_delay = false;
- + queue_delayed_work(system_power_efficient_wq,
- + &sync_cmos_work, 0);
- + }
- + schedule();
- + }
- + __set_current_state(TASK_RUNNING);
- + return 0;
- +}
- +
- +void ntp_notify_cmos_timer(void)
- +{
- + do_cmos_delay = true;
- + /* Make visible before waking up process */
- + smp_wmb();
- + wake_up_process(cmos_delay_thread);
- +}
- +
- +static __init int create_cmos_delay_thread(void)
- +{
- + cmos_delay_thread = kthread_run(run_cmos_delay, NULL, "kcmosdelayd");
- + BUG_ON(!cmos_delay_thread);
- + return 0;
- +}
- +early_initcall(create_cmos_delay_thread);
- +
- +#else
- +
- void ntp_notify_cmos_timer(void)
- {
- queue_delayed_work(system_power_efficient_wq, &sync_cmos_work, 0);
- }
- +#endif /* CONFIG_PREEMPT_RT_FULL */
-
- #else
- void ntp_notify_cmos_timer(void) { }
- diff -Nur linux-4.1.39.orig/kernel/time/posix-cpu-timers.c linux-4.1.39/kernel/time/posix-cpu-timers.c
- --- linux-4.1.39.orig/kernel/time/posix-cpu-timers.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/time/posix-cpu-timers.c 2017-04-18 17:56:30.641398216 +0200
- @@ -3,6 +3,7 @@
- */
-
- #include <linux/sched.h>
- +#include <linux/sched/rt.h>
- #include <linux/posix-timers.h>
- #include <linux/errno.h>
- #include <linux/math64.h>
- @@ -626,7 +627,7 @@
- /*
- * Disarm any old timer after extracting its expiry time.
- */
- - WARN_ON_ONCE(!irqs_disabled());
- + WARN_ON_ONCE_NONRT(!irqs_disabled());
-
- ret = 0;
- old_incr = timer->it.cpu.incr;
- @@ -1048,7 +1049,7 @@
- /*
- * Now re-arm for the new expiry time.
- */
- - WARN_ON_ONCE(!irqs_disabled());
- + WARN_ON_ONCE_NONRT(!irqs_disabled());
- arm_timer(timer);
- unlock_task_sighand(p, &flags);
-
- @@ -1114,10 +1115,11 @@
- sig = tsk->signal;
- if (sig->cputimer.running) {
- struct task_cputime group_sample;
- + unsigned long flags;
-
- - raw_spin_lock(&sig->cputimer.lock);
- + raw_spin_lock_irqsave(&sig->cputimer.lock, flags);
- group_sample = sig->cputimer.cputime;
- - raw_spin_unlock(&sig->cputimer.lock);
- + raw_spin_unlock_irqrestore(&sig->cputimer.lock, flags);
-
- if (task_cputime_expired(&group_sample, &sig->cputime_expires))
- return 1;
- @@ -1131,13 +1133,13 @@
- * already updated our counts. We need to check if any timers fire now.
- * Interrupts are disabled.
- */
- -void run_posix_cpu_timers(struct task_struct *tsk)
- +static void __run_posix_cpu_timers(struct task_struct *tsk)
- {
- LIST_HEAD(firing);
- struct k_itimer *timer, *next;
- unsigned long flags;
-
- - WARN_ON_ONCE(!irqs_disabled());
- + WARN_ON_ONCE_NONRT(!irqs_disabled());
-
- /*
- * The fast path checks that there are no expired thread or thread
- @@ -1195,6 +1197,190 @@
- }
- }
-
- +#ifdef CONFIG_PREEMPT_RT_BASE
- +#include <linux/kthread.h>
- +#include <linux/cpu.h>
- +DEFINE_PER_CPU(struct task_struct *, posix_timer_task);
- +DEFINE_PER_CPU(struct task_struct *, posix_timer_tasklist);
- +
- +static int posix_cpu_timers_thread(void *data)
- +{
- + int cpu = (long)data;
- +
- + BUG_ON(per_cpu(posix_timer_task,cpu) != current);
- +
- + while (!kthread_should_stop()) {
- + struct task_struct *tsk = NULL;
- + struct task_struct *next = NULL;
- +
- + if (cpu_is_offline(cpu))
- + goto wait_to_die;
- +
- + /* grab task list */
- + raw_local_irq_disable();
- + tsk = per_cpu(posix_timer_tasklist, cpu);
- + per_cpu(posix_timer_tasklist, cpu) = NULL;
- + raw_local_irq_enable();
- +
- + /* its possible the list is empty, just return */
- + if (!tsk) {
- + set_current_state(TASK_INTERRUPTIBLE);
- + schedule();
- + __set_current_state(TASK_RUNNING);
- + continue;
- + }
- +
- + /* Process task list */
- + while (1) {
- + /* save next */
- + next = tsk->posix_timer_list;
- +
- + /* run the task timers, clear its ptr and
- + * unreference it
- + */
- + __run_posix_cpu_timers(tsk);
- + tsk->posix_timer_list = NULL;
- + put_task_struct(tsk);
- +
- + /* check if this is the last on the list */
- + if (next == tsk)
- + break;
- + tsk = next;
- + }
- + }
- + return 0;
- +
- +wait_to_die:
- + /* Wait for kthread_stop */
- + set_current_state(TASK_INTERRUPTIBLE);
- + while (!kthread_should_stop()) {
- + schedule();
- + set_current_state(TASK_INTERRUPTIBLE);
- + }
- + __set_current_state(TASK_RUNNING);
- + return 0;
- +}
- +
- +static inline int __fastpath_timer_check(struct task_struct *tsk)
- +{
- + /* tsk == current, ensure it is safe to use ->signal/sighand */
- + if (unlikely(tsk->exit_state))
- + return 0;
- +
- + if (!task_cputime_zero(&tsk->cputime_expires))
- + return 1;
- +
- + if (!task_cputime_zero(&tsk->signal->cputime_expires))
- + return 1;
- +
- + return 0;
- +}
- +
- +void run_posix_cpu_timers(struct task_struct *tsk)
- +{
- + unsigned long cpu = smp_processor_id();
- + struct task_struct *tasklist;
- +
- + BUG_ON(!irqs_disabled());
- + if(!per_cpu(posix_timer_task, cpu))
- + return;
- + /* get per-cpu references */
- + tasklist = per_cpu(posix_timer_tasklist, cpu);
- +
- + /* check to see if we're already queued */
- + if (!tsk->posix_timer_list && __fastpath_timer_check(tsk)) {
- + get_task_struct(tsk);
- + if (tasklist) {
- + tsk->posix_timer_list = tasklist;
- + } else {
- + /*
- + * The list is terminated by a self-pointing
- + * task_struct
- + */
- + tsk->posix_timer_list = tsk;
- + }
- + per_cpu(posix_timer_tasklist, cpu) = tsk;
- +
- + wake_up_process(per_cpu(posix_timer_task, cpu));
- + }
- +}
- +
- +/*
- + * posix_cpu_thread_call - callback that gets triggered when a CPU is added.
- + * Here we can start up the necessary migration thread for the new CPU.
- + */
- +static int posix_cpu_thread_call(struct notifier_block *nfb,
- + unsigned long action, void *hcpu)
- +{
- + int cpu = (long)hcpu;
- + struct task_struct *p;
- + struct sched_param param;
- +
- + switch (action) {
- + case CPU_UP_PREPARE:
- + p = kthread_create(posix_cpu_timers_thread, hcpu,
- + "posixcputmr/%d",cpu);
- + if (IS_ERR(p))
- + return NOTIFY_BAD;
- + p->flags |= PF_NOFREEZE;
- + kthread_bind(p, cpu);
- + /* Must be high prio to avoid getting starved */
- + param.sched_priority = MAX_RT_PRIO-1;
- + sched_setscheduler(p, SCHED_FIFO, ¶m);
- + per_cpu(posix_timer_task,cpu) = p;
- + break;
- + case CPU_ONLINE:
- + /* Strictly unneccessary, as first user will wake it. */
- + wake_up_process(per_cpu(posix_timer_task,cpu));
- + break;
- +#ifdef CONFIG_HOTPLUG_CPU
- + case CPU_UP_CANCELED:
- + /* Unbind it from offline cpu so it can run. Fall thru. */
- + kthread_bind(per_cpu(posix_timer_task, cpu),
- + cpumask_any(cpu_online_mask));
- + kthread_stop(per_cpu(posix_timer_task,cpu));
- + per_cpu(posix_timer_task,cpu) = NULL;
- + break;
- + case CPU_DEAD:
- + kthread_stop(per_cpu(posix_timer_task,cpu));
- + per_cpu(posix_timer_task,cpu) = NULL;
- + break;
- +#endif
- + }
- + return NOTIFY_OK;
- +}
- +
- +/* Register at highest priority so that task migration (migrate_all_tasks)
- + * happens before everything else.
- + */
- +static struct notifier_block posix_cpu_thread_notifier = {
- + .notifier_call = posix_cpu_thread_call,
- + .priority = 10
- +};
- +
- +static int __init posix_cpu_thread_init(void)
- +{
- + void *hcpu = (void *)(long)smp_processor_id();
- + /* Start one for boot CPU. */
- + unsigned long cpu;
- +
- + /* init the per-cpu posix_timer_tasklets */
- + for_each_possible_cpu(cpu)
- + per_cpu(posix_timer_tasklist, cpu) = NULL;
- +
- + posix_cpu_thread_call(&posix_cpu_thread_notifier, CPU_UP_PREPARE, hcpu);
- + posix_cpu_thread_call(&posix_cpu_thread_notifier, CPU_ONLINE, hcpu);
- + register_cpu_notifier(&posix_cpu_thread_notifier);
- + return 0;
- +}
- +early_initcall(posix_cpu_thread_init);
- +#else /* CONFIG_PREEMPT_RT_BASE */
- +void run_posix_cpu_timers(struct task_struct *tsk)
- +{
- + __run_posix_cpu_timers(tsk);
- +}
- +#endif /* CONFIG_PREEMPT_RT_BASE */
- +
- /*
- * Set one of the process-wide special case CPU timers or RLIMIT_CPU.
- * The tsk->sighand->siglock must be held by the caller.
- diff -Nur linux-4.1.39.orig/kernel/time/posix-timers.c linux-4.1.39/kernel/time/posix-timers.c
- --- linux-4.1.39.orig/kernel/time/posix-timers.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/time/posix-timers.c 2017-04-18 17:56:30.641398216 +0200
- @@ -499,6 +499,7 @@
- static struct pid *good_sigevent(sigevent_t * event)
- {
- struct task_struct *rtn = current->group_leader;
- + int sig = event->sigev_signo;
-
- if ((event->sigev_notify & SIGEV_THREAD_ID ) &&
- (!(rtn = find_task_by_vpid(event->sigev_notify_thread_id)) ||
- @@ -507,7 +508,8 @@
- return NULL;
-
- if (((event->sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE) &&
- - ((event->sigev_signo <= 0) || (event->sigev_signo > SIGRTMAX)))
- + (sig <= 0 || sig > SIGRTMAX || sig_kernel_only(sig) ||
- + sig_kernel_coredump(sig)))
- return NULL;
-
- return task_pid(rtn);
- @@ -819,6 +821,20 @@
- return overrun;
- }
-
- +/*
- + * Protected by RCU!
- + */
- +static void timer_wait_for_callback(struct k_clock *kc, struct k_itimer *timr)
- +{
- +#ifdef CONFIG_PREEMPT_RT_FULL
- + if (kc->timer_set == common_timer_set)
- + hrtimer_wait_for_timer(&timr->it.real.timer);
- + else
- + /* FIXME: Whacky hack for posix-cpu-timers */
- + schedule_timeout(1);
- +#endif
- +}
- +
- /* Set a POSIX.1b interval timer. */
- /* timr->it_lock is taken. */
- static int
- @@ -896,6 +912,7 @@
- if (!timr)
- return -EINVAL;
-
- + rcu_read_lock();
- kc = clockid_to_kclock(timr->it_clock);
- if (WARN_ON_ONCE(!kc || !kc->timer_set))
- error = -EINVAL;
- @@ -904,9 +921,12 @@
-
- unlock_timer(timr, flag);
- if (error == TIMER_RETRY) {
- + timer_wait_for_callback(kc, timr);
- rtn = NULL; // We already got the old time...
- + rcu_read_unlock();
- goto retry;
- }
- + rcu_read_unlock();
-
- if (old_setting && !error &&
- copy_to_user(old_setting, &old_spec, sizeof (old_spec)))
- @@ -944,10 +964,15 @@
- if (!timer)
- return -EINVAL;
-
- + rcu_read_lock();
- if (timer_delete_hook(timer) == TIMER_RETRY) {
- unlock_timer(timer, flags);
- + timer_wait_for_callback(clockid_to_kclock(timer->it_clock),
- + timer);
- + rcu_read_unlock();
- goto retry_delete;
- }
- + rcu_read_unlock();
-
- spin_lock(¤t->sighand->siglock);
- list_del(&timer->list);
- @@ -973,8 +998,18 @@
- retry_delete:
- spin_lock_irqsave(&timer->it_lock, flags);
-
- + /* On RT we can race with a deletion */
- + if (!timer->it_signal) {
- + unlock_timer(timer, flags);
- + return;
- + }
- +
- if (timer_delete_hook(timer) == TIMER_RETRY) {
- + rcu_read_lock();
- unlock_timer(timer, flags);
- + timer_wait_for_callback(clockid_to_kclock(timer->it_clock),
- + timer);
- + rcu_read_unlock();
- goto retry_delete;
- }
- list_del(&timer->list);
- diff -Nur linux-4.1.39.orig/kernel/time/tick-broadcast-hrtimer.c linux-4.1.39/kernel/time/tick-broadcast-hrtimer.c
- --- linux-4.1.39.orig/kernel/time/tick-broadcast-hrtimer.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/time/tick-broadcast-hrtimer.c 2017-04-18 17:56:30.641398216 +0200
- @@ -109,5 +109,6 @@
- {
- hrtimer_init(&bctimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
- bctimer.function = bc_handler;
- + bctimer.irqsafe = true;
- clockevents_register_device(&ce_broadcast_hrtimer);
- }
- diff -Nur linux-4.1.39.orig/kernel/time/tick-common.c linux-4.1.39/kernel/time/tick-common.c
- --- linux-4.1.39.orig/kernel/time/tick-common.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/time/tick-common.c 2017-04-18 17:56:30.641398216 +0200
- @@ -78,13 +78,15 @@
- static void tick_periodic(int cpu)
- {
- if (tick_do_timer_cpu == cpu) {
- - write_seqlock(&jiffies_lock);
- + raw_spin_lock(&jiffies_lock);
- + write_seqcount_begin(&jiffies_seq);
-
- /* Keep track of the next tick event */
- tick_next_period = ktime_add(tick_next_period, tick_period);
-
- do_timer(1);
- - write_sequnlock(&jiffies_lock);
- + write_seqcount_end(&jiffies_seq);
- + raw_spin_unlock(&jiffies_lock);
- update_wall_time();
- }
-
- @@ -146,9 +148,9 @@
- ktime_t next;
-
- do {
- - seq = read_seqbegin(&jiffies_lock);
- + seq = read_seqcount_begin(&jiffies_seq);
- next = tick_next_period;
- - } while (read_seqretry(&jiffies_lock, seq));
- + } while (read_seqcount_retry(&jiffies_seq, seq));
-
- clockevents_set_state(dev, CLOCK_EVT_STATE_ONESHOT);
-
- diff -Nur linux-4.1.39.orig/kernel/time/tick-sched.c linux-4.1.39/kernel/time/tick-sched.c
- --- linux-4.1.39.orig/kernel/time/tick-sched.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/time/tick-sched.c 2017-04-18 17:56:30.641398216 +0200
- @@ -62,7 +62,8 @@
- return;
-
- /* Reevalute with jiffies_lock held */
- - write_seqlock(&jiffies_lock);
- + raw_spin_lock(&jiffies_lock);
- + write_seqcount_begin(&jiffies_seq);
-
- delta = ktime_sub(now, last_jiffies_update);
- if (delta.tv64 >= tick_period.tv64) {
- @@ -85,10 +86,12 @@
- /* Keep the tick_next_period variable up to date */
- tick_next_period = ktime_add(last_jiffies_update, tick_period);
- } else {
- - write_sequnlock(&jiffies_lock);
- + write_seqcount_end(&jiffies_seq);
- + raw_spin_unlock(&jiffies_lock);
- return;
- }
- - write_sequnlock(&jiffies_lock);
- + write_seqcount_end(&jiffies_seq);
- + raw_spin_unlock(&jiffies_lock);
- update_wall_time();
- }
-
- @@ -99,12 +102,14 @@
- {
- ktime_t period;
-
- - write_seqlock(&jiffies_lock);
- + raw_spin_lock(&jiffies_lock);
- + write_seqcount_begin(&jiffies_seq);
- /* Did we start the jiffies update yet ? */
- if (last_jiffies_update.tv64 == 0)
- last_jiffies_update = tick_next_period;
- period = last_jiffies_update;
- - write_sequnlock(&jiffies_lock);
- + write_seqcount_end(&jiffies_seq);
- + raw_spin_unlock(&jiffies_lock);
- return period;
- }
-
- @@ -176,6 +181,11 @@
- return false;
- }
-
- + if (!arch_irq_work_has_interrupt()) {
- + trace_tick_stop(0, "missing irq work interrupt\n");
- + return false;
- + }
- +
- /* sched_clock_tick() needs us? */
- #ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
- /*
- @@ -222,6 +232,7 @@
-
- static DEFINE_PER_CPU(struct irq_work, nohz_full_kick_work) = {
- .func = nohz_full_kick_work_func,
- + .flags = IRQ_WORK_HARD_IRQ,
- };
-
- /*
- @@ -578,10 +589,10 @@
-
- /* Read jiffies and the time when jiffies were updated last */
- do {
- - seq = read_seqbegin(&jiffies_lock);
- + seq = read_seqcount_begin(&jiffies_seq);
- last_update = last_jiffies_update;
- last_jiffies = jiffies;
- - } while (read_seqretry(&jiffies_lock, seq));
- + } while (read_seqcount_retry(&jiffies_seq, seq));
-
- if (rcu_needs_cpu(&rcu_delta_jiffies) ||
- arch_needs_cpu() || irq_work_needs_cpu()) {
- @@ -759,14 +770,7 @@
- return false;
-
- if (unlikely(local_softirq_pending() && cpu_online(cpu))) {
- - static int ratelimit;
- -
- - if (ratelimit < 10 &&
- - (local_softirq_pending() & SOFTIRQ_STOP_IDLE_MASK)) {
- - pr_warn("NOHZ: local_softirq_pending %02x\n",
- - (unsigned int) local_softirq_pending());
- - ratelimit++;
- - }
- + softirq_check_pending_idle();
- return false;
- }
-
- @@ -1154,6 +1158,7 @@
- * Emulate tick processing via per-CPU hrtimers:
- */
- hrtimer_init(&ts->sched_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
- + ts->sched_timer.irqsafe = 1;
- ts->sched_timer.function = tick_sched_timer;
-
- /* Get the next period (per cpu) */
- diff -Nur linux-4.1.39.orig/kernel/time/timekeeping.c linux-4.1.39/kernel/time/timekeeping.c
- --- linux-4.1.39.orig/kernel/time/timekeeping.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/time/timekeeping.c 2017-04-18 17:56:30.641398216 +0200
- @@ -2087,8 +2087,10 @@
- */
- void xtime_update(unsigned long ticks)
- {
- - write_seqlock(&jiffies_lock);
- + raw_spin_lock(&jiffies_lock);
- + write_seqcount_begin(&jiffies_seq);
- do_timer(ticks);
- - write_sequnlock(&jiffies_lock);
- + write_seqcount_end(&jiffies_seq);
- + raw_spin_unlock(&jiffies_lock);
- update_wall_time();
- }
- diff -Nur linux-4.1.39.orig/kernel/time/timekeeping.h linux-4.1.39/kernel/time/timekeeping.h
- --- linux-4.1.39.orig/kernel/time/timekeeping.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/time/timekeeping.h 2017-04-18 17:56:30.641398216 +0200
- @@ -22,7 +22,8 @@
- extern void do_timer(unsigned long ticks);
- extern void update_wall_time(void);
-
- -extern seqlock_t jiffies_lock;
- +extern raw_spinlock_t jiffies_lock;
- +extern seqcount_t jiffies_seq;
-
- #define CS_NAME_LEN 32
-
- diff -Nur linux-4.1.39.orig/kernel/time/timer.c linux-4.1.39/kernel/time/timer.c
- --- linux-4.1.39.orig/kernel/time/timer.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/time/timer.c 2017-04-18 17:56:30.641398216 +0200
- @@ -78,6 +78,9 @@
- struct tvec_base {
- spinlock_t lock;
- struct timer_list *running_timer;
- +#ifdef CONFIG_PREEMPT_RT_FULL
- + wait_queue_head_t wait_for_running_timer;
- +#endif
- unsigned long timer_jiffies;
- unsigned long next_timer;
- unsigned long active_timers;
- @@ -768,6 +771,36 @@
- }
- }
-
- +#ifndef CONFIG_PREEMPT_RT_FULL
- +static inline struct tvec_base *switch_timer_base(struct timer_list *timer,
- + struct tvec_base *old,
- + struct tvec_base *new)
- +{
- + /* See the comment in lock_timer_base() */
- + timer_set_base(timer, NULL);
- + spin_unlock(&old->lock);
- + spin_lock(&new->lock);
- + timer_set_base(timer, new);
- + return new;
- +}
- +#else
- +static inline struct tvec_base *switch_timer_base(struct timer_list *timer,
- + struct tvec_base *old,
- + struct tvec_base *new)
- +{
- + /*
- + * We cannot do the above because we might be preempted and
- + * then the preempter would see NULL and loop forever.
- + */
- + if (spin_trylock(&new->lock)) {
- + timer_set_base(timer, new);
- + spin_unlock(&old->lock);
- + return new;
- + }
- + return old;
- +}
- +#endif
- +
- static inline int
- __mod_timer(struct timer_list *timer, unsigned long expires,
- bool pending_only, int pinned)
- @@ -798,14 +831,8 @@
- * handler yet has not finished. This also guarantees that
- * the timer is serialized wrt itself.
- */
- - if (likely(base->running_timer != timer)) {
- - /* See the comment in lock_timer_base() */
- - timer_set_base(timer, NULL);
- - spin_unlock(&base->lock);
- - base = new_base;
- - spin_lock(&base->lock);
- - timer_set_base(timer, base);
- - }
- + if (likely(base->running_timer != timer))
- + base = switch_timer_base(timer, base, new_base);
- }
-
- timer->expires = expires;
- @@ -979,6 +1006,29 @@
- }
- EXPORT_SYMBOL_GPL(add_timer_on);
-
- +#ifdef CONFIG_PREEMPT_RT_FULL
- +/*
- + * Wait for a running timer
- + */
- +static void wait_for_running_timer(struct timer_list *timer)
- +{
- + struct tvec_base *base = timer->base;
- +
- + if (base->running_timer == timer)
- + wait_event(base->wait_for_running_timer,
- + base->running_timer != timer);
- +}
- +
- +# define wakeup_timer_waiters(b) wake_up_all(&(b)->wait_for_running_timer)
- +#else
- +static inline void wait_for_running_timer(struct timer_list *timer)
- +{
- + cpu_relax();
- +}
- +
- +# define wakeup_timer_waiters(b) do { } while (0)
- +#endif
- +
- /**
- * del_timer - deactive a timer.
- * @timer: the timer to be deactivated
- @@ -1036,7 +1086,7 @@
- }
- EXPORT_SYMBOL(try_to_del_timer_sync);
-
- -#ifdef CONFIG_SMP
- +#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_RT_FULL)
- static DEFINE_PER_CPU(struct tvec_base, __tvec_bases);
-
- /**
- @@ -1098,7 +1148,7 @@
- int ret = try_to_del_timer_sync(timer);
- if (ret >= 0)
- return ret;
- - cpu_relax();
- + wait_for_running_timer(timer);
- }
- }
- EXPORT_SYMBOL(del_timer_sync);
- @@ -1219,16 +1269,18 @@
- if (irqsafe) {
- spin_unlock(&base->lock);
- call_timer_fn(timer, fn, data);
- + base->running_timer = NULL;
- spin_lock(&base->lock);
- } else {
- spin_unlock_irq(&base->lock);
- call_timer_fn(timer, fn, data);
- + base->running_timer = NULL;
- spin_lock_irq(&base->lock);
- }
- }
- }
- - base->running_timer = NULL;
- spin_unlock_irq(&base->lock);
- + wakeup_timer_waiters(base);
- }
-
- #ifdef CONFIG_NO_HZ_COMMON
- @@ -1367,6 +1419,14 @@
- if (cpu_is_offline(smp_processor_id()))
- return expires;
-
- +#ifdef CONFIG_PREEMPT_RT_FULL
- + /*
- + * On PREEMPT_RT we cannot sleep here. As a result we can't take
- + * the base lock to check when the next timer is pending and so
- + * we assume the next jiffy.
- + */
- + return now + 1;
- +#endif
- spin_lock(&base->lock);
- if (base->active_timers) {
- if (time_before_eq(base->next_timer, base->timer_jiffies))
- @@ -1392,13 +1452,13 @@
-
- /* Note: this timer irq context must be accounted for as well. */
- account_process_tick(p, user_tick);
- + scheduler_tick();
- run_local_timers();
- rcu_check_callbacks(user_tick);
- -#ifdef CONFIG_IRQ_WORK
- +#if defined(CONFIG_IRQ_WORK)
- if (in_irq())
- irq_work_tick();
- #endif
- - scheduler_tick();
- run_posix_cpu_timers(p);
- }
-
- @@ -1411,6 +1471,8 @@
-
- hrtimer_run_pending();
-
- + irq_work_tick_soft();
- +
- if (time_after_eq(jiffies, base->timer_jiffies))
- __run_timers(base);
- }
- @@ -1566,7 +1628,7 @@
-
- BUG_ON(cpu_online(cpu));
- old_base = per_cpu(tvec_bases, cpu);
- - new_base = get_cpu_var(tvec_bases);
- + new_base = get_local_var(tvec_bases);
- /*
- * The caller is globally serialized and nobody else
- * takes two locks at once, deadlock is not possible.
- @@ -1590,7 +1652,7 @@
-
- spin_unlock(&old_base->lock);
- spin_unlock_irq(&new_base->lock);
- - put_cpu_var(tvec_bases);
- + put_local_var(tvec_bases);
- }
-
- static int timer_cpu_notify(struct notifier_block *self,
- @@ -1625,6 +1687,9 @@
- base->cpu = cpu;
- per_cpu(tvec_bases, cpu) = base;
- spin_lock_init(&base->lock);
- +#ifdef CONFIG_PREEMPT_RT_FULL
- + init_waitqueue_head(&base->wait_for_running_timer);
- +#endif
-
- for (j = 0; j < TVN_SIZE; j++) {
- INIT_LIST_HEAD(base->tv5.vec + j);
- diff -Nur linux-4.1.39.orig/kernel/trace/Kconfig linux-4.1.39/kernel/trace/Kconfig
- --- linux-4.1.39.orig/kernel/trace/Kconfig 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/trace/Kconfig 2017-04-18 17:56:30.641398216 +0200
- @@ -187,6 +187,24 @@
- enabled. This option and the preempt-off timing option can be
- used together or separately.)
-
- +config INTERRUPT_OFF_HIST
- + bool "Interrupts-off Latency Histogram"
- + depends on IRQSOFF_TRACER
- + help
- + This option generates continuously updated histograms (one per cpu)
- + of the duration of time periods with interrupts disabled. The
- + histograms are disabled by default. To enable them, write a non-zero
- + number to
- +
- + /sys/kernel/debug/tracing/latency_hist/enable/preemptirqsoff
- +
- + If PREEMPT_OFF_HIST is also selected, additional histograms (one
- + per cpu) are generated that accumulate the duration of time periods
- + when both interrupts and preemption are disabled. The histogram data
- + will be located in the debug file system at
- +
- + /sys/kernel/debug/tracing/latency_hist/irqsoff
- +
- config PREEMPT_TRACER
- bool "Preemption-off Latency Tracer"
- default n
- @@ -211,6 +229,24 @@
- enabled. This option and the irqs-off timing option can be
- used together or separately.)
-
- +config PREEMPT_OFF_HIST
- + bool "Preemption-off Latency Histogram"
- + depends on PREEMPT_TRACER
- + help
- + This option generates continuously updated histograms (one per cpu)
- + of the duration of time periods with preemption disabled. The
- + histograms are disabled by default. To enable them, write a non-zero
- + number to
- +
- + /sys/kernel/debug/tracing/latency_hist/enable/preemptirqsoff
- +
- + If INTERRUPT_OFF_HIST is also selected, additional histograms (one
- + per cpu) are generated that accumulate the duration of time periods
- + when both interrupts and preemption are disabled. The histogram data
- + will be located in the debug file system at
- +
- + /sys/kernel/debug/tracing/latency_hist/preemptoff
- +
- config SCHED_TRACER
- bool "Scheduling Latency Tracer"
- select GENERIC_TRACER
- @@ -221,6 +257,74 @@
- This tracer tracks the latency of the highest priority task
- to be scheduled in, starting from the point it has woken up.
-
- +config WAKEUP_LATENCY_HIST
- + bool "Scheduling Latency Histogram"
- + depends on SCHED_TRACER
- + help
- + This option generates continuously updated histograms (one per cpu)
- + of the scheduling latency of the highest priority task.
- + The histograms are disabled by default. To enable them, write a
- + non-zero number to
- +
- + /sys/kernel/debug/tracing/latency_hist/enable/wakeup
- +
- + Two different algorithms are used, one to determine the latency of
- + processes that exclusively use the highest priority of the system and
- + another one to determine the latency of processes that share the
- + highest system priority with other processes. The former is used to
- + improve hardware and system software, the latter to optimize the
- + priority design of a given system. The histogram data will be
- + located in the debug file system at
- +
- + /sys/kernel/debug/tracing/latency_hist/wakeup
- +
- + and
- +
- + /sys/kernel/debug/tracing/latency_hist/wakeup/sharedprio
- +
- + If both Scheduling Latency Histogram and Missed Timer Offsets
- + Histogram are selected, additional histogram data will be collected
- + that contain, in addition to the wakeup latency, the timer latency, in
- + case the wakeup was triggered by an expired timer. These histograms
- + are available in the
- +
- + /sys/kernel/debug/tracing/latency_hist/timerandwakeup
- +
- + directory. They reflect the apparent interrupt and scheduling latency
- + and are best suitable to determine the worst-case latency of a given
- + system. To enable these histograms, write a non-zero number to
- +
- + /sys/kernel/debug/tracing/latency_hist/enable/timerandwakeup
- +
- +config MISSED_TIMER_OFFSETS_HIST
- + depends on HIGH_RES_TIMERS
- + select GENERIC_TRACER
- + bool "Missed Timer Offsets Histogram"
- + help
- + Generate a histogram of missed timer offsets in microseconds. The
- + histograms are disabled by default. To enable them, write a non-zero
- + number to
- +
- + /sys/kernel/debug/tracing/latency_hist/enable/missed_timer_offsets
- +
- + The histogram data will be located in the debug file system at
- +
- + /sys/kernel/debug/tracing/latency_hist/missed_timer_offsets
- +
- + If both Scheduling Latency Histogram and Missed Timer Offsets
- + Histogram are selected, additional histogram data will be collected
- + that contain, in addition to the wakeup latency, the timer latency, in
- + case the wakeup was triggered by an expired timer. These histograms
- + are available in the
- +
- + /sys/kernel/debug/tracing/latency_hist/timerandwakeup
- +
- + directory. They reflect the apparent interrupt and scheduling latency
- + and are best suitable to determine the worst-case latency of a given
- + system. To enable these histograms, write a non-zero number to
- +
- + /sys/kernel/debug/tracing/latency_hist/enable/timerandwakeup
- +
- config ENABLE_DEFAULT_TRACERS
- bool "Trace process context switches and events"
- depends on !GENERIC_TRACER
- diff -Nur linux-4.1.39.orig/kernel/trace/latency_hist.c linux-4.1.39/kernel/trace/latency_hist.c
- --- linux-4.1.39.orig/kernel/trace/latency_hist.c 1970-01-01 01:00:00.000000000 +0100
- +++ linux-4.1.39/kernel/trace/latency_hist.c 2017-04-18 17:56:30.641398216 +0200
- @@ -0,0 +1,1178 @@
- +/*
- + * kernel/trace/latency_hist.c
- + *
- + * Add support for histograms of preemption-off latency and
- + * interrupt-off latency and wakeup latency, it depends on
- + * Real-Time Preemption Support.
- + *
- + * Copyright (C) 2005 MontaVista Software, Inc.
- + * Yi Yang <yyang@ch.mvista.com>
- + *
- + * Converted to work with the new latency tracer.
- + * Copyright (C) 2008 Red Hat, Inc.
- + * Steven Rostedt <srostedt@redhat.com>
- + *
- + */
- +#include <linux/module.h>
- +#include <linux/debugfs.h>
- +#include <linux/seq_file.h>
- +#include <linux/percpu.h>
- +#include <linux/kallsyms.h>
- +#include <linux/uaccess.h>
- +#include <linux/sched.h>
- +#include <linux/sched/rt.h>
- +#include <linux/slab.h>
- +#include <linux/atomic.h>
- +#include <asm/div64.h>
- +
- +#include "trace.h"
- +#include <trace/events/sched.h>
- +
- +#define NSECS_PER_USECS 1000L
- +
- +#define CREATE_TRACE_POINTS
- +#include <trace/events/hist.h>
- +
- +enum {
- + IRQSOFF_LATENCY = 0,
- + PREEMPTOFF_LATENCY,
- + PREEMPTIRQSOFF_LATENCY,
- + WAKEUP_LATENCY,
- + WAKEUP_LATENCY_SHAREDPRIO,
- + MISSED_TIMER_OFFSETS,
- + TIMERANDWAKEUP_LATENCY,
- + MAX_LATENCY_TYPE,
- +};
- +
- +#define MAX_ENTRY_NUM 10240
- +
- +struct hist_data {
- + atomic_t hist_mode; /* 0 log, 1 don't log */
- + long offset; /* set it to MAX_ENTRY_NUM/2 for a bipolar scale */
- + long min_lat;
- + long max_lat;
- + unsigned long long below_hist_bound_samples;
- + unsigned long long above_hist_bound_samples;
- + long long accumulate_lat;
- + unsigned long long total_samples;
- + unsigned long long hist_array[MAX_ENTRY_NUM];
- +};
- +
- +struct enable_data {
- + int latency_type;
- + int enabled;
- +};
- +
- +static char *latency_hist_dir_root = "latency_hist";
- +
- +#ifdef CONFIG_INTERRUPT_OFF_HIST
- +static DEFINE_PER_CPU(struct hist_data, irqsoff_hist);
- +static char *irqsoff_hist_dir = "irqsoff";
- +static DEFINE_PER_CPU(cycles_t, hist_irqsoff_start);
- +static DEFINE_PER_CPU(int, hist_irqsoff_counting);
- +#endif
- +
- +#ifdef CONFIG_PREEMPT_OFF_HIST
- +static DEFINE_PER_CPU(struct hist_data, preemptoff_hist);
- +static char *preemptoff_hist_dir = "preemptoff";
- +static DEFINE_PER_CPU(cycles_t, hist_preemptoff_start);
- +static DEFINE_PER_CPU(int, hist_preemptoff_counting);
- +#endif
- +
- +#if defined(CONFIG_PREEMPT_OFF_HIST) && defined(CONFIG_INTERRUPT_OFF_HIST)
- +static DEFINE_PER_CPU(struct hist_data, preemptirqsoff_hist);
- +static char *preemptirqsoff_hist_dir = "preemptirqsoff";
- +static DEFINE_PER_CPU(cycles_t, hist_preemptirqsoff_start);
- +static DEFINE_PER_CPU(int, hist_preemptirqsoff_counting);
- +#endif
- +
- +#if defined(CONFIG_PREEMPT_OFF_HIST) || defined(CONFIG_INTERRUPT_OFF_HIST)
- +static notrace void probe_preemptirqsoff_hist(void *v, int reason, int start);
- +static struct enable_data preemptirqsoff_enabled_data = {
- + .latency_type = PREEMPTIRQSOFF_LATENCY,
- + .enabled = 0,
- +};
- +#endif
- +
- +#if defined(CONFIG_WAKEUP_LATENCY_HIST) || \
- + defined(CONFIG_MISSED_TIMER_OFFSETS_HIST)
- +struct maxlatproc_data {
- + char comm[FIELD_SIZEOF(struct task_struct, comm)];
- + char current_comm[FIELD_SIZEOF(struct task_struct, comm)];
- + int pid;
- + int current_pid;
- + int prio;
- + int current_prio;
- + long latency;
- + long timeroffset;
- + cycle_t timestamp;
- +};
- +#endif
- +
- +#ifdef CONFIG_WAKEUP_LATENCY_HIST
- +static DEFINE_PER_CPU(struct hist_data, wakeup_latency_hist);
- +static DEFINE_PER_CPU(struct hist_data, wakeup_latency_hist_sharedprio);
- +static char *wakeup_latency_hist_dir = "wakeup";
- +static char *wakeup_latency_hist_dir_sharedprio = "sharedprio";
- +static notrace void probe_wakeup_latency_hist_start(void *v,
- + struct task_struct *p);
- +static notrace void probe_wakeup_latency_hist_stop(void *v,
- + struct task_struct *prev, struct task_struct *next);
- +static notrace void probe_sched_migrate_task(void *,
- + struct task_struct *task, int cpu);
- +static struct enable_data wakeup_latency_enabled_data = {
- + .latency_type = WAKEUP_LATENCY,
- + .enabled = 0,
- +};
- +static DEFINE_PER_CPU(struct maxlatproc_data, wakeup_maxlatproc);
- +static DEFINE_PER_CPU(struct maxlatproc_data, wakeup_maxlatproc_sharedprio);
- +static DEFINE_PER_CPU(struct task_struct *, wakeup_task);
- +static DEFINE_PER_CPU(int, wakeup_sharedprio);
- +static unsigned long wakeup_pid;
- +#endif
- +
- +#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST
- +static DEFINE_PER_CPU(struct hist_data, missed_timer_offsets);
- +static char *missed_timer_offsets_dir = "missed_timer_offsets";
- +static notrace void probe_hrtimer_interrupt(void *v, int cpu,
- + long long offset, struct task_struct *curr, struct task_struct *task);
- +static struct enable_data missed_timer_offsets_enabled_data = {
- + .latency_type = MISSED_TIMER_OFFSETS,
- + .enabled = 0,
- +};
- +static DEFINE_PER_CPU(struct maxlatproc_data, missed_timer_offsets_maxlatproc);
- +static unsigned long missed_timer_offsets_pid;
- +#endif
- +
- +#if defined(CONFIG_WAKEUP_LATENCY_HIST) && \
- + defined(CONFIG_MISSED_TIMER_OFFSETS_HIST)
- +static DEFINE_PER_CPU(struct hist_data, timerandwakeup_latency_hist);
- +static char *timerandwakeup_latency_hist_dir = "timerandwakeup";
- +static struct enable_data timerandwakeup_enabled_data = {
- + .latency_type = TIMERANDWAKEUP_LATENCY,
- + .enabled = 0,
- +};
- +static DEFINE_PER_CPU(struct maxlatproc_data, timerandwakeup_maxlatproc);
- +#endif
- +
- +void notrace latency_hist(int latency_type, int cpu, long latency,
- + long timeroffset, cycle_t stop,
- + struct task_struct *p)
- +{
- + struct hist_data *my_hist;
- +#if defined(CONFIG_WAKEUP_LATENCY_HIST) || \
- + defined(CONFIG_MISSED_TIMER_OFFSETS_HIST)
- + struct maxlatproc_data *mp = NULL;
- +#endif
- +
- + if (!cpu_possible(cpu) || latency_type < 0 ||
- + latency_type >= MAX_LATENCY_TYPE)
- + return;
- +
- + switch (latency_type) {
- +#ifdef CONFIG_INTERRUPT_OFF_HIST
- + case IRQSOFF_LATENCY:
- + my_hist = &per_cpu(irqsoff_hist, cpu);
- + break;
- +#endif
- +#ifdef CONFIG_PREEMPT_OFF_HIST
- + case PREEMPTOFF_LATENCY:
- + my_hist = &per_cpu(preemptoff_hist, cpu);
- + break;
- +#endif
- +#if defined(CONFIG_PREEMPT_OFF_HIST) && defined(CONFIG_INTERRUPT_OFF_HIST)
- + case PREEMPTIRQSOFF_LATENCY:
- + my_hist = &per_cpu(preemptirqsoff_hist, cpu);
- + break;
- +#endif
- +#ifdef CONFIG_WAKEUP_LATENCY_HIST
- + case WAKEUP_LATENCY:
- + my_hist = &per_cpu(wakeup_latency_hist, cpu);
- + mp = &per_cpu(wakeup_maxlatproc, cpu);
- + break;
- + case WAKEUP_LATENCY_SHAREDPRIO:
- + my_hist = &per_cpu(wakeup_latency_hist_sharedprio, cpu);
- + mp = &per_cpu(wakeup_maxlatproc_sharedprio, cpu);
- + break;
- +#endif
- +#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST
- + case MISSED_TIMER_OFFSETS:
- + my_hist = &per_cpu(missed_timer_offsets, cpu);
- + mp = &per_cpu(missed_timer_offsets_maxlatproc, cpu);
- + break;
- +#endif
- +#if defined(CONFIG_WAKEUP_LATENCY_HIST) && \
- + defined(CONFIG_MISSED_TIMER_OFFSETS_HIST)
- + case TIMERANDWAKEUP_LATENCY:
- + my_hist = &per_cpu(timerandwakeup_latency_hist, cpu);
- + mp = &per_cpu(timerandwakeup_maxlatproc, cpu);
- + break;
- +#endif
- +
- + default:
- + return;
- + }
- +
- + latency += my_hist->offset;
- +
- + if (atomic_read(&my_hist->hist_mode) == 0)
- + return;
- +
- + if (latency < 0 || latency >= MAX_ENTRY_NUM) {
- + if (latency < 0)
- + my_hist->below_hist_bound_samples++;
- + else
- + my_hist->above_hist_bound_samples++;
- + } else
- + my_hist->hist_array[latency]++;
- +
- + if (unlikely(latency > my_hist->max_lat ||
- + my_hist->min_lat == LONG_MAX)) {
- +#if defined(CONFIG_WAKEUP_LATENCY_HIST) || \
- + defined(CONFIG_MISSED_TIMER_OFFSETS_HIST)
- + if (latency_type == WAKEUP_LATENCY ||
- + latency_type == WAKEUP_LATENCY_SHAREDPRIO ||
- + latency_type == MISSED_TIMER_OFFSETS ||
- + latency_type == TIMERANDWAKEUP_LATENCY) {
- + strncpy(mp->comm, p->comm, sizeof(mp->comm));
- + strncpy(mp->current_comm, current->comm,
- + sizeof(mp->current_comm));
- + mp->pid = task_pid_nr(p);
- + mp->current_pid = task_pid_nr(current);
- + mp->prio = p->prio;
- + mp->current_prio = current->prio;
- + mp->latency = latency;
- + mp->timeroffset = timeroffset;
- + mp->timestamp = stop;
- + }
- +#endif
- + my_hist->max_lat = latency;
- + }
- + if (unlikely(latency < my_hist->min_lat))
- + my_hist->min_lat = latency;
- + my_hist->total_samples++;
- + my_hist->accumulate_lat += latency;
- +}
- +
- +static void *l_start(struct seq_file *m, loff_t *pos)
- +{
- + loff_t *index_ptr = NULL;
- + loff_t index = *pos;
- + struct hist_data *my_hist = m->private;
- +
- + if (index == 0) {
- + char minstr[32], avgstr[32], maxstr[32];
- +
- + atomic_dec(&my_hist->hist_mode);
- +
- + if (likely(my_hist->total_samples)) {
- + long avg = (long) div64_s64(my_hist->accumulate_lat,
- + my_hist->total_samples);
- + snprintf(minstr, sizeof(minstr), "%ld",
- + my_hist->min_lat - my_hist->offset);
- + snprintf(avgstr, sizeof(avgstr), "%ld",
- + avg - my_hist->offset);
- + snprintf(maxstr, sizeof(maxstr), "%ld",
- + my_hist->max_lat - my_hist->offset);
- + } else {
- + strcpy(minstr, "<undef>");
- + strcpy(avgstr, minstr);
- + strcpy(maxstr, minstr);
- + }
- +
- + seq_printf(m, "#Minimum latency: %s microseconds\n"
- + "#Average latency: %s microseconds\n"
- + "#Maximum latency: %s microseconds\n"
- + "#Total samples: %llu\n"
- + "#There are %llu samples lower than %ld"
- + " microseconds.\n"
- + "#There are %llu samples greater or equal"
- + " than %ld microseconds.\n"
- + "#usecs\t%16s\n",
- + minstr, avgstr, maxstr,
- + my_hist->total_samples,
- + my_hist->below_hist_bound_samples,
- + -my_hist->offset,
- + my_hist->above_hist_bound_samples,
- + MAX_ENTRY_NUM - my_hist->offset,
- + "samples");
- + }
- + if (index < MAX_ENTRY_NUM) {
- + index_ptr = kmalloc(sizeof(loff_t), GFP_KERNEL);
- + if (index_ptr)
- + *index_ptr = index;
- + }
- +
- + return index_ptr;
- +}
- +
- +static void *l_next(struct seq_file *m, void *p, loff_t *pos)
- +{
- + loff_t *index_ptr = p;
- + struct hist_data *my_hist = m->private;
- +
- + if (++*pos >= MAX_ENTRY_NUM) {
- + atomic_inc(&my_hist->hist_mode);
- + return NULL;
- + }
- + *index_ptr = *pos;
- + return index_ptr;
- +}
- +
- +static void l_stop(struct seq_file *m, void *p)
- +{
- + kfree(p);
- +}
- +
- +static int l_show(struct seq_file *m, void *p)
- +{
- + int index = *(loff_t *) p;
- + struct hist_data *my_hist = m->private;
- +
- + seq_printf(m, "%6ld\t%16llu\n", index - my_hist->offset,
- + my_hist->hist_array[index]);
- + return 0;
- +}
- +
- +static const struct seq_operations latency_hist_seq_op = {
- + .start = l_start,
- + .next = l_next,
- + .stop = l_stop,
- + .show = l_show
- +};
- +
- +static int latency_hist_open(struct inode *inode, struct file *file)
- +{
- + int ret;
- +
- + ret = seq_open(file, &latency_hist_seq_op);
- + if (!ret) {
- + struct seq_file *seq = file->private_data;
- + seq->private = inode->i_private;
- + }
- + return ret;
- +}
- +
- +static const struct file_operations latency_hist_fops = {
- + .open = latency_hist_open,
- + .read = seq_read,
- + .llseek = seq_lseek,
- + .release = seq_release,
- +};
- +
- +#if defined(CONFIG_WAKEUP_LATENCY_HIST) || \
- + defined(CONFIG_MISSED_TIMER_OFFSETS_HIST)
- +static void clear_maxlatprocdata(struct maxlatproc_data *mp)
- +{
- + mp->comm[0] = mp->current_comm[0] = '\0';
- + mp->prio = mp->current_prio = mp->pid = mp->current_pid =
- + mp->latency = mp->timeroffset = -1;
- + mp->timestamp = 0;
- +}
- +#endif
- +
- +static void hist_reset(struct hist_data *hist)
- +{
- + atomic_dec(&hist->hist_mode);
- +
- + memset(hist->hist_array, 0, sizeof(hist->hist_array));
- + hist->below_hist_bound_samples = 0ULL;
- + hist->above_hist_bound_samples = 0ULL;
- + hist->min_lat = LONG_MAX;
- + hist->max_lat = LONG_MIN;
- + hist->total_samples = 0ULL;
- + hist->accumulate_lat = 0LL;
- +
- + atomic_inc(&hist->hist_mode);
- +}
- +
- +static ssize_t
- +latency_hist_reset(struct file *file, const char __user *a,
- + size_t size, loff_t *off)
- +{
- + int cpu;
- + struct hist_data *hist = NULL;
- +#if defined(CONFIG_WAKEUP_LATENCY_HIST) || \
- + defined(CONFIG_MISSED_TIMER_OFFSETS_HIST)
- + struct maxlatproc_data *mp = NULL;
- +#endif
- + off_t latency_type = (off_t) file->private_data;
- +
- + for_each_online_cpu(cpu) {
- +
- + switch (latency_type) {
- +#ifdef CONFIG_PREEMPT_OFF_HIST
- + case PREEMPTOFF_LATENCY:
- + hist = &per_cpu(preemptoff_hist, cpu);
- + break;
- +#endif
- +#ifdef CONFIG_INTERRUPT_OFF_HIST
- + case IRQSOFF_LATENCY:
- + hist = &per_cpu(irqsoff_hist, cpu);
- + break;
- +#endif
- +#if defined(CONFIG_INTERRUPT_OFF_HIST) && defined(CONFIG_PREEMPT_OFF_HIST)
- + case PREEMPTIRQSOFF_LATENCY:
- + hist = &per_cpu(preemptirqsoff_hist, cpu);
- + break;
- +#endif
- +#ifdef CONFIG_WAKEUP_LATENCY_HIST
- + case WAKEUP_LATENCY:
- + hist = &per_cpu(wakeup_latency_hist, cpu);
- + mp = &per_cpu(wakeup_maxlatproc, cpu);
- + break;
- + case WAKEUP_LATENCY_SHAREDPRIO:
- + hist = &per_cpu(wakeup_latency_hist_sharedprio, cpu);
- + mp = &per_cpu(wakeup_maxlatproc_sharedprio, cpu);
- + break;
- +#endif
- +#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST
- + case MISSED_TIMER_OFFSETS:
- + hist = &per_cpu(missed_timer_offsets, cpu);
- + mp = &per_cpu(missed_timer_offsets_maxlatproc, cpu);
- + break;
- +#endif
- +#if defined(CONFIG_WAKEUP_LATENCY_HIST) && \
- + defined(CONFIG_MISSED_TIMER_OFFSETS_HIST)
- + case TIMERANDWAKEUP_LATENCY:
- + hist = &per_cpu(timerandwakeup_latency_hist, cpu);
- + mp = &per_cpu(timerandwakeup_maxlatproc, cpu);
- + break;
- +#endif
- + }
- +
- + hist_reset(hist);
- +#if defined(CONFIG_WAKEUP_LATENCY_HIST) || \
- + defined(CONFIG_MISSED_TIMER_OFFSETS_HIST)
- + if (latency_type == WAKEUP_LATENCY ||
- + latency_type == WAKEUP_LATENCY_SHAREDPRIO ||
- + latency_type == MISSED_TIMER_OFFSETS ||
- + latency_type == TIMERANDWAKEUP_LATENCY)
- + clear_maxlatprocdata(mp);
- +#endif
- + }
- +
- + return size;
- +}
- +
- +#if defined(CONFIG_WAKEUP_LATENCY_HIST) || \
- + defined(CONFIG_MISSED_TIMER_OFFSETS_HIST)
- +static ssize_t
- +show_pid(struct file *file, char __user *ubuf, size_t cnt, loff_t *ppos)
- +{
- + char buf[64];
- + int r;
- + unsigned long *this_pid = file->private_data;
- +
- + r = snprintf(buf, sizeof(buf), "%lu\n", *this_pid);
- + return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
- +}
- +
- +static ssize_t do_pid(struct file *file, const char __user *ubuf,
- + size_t cnt, loff_t *ppos)
- +{
- + char buf[64];
- + unsigned long pid;
- + unsigned long *this_pid = file->private_data;
- +
- + if (cnt >= sizeof(buf))
- + return -EINVAL;
- +
- + if (copy_from_user(&buf, ubuf, cnt))
- + return -EFAULT;
- +
- + buf[cnt] = '\0';
- +
- + if (kstrtoul(buf, 10, &pid))
- + return -EINVAL;
- +
- + *this_pid = pid;
- +
- + return cnt;
- +}
- +#endif
- +
- +#if defined(CONFIG_WAKEUP_LATENCY_HIST) || \
- + defined(CONFIG_MISSED_TIMER_OFFSETS_HIST)
- +static ssize_t
- +show_maxlatproc(struct file *file, char __user *ubuf, size_t cnt, loff_t *ppos)
- +{
- + int r;
- + struct maxlatproc_data *mp = file->private_data;
- + int strmaxlen = (TASK_COMM_LEN * 2) + (8 * 8);
- + unsigned long long t;
- + unsigned long usecs, secs;
- + char *buf;
- +
- + if (mp->pid == -1 || mp->current_pid == -1) {
- + buf = "(none)\n";
- + return simple_read_from_buffer(ubuf, cnt, ppos, buf,
- + strlen(buf));
- + }
- +
- + buf = kmalloc(strmaxlen, GFP_KERNEL);
- + if (buf == NULL)
- + return -ENOMEM;
- +
- + t = ns2usecs(mp->timestamp);
- + usecs = do_div(t, USEC_PER_SEC);
- + secs = (unsigned long) t;
- + r = snprintf(buf, strmaxlen,
- + "%d %d %ld (%ld) %s <- %d %d %s %lu.%06lu\n", mp->pid,
- + MAX_RT_PRIO-1 - mp->prio, mp->latency, mp->timeroffset, mp->comm,
- + mp->current_pid, MAX_RT_PRIO-1 - mp->current_prio, mp->current_comm,
- + secs, usecs);
- + r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
- + kfree(buf);
- + return r;
- +}
- +#endif
- +
- +static ssize_t
- +show_enable(struct file *file, char __user *ubuf, size_t cnt, loff_t *ppos)
- +{
- + char buf[64];
- + struct enable_data *ed = file->private_data;
- + int r;
- +
- + r = snprintf(buf, sizeof(buf), "%d\n", ed->enabled);
- + return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
- +}
- +
- +static ssize_t
- +do_enable(struct file *file, const char __user *ubuf, size_t cnt, loff_t *ppos)
- +{
- + char buf[64];
- + long enable;
- + struct enable_data *ed = file->private_data;
- +
- + if (cnt >= sizeof(buf))
- + return -EINVAL;
- +
- + if (copy_from_user(&buf, ubuf, cnt))
- + return -EFAULT;
- +
- + buf[cnt] = 0;
- +
- + if (kstrtoul(buf, 10, &enable))
- + return -EINVAL;
- +
- + if ((enable && ed->enabled) || (!enable && !ed->enabled))
- + return cnt;
- +
- + if (enable) {
- + int ret;
- +
- + switch (ed->latency_type) {
- +#if defined(CONFIG_INTERRUPT_OFF_HIST) || defined(CONFIG_PREEMPT_OFF_HIST)
- + case PREEMPTIRQSOFF_LATENCY:
- + ret = register_trace_preemptirqsoff_hist(
- + probe_preemptirqsoff_hist, NULL);
- + if (ret) {
- + pr_info("wakeup trace: Couldn't assign "
- + "probe_preemptirqsoff_hist "
- + "to trace_preemptirqsoff_hist\n");
- + return ret;
- + }
- + break;
- +#endif
- +#ifdef CONFIG_WAKEUP_LATENCY_HIST
- + case WAKEUP_LATENCY:
- + ret = register_trace_sched_wakeup(
- + probe_wakeup_latency_hist_start, NULL);
- + if (ret) {
- + pr_info("wakeup trace: Couldn't assign "
- + "probe_wakeup_latency_hist_start "
- + "to trace_sched_wakeup\n");
- + return ret;
- + }
- + ret = register_trace_sched_wakeup_new(
- + probe_wakeup_latency_hist_start, NULL);
- + if (ret) {
- + pr_info("wakeup trace: Couldn't assign "
- + "probe_wakeup_latency_hist_start "
- + "to trace_sched_wakeup_new\n");
- + unregister_trace_sched_wakeup(
- + probe_wakeup_latency_hist_start, NULL);
- + return ret;
- + }
- + ret = register_trace_sched_switch(
- + probe_wakeup_latency_hist_stop, NULL);
- + if (ret) {
- + pr_info("wakeup trace: Couldn't assign "
- + "probe_wakeup_latency_hist_stop "
- + "to trace_sched_switch\n");
- + unregister_trace_sched_wakeup(
- + probe_wakeup_latency_hist_start, NULL);
- + unregister_trace_sched_wakeup_new(
- + probe_wakeup_latency_hist_start, NULL);
- + return ret;
- + }
- + ret = register_trace_sched_migrate_task(
- + probe_sched_migrate_task, NULL);
- + if (ret) {
- + pr_info("wakeup trace: Couldn't assign "
- + "probe_sched_migrate_task "
- + "to trace_sched_migrate_task\n");
- + unregister_trace_sched_wakeup(
- + probe_wakeup_latency_hist_start, NULL);
- + unregister_trace_sched_wakeup_new(
- + probe_wakeup_latency_hist_start, NULL);
- + unregister_trace_sched_switch(
- + probe_wakeup_latency_hist_stop, NULL);
- + return ret;
- + }
- + break;
- +#endif
- +#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST
- + case MISSED_TIMER_OFFSETS:
- + ret = register_trace_hrtimer_interrupt(
- + probe_hrtimer_interrupt, NULL);
- + if (ret) {
- + pr_info("wakeup trace: Couldn't assign "
- + "probe_hrtimer_interrupt "
- + "to trace_hrtimer_interrupt\n");
- + return ret;
- + }
- + break;
- +#endif
- +#if defined(CONFIG_WAKEUP_LATENCY_HIST) && \
- + defined(CONFIG_MISSED_TIMER_OFFSETS_HIST)
- + case TIMERANDWAKEUP_LATENCY:
- + if (!wakeup_latency_enabled_data.enabled ||
- + !missed_timer_offsets_enabled_data.enabled)
- + return -EINVAL;
- + break;
- +#endif
- + default:
- + break;
- + }
- + } else {
- + switch (ed->latency_type) {
- +#if defined(CONFIG_INTERRUPT_OFF_HIST) || defined(CONFIG_PREEMPT_OFF_HIST)
- + case PREEMPTIRQSOFF_LATENCY:
- + {
- + int cpu;
- +
- + unregister_trace_preemptirqsoff_hist(
- + probe_preemptirqsoff_hist, NULL);
- + for_each_online_cpu(cpu) {
- +#ifdef CONFIG_INTERRUPT_OFF_HIST
- + per_cpu(hist_irqsoff_counting,
- + cpu) = 0;
- +#endif
- +#ifdef CONFIG_PREEMPT_OFF_HIST
- + per_cpu(hist_preemptoff_counting,
- + cpu) = 0;
- +#endif
- +#if defined(CONFIG_INTERRUPT_OFF_HIST) && defined(CONFIG_PREEMPT_OFF_HIST)
- + per_cpu(hist_preemptirqsoff_counting,
- + cpu) = 0;
- +#endif
- + }
- + }
- + break;
- +#endif
- +#ifdef CONFIG_WAKEUP_LATENCY_HIST
- + case WAKEUP_LATENCY:
- + {
- + int cpu;
- +
- + unregister_trace_sched_wakeup(
- + probe_wakeup_latency_hist_start, NULL);
- + unregister_trace_sched_wakeup_new(
- + probe_wakeup_latency_hist_start, NULL);
- + unregister_trace_sched_switch(
- + probe_wakeup_latency_hist_stop, NULL);
- + unregister_trace_sched_migrate_task(
- + probe_sched_migrate_task, NULL);
- +
- + for_each_online_cpu(cpu) {
- + per_cpu(wakeup_task, cpu) = NULL;
- + per_cpu(wakeup_sharedprio, cpu) = 0;
- + }
- + }
- +#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST
- + timerandwakeup_enabled_data.enabled = 0;
- +#endif
- + break;
- +#endif
- +#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST
- + case MISSED_TIMER_OFFSETS:
- + unregister_trace_hrtimer_interrupt(
- + probe_hrtimer_interrupt, NULL);
- +#ifdef CONFIG_WAKEUP_LATENCY_HIST
- + timerandwakeup_enabled_data.enabled = 0;
- +#endif
- + break;
- +#endif
- + default:
- + break;
- + }
- + }
- + ed->enabled = enable;
- + return cnt;
- +}
- +
- +static const struct file_operations latency_hist_reset_fops = {
- + .open = tracing_open_generic,
- + .write = latency_hist_reset,
- +};
- +
- +static const struct file_operations enable_fops = {
- + .open = tracing_open_generic,
- + .read = show_enable,
- + .write = do_enable,
- +};
- +
- +#if defined(CONFIG_WAKEUP_LATENCY_HIST) || \
- + defined(CONFIG_MISSED_TIMER_OFFSETS_HIST)
- +static const struct file_operations pid_fops = {
- + .open = tracing_open_generic,
- + .read = show_pid,
- + .write = do_pid,
- +};
- +
- +static const struct file_operations maxlatproc_fops = {
- + .open = tracing_open_generic,
- + .read = show_maxlatproc,
- +};
- +#endif
- +
- +#if defined(CONFIG_INTERRUPT_OFF_HIST) || defined(CONFIG_PREEMPT_OFF_HIST)
- +static notrace void probe_preemptirqsoff_hist(void *v, int reason,
- + int starthist)
- +{
- + int cpu = raw_smp_processor_id();
- + int time_set = 0;
- +
- + if (starthist) {
- + cycle_t uninitialized_var(start);
- +
- + if (!preempt_count() && !irqs_disabled())
- + return;
- +
- +#ifdef CONFIG_INTERRUPT_OFF_HIST
- + if ((reason == IRQS_OFF || reason == TRACE_START) &&
- + !per_cpu(hist_irqsoff_counting, cpu)) {
- + per_cpu(hist_irqsoff_counting, cpu) = 1;
- + start = ftrace_now(cpu);
- + time_set++;
- + per_cpu(hist_irqsoff_start, cpu) = start;
- + }
- +#endif
- +
- +#ifdef CONFIG_PREEMPT_OFF_HIST
- + if ((reason == PREEMPT_OFF || reason == TRACE_START) &&
- + !per_cpu(hist_preemptoff_counting, cpu)) {
- + per_cpu(hist_preemptoff_counting, cpu) = 1;
- + if (!(time_set++))
- + start = ftrace_now(cpu);
- + per_cpu(hist_preemptoff_start, cpu) = start;
- + }
- +#endif
- +
- +#if defined(CONFIG_INTERRUPT_OFF_HIST) && defined(CONFIG_PREEMPT_OFF_HIST)
- + if (per_cpu(hist_irqsoff_counting, cpu) &&
- + per_cpu(hist_preemptoff_counting, cpu) &&
- + !per_cpu(hist_preemptirqsoff_counting, cpu)) {
- + per_cpu(hist_preemptirqsoff_counting, cpu) = 1;
- + if (!time_set)
- + start = ftrace_now(cpu);
- + per_cpu(hist_preemptirqsoff_start, cpu) = start;
- + }
- +#endif
- + } else {
- + cycle_t uninitialized_var(stop);
- +
- +#ifdef CONFIG_INTERRUPT_OFF_HIST
- + if ((reason == IRQS_ON || reason == TRACE_STOP) &&
- + per_cpu(hist_irqsoff_counting, cpu)) {
- + cycle_t start = per_cpu(hist_irqsoff_start, cpu);
- +
- + stop = ftrace_now(cpu);
- + time_set++;
- + if (start) {
- + long latency = ((long) (stop - start)) /
- + NSECS_PER_USECS;
- +
- + latency_hist(IRQSOFF_LATENCY, cpu, latency, 0,
- + stop, NULL);
- + }
- + per_cpu(hist_irqsoff_counting, cpu) = 0;
- + }
- +#endif
- +
- +#ifdef CONFIG_PREEMPT_OFF_HIST
- + if ((reason == PREEMPT_ON || reason == TRACE_STOP) &&
- + per_cpu(hist_preemptoff_counting, cpu)) {
- + cycle_t start = per_cpu(hist_preemptoff_start, cpu);
- +
- + if (!(time_set++))
- + stop = ftrace_now(cpu);
- + if (start) {
- + long latency = ((long) (stop - start)) /
- + NSECS_PER_USECS;
- +
- + latency_hist(PREEMPTOFF_LATENCY, cpu, latency,
- + 0, stop, NULL);
- + }
- + per_cpu(hist_preemptoff_counting, cpu) = 0;
- + }
- +#endif
- +
- +#if defined(CONFIG_INTERRUPT_OFF_HIST) && defined(CONFIG_PREEMPT_OFF_HIST)
- + if ((!per_cpu(hist_irqsoff_counting, cpu) ||
- + !per_cpu(hist_preemptoff_counting, cpu)) &&
- + per_cpu(hist_preemptirqsoff_counting, cpu)) {
- + cycle_t start = per_cpu(hist_preemptirqsoff_start, cpu);
- +
- + if (!time_set)
- + stop = ftrace_now(cpu);
- + if (start) {
- + long latency = ((long) (stop - start)) /
- + NSECS_PER_USECS;
- +
- + latency_hist(PREEMPTIRQSOFF_LATENCY, cpu,
- + latency, 0, stop, NULL);
- + }
- + per_cpu(hist_preemptirqsoff_counting, cpu) = 0;
- + }
- +#endif
- + }
- +}
- +#endif
- +
- +#ifdef CONFIG_WAKEUP_LATENCY_HIST
- +static DEFINE_RAW_SPINLOCK(wakeup_lock);
- +static notrace void probe_sched_migrate_task(void *v, struct task_struct *task,
- + int cpu)
- +{
- + int old_cpu = task_cpu(task);
- +
- + if (cpu != old_cpu) {
- + unsigned long flags;
- + struct task_struct *cpu_wakeup_task;
- +
- + raw_spin_lock_irqsave(&wakeup_lock, flags);
- +
- + cpu_wakeup_task = per_cpu(wakeup_task, old_cpu);
- + if (task == cpu_wakeup_task) {
- + put_task_struct(cpu_wakeup_task);
- + per_cpu(wakeup_task, old_cpu) = NULL;
- + cpu_wakeup_task = per_cpu(wakeup_task, cpu) = task;
- + get_task_struct(cpu_wakeup_task);
- + }
- +
- + raw_spin_unlock_irqrestore(&wakeup_lock, flags);
- + }
- +}
- +
- +static notrace void probe_wakeup_latency_hist_start(void *v,
- + struct task_struct *p)
- +{
- + unsigned long flags;
- + struct task_struct *curr = current;
- + int cpu = task_cpu(p);
- + struct task_struct *cpu_wakeup_task;
- +
- + raw_spin_lock_irqsave(&wakeup_lock, flags);
- +
- + cpu_wakeup_task = per_cpu(wakeup_task, cpu);
- +
- + if (wakeup_pid) {
- + if ((cpu_wakeup_task && p->prio == cpu_wakeup_task->prio) ||
- + p->prio == curr->prio)
- + per_cpu(wakeup_sharedprio, cpu) = 1;
- + if (likely(wakeup_pid != task_pid_nr(p)))
- + goto out;
- + } else {
- + if (likely(!rt_task(p)) ||
- + (cpu_wakeup_task && p->prio > cpu_wakeup_task->prio) ||
- + p->prio > curr->prio)
- + goto out;
- + if ((cpu_wakeup_task && p->prio == cpu_wakeup_task->prio) ||
- + p->prio == curr->prio)
- + per_cpu(wakeup_sharedprio, cpu) = 1;
- + }
- +
- + if (cpu_wakeup_task)
- + put_task_struct(cpu_wakeup_task);
- + cpu_wakeup_task = per_cpu(wakeup_task, cpu) = p;
- + get_task_struct(cpu_wakeup_task);
- + cpu_wakeup_task->preempt_timestamp_hist =
- + ftrace_now(raw_smp_processor_id());
- +out:
- + raw_spin_unlock_irqrestore(&wakeup_lock, flags);
- +}
- +
- +static notrace void probe_wakeup_latency_hist_stop(void *v,
- + struct task_struct *prev, struct task_struct *next)
- +{
- + unsigned long flags;
- + int cpu = task_cpu(next);
- + long latency;
- + cycle_t stop;
- + struct task_struct *cpu_wakeup_task;
- +
- + raw_spin_lock_irqsave(&wakeup_lock, flags);
- +
- + cpu_wakeup_task = per_cpu(wakeup_task, cpu);
- +
- + if (cpu_wakeup_task == NULL)
- + goto out;
- +
- + /* Already running? */
- + if (unlikely(current == cpu_wakeup_task))
- + goto out_reset;
- +
- + if (next != cpu_wakeup_task) {
- + if (next->prio < cpu_wakeup_task->prio)
- + goto out_reset;
- +
- + if (next->prio == cpu_wakeup_task->prio)
- + per_cpu(wakeup_sharedprio, cpu) = 1;
- +
- + goto out;
- + }
- +
- + if (current->prio == cpu_wakeup_task->prio)
- + per_cpu(wakeup_sharedprio, cpu) = 1;
- +
- + /*
- + * The task we are waiting for is about to be switched to.
- + * Calculate latency and store it in histogram.
- + */
- + stop = ftrace_now(raw_smp_processor_id());
- +
- + latency = ((long) (stop - next->preempt_timestamp_hist)) /
- + NSECS_PER_USECS;
- +
- + if (per_cpu(wakeup_sharedprio, cpu)) {
- + latency_hist(WAKEUP_LATENCY_SHAREDPRIO, cpu, latency, 0, stop,
- + next);
- + per_cpu(wakeup_sharedprio, cpu) = 0;
- + } else {
- + latency_hist(WAKEUP_LATENCY, cpu, latency, 0, stop, next);
- +#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST
- + if (timerandwakeup_enabled_data.enabled) {
- + latency_hist(TIMERANDWAKEUP_LATENCY, cpu,
- + next->timer_offset + latency, next->timer_offset,
- + stop, next);
- + }
- +#endif
- + }
- +
- +out_reset:
- +#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST
- + next->timer_offset = 0;
- +#endif
- + put_task_struct(cpu_wakeup_task);
- + per_cpu(wakeup_task, cpu) = NULL;
- +out:
- + raw_spin_unlock_irqrestore(&wakeup_lock, flags);
- +}
- +#endif
- +
- +#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST
- +static notrace void probe_hrtimer_interrupt(void *v, int cpu,
- + long long latency_ns, struct task_struct *curr,
- + struct task_struct *task)
- +{
- + if (latency_ns <= 0 && task != NULL && rt_task(task) &&
- + (task->prio < curr->prio ||
- + (task->prio == curr->prio &&
- + !cpumask_test_cpu(cpu, &task->cpus_allowed)))) {
- + long latency;
- + cycle_t now;
- +
- + if (missed_timer_offsets_pid) {
- + if (likely(missed_timer_offsets_pid !=
- + task_pid_nr(task)))
- + return;
- + }
- +
- + now = ftrace_now(cpu);
- + latency = (long) div_s64(-latency_ns, NSECS_PER_USECS);
- + latency_hist(MISSED_TIMER_OFFSETS, cpu, latency, latency, now,
- + task);
- +#ifdef CONFIG_WAKEUP_LATENCY_HIST
- + task->timer_offset = latency;
- +#endif
- + }
- +}
- +#endif
- +
- +static __init int latency_hist_init(void)
- +{
- + struct dentry *latency_hist_root = NULL;
- + struct dentry *dentry;
- +#ifdef CONFIG_WAKEUP_LATENCY_HIST
- + struct dentry *dentry_sharedprio;
- +#endif
- + struct dentry *entry;
- + struct dentry *enable_root;
- + int i = 0;
- + struct hist_data *my_hist;
- + char name[64];
- + char *cpufmt = "CPU%d";
- +#if defined(CONFIG_WAKEUP_LATENCY_HIST) || \
- + defined(CONFIG_MISSED_TIMER_OFFSETS_HIST)
- + char *cpufmt_maxlatproc = "max_latency-CPU%d";
- + struct maxlatproc_data *mp = NULL;
- +#endif
- +
- + dentry = tracing_init_dentry();
- + latency_hist_root = debugfs_create_dir(latency_hist_dir_root, dentry);
- + enable_root = debugfs_create_dir("enable", latency_hist_root);
- +
- +#ifdef CONFIG_INTERRUPT_OFF_HIST
- + dentry = debugfs_create_dir(irqsoff_hist_dir, latency_hist_root);
- + for_each_possible_cpu(i) {
- + sprintf(name, cpufmt, i);
- + entry = debugfs_create_file(name, 0444, dentry,
- + &per_cpu(irqsoff_hist, i), &latency_hist_fops);
- + my_hist = &per_cpu(irqsoff_hist, i);
- + atomic_set(&my_hist->hist_mode, 1);
- + my_hist->min_lat = LONG_MAX;
- + }
- + entry = debugfs_create_file("reset", 0644, dentry,
- + (void *)IRQSOFF_LATENCY, &latency_hist_reset_fops);
- +#endif
- +
- +#ifdef CONFIG_PREEMPT_OFF_HIST
- + dentry = debugfs_create_dir(preemptoff_hist_dir,
- + latency_hist_root);
- + for_each_possible_cpu(i) {
- + sprintf(name, cpufmt, i);
- + entry = debugfs_create_file(name, 0444, dentry,
- + &per_cpu(preemptoff_hist, i), &latency_hist_fops);
- + my_hist = &per_cpu(preemptoff_hist, i);
- + atomic_set(&my_hist->hist_mode, 1);
- + my_hist->min_lat = LONG_MAX;
- + }
- + entry = debugfs_create_file("reset", 0644, dentry,
- + (void *)PREEMPTOFF_LATENCY, &latency_hist_reset_fops);
- +#endif
- +
- +#if defined(CONFIG_INTERRUPT_OFF_HIST) && defined(CONFIG_PREEMPT_OFF_HIST)
- + dentry = debugfs_create_dir(preemptirqsoff_hist_dir,
- + latency_hist_root);
- + for_each_possible_cpu(i) {
- + sprintf(name, cpufmt, i);
- + entry = debugfs_create_file(name, 0444, dentry,
- + &per_cpu(preemptirqsoff_hist, i), &latency_hist_fops);
- + my_hist = &per_cpu(preemptirqsoff_hist, i);
- + atomic_set(&my_hist->hist_mode, 1);
- + my_hist->min_lat = LONG_MAX;
- + }
- + entry = debugfs_create_file("reset", 0644, dentry,
- + (void *)PREEMPTIRQSOFF_LATENCY, &latency_hist_reset_fops);
- +#endif
- +
- +#if defined(CONFIG_INTERRUPT_OFF_HIST) || defined(CONFIG_PREEMPT_OFF_HIST)
- + entry = debugfs_create_file("preemptirqsoff", 0644,
- + enable_root, (void *)&preemptirqsoff_enabled_data,
- + &enable_fops);
- +#endif
- +
- +#ifdef CONFIG_WAKEUP_LATENCY_HIST
- + dentry = debugfs_create_dir(wakeup_latency_hist_dir,
- + latency_hist_root);
- + dentry_sharedprio = debugfs_create_dir(
- + wakeup_latency_hist_dir_sharedprio, dentry);
- + for_each_possible_cpu(i) {
- + sprintf(name, cpufmt, i);
- +
- + entry = debugfs_create_file(name, 0444, dentry,
- + &per_cpu(wakeup_latency_hist, i),
- + &latency_hist_fops);
- + my_hist = &per_cpu(wakeup_latency_hist, i);
- + atomic_set(&my_hist->hist_mode, 1);
- + my_hist->min_lat = LONG_MAX;
- +
- + entry = debugfs_create_file(name, 0444, dentry_sharedprio,
- + &per_cpu(wakeup_latency_hist_sharedprio, i),
- + &latency_hist_fops);
- + my_hist = &per_cpu(wakeup_latency_hist_sharedprio, i);
- + atomic_set(&my_hist->hist_mode, 1);
- + my_hist->min_lat = LONG_MAX;
- +
- + sprintf(name, cpufmt_maxlatproc, i);
- +
- + mp = &per_cpu(wakeup_maxlatproc, i);
- + entry = debugfs_create_file(name, 0444, dentry, mp,
- + &maxlatproc_fops);
- + clear_maxlatprocdata(mp);
- +
- + mp = &per_cpu(wakeup_maxlatproc_sharedprio, i);
- + entry = debugfs_create_file(name, 0444, dentry_sharedprio, mp,
- + &maxlatproc_fops);
- + clear_maxlatprocdata(mp);
- + }
- + entry = debugfs_create_file("pid", 0644, dentry,
- + (void *)&wakeup_pid, &pid_fops);
- + entry = debugfs_create_file("reset", 0644, dentry,
- + (void *)WAKEUP_LATENCY, &latency_hist_reset_fops);
- + entry = debugfs_create_file("reset", 0644, dentry_sharedprio,
- + (void *)WAKEUP_LATENCY_SHAREDPRIO, &latency_hist_reset_fops);
- + entry = debugfs_create_file("wakeup", 0644,
- + enable_root, (void *)&wakeup_latency_enabled_data,
- + &enable_fops);
- +#endif
- +
- +#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST
- + dentry = debugfs_create_dir(missed_timer_offsets_dir,
- + latency_hist_root);
- + for_each_possible_cpu(i) {
- + sprintf(name, cpufmt, i);
- + entry = debugfs_create_file(name, 0444, dentry,
- + &per_cpu(missed_timer_offsets, i), &latency_hist_fops);
- + my_hist = &per_cpu(missed_timer_offsets, i);
- + atomic_set(&my_hist->hist_mode, 1);
- + my_hist->min_lat = LONG_MAX;
- +
- + sprintf(name, cpufmt_maxlatproc, i);
- + mp = &per_cpu(missed_timer_offsets_maxlatproc, i);
- + entry = debugfs_create_file(name, 0444, dentry, mp,
- + &maxlatproc_fops);
- + clear_maxlatprocdata(mp);
- + }
- + entry = debugfs_create_file("pid", 0644, dentry,
- + (void *)&missed_timer_offsets_pid, &pid_fops);
- + entry = debugfs_create_file("reset", 0644, dentry,
- + (void *)MISSED_TIMER_OFFSETS, &latency_hist_reset_fops);
- + entry = debugfs_create_file("missed_timer_offsets", 0644,
- + enable_root, (void *)&missed_timer_offsets_enabled_data,
- + &enable_fops);
- +#endif
- +
- +#if defined(CONFIG_WAKEUP_LATENCY_HIST) && \
- + defined(CONFIG_MISSED_TIMER_OFFSETS_HIST)
- + dentry = debugfs_create_dir(timerandwakeup_latency_hist_dir,
- + latency_hist_root);
- + for_each_possible_cpu(i) {
- + sprintf(name, cpufmt, i);
- + entry = debugfs_create_file(name, 0444, dentry,
- + &per_cpu(timerandwakeup_latency_hist, i),
- + &latency_hist_fops);
- + my_hist = &per_cpu(timerandwakeup_latency_hist, i);
- + atomic_set(&my_hist->hist_mode, 1);
- + my_hist->min_lat = LONG_MAX;
- +
- + sprintf(name, cpufmt_maxlatproc, i);
- + mp = &per_cpu(timerandwakeup_maxlatproc, i);
- + entry = debugfs_create_file(name, 0444, dentry, mp,
- + &maxlatproc_fops);
- + clear_maxlatprocdata(mp);
- + }
- + entry = debugfs_create_file("reset", 0644, dentry,
- + (void *)TIMERANDWAKEUP_LATENCY, &latency_hist_reset_fops);
- + entry = debugfs_create_file("timerandwakeup", 0644,
- + enable_root, (void *)&timerandwakeup_enabled_data,
- + &enable_fops);
- +#endif
- + return 0;
- +}
- +
- +device_initcall(latency_hist_init);
- diff -Nur linux-4.1.39.orig/kernel/trace/Makefile linux-4.1.39/kernel/trace/Makefile
- --- linux-4.1.39.orig/kernel/trace/Makefile 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/trace/Makefile 2017-04-18 17:56:30.641398216 +0200
- @@ -36,6 +36,10 @@
- obj-$(CONFIG_IRQSOFF_TRACER) += trace_irqsoff.o
- obj-$(CONFIG_PREEMPT_TRACER) += trace_irqsoff.o
- obj-$(CONFIG_SCHED_TRACER) += trace_sched_wakeup.o
- +obj-$(CONFIG_INTERRUPT_OFF_HIST) += latency_hist.o
- +obj-$(CONFIG_PREEMPT_OFF_HIST) += latency_hist.o
- +obj-$(CONFIG_WAKEUP_LATENCY_HIST) += latency_hist.o
- +obj-$(CONFIG_MISSED_TIMER_OFFSETS_HIST) += latency_hist.o
- obj-$(CONFIG_NOP_TRACER) += trace_nop.o
- obj-$(CONFIG_STACK_TRACER) += trace_stack.o
- obj-$(CONFIG_MMIOTRACE) += trace_mmiotrace.o
- diff -Nur linux-4.1.39.orig/kernel/trace/trace.c linux-4.1.39/kernel/trace/trace.c
- --- linux-4.1.39.orig/kernel/trace/trace.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/trace/trace.c 2017-04-18 17:56:30.641398216 +0200
- @@ -1630,6 +1630,7 @@
- struct task_struct *tsk = current;
-
- entry->preempt_count = pc & 0xff;
- + entry->preempt_lazy_count = preempt_lazy_count();
- entry->pid = (tsk) ? tsk->pid : 0;
- entry->flags =
- #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
- @@ -1639,8 +1640,11 @@
- #endif
- ((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) |
- ((pc & SOFTIRQ_MASK) ? TRACE_FLAG_SOFTIRQ : 0) |
- - (tif_need_resched() ? TRACE_FLAG_NEED_RESCHED : 0) |
- + (tif_need_resched_now() ? TRACE_FLAG_NEED_RESCHED : 0) |
- + (need_resched_lazy() ? TRACE_FLAG_NEED_RESCHED_LAZY : 0) |
- (test_preempt_need_resched() ? TRACE_FLAG_PREEMPT_RESCHED : 0);
- +
- + entry->migrate_disable = (tsk) ? __migrate_disabled(tsk) & 0xFF : 0;
- }
- EXPORT_SYMBOL_GPL(tracing_generic_entry_update);
-
- @@ -2558,14 +2562,17 @@
-
- static void print_lat_help_header(struct seq_file *m)
- {
- - seq_puts(m, "# _------=> CPU# \n"
- - "# / _-----=> irqs-off \n"
- - "# | / _----=> need-resched \n"
- - "# || / _---=> hardirq/softirq \n"
- - "# ||| / _--=> preempt-depth \n"
- - "# |||| / delay \n"
- - "# cmd pid ||||| time | caller \n"
- - "# \\ / ||||| \\ | / \n");
- + seq_puts(m, "# _--------=> CPU# \n"
- + "# / _-------=> irqs-off \n"
- + "# | / _------=> need-resched \n"
- + "# || / _-----=> need-resched_lazy \n"
- + "# ||| / _----=> hardirq/softirq \n"
- + "# |||| / _---=> preempt-depth \n"
- + "# ||||| / _--=> preempt-lazy-depth\n"
- + "# |||||| / _-=> migrate-disable \n"
- + "# ||||||| / delay \n"
- + "# cmd pid |||||||| time | caller \n"
- + "# \\ / |||||||| \\ | / \n");
- }
-
- static void print_event_info(struct trace_buffer *buf, struct seq_file *m)
- @@ -2591,11 +2598,14 @@
- print_event_info(buf, m);
- seq_puts(m, "# _-----=> irqs-off\n"
- "# / _----=> need-resched\n"
- - "# | / _---=> hardirq/softirq\n"
- - "# || / _--=> preempt-depth\n"
- - "# ||| / delay\n"
- - "# TASK-PID CPU# |||| TIMESTAMP FUNCTION\n"
- - "# | | | |||| | |\n");
- + "# |/ _-----=> need-resched_lazy\n"
- + "# || / _---=> hardirq/softirq\n"
- + "# ||| / _--=> preempt-depth\n"
- + "# |||| / _-=> preempt-lazy-depth\n"
- + "# ||||| / _-=> migrate-disable \n"
- + "# |||||| / delay\n"
- + "# TASK-PID CPU# ||||||| TIMESTAMP FUNCTION\n"
- + "# | | | ||||||| | |\n");
- }
-
- void
- diff -Nur linux-4.1.39.orig/kernel/trace/trace_events.c linux-4.1.39/kernel/trace/trace_events.c
- --- linux-4.1.39.orig/kernel/trace/trace_events.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/trace/trace_events.c 2017-04-18 17:56:30.645398372 +0200
- @@ -162,6 +162,8 @@
- __common_field(unsigned char, flags);
- __common_field(unsigned char, preempt_count);
- __common_field(int, pid);
- + __common_field(unsigned short, migrate_disable);
- + __common_field(unsigned short, padding);
-
- return ret;
- }
- @@ -198,6 +200,14 @@
-
- local_save_flags(fbuffer->flags);
- fbuffer->pc = preempt_count();
- + /*
- + * If CONFIG_PREEMPT is enabled, then the tracepoint itself disables
- + * preemption (adding one to the preempt_count). Since we are
- + * interested in the preempt_count at the time the tracepoint was
- + * hit, we need to subtract one to offset the increment.
- + */
- + if (IS_ENABLED(CONFIG_PREEMPT))
- + fbuffer->pc--;
- fbuffer->ftrace_file = ftrace_file;
-
- fbuffer->event =
- diff -Nur linux-4.1.39.orig/kernel/trace/trace.h linux-4.1.39/kernel/trace/trace.h
- --- linux-4.1.39.orig/kernel/trace/trace.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/trace/trace.h 2017-04-18 17:56:30.641398216 +0200
- @@ -120,6 +120,7 @@
- * NEED_RESCHED - reschedule is requested
- * HARDIRQ - inside an interrupt handler
- * SOFTIRQ - inside a softirq handler
- + * NEED_RESCHED_LAZY - lazy reschedule is requested
- */
- enum trace_flag_type {
- TRACE_FLAG_IRQS_OFF = 0x01,
- @@ -128,6 +129,7 @@
- TRACE_FLAG_HARDIRQ = 0x08,
- TRACE_FLAG_SOFTIRQ = 0x10,
- TRACE_FLAG_PREEMPT_RESCHED = 0x20,
- + TRACE_FLAG_NEED_RESCHED_LAZY = 0x40,
- };
-
- #define TRACE_BUF_SIZE 1024
- diff -Nur linux-4.1.39.orig/kernel/trace/trace_irqsoff.c linux-4.1.39/kernel/trace/trace_irqsoff.c
- --- linux-4.1.39.orig/kernel/trace/trace_irqsoff.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/trace/trace_irqsoff.c 2017-04-18 17:56:30.645398372 +0200
- @@ -13,6 +13,7 @@
- #include <linux/uaccess.h>
- #include <linux/module.h>
- #include <linux/ftrace.h>
- +#include <trace/events/hist.h>
-
- #include "trace.h"
-
- @@ -433,11 +434,13 @@
- {
- if (preempt_trace() || irq_trace())
- start_critical_timing(CALLER_ADDR0, CALLER_ADDR1);
- + trace_preemptirqsoff_hist_rcuidle(TRACE_START, 1);
- }
- EXPORT_SYMBOL_GPL(start_critical_timings);
-
- void stop_critical_timings(void)
- {
- + trace_preemptirqsoff_hist_rcuidle(TRACE_STOP, 0);
- if (preempt_trace() || irq_trace())
- stop_critical_timing(CALLER_ADDR0, CALLER_ADDR1);
- }
- @@ -447,6 +450,7 @@
- #ifdef CONFIG_PROVE_LOCKING
- void time_hardirqs_on(unsigned long a0, unsigned long a1)
- {
- + trace_preemptirqsoff_hist_rcuidle(IRQS_ON, 0);
- if (!preempt_trace() && irq_trace())
- stop_critical_timing(a0, a1);
- }
- @@ -455,6 +459,7 @@
- {
- if (!preempt_trace() && irq_trace())
- start_critical_timing(a0, a1);
- + trace_preemptirqsoff_hist_rcuidle(IRQS_OFF, 1);
- }
-
- #else /* !CONFIG_PROVE_LOCKING */
- @@ -480,6 +485,7 @@
- */
- void trace_hardirqs_on(void)
- {
- + trace_preemptirqsoff_hist_rcuidle(IRQS_ON, 0);
- if (!preempt_trace() && irq_trace())
- stop_critical_timing(CALLER_ADDR0, CALLER_ADDR1);
- }
- @@ -489,11 +495,13 @@
- {
- if (!preempt_trace() && irq_trace())
- start_critical_timing(CALLER_ADDR0, CALLER_ADDR1);
- + trace_preemptirqsoff_hist_rcuidle(IRQS_OFF, 1);
- }
- EXPORT_SYMBOL(trace_hardirqs_off);
-
- __visible void trace_hardirqs_on_caller(unsigned long caller_addr)
- {
- + trace_preemptirqsoff_hist(IRQS_ON, 0);
- if (!preempt_trace() && irq_trace())
- stop_critical_timing(CALLER_ADDR0, caller_addr);
- }
- @@ -503,6 +511,7 @@
- {
- if (!preempt_trace() && irq_trace())
- start_critical_timing(CALLER_ADDR0, caller_addr);
- + trace_preemptirqsoff_hist(IRQS_OFF, 1);
- }
- EXPORT_SYMBOL(trace_hardirqs_off_caller);
-
- @@ -512,12 +521,14 @@
- #ifdef CONFIG_PREEMPT_TRACER
- void trace_preempt_on(unsigned long a0, unsigned long a1)
- {
- + trace_preemptirqsoff_hist(PREEMPT_ON, 0);
- if (preempt_trace() && !irq_trace())
- stop_critical_timing(a0, a1);
- }
-
- void trace_preempt_off(unsigned long a0, unsigned long a1)
- {
- + trace_preemptirqsoff_hist(PREEMPT_ON, 1);
- if (preempt_trace() && !irq_trace())
- start_critical_timing(a0, a1);
- }
- diff -Nur linux-4.1.39.orig/kernel/trace/trace_output.c linux-4.1.39/kernel/trace/trace_output.c
- --- linux-4.1.39.orig/kernel/trace/trace_output.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/trace/trace_output.c 2017-04-18 17:56:30.645398372 +0200
- @@ -430,6 +430,7 @@
- {
- char hardsoft_irq;
- char need_resched;
- + char need_resched_lazy;
- char irqs_off;
- int hardirq;
- int softirq;
- @@ -457,6 +458,8 @@
- need_resched = '.';
- break;
- }
- + need_resched_lazy =
- + (entry->flags & TRACE_FLAG_NEED_RESCHED_LAZY) ? 'L' : '.';
-
- hardsoft_irq =
- (hardirq && softirq) ? 'H' :
- @@ -464,14 +467,25 @@
- softirq ? 's' :
- '.';
-
- - trace_seq_printf(s, "%c%c%c",
- - irqs_off, need_resched, hardsoft_irq);
- + trace_seq_printf(s, "%c%c%c%c",
- + irqs_off, need_resched, need_resched_lazy,
- + hardsoft_irq);
-
- if (entry->preempt_count)
- trace_seq_printf(s, "%x", entry->preempt_count);
- else
- trace_seq_putc(s, '.');
-
- + if (entry->preempt_lazy_count)
- + trace_seq_printf(s, "%x", entry->preempt_lazy_count);
- + else
- + trace_seq_putc(s, '.');
- +
- + if (entry->migrate_disable)
- + trace_seq_printf(s, "%x", entry->migrate_disable);
- + else
- + trace_seq_putc(s, '.');
- +
- return !trace_seq_has_overflowed(s);
- }
-
- diff -Nur linux-4.1.39.orig/kernel/trace/trace_sched_switch.c linux-4.1.39/kernel/trace/trace_sched_switch.c
- --- linux-4.1.39.orig/kernel/trace/trace_sched_switch.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/trace/trace_sched_switch.c 2017-04-18 17:56:30.645398372 +0200
- @@ -26,7 +26,7 @@
- }
-
- static void
- -probe_sched_wakeup(void *ignore, struct task_struct *wakee, int success)
- +probe_sched_wakeup(void *ignore, struct task_struct *wakee)
- {
- if (unlikely(!sched_ref))
- return;
- diff -Nur linux-4.1.39.orig/kernel/trace/trace_sched_wakeup.c linux-4.1.39/kernel/trace/trace_sched_wakeup.c
- --- linux-4.1.39.orig/kernel/trace/trace_sched_wakeup.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/trace/trace_sched_wakeup.c 2017-04-18 17:56:30.645398372 +0200
- @@ -514,7 +514,7 @@
- }
-
- static void
- -probe_wakeup(void *ignore, struct task_struct *p, int success)
- +probe_wakeup(void *ignore, struct task_struct *p)
- {
- struct trace_array_cpu *data;
- int cpu = smp_processor_id();
- diff -Nur linux-4.1.39.orig/kernel/user.c linux-4.1.39/kernel/user.c
- --- linux-4.1.39.orig/kernel/user.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/user.c 2017-04-18 17:56:30.645398372 +0200
- @@ -161,11 +161,11 @@
- if (!up)
- return;
-
- - local_irq_save(flags);
- + local_irq_save_nort(flags);
- if (atomic_dec_and_lock(&up->__count, &uidhash_lock))
- free_user(up, flags);
- else
- - local_irq_restore(flags);
- + local_irq_restore_nort(flags);
- }
-
- struct user_struct *alloc_uid(kuid_t uid)
- diff -Nur linux-4.1.39.orig/kernel/watchdog.c linux-4.1.39/kernel/watchdog.c
- --- linux-4.1.39.orig/kernel/watchdog.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/watchdog.c 2017-04-18 17:56:30.645398372 +0200
- @@ -262,6 +262,8 @@
-
- #ifdef CONFIG_HARDLOCKUP_DETECTOR
-
- +static DEFINE_RAW_SPINLOCK(watchdog_output_lock);
- +
- static struct perf_event_attr wd_hw_attr = {
- .type = PERF_TYPE_HARDWARE,
- .config = PERF_COUNT_HW_CPU_CYCLES,
- @@ -295,13 +297,21 @@
- /* only print hardlockups once */
- if (__this_cpu_read(hard_watchdog_warn) == true)
- return;
- + /*
- + * If early-printk is enabled then make sure we do not
- + * lock up in printk() and kill console logging:
- + */
- + printk_kill();
-
- - if (hardlockup_panic)
- + if (hardlockup_panic) {
- panic("Watchdog detected hard LOCKUP on cpu %d",
- this_cpu);
- - else
- + } else {
- + raw_spin_lock(&watchdog_output_lock);
- WARN(1, "Watchdog detected hard LOCKUP on cpu %d",
- this_cpu);
- + raw_spin_unlock(&watchdog_output_lock);
- + }
-
- __this_cpu_write(hard_watchdog_warn, true);
- return;
- @@ -444,6 +454,7 @@
- /* kick off the timer for the hardlockup detector */
- hrtimer_init(hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
- hrtimer->function = watchdog_timer_fn;
- + hrtimer->irqsafe = 1;
-
- /* Enable the perf event */
- watchdog_nmi_enable(cpu);
- diff -Nur linux-4.1.39.orig/kernel/workqueue.c linux-4.1.39/kernel/workqueue.c
- --- linux-4.1.39.orig/kernel/workqueue.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/workqueue.c 2017-04-18 17:56:30.645398372 +0200
- @@ -48,6 +48,8 @@
- #include <linux/nodemask.h>
- #include <linux/moduleparam.h>
- #include <linux/uaccess.h>
- +#include <linux/locallock.h>
- +#include <linux/delay.h>
-
- #include "workqueue_internal.h"
-
- @@ -121,11 +123,16 @@
- * cpu or grabbing pool->lock is enough for read access. If
- * POOL_DISASSOCIATED is set, it's identical to L.
- *
- + * On RT we need the extra protection via rt_lock_idle_list() for
- + * the list manipulations against read access from
- + * wq_worker_sleeping(). All other places are nicely serialized via
- + * pool->lock.
- + *
- * A: pool->attach_mutex protected.
- *
- * PL: wq_pool_mutex protected.
- *
- - * PR: wq_pool_mutex protected for writes. Sched-RCU protected for reads.
- + * PR: wq_pool_mutex protected for writes. RCU protected for reads.
- *
- * PW: wq_pool_mutex and wq->mutex protected for writes. Either for reads.
- *
- @@ -134,7 +141,7 @@
- *
- * WQ: wq->mutex protected.
- *
- - * WR: wq->mutex protected for writes. Sched-RCU protected for reads.
- + * WR: wq->mutex protected for writes. RCU protected for reads.
- *
- * MD: wq_mayday_lock protected.
- */
- @@ -183,7 +190,7 @@
- atomic_t nr_running ____cacheline_aligned_in_smp;
-
- /*
- - * Destruction of pool is sched-RCU protected to allow dereferences
- + * Destruction of pool is RCU protected to allow dereferences
- * from get_work_pool().
- */
- struct rcu_head rcu;
- @@ -212,7 +219,7 @@
- /*
- * Release of unbound pwq is punted to system_wq. See put_pwq()
- * and pwq_unbound_release_workfn() for details. pool_workqueue
- - * itself is also sched-RCU protected so that the first pwq can be
- + * itself is also RCU protected so that the first pwq can be
- * determined without grabbing wq->mutex.
- */
- struct work_struct unbound_release_work;
- @@ -334,6 +341,8 @@
- struct workqueue_struct *system_freezable_power_efficient_wq __read_mostly;
- EXPORT_SYMBOL_GPL(system_freezable_power_efficient_wq);
-
- +static DEFINE_LOCAL_IRQ_LOCK(pendingb_lock);
- +
- static int worker_thread(void *__worker);
- static void copy_workqueue_attrs(struct workqueue_attrs *to,
- const struct workqueue_attrs *from);
- @@ -343,14 +352,14 @@
- #include <trace/events/workqueue.h>
-
- #define assert_rcu_or_pool_mutex() \
- - rcu_lockdep_assert(rcu_read_lock_sched_held() || \
- + rcu_lockdep_assert(rcu_read_lock_held() || \
- lockdep_is_held(&wq_pool_mutex), \
- - "sched RCU or wq_pool_mutex should be held")
- + "RCU or wq_pool_mutex should be held")
-
- #define assert_rcu_or_wq_mutex(wq) \
- - rcu_lockdep_assert(rcu_read_lock_sched_held() || \
- + rcu_lockdep_assert(rcu_read_lock_held() || \
- lockdep_is_held(&wq->mutex), \
- - "sched RCU or wq->mutex should be held")
- + "RCU or wq->mutex should be held")
-
- #define assert_rcu_or_wq_mutex_or_pool_mutex(wq) \
- rcu_lockdep_assert(rcu_read_lock_sched_held() || \
- @@ -368,7 +377,7 @@
- * @pool: iteration cursor
- * @pi: integer used for iteration
- *
- - * This must be called either with wq_pool_mutex held or sched RCU read
- + * This must be called either with wq_pool_mutex held or RCU read
- * locked. If the pool needs to be used beyond the locking in effect, the
- * caller is responsible for guaranteeing that the pool stays online.
- *
- @@ -400,7 +409,7 @@
- * @pwq: iteration cursor
- * @wq: the target workqueue
- *
- - * This must be called either with wq->mutex held or sched RCU read locked.
- + * This must be called either with wq->mutex held or RCU read locked.
- * If the pwq needs to be used beyond the locking in effect, the caller is
- * responsible for guaranteeing that the pwq stays online.
- *
- @@ -412,6 +421,31 @@
- if (({ assert_rcu_or_wq_mutex(wq); false; })) { } \
- else
-
- +#ifdef CONFIG_PREEMPT_RT_BASE
- +static inline void rt_lock_idle_list(struct worker_pool *pool)
- +{
- + preempt_disable();
- +}
- +static inline void rt_unlock_idle_list(struct worker_pool *pool)
- +{
- + preempt_enable();
- +}
- +static inline void sched_lock_idle_list(struct worker_pool *pool) { }
- +static inline void sched_unlock_idle_list(struct worker_pool *pool) { }
- +#else
- +static inline void rt_lock_idle_list(struct worker_pool *pool) { }
- +static inline void rt_unlock_idle_list(struct worker_pool *pool) { }
- +static inline void sched_lock_idle_list(struct worker_pool *pool)
- +{
- + spin_lock_irq(&pool->lock);
- +}
- +static inline void sched_unlock_idle_list(struct worker_pool *pool)
- +{
- + spin_unlock_irq(&pool->lock);
- +}
- +#endif
- +
- +
- #ifdef CONFIG_DEBUG_OBJECTS_WORK
-
- static struct debug_obj_descr work_debug_descr;
- @@ -562,8 +596,7 @@
- * @wq: the target workqueue
- * @node: the node ID
- *
- - * This must be called with any of wq_pool_mutex, wq->mutex or sched RCU
- - * read locked.
- + * This must be called with any of wq_pool_mutex, wq->mutex or RCU read locked.
- * If the pwq needs to be used beyond the locking in effect, the caller is
- * responsible for guaranteeing that the pwq stays online.
- *
- @@ -706,8 +739,8 @@
- * @work: the work item of interest
- *
- * Pools are created and destroyed under wq_pool_mutex, and allows read
- - * access under sched-RCU read lock. As such, this function should be
- - * called under wq_pool_mutex or with preemption disabled.
- + * access under RCU read lock. As such, this function should be
- + * called under wq_pool_mutex or inside of a rcu_read_lock() region.
- *
- * All fields of the returned pool are accessible as long as the above
- * mentioned locking is in effect. If the returned pool needs to be used
- @@ -844,51 +877,44 @@
- */
- static void wake_up_worker(struct worker_pool *pool)
- {
- - struct worker *worker = first_idle_worker(pool);
- + struct worker *worker;
- +
- + rt_lock_idle_list(pool);
- +
- + worker = first_idle_worker(pool);
-
- if (likely(worker))
- wake_up_process(worker->task);
- +
- + rt_unlock_idle_list(pool);
- }
-
- /**
- - * wq_worker_waking_up - a worker is waking up
- - * @task: task waking up
- - * @cpu: CPU @task is waking up to
- - *
- - * This function is called during try_to_wake_up() when a worker is
- - * being awoken.
- + * wq_worker_running - a worker is running again
- + * @task: task returning from sleep
- *
- - * CONTEXT:
- - * spin_lock_irq(rq->lock)
- + * This function is called when a worker returns from schedule()
- */
- -void wq_worker_waking_up(struct task_struct *task, int cpu)
- +void wq_worker_running(struct task_struct *task)
- {
- struct worker *worker = kthread_data(task);
-
- - if (!(worker->flags & WORKER_NOT_RUNNING)) {
- - WARN_ON_ONCE(worker->pool->cpu != cpu);
- + if (!worker->sleeping)
- + return;
- + if (!(worker->flags & WORKER_NOT_RUNNING))
- atomic_inc(&worker->pool->nr_running);
- - }
- + worker->sleeping = 0;
- }
-
- /**
- * wq_worker_sleeping - a worker is going to sleep
- * @task: task going to sleep
- - * @cpu: CPU in question, must be the current CPU number
- - *
- - * This function is called during schedule() when a busy worker is
- - * going to sleep. Worker on the same cpu can be woken up by
- - * returning pointer to its task.
- - *
- - * CONTEXT:
- - * spin_lock_irq(rq->lock)
- - *
- - * Return:
- - * Worker task on @cpu to wake up, %NULL if none.
- + * This function is called from schedule() when a busy worker is
- + * going to sleep.
- */
- -struct task_struct *wq_worker_sleeping(struct task_struct *task, int cpu)
- +void wq_worker_sleeping(struct task_struct *task)
- {
- - struct worker *worker = kthread_data(task), *to_wakeup = NULL;
- + struct worker *worker = kthread_data(task);
- struct worker_pool *pool;
-
- /*
- @@ -897,29 +923,26 @@
- * checking NOT_RUNNING.
- */
- if (worker->flags & WORKER_NOT_RUNNING)
- - return NULL;
- + return;
-
- pool = worker->pool;
-
- - /* this can only happen on the local cpu */
- - if (WARN_ON_ONCE(cpu != raw_smp_processor_id() || pool->cpu != cpu))
- - return NULL;
- + if (WARN_ON_ONCE(worker->sleeping))
- + return;
- +
- + worker->sleeping = 1;
-
- /*
- * The counterpart of the following dec_and_test, implied mb,
- * worklist not empty test sequence is in insert_work().
- * Please read comment there.
- - *
- - * NOT_RUNNING is clear. This means that we're bound to and
- - * running on the local cpu w/ rq lock held and preemption
- - * disabled, which in turn means that none else could be
- - * manipulating idle_list, so dereferencing idle_list without pool
- - * lock is safe.
- */
- if (atomic_dec_and_test(&pool->nr_running) &&
- - !list_empty(&pool->worklist))
- - to_wakeup = first_idle_worker(pool);
- - return to_wakeup ? to_wakeup->task : NULL;
- + !list_empty(&pool->worklist)) {
- + sched_lock_idle_list(pool);
- + wake_up_worker(pool);
- + sched_unlock_idle_list(pool);
- + }
- }
-
- /**
- @@ -1113,12 +1136,14 @@
- {
- if (pwq) {
- /*
- - * As both pwqs and pools are sched-RCU protected, the
- + * As both pwqs and pools are RCU protected, the
- * following lock operations are safe.
- */
- - spin_lock_irq(&pwq->pool->lock);
- + rcu_read_lock();
- + local_spin_lock_irq(pendingb_lock, &pwq->pool->lock);
- put_pwq(pwq);
- - spin_unlock_irq(&pwq->pool->lock);
- + local_spin_unlock_irq(pendingb_lock, &pwq->pool->lock);
- + rcu_read_unlock();
- }
- }
-
- @@ -1220,7 +1245,7 @@
- struct worker_pool *pool;
- struct pool_workqueue *pwq;
-
- - local_irq_save(*flags);
- + local_lock_irqsave(pendingb_lock, *flags);
-
- /* try to steal the timer if it exists */
- if (is_dwork) {
- @@ -1239,6 +1264,7 @@
- if (!test_and_set_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work)))
- return 0;
-
- + rcu_read_lock();
- /*
- * The queueing is in progress, or it is already queued. Try to
- * steal it from ->worklist without clearing WORK_STRUCT_PENDING.
- @@ -1277,14 +1303,16 @@
- set_work_pool_and_keep_pending(work, pool->id);
-
- spin_unlock(&pool->lock);
- + rcu_read_unlock();
- return 1;
- }
- spin_unlock(&pool->lock);
- fail:
- - local_irq_restore(*flags);
- + rcu_read_unlock();
- + local_unlock_irqrestore(pendingb_lock, *flags);
- if (work_is_canceling(work))
- return -ENOENT;
- - cpu_relax();
- + cpu_chill();
- return -EAGAIN;
- }
-
- @@ -1353,7 +1381,7 @@
- * queued or lose PENDING. Grabbing PENDING and queueing should
- * happen with IRQ disabled.
- */
- - WARN_ON_ONCE(!irqs_disabled());
- + WARN_ON_ONCE_NONRT(!irqs_disabled());
-
- debug_work_activate(work);
-
- @@ -1361,6 +1389,8 @@
- if (unlikely(wq->flags & __WQ_DRAINING) &&
- WARN_ON_ONCE(!is_chained_work(wq)))
- return;
- +
- + rcu_read_lock();
- retry:
- if (req_cpu == WORK_CPU_UNBOUND)
- cpu = raw_smp_processor_id();
- @@ -1417,10 +1447,8 @@
- /* pwq determined, queue */
- trace_workqueue_queue_work(req_cpu, pwq, work);
-
- - if (WARN_ON(!list_empty(&work->entry))) {
- - spin_unlock(&pwq->pool->lock);
- - return;
- - }
- + if (WARN_ON(!list_empty(&work->entry)))
- + goto out;
-
- pwq->nr_in_flight[pwq->work_color]++;
- work_flags = work_color_to_flags(pwq->work_color);
- @@ -1436,7 +1464,9 @@
-
- insert_work(pwq, work, worklist, work_flags);
-
- +out:
- spin_unlock(&pwq->pool->lock);
- + rcu_read_unlock();
- }
-
- /**
- @@ -1456,14 +1486,14 @@
- bool ret = false;
- unsigned long flags;
-
- - local_irq_save(flags);
- + local_lock_irqsave(pendingb_lock,flags);
-
- if (!test_and_set_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work))) {
- __queue_work(cpu, wq, work);
- ret = true;
- }
-
- - local_irq_restore(flags);
- + local_unlock_irqrestore(pendingb_lock, flags);
- return ret;
- }
- EXPORT_SYMBOL(queue_work_on);
- @@ -1530,14 +1560,14 @@
- unsigned long flags;
-
- /* read the comment in __queue_work() */
- - local_irq_save(flags);
- + local_lock_irqsave(pendingb_lock, flags);
-
- if (!test_and_set_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work))) {
- __queue_delayed_work(cpu, wq, dwork, delay);
- ret = true;
- }
-
- - local_irq_restore(flags);
- + local_unlock_irqrestore(pendingb_lock, flags);
- return ret;
- }
- EXPORT_SYMBOL(queue_delayed_work_on);
- @@ -1572,7 +1602,7 @@
-
- if (likely(ret >= 0)) {
- __queue_delayed_work(cpu, wq, dwork, delay);
- - local_irq_restore(flags);
- + local_unlock_irqrestore(pendingb_lock, flags);
- }
-
- /* -ENOENT from try_to_grab_pending() becomes %true */
- @@ -1605,7 +1635,9 @@
- worker->last_active = jiffies;
-
- /* idle_list is LIFO */
- + rt_lock_idle_list(pool);
- list_add(&worker->entry, &pool->idle_list);
- + rt_unlock_idle_list(pool);
-
- if (too_many_workers(pool) && !timer_pending(&pool->idle_timer))
- mod_timer(&pool->idle_timer, jiffies + IDLE_WORKER_TIMEOUT);
- @@ -1638,7 +1670,9 @@
- return;
- worker_clr_flags(worker, WORKER_IDLE);
- pool->nr_idle--;
- + rt_lock_idle_list(pool);
- list_del_init(&worker->entry);
- + rt_unlock_idle_list(pool);
- }
-
- static struct worker *alloc_worker(int node)
- @@ -1806,7 +1840,9 @@
- pool->nr_workers--;
- pool->nr_idle--;
-
- + rt_lock_idle_list(pool);
- list_del_init(&worker->entry);
- + rt_unlock_idle_list(pool);
- worker->flags |= WORKER_DIE;
- wake_up_process(worker->task);
- }
- @@ -2723,14 +2759,14 @@
-
- might_sleep();
-
- - local_irq_disable();
- + rcu_read_lock();
- pool = get_work_pool(work);
- if (!pool) {
- - local_irq_enable();
- + rcu_read_unlock();
- return false;
- }
-
- - spin_lock(&pool->lock);
- + spin_lock_irq(&pool->lock);
- /* see the comment in try_to_grab_pending() with the same code */
- pwq = get_work_pwq(work);
- if (pwq) {
- @@ -2757,10 +2793,11 @@
- else
- lock_map_acquire_read(&pwq->wq->lockdep_map);
- lock_map_release(&pwq->wq->lockdep_map);
- -
- + rcu_read_unlock();
- return true;
- already_gone:
- spin_unlock_irq(&pool->lock);
- + rcu_read_unlock();
- return false;
- }
-
- @@ -2847,7 +2884,7 @@
-
- /* tell other tasks trying to grab @work to back off */
- mark_work_canceling(work);
- - local_irq_restore(flags);
- + local_unlock_irqrestore(pendingb_lock, flags);
-
- flush_work(work);
- clear_work_data(work);
- @@ -2902,10 +2939,10 @@
- */
- bool flush_delayed_work(struct delayed_work *dwork)
- {
- - local_irq_disable();
- + local_lock_irq(pendingb_lock);
- if (del_timer_sync(&dwork->timer))
- __queue_work(dwork->cpu, dwork->wq, &dwork->work);
- - local_irq_enable();
- + local_unlock_irq(pendingb_lock);
- return flush_work(&dwork->work);
- }
- EXPORT_SYMBOL(flush_delayed_work);
- @@ -2940,7 +2977,7 @@
-
- set_work_pool_and_clear_pending(&dwork->work,
- get_work_pool_id(&dwork->work));
- - local_irq_restore(flags);
- + local_unlock_irqrestore(pendingb_lock, flags);
- return ret;
- }
- EXPORT_SYMBOL(cancel_delayed_work);
- @@ -3198,7 +3235,7 @@
- * put_unbound_pool - put a worker_pool
- * @pool: worker_pool to put
- *
- - * Put @pool. If its refcnt reaches zero, it gets destroyed in sched-RCU
- + * Put @pool. If its refcnt reaches zero, it gets destroyed in RCU
- * safe manner. get_unbound_pool() calls this function on its failure path
- * and this function should be able to release pools which went through,
- * successfully or not, init_worker_pool().
- @@ -3252,8 +3289,8 @@
- del_timer_sync(&pool->idle_timer);
- del_timer_sync(&pool->mayday_timer);
-
- - /* sched-RCU protected to allow dereferences from get_work_pool() */
- - call_rcu_sched(&pool->rcu, rcu_free_pool);
- + /* RCU protected to allow dereferences from get_work_pool() */
- + call_rcu(&pool->rcu, rcu_free_pool);
- }
-
- /**
- @@ -3358,14 +3395,14 @@
- put_unbound_pool(pool);
- mutex_unlock(&wq_pool_mutex);
-
- - call_rcu_sched(&pwq->rcu, rcu_free_pwq);
- + call_rcu(&pwq->rcu, rcu_free_pwq);
-
- /*
- * If we're the last pwq going away, @wq is already dead and no one
- * is gonna access it anymore. Schedule RCU free.
- */
- if (is_last)
- - call_rcu_sched(&wq->rcu, rcu_free_wq);
- + call_rcu(&wq->rcu, rcu_free_wq);
- }
-
- /**
- @@ -4003,7 +4040,7 @@
- * The base ref is never dropped on per-cpu pwqs. Directly
- * schedule RCU free.
- */
- - call_rcu_sched(&wq->rcu, rcu_free_wq);
- + call_rcu(&wq->rcu, rcu_free_wq);
- } else {
- /*
- * We're the sole accessor of @wq at this point. Directly
- @@ -4096,7 +4133,8 @@
- struct pool_workqueue *pwq;
- bool ret;
-
- - rcu_read_lock_sched();
- + rcu_read_lock();
- + preempt_disable();
-
- if (cpu == WORK_CPU_UNBOUND)
- cpu = smp_processor_id();
- @@ -4107,7 +4145,8 @@
- pwq = unbound_pwq_by_node(wq, cpu_to_node(cpu));
-
- ret = !list_empty(&pwq->delayed_works);
- - rcu_read_unlock_sched();
- + preempt_enable();
- + rcu_read_unlock();
-
- return ret;
- }
- @@ -4133,15 +4172,15 @@
- if (work_pending(work))
- ret |= WORK_BUSY_PENDING;
-
- - local_irq_save(flags);
- + rcu_read_lock();
- pool = get_work_pool(work);
- if (pool) {
- - spin_lock(&pool->lock);
- + spin_lock_irqsave(&pool->lock, flags);
- if (find_worker_executing_work(pool, work))
- ret |= WORK_BUSY_RUNNING;
- - spin_unlock(&pool->lock);
- + spin_unlock_irqrestore(&pool->lock, flags);
- }
- - local_irq_restore(flags);
- + rcu_read_unlock();
-
- return ret;
- }
- @@ -4330,7 +4369,7 @@
- unsigned long flags;
- int pi;
-
- - rcu_read_lock_sched();
- + rcu_read_lock();
-
- pr_info("Showing busy workqueues and worker pools:\n");
-
- @@ -4381,7 +4420,7 @@
- spin_unlock_irqrestore(&pool->lock, flags);
- }
-
- - rcu_read_unlock_sched();
- + rcu_read_unlock();
- }
-
- /*
- @@ -4742,16 +4781,16 @@
- * nr_active is monotonically decreasing. It's safe
- * to peek without lock.
- */
- - rcu_read_lock_sched();
- + rcu_read_lock();
- for_each_pwq(pwq, wq) {
- WARN_ON_ONCE(pwq->nr_active < 0);
- if (pwq->nr_active) {
- busy = true;
- - rcu_read_unlock_sched();
- + rcu_read_unlock();
- goto out_unlock;
- }
- }
- - rcu_read_unlock_sched();
- + rcu_read_unlock();
- }
- out_unlock:
- mutex_unlock(&wq_pool_mutex);
- @@ -4865,7 +4904,8 @@
- const char *delim = "";
- int node, written = 0;
-
- - rcu_read_lock_sched();
- + get_online_cpus();
- + rcu_read_lock();
- for_each_node(node) {
- written += scnprintf(buf + written, PAGE_SIZE - written,
- "%s%d:%d", delim, node,
- @@ -4873,7 +4913,8 @@
- delim = " ";
- }
- written += scnprintf(buf + written, PAGE_SIZE - written, "\n");
- - rcu_read_unlock_sched();
- + rcu_read_unlock();
- + put_online_cpus();
-
- return written;
- }
- diff -Nur linux-4.1.39.orig/kernel/workqueue_internal.h linux-4.1.39/kernel/workqueue_internal.h
- --- linux-4.1.39.orig/kernel/workqueue_internal.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/kernel/workqueue_internal.h 2017-04-18 17:56:30.645398372 +0200
- @@ -43,6 +43,7 @@
- unsigned long last_active; /* L: last active timestamp */
- unsigned int flags; /* X: flags */
- int id; /* I: worker id */
- + int sleeping; /* None */
-
- /*
- * Opaque string set with work_set_desc(). Printed out with task
- @@ -68,7 +69,7 @@
- * Scheduler hooks for concurrency managed workqueue. Only to be used from
- * sched/core.c and workqueue.c.
- */
- -void wq_worker_waking_up(struct task_struct *task, int cpu);
- -struct task_struct *wq_worker_sleeping(struct task_struct *task, int cpu);
- +void wq_worker_running(struct task_struct *task);
- +void wq_worker_sleeping(struct task_struct *task);
-
- #endif /* _KERNEL_WORKQUEUE_INTERNAL_H */
- diff -Nur linux-4.1.39.orig/lib/debugobjects.c linux-4.1.39/lib/debugobjects.c
- --- linux-4.1.39.orig/lib/debugobjects.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/lib/debugobjects.c 2017-04-18 17:56:30.645398372 +0200
- @@ -309,7 +309,10 @@
- struct debug_obj *obj;
- unsigned long flags;
-
- - fill_pool();
- +#ifdef CONFIG_PREEMPT_RT_FULL
- + if (preempt_count() == 0 && !irqs_disabled())
- +#endif
- + fill_pool();
-
- db = get_bucket((unsigned long) addr);
-
- diff -Nur linux-4.1.39.orig/lib/dump_stack.c linux-4.1.39/lib/dump_stack.c
- --- linux-4.1.39.orig/lib/dump_stack.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/lib/dump_stack.c 2017-04-18 17:56:30.645398372 +0200
- @@ -8,6 +8,7 @@
- #include <linux/sched.h>
- #include <linux/smp.h>
- #include <linux/atomic.h>
- +#include <linux/locallock.h>
-
- static void __dump_stack(void)
- {
- diff -Nur linux-4.1.39.orig/lib/idr.c linux-4.1.39/lib/idr.c
- --- linux-4.1.39.orig/lib/idr.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/lib/idr.c 2017-04-18 17:56:30.645398372 +0200
- @@ -30,6 +30,7 @@
- #include <linux/idr.h>
- #include <linux/spinlock.h>
- #include <linux/percpu.h>
- +#include <linux/locallock.h>
-
- #define MAX_IDR_SHIFT (sizeof(int) * 8 - 1)
- #define MAX_IDR_BIT (1U << MAX_IDR_SHIFT)
- @@ -366,6 +367,35 @@
- idr_mark_full(pa, id);
- }
-
- +#ifdef CONFIG_PREEMPT_RT_FULL
- +static DEFINE_LOCAL_IRQ_LOCK(idr_lock);
- +
- +static inline void idr_preload_lock(void)
- +{
- + local_lock(idr_lock);
- +}
- +
- +static inline void idr_preload_unlock(void)
- +{
- + local_unlock(idr_lock);
- +}
- +
- +void idr_preload_end(void)
- +{
- + idr_preload_unlock();
- +}
- +EXPORT_SYMBOL(idr_preload_end);
- +#else
- +static inline void idr_preload_lock(void)
- +{
- + preempt_disable();
- +}
- +
- +static inline void idr_preload_unlock(void)
- +{
- + preempt_enable();
- +}
- +#endif
-
- /**
- * idr_preload - preload for idr_alloc()
- @@ -401,7 +431,7 @@
- WARN_ON_ONCE(in_interrupt());
- might_sleep_if(gfp_mask & __GFP_WAIT);
-
- - preempt_disable();
- + idr_preload_lock();
-
- /*
- * idr_alloc() is likely to succeed w/o full idr_layer buffer and
- @@ -413,9 +443,9 @@
- while (__this_cpu_read(idr_preload_cnt) < MAX_IDR_FREE) {
- struct idr_layer *new;
-
- - preempt_enable();
- + idr_preload_unlock();
- new = kmem_cache_zalloc(idr_layer_cache, gfp_mask);
- - preempt_disable();
- + idr_preload_lock();
- if (!new)
- break;
-
- diff -Nur linux-4.1.39.orig/lib/Kconfig linux-4.1.39/lib/Kconfig
- --- linux-4.1.39.orig/lib/Kconfig 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/lib/Kconfig 2017-04-18 17:56:30.645398372 +0200
- @@ -391,6 +391,7 @@
-
- config CPUMASK_OFFSTACK
- bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
- + depends on !PREEMPT_RT_FULL
- help
- Use dynamic allocation for cpumask_var_t, instead of putting
- them on the stack. This is a bit more expensive, but avoids
- diff -Nur linux-4.1.39.orig/lib/locking-selftest.c linux-4.1.39/lib/locking-selftest.c
- --- linux-4.1.39.orig/lib/locking-selftest.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/lib/locking-selftest.c 2017-04-18 17:56:30.645398372 +0200
- @@ -590,6 +590,8 @@
- #include "locking-selftest-spin-hardirq.h"
- GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_spin)
-
- +#ifndef CONFIG_PREEMPT_RT_FULL
- +
- #include "locking-selftest-rlock-hardirq.h"
- GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_rlock)
-
- @@ -605,9 +607,12 @@
- #include "locking-selftest-wlock-softirq.h"
- GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_wlock)
-
- +#endif
- +
- #undef E1
- #undef E2
-
- +#ifndef CONFIG_PREEMPT_RT_FULL
- /*
- * Enabling hardirqs with a softirq-safe lock held:
- */
- @@ -640,6 +645,8 @@
- #undef E1
- #undef E2
-
- +#endif
- +
- /*
- * Enabling irqs with an irq-safe lock held:
- */
- @@ -663,6 +670,8 @@
- #include "locking-selftest-spin-hardirq.h"
- GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_spin)
-
- +#ifndef CONFIG_PREEMPT_RT_FULL
- +
- #include "locking-selftest-rlock-hardirq.h"
- GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_rlock)
-
- @@ -678,6 +687,8 @@
- #include "locking-selftest-wlock-softirq.h"
- GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_wlock)
-
- +#endif
- +
- #undef E1
- #undef E2
-
- @@ -709,6 +720,8 @@
- #include "locking-selftest-spin-hardirq.h"
- GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_spin)
-
- +#ifndef CONFIG_PREEMPT_RT_FULL
- +
- #include "locking-selftest-rlock-hardirq.h"
- GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_rlock)
-
- @@ -724,6 +737,8 @@
- #include "locking-selftest-wlock-softirq.h"
- GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_wlock)
-
- +#endif
- +
- #undef E1
- #undef E2
- #undef E3
- @@ -757,6 +772,8 @@
- #include "locking-selftest-spin-hardirq.h"
- GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_spin)
-
- +#ifndef CONFIG_PREEMPT_RT_FULL
- +
- #include "locking-selftest-rlock-hardirq.h"
- GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_rlock)
-
- @@ -772,10 +789,14 @@
- #include "locking-selftest-wlock-softirq.h"
- GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_wlock)
-
- +#endif
- +
- #undef E1
- #undef E2
- #undef E3
-
- +#ifndef CONFIG_PREEMPT_RT_FULL
- +
- /*
- * read-lock / write-lock irq inversion.
- *
- @@ -838,6 +859,10 @@
- #undef E2
- #undef E3
-
- +#endif
- +
- +#ifndef CONFIG_PREEMPT_RT_FULL
- +
- /*
- * read-lock / write-lock recursion that is actually safe.
- */
- @@ -876,6 +901,8 @@
- #undef E2
- #undef E3
-
- +#endif
- +
- /*
- * read-lock / write-lock recursion that is unsafe.
- */
- @@ -1858,6 +1885,7 @@
-
- printk(" --------------------------------------------------------------------------\n");
-
- +#ifndef CONFIG_PREEMPT_RT_FULL
- /*
- * irq-context testcases:
- */
- @@ -1870,6 +1898,28 @@
-
- DO_TESTCASE_6x2("irq read-recursion", irq_read_recursion);
- // DO_TESTCASE_6x2B("irq read-recursion #2", irq_read_recursion2);
- +#else
- + /* On -rt, we only do hardirq context test for raw spinlock */
- + DO_TESTCASE_1B("hard-irqs-on + irq-safe-A", irqsafe1_hard_spin, 12);
- + DO_TESTCASE_1B("hard-irqs-on + irq-safe-A", irqsafe1_hard_spin, 21);
- +
- + DO_TESTCASE_1B("hard-safe-A + irqs-on", irqsafe2B_hard_spin, 12);
- + DO_TESTCASE_1B("hard-safe-A + irqs-on", irqsafe2B_hard_spin, 21);
- +
- + DO_TESTCASE_1B("hard-safe-A + unsafe-B #1", irqsafe3_hard_spin, 123);
- + DO_TESTCASE_1B("hard-safe-A + unsafe-B #1", irqsafe3_hard_spin, 132);
- + DO_TESTCASE_1B("hard-safe-A + unsafe-B #1", irqsafe3_hard_spin, 213);
- + DO_TESTCASE_1B("hard-safe-A + unsafe-B #1", irqsafe3_hard_spin, 231);
- + DO_TESTCASE_1B("hard-safe-A + unsafe-B #1", irqsafe3_hard_spin, 312);
- + DO_TESTCASE_1B("hard-safe-A + unsafe-B #1", irqsafe3_hard_spin, 321);
- +
- + DO_TESTCASE_1B("hard-safe-A + unsafe-B #2", irqsafe4_hard_spin, 123);
- + DO_TESTCASE_1B("hard-safe-A + unsafe-B #2", irqsafe4_hard_spin, 132);
- + DO_TESTCASE_1B("hard-safe-A + unsafe-B #2", irqsafe4_hard_spin, 213);
- + DO_TESTCASE_1B("hard-safe-A + unsafe-B #2", irqsafe4_hard_spin, 231);
- + DO_TESTCASE_1B("hard-safe-A + unsafe-B #2", irqsafe4_hard_spin, 312);
- + DO_TESTCASE_1B("hard-safe-A + unsafe-B #2", irqsafe4_hard_spin, 321);
- +#endif
-
- ww_tests();
-
- diff -Nur linux-4.1.39.orig/lib/percpu_ida.c linux-4.1.39/lib/percpu_ida.c
- --- linux-4.1.39.orig/lib/percpu_ida.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/lib/percpu_ida.c 2017-04-18 17:56:30.645398372 +0200
- @@ -26,6 +26,9 @@
- #include <linux/string.h>
- #include <linux/spinlock.h>
- #include <linux/percpu_ida.h>
- +#include <linux/locallock.h>
- +
- +static DEFINE_LOCAL_IRQ_LOCK(irq_off_lock);
-
- struct percpu_ida_cpu {
- /*
- @@ -148,13 +151,13 @@
- unsigned long flags;
- int tag;
-
- - local_irq_save(flags);
- + local_lock_irqsave(irq_off_lock, flags);
- tags = this_cpu_ptr(pool->tag_cpu);
-
- /* Fastpath */
- tag = alloc_local_tag(tags);
- if (likely(tag >= 0)) {
- - local_irq_restore(flags);
- + local_unlock_irqrestore(irq_off_lock, flags);
- return tag;
- }
-
- @@ -173,6 +176,7 @@
-
- if (!tags->nr_free)
- alloc_global_tags(pool, tags);
- +
- if (!tags->nr_free)
- steal_tags(pool, tags);
-
- @@ -184,7 +188,7 @@
- }
-
- spin_unlock(&pool->lock);
- - local_irq_restore(flags);
- + local_unlock_irqrestore(irq_off_lock, flags);
-
- if (tag >= 0 || state == TASK_RUNNING)
- break;
- @@ -196,7 +200,7 @@
-
- schedule();
-
- - local_irq_save(flags);
- + local_lock_irqsave(irq_off_lock, flags);
- tags = this_cpu_ptr(pool->tag_cpu);
- }
- if (state != TASK_RUNNING)
- @@ -221,7 +225,7 @@
-
- BUG_ON(tag >= pool->nr_tags);
-
- - local_irq_save(flags);
- + local_lock_irqsave(irq_off_lock, flags);
- tags = this_cpu_ptr(pool->tag_cpu);
-
- spin_lock(&tags->lock);
- @@ -253,7 +257,7 @@
- spin_unlock(&pool->lock);
- }
-
- - local_irq_restore(flags);
- + local_unlock_irqrestore(irq_off_lock, flags);
- }
- EXPORT_SYMBOL_GPL(percpu_ida_free);
-
- @@ -345,7 +349,7 @@
- struct percpu_ida_cpu *remote;
- unsigned cpu, i, err = 0;
-
- - local_irq_save(flags);
- + local_lock_irqsave(irq_off_lock, flags);
- for_each_possible_cpu(cpu) {
- remote = per_cpu_ptr(pool->tag_cpu, cpu);
- spin_lock(&remote->lock);
- @@ -367,7 +371,7 @@
- }
- spin_unlock(&pool->lock);
- out:
- - local_irq_restore(flags);
- + local_unlock_irqrestore(irq_off_lock, flags);
- return err;
- }
- EXPORT_SYMBOL_GPL(percpu_ida_for_each_free);
- diff -Nur linux-4.1.39.orig/lib/radix-tree.c linux-4.1.39/lib/radix-tree.c
- --- linux-4.1.39.orig/lib/radix-tree.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/lib/radix-tree.c 2017-04-18 17:56:30.645398372 +0200
- @@ -34,6 +34,7 @@
- #include <linux/bitops.h>
- #include <linux/rcupdate.h>
- #include <linux/preempt_mask.h> /* in_interrupt() */
- +#include <linux/locallock.h>
-
-
- /*
- @@ -68,6 +69,7 @@
- struct radix_tree_node *nodes[RADIX_TREE_PRELOAD_SIZE];
- };
- static DEFINE_PER_CPU(struct radix_tree_preload, radix_tree_preloads) = { 0, };
- +static DEFINE_LOCAL_IRQ_LOCK(radix_tree_preloads_lock);
-
- static inline void *ptr_to_indirect(void *ptr)
- {
- @@ -195,12 +197,13 @@
- * succeed in getting a node here (and never reach
- * kmem_cache_alloc)
- */
- - rtp = this_cpu_ptr(&radix_tree_preloads);
- + rtp = &get_locked_var(radix_tree_preloads_lock, radix_tree_preloads);
- if (rtp->nr) {
- ret = rtp->nodes[rtp->nr - 1];
- rtp->nodes[rtp->nr - 1] = NULL;
- rtp->nr--;
- }
- + put_locked_var(radix_tree_preloads_lock, radix_tree_preloads);
- /*
- * Update the allocation stack trace as this is more useful
- * for debugging.
- @@ -255,14 +258,14 @@
- struct radix_tree_node *node;
- int ret = -ENOMEM;
-
- - preempt_disable();
- + local_lock(radix_tree_preloads_lock);
- rtp = this_cpu_ptr(&radix_tree_preloads);
- while (rtp->nr < ARRAY_SIZE(rtp->nodes)) {
- - preempt_enable();
- + local_unlock(radix_tree_preloads_lock);
- node = kmem_cache_alloc(radix_tree_node_cachep, gfp_mask);
- if (node == NULL)
- goto out;
- - preempt_disable();
- + local_lock(radix_tree_preloads_lock);
- rtp = this_cpu_ptr(&radix_tree_preloads);
- if (rtp->nr < ARRAY_SIZE(rtp->nodes))
- rtp->nodes[rtp->nr++] = node;
- @@ -301,11 +304,17 @@
- if (gfp_mask & __GFP_WAIT)
- return __radix_tree_preload(gfp_mask);
- /* Preloading doesn't help anything with this gfp mask, skip it */
- - preempt_disable();
- + local_lock(radix_tree_preloads_lock);
- return 0;
- }
- EXPORT_SYMBOL(radix_tree_maybe_preload);
-
- +void radix_tree_preload_end(void)
- +{
- + local_unlock(radix_tree_preloads_lock);
- +}
- +EXPORT_SYMBOL(radix_tree_preload_end);
- +
- /*
- * Return the maximum key which can be store into a
- * radix tree with height HEIGHT.
- diff -Nur linux-4.1.39.orig/lib/scatterlist.c linux-4.1.39/lib/scatterlist.c
- --- linux-4.1.39.orig/lib/scatterlist.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/lib/scatterlist.c 2017-04-18 17:56:30.645398372 +0200
- @@ -592,7 +592,7 @@
- flush_kernel_dcache_page(miter->page);
-
- if (miter->__flags & SG_MITER_ATOMIC) {
- - WARN_ON_ONCE(preemptible());
- + WARN_ON_ONCE(!pagefault_disabled());
- kunmap_atomic(miter->addr);
- } else
- kunmap(miter->page);
- @@ -637,7 +637,7 @@
- if (!sg_miter_skip(&miter, skip))
- return false;
-
- - local_irq_save(flags);
- + local_irq_save_nort(flags);
-
- while (sg_miter_next(&miter) && offset < buflen) {
- unsigned int len;
- @@ -654,7 +654,7 @@
-
- sg_miter_stop(&miter);
-
- - local_irq_restore(flags);
- + local_irq_restore_nort(flags);
- return offset;
- }
-
- diff -Nur linux-4.1.39.orig/lib/smp_processor_id.c linux-4.1.39/lib/smp_processor_id.c
- --- linux-4.1.39.orig/lib/smp_processor_id.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/lib/smp_processor_id.c 2017-04-18 17:56:30.645398372 +0200
- @@ -39,8 +39,9 @@
- if (!printk_ratelimit())
- goto out_enable;
-
- - printk(KERN_ERR "BUG: using %s%s() in preemptible [%08x] code: %s/%d\n",
- - what1, what2, preempt_count() - 1, current->comm, current->pid);
- + printk(KERN_ERR "BUG: using %s%s() in preemptible [%08x %08x] code: %s/%d\n",
- + what1, what2, preempt_count() - 1, __migrate_disabled(current),
- + current->comm, current->pid);
-
- print_symbol("caller is %s\n", (long)__builtin_return_address(0));
- dump_stack();
- diff -Nur linux-4.1.39.orig/lib/strnlen_user.c linux-4.1.39/lib/strnlen_user.c
- --- linux-4.1.39.orig/lib/strnlen_user.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/lib/strnlen_user.c 2017-04-18 17:56:30.649398527 +0200
- @@ -85,7 +85,8 @@
- * @str: The string to measure.
- * @count: Maximum count (including NUL character)
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * Get the size of a NUL-terminated string in user space.
- *
- @@ -121,7 +122,8 @@
- * strlen_user: - Get the size of a user string INCLUDING final NUL.
- * @str: The string to measure.
- *
- - * Context: User context only. This function may sleep.
- + * Context: User context only. This function may sleep if pagefaults are
- + * enabled.
- *
- * Get the size of a NUL-terminated string in user space.
- *
- diff -Nur linux-4.1.39.orig/Makefile linux-4.1.39/Makefile
- --- linux-4.1.39.orig/Makefile 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/Makefile 2017-04-18 17:56:30.545394493 +0200
- @@ -400,7 +400,7 @@
- KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
- -fno-strict-aliasing -fno-common \
- -Werror-implicit-function-declaration \
- - -Wno-format-security \
- + -Wno-format-security -fno-PIE \
- -std=gnu89
-
- KBUILD_AFLAGS_KERNEL :=
- diff -Nur linux-4.1.39.orig/mm/compaction.c linux-4.1.39/mm/compaction.c
- --- linux-4.1.39.orig/mm/compaction.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/mm/compaction.c 2017-04-18 17:56:30.649398527 +0200
- @@ -1423,10 +1423,12 @@
- cc->migrate_pfn & ~((1UL << cc->order) - 1);
-
- if (last_migrated_pfn < current_block_start) {
- - cpu = get_cpu();
- + cpu = get_cpu_light();
- + local_lock_irq(swapvec_lock);
- lru_add_drain_cpu(cpu);
- + local_unlock_irq(swapvec_lock);
- drain_local_pages(zone);
- - put_cpu();
- + put_cpu_light();
- /* No more flushing until we migrate again */
- last_migrated_pfn = 0;
- }
- diff -Nur linux-4.1.39.orig/mm/filemap.c linux-4.1.39/mm/filemap.c
- --- linux-4.1.39.orig/mm/filemap.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/mm/filemap.c 2017-04-18 17:56:30.649398527 +0200
- @@ -167,7 +167,9 @@
- if (!workingset_node_pages(node) &&
- list_empty(&node->private_list)) {
- node->private_data = mapping;
- - list_lru_add(&workingset_shadow_nodes, &node->private_list);
- + local_lock(workingset_shadow_lock);
- + list_lru_add(&__workingset_shadow_nodes, &node->private_list);
- + local_unlock(workingset_shadow_lock);
- }
- }
-
- @@ -533,9 +535,12 @@
- * node->private_list is protected by
- * mapping->tree_lock.
- */
- - if (!list_empty(&node->private_list))
- - list_lru_del(&workingset_shadow_nodes,
- + if (!list_empty(&node->private_list)) {
- + local_lock(workingset_shadow_lock);
- + list_lru_del(&__workingset_shadow_nodes,
- &node->private_list);
- + local_unlock(workingset_shadow_lock);
- + }
- }
- return 0;
- }
- diff -Nur linux-4.1.39.orig/mm/highmem.c linux-4.1.39/mm/highmem.c
- --- linux-4.1.39.orig/mm/highmem.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/mm/highmem.c 2017-04-18 17:56:30.649398527 +0200
- @@ -29,10 +29,11 @@
- #include <linux/kgdb.h>
- #include <asm/tlbflush.h>
-
- -
- +#ifndef CONFIG_PREEMPT_RT_FULL
- #if defined(CONFIG_HIGHMEM) || defined(CONFIG_X86_32)
- DEFINE_PER_CPU(int, __kmap_atomic_idx);
- #endif
- +#endif
-
- /*
- * Virtual_count is not a pure "count".
- @@ -107,8 +108,9 @@
- unsigned long totalhigh_pages __read_mostly;
- EXPORT_SYMBOL(totalhigh_pages);
-
- -
- +#ifndef CONFIG_PREEMPT_RT_FULL
- EXPORT_PER_CPU_SYMBOL(__kmap_atomic_idx);
- +#endif
-
- unsigned int nr_free_highpages (void)
- {
- diff -Nur linux-4.1.39.orig/mm/Kconfig linux-4.1.39/mm/Kconfig
- --- linux-4.1.39.orig/mm/Kconfig 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/mm/Kconfig 2017-04-18 17:56:30.649398527 +0200
- @@ -409,7 +409,7 @@
-
- config TRANSPARENT_HUGEPAGE
- bool "Transparent Hugepage Support"
- - depends on HAVE_ARCH_TRANSPARENT_HUGEPAGE
- + depends on HAVE_ARCH_TRANSPARENT_HUGEPAGE && !PREEMPT_RT_FULL
- select COMPACTION
- help
- Transparent Hugepages allows the kernel to use huge pages and
- diff -Nur linux-4.1.39.orig/mm/memcontrol.c linux-4.1.39/mm/memcontrol.c
- --- linux-4.1.39.orig/mm/memcontrol.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/mm/memcontrol.c 2017-04-18 17:56:30.649398527 +0200
- @@ -66,6 +66,8 @@
- #include <net/sock.h>
- #include <net/ip.h>
- #include <net/tcp_memcontrol.h>
- +#include <linux/locallock.h>
- +
- #include "slab.h"
-
- #include <asm/uaccess.h>
- @@ -85,6 +87,7 @@
- #define do_swap_account 0
- #endif
-
- +static DEFINE_LOCAL_IRQ_LOCK(event_lock);
- static const char * const mem_cgroup_stat_names[] = {
- "cache",
- "rss",
- @@ -2124,14 +2127,17 @@
- */
- static void refill_stock(struct mem_cgroup *memcg, unsigned int nr_pages)
- {
- - struct memcg_stock_pcp *stock = &get_cpu_var(memcg_stock);
- + struct memcg_stock_pcp *stock;
- + int cpu = get_cpu_light();
- +
- + stock = &per_cpu(memcg_stock, cpu);
-
- if (stock->cached != memcg) { /* reset if necessary */
- drain_stock(stock);
- stock->cached = memcg;
- }
- stock->nr_pages += nr_pages;
- - put_cpu_var(memcg_stock);
- + put_cpu_light();
- }
-
- /*
- @@ -2147,7 +2153,7 @@
- return;
- /* Notify other cpus that system-wide "drain" is running */
- get_online_cpus();
- - curcpu = get_cpu();
- + curcpu = get_cpu_light();
- for_each_online_cpu(cpu) {
- struct memcg_stock_pcp *stock = &per_cpu(memcg_stock, cpu);
- struct mem_cgroup *memcg;
- @@ -2164,7 +2170,7 @@
- schedule_work_on(cpu, &stock->work);
- }
- }
- - put_cpu();
- + put_cpu_light();
- put_online_cpus();
- mutex_unlock(&percpu_charge_mutex);
- }
- @@ -4803,12 +4809,12 @@
-
- ret = 0;
-
- - local_irq_disable();
- + local_lock_irq(event_lock);
- mem_cgroup_charge_statistics(to, page, nr_pages);
- memcg_check_events(to, page);
- mem_cgroup_charge_statistics(from, page, -nr_pages);
- memcg_check_events(from, page);
- - local_irq_enable();
- + local_unlock_irq(event_lock);
- out_unlock:
- unlock_page(page);
- out:
- @@ -5551,10 +5557,10 @@
- VM_BUG_ON_PAGE(!PageTransHuge(page), page);
- }
-
- - local_irq_disable();
- + local_lock_irq(event_lock);
- mem_cgroup_charge_statistics(memcg, page, nr_pages);
- memcg_check_events(memcg, page);
- - local_irq_enable();
- + local_unlock_irq(event_lock);
-
- if (do_swap_account && PageSwapCache(page)) {
- swp_entry_t entry = { .val = page_private(page) };
- @@ -5610,14 +5616,14 @@
- memcg_oom_recover(memcg);
- }
-
- - local_irq_save(flags);
- + local_lock_irqsave(event_lock, flags);
- __this_cpu_sub(memcg->stat->count[MEM_CGROUP_STAT_RSS], nr_anon);
- __this_cpu_sub(memcg->stat->count[MEM_CGROUP_STAT_CACHE], nr_file);
- __this_cpu_sub(memcg->stat->count[MEM_CGROUP_STAT_RSS_HUGE], nr_huge);
- __this_cpu_add(memcg->stat->events[MEM_CGROUP_EVENTS_PGPGOUT], pgpgout);
- __this_cpu_add(memcg->stat->nr_page_events, nr_pages);
- memcg_check_events(memcg, dummy_page);
- - local_irq_restore(flags);
- + local_unlock_irqrestore(event_lock, flags);
-
- if (!mem_cgroup_is_root(memcg))
- css_put_many(&memcg->css, nr_pages);
- @@ -5821,6 +5827,7 @@
- {
- struct mem_cgroup *memcg;
- unsigned short oldid;
- + unsigned long flags;
-
- VM_BUG_ON_PAGE(PageLRU(page), page);
- VM_BUG_ON_PAGE(page_count(page), page);
- @@ -5843,9 +5850,11 @@
- if (!mem_cgroup_is_root(memcg))
- page_counter_uncharge(&memcg->memory, 1);
-
- + local_lock_irqsave(event_lock, flags);
- /* Caller disabled preemption with mapping->tree_lock */
- mem_cgroup_charge_statistics(memcg, page, -1);
- memcg_check_events(memcg, page);
- + local_unlock_irqrestore(event_lock, flags);
- }
-
- /**
- diff -Nur linux-4.1.39.orig/mm/memory.c linux-4.1.39/mm/memory.c
- --- linux-4.1.39.orig/mm/memory.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/mm/memory.c 2017-04-18 17:56:30.649398527 +0200
- @@ -3753,7 +3753,7 @@
- }
-
- #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_DEBUG_ATOMIC_SLEEP)
- -void might_fault(void)
- +void __might_fault(const char *file, int line)
- {
- /*
- * Some code (nfs/sunrpc) uses socket ops on kernel memory while
- @@ -3763,21 +3763,15 @@
- */
- if (segment_eq(get_fs(), KERNEL_DS))
- return;
- -
- - /*
- - * it would be nicer only to annotate paths which are not under
- - * pagefault_disable, however that requires a larger audit and
- - * providing helpers like get_user_atomic.
- - */
- - if (in_atomic())
- + if (pagefault_disabled())
- return;
- -
- - __might_sleep(__FILE__, __LINE__, 0);
- -
- + __might_sleep(file, line, 0);
- +#if defined(CONFIG_DEBUG_ATOMIC_SLEEP)
- if (current->mm)
- might_lock_read(¤t->mm->mmap_sem);
- +#endif
- }
- -EXPORT_SYMBOL(might_fault);
- +EXPORT_SYMBOL(__might_fault);
- #endif
-
- #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS)
- diff -Nur linux-4.1.39.orig/mm/mmu_context.c linux-4.1.39/mm/mmu_context.c
- --- linux-4.1.39.orig/mm/mmu_context.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/mm/mmu_context.c 2017-04-18 17:56:30.649398527 +0200
- @@ -23,6 +23,7 @@
- struct task_struct *tsk = current;
-
- task_lock(tsk);
- + preempt_disable_rt();
- active_mm = tsk->active_mm;
- if (active_mm != mm) {
- atomic_inc(&mm->mm_count);
- @@ -30,6 +31,7 @@
- }
- tsk->mm = mm;
- switch_mm(active_mm, mm, tsk);
- + preempt_enable_rt();
- task_unlock(tsk);
- #ifdef finish_arch_post_lock_switch
- finish_arch_post_lock_switch();
- diff -Nur linux-4.1.39.orig/mm/page_alloc.c linux-4.1.39/mm/page_alloc.c
- --- linux-4.1.39.orig/mm/page_alloc.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/mm/page_alloc.c 2017-04-18 17:56:30.649398527 +0200
- @@ -60,6 +60,7 @@
- #include <linux/page_ext.h>
- #include <linux/hugetlb.h>
- #include <linux/sched/rt.h>
- +#include <linux/locallock.h>
- #include <linux/page_owner.h>
-
- #include <asm/sections.h>
- @@ -233,6 +234,18 @@
- EXPORT_SYMBOL(nr_online_nodes);
- #endif
-
- +static DEFINE_LOCAL_IRQ_LOCK(pa_lock);
- +
- +#ifdef CONFIG_PREEMPT_RT_BASE
- +# define cpu_lock_irqsave(cpu, flags) \
- + local_lock_irqsave_on(pa_lock, flags, cpu)
- +# define cpu_unlock_irqrestore(cpu, flags) \
- + local_unlock_irqrestore_on(pa_lock, flags, cpu)
- +#else
- +# define cpu_lock_irqsave(cpu, flags) local_irq_save(flags)
- +# define cpu_unlock_irqrestore(cpu, flags) local_irq_restore(flags)
- +#endif
- +
- int page_group_by_mobility_disabled __read_mostly;
-
- void set_pageblock_migratetype(struct page *page, int migratetype)
- @@ -701,7 +714,7 @@
- }
-
- /*
- - * Frees a number of pages from the PCP lists
- + * Frees a number of pages which have been collected from the pcp lists.
- * Assumes all pages on list are in same zone, and of same order.
- * count is the number of pages to free.
- *
- @@ -712,18 +725,51 @@
- * pinned" detection logic.
- */
- static void free_pcppages_bulk(struct zone *zone, int count,
- - struct per_cpu_pages *pcp)
- + struct list_head *list)
- {
- - int migratetype = 0;
- - int batch_free = 0;
- int to_free = count;
- unsigned long nr_scanned;
- + unsigned long flags;
- +
- + spin_lock_irqsave(&zone->lock, flags);
-
- - spin_lock(&zone->lock);
- nr_scanned = zone_page_state(zone, NR_PAGES_SCANNED);
- if (nr_scanned)
- __mod_zone_page_state(zone, NR_PAGES_SCANNED, -nr_scanned);
-
- + while (!list_empty(list)) {
- + struct page *page = list_first_entry(list, struct page, lru);
- + int mt; /* migratetype of the to-be-freed page */
- +
- + /* must delete as __free_one_page list manipulates */
- + list_del(&page->lru);
- +
- + mt = get_freepage_migratetype(page);
- + if (unlikely(has_isolate_pageblock(zone)))
- + mt = get_pageblock_migratetype(page);
- +
- + /* MIGRATE_MOVABLE list may include MIGRATE_RESERVEs */
- + __free_one_page(page, page_to_pfn(page), zone, 0, mt);
- + trace_mm_page_pcpu_drain(page, 0, mt);
- + to_free--;
- + }
- + WARN_ON(to_free != 0);
- + spin_unlock_irqrestore(&zone->lock, flags);
- +}
- +
- +/*
- + * Moves a number of pages from the PCP lists to free list which
- + * is freed outside of the locked region.
- + *
- + * Assumes all pages on list are in same zone, and of same order.
- + * count is the number of pages to free.
- + */
- +static void isolate_pcp_pages(int to_free, struct per_cpu_pages *src,
- + struct list_head *dst)
- +{
- + int migratetype = 0;
- + int batch_free = 0;
- +
- while (to_free) {
- struct page *page;
- struct list_head *list;
- @@ -739,7 +785,7 @@
- batch_free++;
- if (++migratetype == MIGRATE_PCPTYPES)
- migratetype = 0;
- - list = &pcp->lists[migratetype];
- + list = &src->lists[migratetype];
- } while (list_empty(list));
-
- /* This is the only non-empty list. Free them all. */
- @@ -747,21 +793,11 @@
- batch_free = to_free;
-
- do {
- - int mt; /* migratetype of the to-be-freed page */
- -
- - page = list_entry(list->prev, struct page, lru);
- - /* must delete as __free_one_page list manipulates */
- + page = list_last_entry(list, struct page, lru);
- list_del(&page->lru);
- - mt = get_freepage_migratetype(page);
- - if (unlikely(has_isolate_pageblock(zone)))
- - mt = get_pageblock_migratetype(page);
- -
- - /* MIGRATE_MOVABLE list may include MIGRATE_RESERVEs */
- - __free_one_page(page, page_to_pfn(page), zone, 0, mt);
- - trace_mm_page_pcpu_drain(page, 0, mt);
- + list_add(&page->lru, dst);
- } while (--to_free && --batch_free && !list_empty(list));
- }
- - spin_unlock(&zone->lock);
- }
-
- static void free_one_page(struct zone *zone,
- @@ -770,7 +806,9 @@
- int migratetype)
- {
- unsigned long nr_scanned;
- - spin_lock(&zone->lock);
- + unsigned long flags;
- +
- + spin_lock_irqsave(&zone->lock, flags);
- nr_scanned = zone_page_state(zone, NR_PAGES_SCANNED);
- if (nr_scanned)
- __mod_zone_page_state(zone, NR_PAGES_SCANNED, -nr_scanned);
- @@ -780,7 +818,7 @@
- migratetype = get_pfnblock_migratetype(page, pfn);
- }
- __free_one_page(page, pfn, zone, order, migratetype);
- - spin_unlock(&zone->lock);
- + spin_unlock_irqrestore(&zone->lock, flags);
- }
-
- static int free_tail_pages_check(struct page *head_page, struct page *page)
- @@ -845,11 +883,11 @@
- return;
-
- migratetype = get_pfnblock_migratetype(page, pfn);
- - local_irq_save(flags);
- + local_lock_irqsave(pa_lock, flags);
- __count_vm_events(PGFREE, 1 << order);
- set_freepage_migratetype(page, migratetype);
- free_one_page(page_zone(page), page, pfn, order, migratetype);
- - local_irq_restore(flags);
- + local_unlock_irqrestore(pa_lock, flags);
- }
-
- void __init __free_pages_bootmem(struct page *page, unsigned long pfn,
- @@ -1396,16 +1434,18 @@
- void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp)
- {
- unsigned long flags;
- + LIST_HEAD(dst);
- int to_drain, batch;
-
- - local_irq_save(flags);
- + local_lock_irqsave(pa_lock, flags);
- batch = READ_ONCE(pcp->batch);
- to_drain = min(pcp->count, batch);
- if (to_drain > 0) {
- - free_pcppages_bulk(zone, to_drain, pcp);
- + isolate_pcp_pages(to_drain, pcp, &dst);
- pcp->count -= to_drain;
- }
- - local_irq_restore(flags);
- + local_unlock_irqrestore(pa_lock, flags);
- + free_pcppages_bulk(zone, to_drain, &dst);
- }
- #endif
-
- @@ -1421,16 +1461,21 @@
- unsigned long flags;
- struct per_cpu_pageset *pset;
- struct per_cpu_pages *pcp;
- + LIST_HEAD(dst);
- + int count;
-
- - local_irq_save(flags);
- + cpu_lock_irqsave(cpu, flags);
- pset = per_cpu_ptr(zone->pageset, cpu);
-
- pcp = &pset->pcp;
- - if (pcp->count) {
- - free_pcppages_bulk(zone, pcp->count, pcp);
- + count = pcp->count;
- + if (count) {
- + isolate_pcp_pages(count, pcp, &dst);
- pcp->count = 0;
- }
- - local_irq_restore(flags);
- + cpu_unlock_irqrestore(cpu, flags);
- + if (count)
- + free_pcppages_bulk(zone, count, &dst);
- }
-
- /*
- @@ -1516,8 +1561,17 @@
- else
- cpumask_clear_cpu(cpu, &cpus_with_pcps);
- }
- +#ifndef CONFIG_PREEMPT_RT_BASE
- on_each_cpu_mask(&cpus_with_pcps, (smp_call_func_t) drain_local_pages,
- zone, 1);
- +#else
- + for_each_cpu(cpu, &cpus_with_pcps) {
- + if (zone)
- + drain_pages_zone(cpu, zone);
- + else
- + drain_pages(cpu);
- + }
- +#endif
- }
-
- #ifdef CONFIG_HIBERNATION
- @@ -1573,7 +1627,7 @@
-
- migratetype = get_pfnblock_migratetype(page, pfn);
- set_freepage_migratetype(page, migratetype);
- - local_irq_save(flags);
- + local_lock_irqsave(pa_lock, flags);
- __count_vm_event(PGFREE);
-
- /*
- @@ -1599,12 +1653,17 @@
- pcp->count++;
- if (pcp->count >= pcp->high) {
- unsigned long batch = READ_ONCE(pcp->batch);
- - free_pcppages_bulk(zone, batch, pcp);
- + LIST_HEAD(dst);
- +
- + isolate_pcp_pages(batch, pcp, &dst);
- pcp->count -= batch;
- + local_unlock_irqrestore(pa_lock, flags);
- + free_pcppages_bulk(zone, batch, &dst);
- + return;
- }
-
- out:
- - local_irq_restore(flags);
- + local_unlock_irqrestore(pa_lock, flags);
- }
-
- /*
- @@ -1735,7 +1794,7 @@
- struct per_cpu_pages *pcp;
- struct list_head *list;
-
- - local_irq_save(flags);
- + local_lock_irqsave(pa_lock, flags);
- pcp = &this_cpu_ptr(zone->pageset)->pcp;
- list = &pcp->lists[migratetype];
- if (list_empty(list)) {
- @@ -1767,13 +1826,15 @@
- */
- WARN_ON_ONCE(order > 1);
- }
- - spin_lock_irqsave(&zone->lock, flags);
- + local_spin_lock_irqsave(pa_lock, &zone->lock, flags);
- page = __rmqueue(zone, order, migratetype);
- - spin_unlock(&zone->lock);
- - if (!page)
- + if (!page) {
- + spin_unlock(&zone->lock);
- goto failed;
- + }
- __mod_zone_freepage_state(zone, -(1 << order),
- get_freepage_migratetype(page));
- + spin_unlock(&zone->lock);
- }
-
- __mod_zone_page_state(zone, NR_ALLOC_BATCH, -(1 << order));
- @@ -1783,13 +1844,13 @@
-
- __count_zone_vm_events(PGALLOC, zone, 1 << order);
- zone_statistics(preferred_zone, zone, gfp_flags);
- - local_irq_restore(flags);
- + local_unlock_irqrestore(pa_lock, flags);
-
- VM_BUG_ON_PAGE(bad_range(zone, page), page);
- return page;
-
- failed:
- - local_irq_restore(flags);
- + local_unlock_irqrestore(pa_lock, flags);
- return NULL;
- }
-
- @@ -5680,6 +5741,7 @@
- void __init page_alloc_init(void)
- {
- hotcpu_notifier(page_alloc_cpu_notify, 0);
- + local_irq_lock_init(pa_lock);
- }
-
- /*
- @@ -6575,7 +6637,7 @@
- struct per_cpu_pageset *pset;
-
- /* avoid races with drain_pages() */
- - local_irq_save(flags);
- + local_lock_irqsave(pa_lock, flags);
- if (zone->pageset != &boot_pageset) {
- for_each_online_cpu(cpu) {
- pset = per_cpu_ptr(zone->pageset, cpu);
- @@ -6584,7 +6646,7 @@
- free_percpu(zone->pageset);
- zone->pageset = &boot_pageset;
- }
- - local_irq_restore(flags);
- + local_unlock_irqrestore(pa_lock, flags);
- }
-
- #ifdef CONFIG_MEMORY_HOTREMOVE
- diff -Nur linux-4.1.39.orig/mm/percpu.c linux-4.1.39/mm/percpu.c
- --- linux-4.1.39.orig/mm/percpu.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/mm/percpu.c 2017-04-18 17:56:30.649398527 +0200
- @@ -1282,18 +1282,7 @@
- }
- EXPORT_SYMBOL_GPL(free_percpu);
-
- -/**
- - * is_kernel_percpu_address - test whether address is from static percpu area
- - * @addr: address to test
- - *
- - * Test whether @addr belongs to in-kernel static percpu area. Module
- - * static percpu areas are not considered. For those, use
- - * is_module_percpu_address().
- - *
- - * RETURNS:
- - * %true if @addr is from in-kernel static percpu area, %false otherwise.
- - */
- -bool is_kernel_percpu_address(unsigned long addr)
- +bool __is_kernel_percpu_address(unsigned long addr, unsigned long *can_addr)
- {
- #ifdef CONFIG_SMP
- const size_t static_size = __per_cpu_end - __per_cpu_start;
- @@ -1302,16 +1291,36 @@
-
- for_each_possible_cpu(cpu) {
- void *start = per_cpu_ptr(base, cpu);
- + void *va = (void *)addr;
-
- - if ((void *)addr >= start && (void *)addr < start + static_size)
- + if (va >= start && va < start + static_size) {
- + if (can_addr)
- + *can_addr = (unsigned long) (va - start);
- return true;
- - }
- + }
- + }
- #endif
- /* on UP, can't distinguish from other static vars, always false */
- return false;
- }
-
- /**
- + * is_kernel_percpu_address - test whether address is from static percpu area
- + * @addr: address to test
- + *
- + * Test whether @addr belongs to in-kernel static percpu area. Module
- + * static percpu areas are not considered. For those, use
- + * is_module_percpu_address().
- + *
- + * RETURNS:
- + * %true if @addr is from in-kernel static percpu area, %false otherwise.
- + */
- +bool is_kernel_percpu_address(unsigned long addr)
- +{
- + return __is_kernel_percpu_address(addr, NULL);
- +}
- +
- +/**
- * per_cpu_ptr_to_phys - convert translated percpu address to physical address
- * @addr: the address to be converted to physical address
- *
- diff -Nur linux-4.1.39.orig/mm/slab.h linux-4.1.39/mm/slab.h
- --- linux-4.1.39.orig/mm/slab.h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/mm/slab.h 2017-04-18 17:56:30.649398527 +0200
- @@ -330,7 +330,11 @@
- * The slab lists for all objects.
- */
- struct kmem_cache_node {
- +#ifdef CONFIG_SLUB
- + raw_spinlock_t list_lock;
- +#else
- spinlock_t list_lock;
- +#endif
-
- #ifdef CONFIG_SLAB
- struct list_head slabs_partial; /* partial list first, better asm code */
- diff -Nur linux-4.1.39.orig/mm/slub.c linux-4.1.39/mm/slub.c
- --- linux-4.1.39.orig/mm/slub.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/mm/slub.c 2017-04-18 17:56:30.653398681 +0200
- @@ -1069,7 +1069,7 @@
- {
- struct kmem_cache_node *n = get_node(s, page_to_nid(page));
-
- - spin_lock_irqsave(&n->list_lock, *flags);
- + raw_spin_lock_irqsave(&n->list_lock, *flags);
- slab_lock(page);
-
- if (!check_slab(s, page))
- @@ -1116,7 +1116,7 @@
-
- fail:
- slab_unlock(page);
- - spin_unlock_irqrestore(&n->list_lock, *flags);
- + raw_spin_unlock_irqrestore(&n->list_lock, *flags);
- slab_fix(s, "Object at 0x%p not freed", object);
- return NULL;
- }
- @@ -1242,6 +1242,12 @@
-
- #endif /* CONFIG_SLUB_DEBUG */
-
- +struct slub_free_list {
- + raw_spinlock_t lock;
- + struct list_head list;
- +};
- +static DEFINE_PER_CPU(struct slub_free_list, slub_free_list);
- +
- /*
- * Hooks for other subsystems that check memory allocations. In a typical
- * production configuration these hooks all should produce no code at all.
- @@ -1306,6 +1312,17 @@
- kasan_slab_free(s, x);
- }
-
- +static void setup_object(struct kmem_cache *s, struct page *page,
- + void *object)
- +{
- + setup_object_debug(s, page, object);
- + if (unlikely(s->ctor)) {
- + kasan_unpoison_object_data(s, object);
- + s->ctor(object);
- + kasan_poison_object_data(s, object);
- + }
- +}
- +
- /*
- * Slab allocation and freeing
- */
- @@ -1336,10 +1353,17 @@
- struct page *page;
- struct kmem_cache_order_objects oo = s->oo;
- gfp_t alloc_gfp;
- + void *start, *p;
- + int idx, order;
- + bool enableirqs;
-
- flags &= gfp_allowed_mask;
-
- - if (flags & __GFP_WAIT)
- + enableirqs = (flags & __GFP_WAIT) != 0;
- +#ifdef CONFIG_PREEMPT_RT_FULL
- + enableirqs |= system_state == SYSTEM_RUNNING;
- +#endif
- + if (enableirqs)
- local_irq_enable();
-
- flags |= s->allocflags;
- @@ -1359,13 +1383,13 @@
- * Try a lower order alloc if possible
- */
- page = alloc_slab_page(s, alloc_gfp, node, oo);
- -
- - if (page)
- - stat(s, ORDER_FALLBACK);
- + if (unlikely(!page))
- + goto out;
- + stat(s, ORDER_FALLBACK);
- }
-
- - if (kmemcheck_enabled && page
- - && !(s->flags & (SLAB_NOTRACK | DEBUG_DEFAULT_FLAGS))) {
- + if (kmemcheck_enabled &&
- + !(s->flags & (SLAB_NOTRACK | DEBUG_DEFAULT_FLAGS))) {
- int pages = 1 << oo_order(oo);
-
- kmemcheck_alloc_shadow(page, oo_order(oo), alloc_gfp, node);
- @@ -1380,51 +1404,9 @@
- kmemcheck_mark_unallocated_pages(page, pages);
- }
-
- - if (flags & __GFP_WAIT)
- - local_irq_disable();
- - if (!page)
- - return NULL;
- -
- page->objects = oo_objects(oo);
- - mod_zone_page_state(page_zone(page),
- - (s->flags & SLAB_RECLAIM_ACCOUNT) ?
- - NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE,
- - 1 << oo_order(oo));
- -
- - return page;
- -}
- -
- -static void setup_object(struct kmem_cache *s, struct page *page,
- - void *object)
- -{
- - setup_object_debug(s, page, object);
- - if (unlikely(s->ctor)) {
- - kasan_unpoison_object_data(s, object);
- - s->ctor(object);
- - kasan_poison_object_data(s, object);
- - }
- -}
- -
- -static struct page *new_slab(struct kmem_cache *s, gfp_t flags, int node)
- -{
- - struct page *page;
- - void *start;
- - void *p;
- - int order;
- - int idx;
- -
- - if (unlikely(flags & GFP_SLAB_BUG_MASK)) {
- - pr_emerg("gfp: %u\n", flags & GFP_SLAB_BUG_MASK);
- - BUG();
- - }
- -
- - page = allocate_slab(s,
- - flags & (GFP_RECLAIM_MASK | GFP_CONSTRAINT_MASK), node);
- - if (!page)
- - goto out;
-
- order = compound_order(page);
- - inc_slabs_node(s, page_to_nid(page), page->objects);
- page->slab_cache = s;
- __SetPageSlab(page);
- if (page_is_pfmemalloc(page))
- @@ -1448,10 +1430,34 @@
- page->freelist = start;
- page->inuse = page->objects;
- page->frozen = 1;
- +
- out:
- + if (enableirqs)
- + local_irq_disable();
- + if (!page)
- + return NULL;
- +
- + mod_zone_page_state(page_zone(page),
- + (s->flags & SLAB_RECLAIM_ACCOUNT) ?
- + NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE,
- + 1 << oo_order(oo));
- +
- + inc_slabs_node(s, page_to_nid(page), page->objects);
- +
- return page;
- }
-
- +static struct page *new_slab(struct kmem_cache *s, gfp_t flags, int node)
- +{
- + if (unlikely(flags & GFP_SLAB_BUG_MASK)) {
- + pr_emerg("gfp: %u\n", flags & GFP_SLAB_BUG_MASK);
- + BUG();
- + }
- +
- + return allocate_slab(s,
- + flags & (GFP_RECLAIM_MASK | GFP_CONSTRAINT_MASK), node);
- +}
- +
- static void __free_slab(struct kmem_cache *s, struct page *page)
- {
- int order = compound_order(page);
- @@ -1483,6 +1489,16 @@
- memcg_uncharge_slab(s, order);
- }
-
- +static void free_delayed(struct list_head *h)
- +{
- + while(!list_empty(h)) {
- + struct page *page = list_first_entry(h, struct page, lru);
- +
- + list_del(&page->lru);
- + __free_slab(page->slab_cache, page);
- + }
- +}
- +
- #define need_reserve_slab_rcu \
- (sizeof(((struct page *)NULL)->lru) < sizeof(struct rcu_head))
-
- @@ -1517,6 +1533,12 @@
- }
-
- call_rcu(head, rcu_free_slab);
- + } else if (irqs_disabled()) {
- + struct slub_free_list *f = this_cpu_ptr(&slub_free_list);
- +
- + raw_spin_lock(&f->lock);
- + list_add(&page->lru, &f->list);
- + raw_spin_unlock(&f->lock);
- } else
- __free_slab(s, page);
- }
- @@ -1630,7 +1652,7 @@
- if (!n || !n->nr_partial)
- return NULL;
-
- - spin_lock(&n->list_lock);
- + raw_spin_lock(&n->list_lock);
- list_for_each_entry_safe(page, page2, &n->partial, lru) {
- void *t;
-
- @@ -1655,7 +1677,7 @@
- break;
-
- }
- - spin_unlock(&n->list_lock);
- + raw_spin_unlock(&n->list_lock);
- return object;
- }
-
- @@ -1901,7 +1923,7 @@
- * that acquire_slab() will see a slab page that
- * is frozen
- */
- - spin_lock(&n->list_lock);
- + raw_spin_lock(&n->list_lock);
- }
- } else {
- m = M_FULL;
- @@ -1912,7 +1934,7 @@
- * slabs from diagnostic functions will not see
- * any frozen slabs.
- */
- - spin_lock(&n->list_lock);
- + raw_spin_lock(&n->list_lock);
- }
- }
-
- @@ -1947,7 +1969,7 @@
- goto redo;
-
- if (lock)
- - spin_unlock(&n->list_lock);
- + raw_spin_unlock(&n->list_lock);
-
- if (m == M_FREE) {
- stat(s, DEACTIVATE_EMPTY);
- @@ -1979,10 +2001,10 @@
- n2 = get_node(s, page_to_nid(page));
- if (n != n2) {
- if (n)
- - spin_unlock(&n->list_lock);
- + raw_spin_unlock(&n->list_lock);
-
- n = n2;
- - spin_lock(&n->list_lock);
- + raw_spin_lock(&n->list_lock);
- }
-
- do {
- @@ -2011,7 +2033,7 @@
- }
-
- if (n)
- - spin_unlock(&n->list_lock);
- + raw_spin_unlock(&n->list_lock);
-
- while (discard_page) {
- page = discard_page;
- @@ -2050,14 +2072,21 @@
- pobjects = oldpage->pobjects;
- pages = oldpage->pages;
- if (drain && pobjects > s->cpu_partial) {
- + struct slub_free_list *f;
- unsigned long flags;
- + LIST_HEAD(tofree);
- /*
- * partial array is full. Move the existing
- * set to the per node partial list.
- */
- local_irq_save(flags);
- unfreeze_partials(s, this_cpu_ptr(s->cpu_slab));
- + f = this_cpu_ptr(&slub_free_list);
- + raw_spin_lock(&f->lock);
- + list_splice_init(&f->list, &tofree);
- + raw_spin_unlock(&f->lock);
- local_irq_restore(flags);
- + free_delayed(&tofree);
- oldpage = NULL;
- pobjects = 0;
- pages = 0;
- @@ -2129,7 +2158,22 @@
-
- static void flush_all(struct kmem_cache *s)
- {
- + LIST_HEAD(tofree);
- + int cpu;
- +
- on_each_cpu_cond(has_cpu_slab, flush_cpu_slab, s, 1, GFP_ATOMIC);
- + for_each_online_cpu(cpu) {
- + struct slub_free_list *f;
- +
- + if (!has_cpu_slab(cpu, s))
- + continue;
- +
- + f = &per_cpu(slub_free_list, cpu);
- + raw_spin_lock_irq(&f->lock);
- + list_splice_init(&f->list, &tofree);
- + raw_spin_unlock_irq(&f->lock);
- + free_delayed(&tofree);
- + }
- }
-
- /*
- @@ -2165,10 +2209,10 @@
- unsigned long x = 0;
- struct page *page;
-
- - spin_lock_irqsave(&n->list_lock, flags);
- + raw_spin_lock_irqsave(&n->list_lock, flags);
- list_for_each_entry(page, &n->partial, lru)
- x += get_count(page);
- - spin_unlock_irqrestore(&n->list_lock, flags);
- + raw_spin_unlock_irqrestore(&n->list_lock, flags);
- return x;
- }
- #endif /* CONFIG_SLUB_DEBUG || CONFIG_SYSFS */
- @@ -2305,9 +2349,11 @@
- static void *__slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node,
- unsigned long addr, struct kmem_cache_cpu *c)
- {
- + struct slub_free_list *f;
- void *freelist;
- struct page *page;
- unsigned long flags;
- + LIST_HEAD(tofree);
-
- local_irq_save(flags);
- #ifdef CONFIG_PREEMPT
- @@ -2375,7 +2421,13 @@
- VM_BUG_ON(!c->page->frozen);
- c->freelist = get_freepointer(s, freelist);
- c->tid = next_tid(c->tid);
- +out:
- + f = this_cpu_ptr(&slub_free_list);
- + raw_spin_lock(&f->lock);
- + list_splice_init(&f->list, &tofree);
- + raw_spin_unlock(&f->lock);
- local_irq_restore(flags);
- + free_delayed(&tofree);
- return freelist;
-
- new_slab:
- @@ -2392,8 +2444,7 @@
-
- if (unlikely(!freelist)) {
- slab_out_of_memory(s, gfpflags, node);
- - local_irq_restore(flags);
- - return NULL;
- + goto out;
- }
-
- page = c->page;
- @@ -2408,8 +2459,7 @@
- deactivate_slab(s, page, get_freepointer(s, freelist));
- c->page = NULL;
- c->freelist = NULL;
- - local_irq_restore(flags);
- - return freelist;
- + goto out;
- }
-
- /*
- @@ -2593,7 +2643,7 @@
-
- do {
- if (unlikely(n)) {
- - spin_unlock_irqrestore(&n->list_lock, flags);
- + raw_spin_unlock_irqrestore(&n->list_lock, flags);
- n = NULL;
- }
- prior = page->freelist;
- @@ -2625,7 +2675,7 @@
- * Otherwise the list_lock will synchronize with
- * other processors updating the list of slabs.
- */
- - spin_lock_irqsave(&n->list_lock, flags);
- + raw_spin_lock_irqsave(&n->list_lock, flags);
-
- }
- }
- @@ -2667,7 +2717,7 @@
- add_partial(n, page, DEACTIVATE_TO_TAIL);
- stat(s, FREE_ADD_PARTIAL);
- }
- - spin_unlock_irqrestore(&n->list_lock, flags);
- + raw_spin_unlock_irqrestore(&n->list_lock, flags);
- return;
-
- slab_empty:
- @@ -2682,7 +2732,7 @@
- remove_full(s, n, page);
- }
-
- - spin_unlock_irqrestore(&n->list_lock, flags);
- + raw_spin_unlock_irqrestore(&n->list_lock, flags);
- stat(s, FREE_SLAB);
- discard_slab(s, page);
- }
- @@ -2881,7 +2931,7 @@
- init_kmem_cache_node(struct kmem_cache_node *n)
- {
- n->nr_partial = 0;
- - spin_lock_init(&n->list_lock);
- + raw_spin_lock_init(&n->list_lock);
- INIT_LIST_HEAD(&n->partial);
- #ifdef CONFIG_SLUB_DEBUG
- atomic_long_set(&n->nr_slabs, 0);
- @@ -3463,7 +3513,7 @@
- for (i = 0; i < SHRINK_PROMOTE_MAX; i++)
- INIT_LIST_HEAD(promote + i);
-
- - spin_lock_irqsave(&n->list_lock, flags);
- + raw_spin_lock_irqsave(&n->list_lock, flags);
-
- /*
- * Build lists of slabs to discard or promote.
- @@ -3494,7 +3544,7 @@
- for (i = SHRINK_PROMOTE_MAX - 1; i >= 0; i--)
- list_splice(promote + i, &n->partial);
-
- - spin_unlock_irqrestore(&n->list_lock, flags);
- + raw_spin_unlock_irqrestore(&n->list_lock, flags);
-
- /* Release empty slabs */
- list_for_each_entry_safe(page, t, &discard, lru)
- @@ -3670,6 +3720,12 @@
- {
- static __initdata struct kmem_cache boot_kmem_cache,
- boot_kmem_cache_node;
- + int cpu;
- +
- + for_each_possible_cpu(cpu) {
- + raw_spin_lock_init(&per_cpu(slub_free_list, cpu).lock);
- + INIT_LIST_HEAD(&per_cpu(slub_free_list, cpu).list);
- + }
-
- if (debug_guardpage_minorder())
- slub_max_order = 0;
- @@ -3912,7 +3968,7 @@
- struct page *page;
- unsigned long flags;
-
- - spin_lock_irqsave(&n->list_lock, flags);
- + raw_spin_lock_irqsave(&n->list_lock, flags);
-
- list_for_each_entry(page, &n->partial, lru) {
- validate_slab_slab(s, page, map);
- @@ -3934,7 +3990,7 @@
- s->name, count, atomic_long_read(&n->nr_slabs));
-
- out:
- - spin_unlock_irqrestore(&n->list_lock, flags);
- + raw_spin_unlock_irqrestore(&n->list_lock, flags);
- return count;
- }
-
- @@ -4122,12 +4178,12 @@
- if (!atomic_long_read(&n->nr_slabs))
- continue;
-
- - spin_lock_irqsave(&n->list_lock, flags);
- + raw_spin_lock_irqsave(&n->list_lock, flags);
- list_for_each_entry(page, &n->partial, lru)
- process_slab(&t, s, page, alloc, map);
- list_for_each_entry(page, &n->full, lru)
- process_slab(&t, s, page, alloc, map);
- - spin_unlock_irqrestore(&n->list_lock, flags);
- + raw_spin_unlock_irqrestore(&n->list_lock, flags);
- }
-
- for (i = 0; i < t.count; i++) {
- diff -Nur linux-4.1.39.orig/mm/swap.c linux-4.1.39/mm/swap.c
- --- linux-4.1.39.orig/mm/swap.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/mm/swap.c 2017-04-18 17:56:30.653398681 +0200
- @@ -32,6 +32,7 @@
- #include <linux/gfp.h>
- #include <linux/uio.h>
- #include <linux/hugetlb.h>
- +#include <linux/locallock.h>
-
- #include "internal.h"
-
- @@ -45,6 +46,9 @@
- static DEFINE_PER_CPU(struct pagevec, lru_rotate_pvecs);
- static DEFINE_PER_CPU(struct pagevec, lru_deactivate_file_pvecs);
-
- +static DEFINE_LOCAL_IRQ_LOCK(rotate_lock);
- +DEFINE_LOCAL_IRQ_LOCK(swapvec_lock);
- +
- /*
- * This path almost never happens for VM activity - pages are normally
- * freed via pagevecs. But it gets used by networking.
- @@ -481,11 +485,11 @@
- unsigned long flags;
-
- page_cache_get(page);
- - local_irq_save(flags);
- + local_lock_irqsave(rotate_lock, flags);
- pvec = this_cpu_ptr(&lru_rotate_pvecs);
- if (!pagevec_add(pvec, page) || PageCompound(page))
- pagevec_move_tail(pvec);
- - local_irq_restore(flags);
- + local_unlock_irqrestore(rotate_lock, flags);
- }
- }
-
- @@ -536,12 +540,13 @@
- void activate_page(struct page *page)
- {
- if (PageLRU(page) && !PageActive(page) && !PageUnevictable(page)) {
- - struct pagevec *pvec = &get_cpu_var(activate_page_pvecs);
- + struct pagevec *pvec = &get_locked_var(swapvec_lock,
- + activate_page_pvecs);
-
- page_cache_get(page);
- if (!pagevec_add(pvec, page) || PageCompound(page))
- pagevec_lru_move_fn(pvec, __activate_page, NULL);
- - put_cpu_var(activate_page_pvecs);
- + put_locked_var(swapvec_lock, activate_page_pvecs);
- }
- }
-
- @@ -567,7 +572,7 @@
-
- static void __lru_cache_activate_page(struct page *page)
- {
- - struct pagevec *pvec = &get_cpu_var(lru_add_pvec);
- + struct pagevec *pvec = &get_locked_var(swapvec_lock, lru_add_pvec);
- int i;
-
- /*
- @@ -589,7 +594,7 @@
- }
- }
-
- - put_cpu_var(lru_add_pvec);
- + put_locked_var(swapvec_lock, lru_add_pvec);
- }
-
- /*
- @@ -628,12 +633,12 @@
-
- static void __lru_cache_add(struct page *page)
- {
- - struct pagevec *pvec = &get_cpu_var(lru_add_pvec);
- + struct pagevec *pvec = &get_locked_var(swapvec_lock, lru_add_pvec);
-
- page_cache_get(page);
- if (!pagevec_add(pvec, page) || PageCompound(page))
- __pagevec_lru_add(pvec);
- - put_cpu_var(lru_add_pvec);
- + put_locked_var(swapvec_lock, lru_add_pvec);
- }
-
- /**
- @@ -813,9 +818,15 @@
- unsigned long flags;
-
- /* No harm done if a racing interrupt already did this */
- - local_irq_save(flags);
- +#ifdef CONFIG_PREEMPT_RT_BASE
- + local_lock_irqsave_on(rotate_lock, flags, cpu);
- + pagevec_move_tail(pvec);
- + local_unlock_irqrestore_on(rotate_lock, flags, cpu);
- +#else
- + local_lock_irqsave(rotate_lock, flags);
- pagevec_move_tail(pvec);
- - local_irq_restore(flags);
- + local_unlock_irqrestore(rotate_lock, flags);
- +#endif
- }
-
- pvec = &per_cpu(lru_deactivate_file_pvecs, cpu);
- @@ -843,26 +854,47 @@
- return;
-
- if (likely(get_page_unless_zero(page))) {
- - struct pagevec *pvec = &get_cpu_var(lru_deactivate_file_pvecs);
- + struct pagevec *pvec = &get_locked_var(swapvec_lock,
- + lru_deactivate_file_pvecs);
-
- if (!pagevec_add(pvec, page) || PageCompound(page))
- pagevec_lru_move_fn(pvec, lru_deactivate_file_fn, NULL);
- - put_cpu_var(lru_deactivate_file_pvecs);
- + put_locked_var(swapvec_lock, lru_deactivate_file_pvecs);
- }
- }
-
- void lru_add_drain(void)
- {
- - lru_add_drain_cpu(get_cpu());
- - put_cpu();
- + lru_add_drain_cpu(local_lock_cpu(swapvec_lock));
- + local_unlock_cpu(swapvec_lock);
- }
-
- +
- +#ifdef CONFIG_PREEMPT_RT_BASE
- +static inline void remote_lru_add_drain(int cpu, struct cpumask *has_work)
- +{
- + local_lock_on(swapvec_lock, cpu);
- + lru_add_drain_cpu(cpu);
- + local_unlock_on(swapvec_lock, cpu);
- +}
- +
- +#else
- +
- static void lru_add_drain_per_cpu(struct work_struct *dummy)
- {
- lru_add_drain();
- }
-
- static DEFINE_PER_CPU(struct work_struct, lru_add_drain_work);
- +static inline void remote_lru_add_drain(int cpu, struct cpumask *has_work)
- +{
- + struct work_struct *work = &per_cpu(lru_add_drain_work, cpu);
- +
- + INIT_WORK(work, lru_add_drain_per_cpu);
- + schedule_work_on(cpu, work);
- + cpumask_set_cpu(cpu, has_work);
- +}
- +#endif
-
- void lru_add_drain_all(void)
- {
- @@ -875,20 +907,17 @@
- cpumask_clear(&has_work);
-
- for_each_online_cpu(cpu) {
- - struct work_struct *work = &per_cpu(lru_add_drain_work, cpu);
- -
- if (pagevec_count(&per_cpu(lru_add_pvec, cpu)) ||
- pagevec_count(&per_cpu(lru_rotate_pvecs, cpu)) ||
- pagevec_count(&per_cpu(lru_deactivate_file_pvecs, cpu)) ||
- - need_activate_page_drain(cpu)) {
- - INIT_WORK(work, lru_add_drain_per_cpu);
- - schedule_work_on(cpu, work);
- - cpumask_set_cpu(cpu, &has_work);
- - }
- + need_activate_page_drain(cpu))
- + remote_lru_add_drain(cpu, &has_work);
- }
-
- +#ifndef CONFIG_PREEMPT_RT_BASE
- for_each_cpu(cpu, &has_work)
- flush_work(&per_cpu(lru_add_drain_work, cpu));
- +#endif
-
- put_online_cpus();
- mutex_unlock(&lock);
- diff -Nur linux-4.1.39.orig/mm/truncate.c linux-4.1.39/mm/truncate.c
- --- linux-4.1.39.orig/mm/truncate.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/mm/truncate.c 2017-04-18 17:56:30.653398681 +0200
- @@ -56,8 +56,11 @@
- * protected by mapping->tree_lock.
- */
- if (!workingset_node_shadows(node) &&
- - !list_empty(&node->private_list))
- - list_lru_del(&workingset_shadow_nodes, &node->private_list);
- + !list_empty(&node->private_list)) {
- + local_lock(workingset_shadow_lock);
- + list_lru_del(&__workingset_shadow_nodes, &node->private_list);
- + local_unlock(workingset_shadow_lock);
- + }
- __radix_tree_delete_node(&mapping->page_tree, node);
- unlock:
- spin_unlock_irq(&mapping->tree_lock);
- diff -Nur linux-4.1.39.orig/mm/vmalloc.c linux-4.1.39/mm/vmalloc.c
- --- linux-4.1.39.orig/mm/vmalloc.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/mm/vmalloc.c 2017-04-18 17:56:30.653398681 +0200
- @@ -819,7 +819,7 @@
- struct vmap_block *vb;
- struct vmap_area *va;
- unsigned long vb_idx;
- - int node, err;
- + int node, err, cpu;
- void *vaddr;
-
- node = numa_node_id();
- @@ -862,11 +862,12 @@
- BUG_ON(err);
- radix_tree_preload_end();
-
- - vbq = &get_cpu_var(vmap_block_queue);
- + cpu = get_cpu_light();
- + vbq = this_cpu_ptr(&vmap_block_queue);
- spin_lock(&vbq->lock);
- list_add_tail_rcu(&vb->free_list, &vbq->free);
- spin_unlock(&vbq->lock);
- - put_cpu_var(vmap_block_queue);
- + put_cpu_light();
-
- return vaddr;
- }
- @@ -935,6 +936,7 @@
- struct vmap_block *vb;
- void *vaddr = NULL;
- unsigned int order;
- + int cpu;
-
- BUG_ON(size & ~PAGE_MASK);
- BUG_ON(size > PAGE_SIZE*VMAP_MAX_ALLOC);
- @@ -949,7 +951,8 @@
- order = get_order(size);
-
- rcu_read_lock();
- - vbq = &get_cpu_var(vmap_block_queue);
- + cpu = get_cpu_light();
- + vbq = this_cpu_ptr(&vmap_block_queue);
- list_for_each_entry_rcu(vb, &vbq->free, free_list) {
- unsigned long pages_off;
-
- @@ -972,7 +975,7 @@
- break;
- }
-
- - put_cpu_var(vmap_block_queue);
- + put_cpu_light();
- rcu_read_unlock();
-
- /* Allocate new block if nothing was found */
- diff -Nur linux-4.1.39.orig/mm/vmstat.c linux-4.1.39/mm/vmstat.c
- --- linux-4.1.39.orig/mm/vmstat.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/mm/vmstat.c 2017-04-18 17:56:30.653398681 +0200
- @@ -226,6 +226,7 @@
- long x;
- long t;
-
- + preempt_disable_rt();
- x = delta + __this_cpu_read(*p);
-
- t = __this_cpu_read(pcp->stat_threshold);
- @@ -235,6 +236,7 @@
- x = 0;
- }
- __this_cpu_write(*p, x);
- + preempt_enable_rt();
- }
- EXPORT_SYMBOL(__mod_zone_page_state);
-
- @@ -267,6 +269,7 @@
- s8 __percpu *p = pcp->vm_stat_diff + item;
- s8 v, t;
-
- + preempt_disable_rt();
- v = __this_cpu_inc_return(*p);
- t = __this_cpu_read(pcp->stat_threshold);
- if (unlikely(v > t)) {
- @@ -275,6 +278,7 @@
- zone_page_state_add(v + overstep, zone, item);
- __this_cpu_write(*p, -overstep);
- }
- + preempt_enable_rt();
- }
-
- void __inc_zone_page_state(struct page *page, enum zone_stat_item item)
- @@ -289,6 +293,7 @@
- s8 __percpu *p = pcp->vm_stat_diff + item;
- s8 v, t;
-
- + preempt_disable_rt();
- v = __this_cpu_dec_return(*p);
- t = __this_cpu_read(pcp->stat_threshold);
- if (unlikely(v < - t)) {
- @@ -297,6 +302,7 @@
- zone_page_state_add(v - overstep, zone, item);
- __this_cpu_write(*p, overstep);
- }
- + preempt_enable_rt();
- }
-
- void __dec_zone_page_state(struct page *page, enum zone_stat_item item)
- diff -Nur linux-4.1.39.orig/mm/workingset.c linux-4.1.39/mm/workingset.c
- --- linux-4.1.39.orig/mm/workingset.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/mm/workingset.c 2017-04-18 17:56:30.653398681 +0200
- @@ -264,7 +264,8 @@
- * point where they would still be useful.
- */
-
- -struct list_lru workingset_shadow_nodes;
- +struct list_lru __workingset_shadow_nodes;
- +DEFINE_LOCAL_IRQ_LOCK(workingset_shadow_lock);
-
- static unsigned long count_shadow_nodes(struct shrinker *shrinker,
- struct shrink_control *sc)
- @@ -274,9 +275,9 @@
- unsigned long pages;
-
- /* list_lru lock nests inside IRQ-safe mapping->tree_lock */
- - local_irq_disable();
- - shadow_nodes = list_lru_shrink_count(&workingset_shadow_nodes, sc);
- - local_irq_enable();
- + local_lock_irq(workingset_shadow_lock);
- + shadow_nodes = list_lru_shrink_count(&__workingset_shadow_nodes, sc);
- + local_unlock_irq(workingset_shadow_lock);
-
- pages = node_present_pages(sc->nid);
- /*
- @@ -363,9 +364,9 @@
- spin_unlock(&mapping->tree_lock);
- ret = LRU_REMOVED_RETRY;
- out:
- - local_irq_enable();
- + local_unlock_irq(workingset_shadow_lock);
- cond_resched();
- - local_irq_disable();
- + local_lock_irq(workingset_shadow_lock);
- spin_lock(lru_lock);
- return ret;
- }
- @@ -376,10 +377,10 @@
- unsigned long ret;
-
- /* list_lru lock nests inside IRQ-safe mapping->tree_lock */
- - local_irq_disable();
- - ret = list_lru_shrink_walk(&workingset_shadow_nodes, sc,
- + local_lock_irq(workingset_shadow_lock);
- + ret = list_lru_shrink_walk(&__workingset_shadow_nodes, sc,
- shadow_lru_isolate, NULL);
- - local_irq_enable();
- + local_unlock_irq(workingset_shadow_lock);
- return ret;
- }
-
- @@ -400,7 +401,7 @@
- {
- int ret;
-
- - ret = list_lru_init_key(&workingset_shadow_nodes, &shadow_nodes_key);
- + ret = list_lru_init_key(&__workingset_shadow_nodes, &shadow_nodes_key);
- if (ret)
- goto err;
- ret = register_shrinker(&workingset_shadow_shrinker);
- @@ -408,7 +409,7 @@
- goto err_list_lru;
- return 0;
- err_list_lru:
- - list_lru_destroy(&workingset_shadow_nodes);
- + list_lru_destroy(&__workingset_shadow_nodes);
- err:
- return ret;
- }
- diff -Nur linux-4.1.39.orig/mm/zsmalloc.c linux-4.1.39/mm/zsmalloc.c
- --- linux-4.1.39.orig/mm/zsmalloc.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/mm/zsmalloc.c 2017-04-18 17:56:30.653398681 +0200
- @@ -68,6 +68,7 @@
- #include <linux/debugfs.h>
- #include <linux/zsmalloc.h>
- #include <linux/zpool.h>
- +#include <linux/locallock.h>
-
- /*
- * This must be power of 2 and greater than of equal to sizeof(link_free).
- @@ -398,6 +399,7 @@
-
- /* per-cpu VM mapping areas for zspage accesses that cross page boundaries */
- static DEFINE_PER_CPU(struct mapping_area, zs_map_area);
- +static DEFINE_LOCAL_IRQ_LOCK(zs_map_area_lock);
-
- static int is_first_page(struct page *page)
- {
- @@ -1289,7 +1291,7 @@
- class = pool->size_class[class_idx];
- off = obj_idx_to_offset(page, obj_idx, class->size);
-
- - area = &get_cpu_var(zs_map_area);
- + area = &get_locked_var(zs_map_area_lock, zs_map_area);
- area->vm_mm = mm;
- if (off + class->size <= PAGE_SIZE) {
- /* this object is contained entirely within a page */
- @@ -1342,7 +1344,7 @@
-
- __zs_unmap_object(area, pages, off, class->size);
- }
- - put_cpu_var(zs_map_area);
- + put_locked_var(zs_map_area_lock, zs_map_area);
- unpin_tag(handle);
- }
- EXPORT_SYMBOL_GPL(zs_unmap_object);
- diff -Nur linux-4.1.39.orig/net/core/dev.c linux-4.1.39/net/core/dev.c
- --- linux-4.1.39.orig/net/core/dev.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/net/core/dev.c 2017-04-18 17:56:30.653398681 +0200
- @@ -184,6 +184,7 @@
- static DEFINE_HASHTABLE(napi_hash, 8);
-
- static seqcount_t devnet_rename_seq;
- +static DEFINE_MUTEX(devnet_rename_mutex);
-
- static inline void dev_base_seq_inc(struct net *net)
- {
- @@ -205,14 +206,14 @@
- static inline void rps_lock(struct softnet_data *sd)
- {
- #ifdef CONFIG_RPS
- - spin_lock(&sd->input_pkt_queue.lock);
- + raw_spin_lock(&sd->input_pkt_queue.raw_lock);
- #endif
- }
-
- static inline void rps_unlock(struct softnet_data *sd)
- {
- #ifdef CONFIG_RPS
- - spin_unlock(&sd->input_pkt_queue.lock);
- + raw_spin_unlock(&sd->input_pkt_queue.raw_lock);
- #endif
- }
-
- @@ -852,7 +853,8 @@
- strcpy(name, dev->name);
- rcu_read_unlock();
- if (read_seqcount_retry(&devnet_rename_seq, seq)) {
- - cond_resched();
- + mutex_lock(&devnet_rename_mutex);
- + mutex_unlock(&devnet_rename_mutex);
- goto retry;
- }
-
- @@ -1121,20 +1123,17 @@
- if (dev->flags & IFF_UP)
- return -EBUSY;
-
- - write_seqcount_begin(&devnet_rename_seq);
- + mutex_lock(&devnet_rename_mutex);
- + __raw_write_seqcount_begin(&devnet_rename_seq);
-
- - if (strncmp(newname, dev->name, IFNAMSIZ) == 0) {
- - write_seqcount_end(&devnet_rename_seq);
- - return 0;
- - }
- + if (strncmp(newname, dev->name, IFNAMSIZ) == 0)
- + goto outunlock;
-
- memcpy(oldname, dev->name, IFNAMSIZ);
-
- err = dev_get_valid_name(net, dev, newname);
- - if (err < 0) {
- - write_seqcount_end(&devnet_rename_seq);
- - return err;
- - }
- + if (err < 0)
- + goto outunlock;
-
- if (oldname[0] && !strchr(oldname, '%'))
- netdev_info(dev, "renamed from %s\n", oldname);
- @@ -1147,11 +1146,12 @@
- if (ret) {
- memcpy(dev->name, oldname, IFNAMSIZ);
- dev->name_assign_type = old_assign_type;
- - write_seqcount_end(&devnet_rename_seq);
- - return ret;
- + err = ret;
- + goto outunlock;
- }
-
- - write_seqcount_end(&devnet_rename_seq);
- + __raw_write_seqcount_end(&devnet_rename_seq);
- + mutex_unlock(&devnet_rename_mutex);
-
- netdev_adjacent_rename_links(dev, oldname);
-
- @@ -1172,7 +1172,8 @@
- /* err >= 0 after dev_alloc_name() or stores the first errno */
- if (err >= 0) {
- err = ret;
- - write_seqcount_begin(&devnet_rename_seq);
- + mutex_lock(&devnet_rename_mutex);
- + __raw_write_seqcount_begin(&devnet_rename_seq);
- memcpy(dev->name, oldname, IFNAMSIZ);
- memcpy(oldname, newname, IFNAMSIZ);
- dev->name_assign_type = old_assign_type;
- @@ -1185,6 +1186,11 @@
- }
-
- return err;
- +
- +outunlock:
- + __raw_write_seqcount_end(&devnet_rename_seq);
- + mutex_unlock(&devnet_rename_mutex);
- + return err;
- }
-
- /**
- @@ -2214,6 +2220,7 @@
- sd->output_queue_tailp = &q->next_sched;
- raise_softirq_irqoff(NET_TX_SOFTIRQ);
- local_irq_restore(flags);
- + preempt_check_resched_rt();
- }
-
- void __netif_schedule(struct Qdisc *q)
- @@ -2295,6 +2302,7 @@
- __this_cpu_write(softnet_data.completion_queue, skb);
- raise_softirq_irqoff(NET_TX_SOFTIRQ);
- local_irq_restore(flags);
- + preempt_check_resched_rt();
- }
- EXPORT_SYMBOL(__dev_kfree_skb_irq);
-
- @@ -2820,7 +2828,11 @@
- * This permits __QDISC___STATE_RUNNING owner to get the lock more
- * often and dequeue packets faster.
- */
- +#ifdef CONFIG_PREEMPT_RT_FULL
- + contended = true;
- +#else
- contended = qdisc_is_running(q);
- +#endif
- if (unlikely(contended))
- spin_lock(&q->busylock);
-
- @@ -2880,9 +2892,44 @@
- #define skb_update_prio(skb)
- #endif
-
- +#ifdef CONFIG_PREEMPT_RT_FULL
- +
- +static inline int xmit_rec_read(void)
- +{
- + return current->xmit_recursion;
- +}
- +
- +static inline void xmit_rec_inc(void)
- +{
- + current->xmit_recursion++;
- +}
- +
- +static inline void xmit_rec_dec(void)
- +{
- + current->xmit_recursion--;
- +}
- +
- +#else
- +
- DEFINE_PER_CPU(int, xmit_recursion);
- EXPORT_SYMBOL(xmit_recursion);
-
- +static inline int xmit_rec_read(void)
- +{
- + return __this_cpu_read(xmit_recursion);
- +}
- +
- +static inline void xmit_rec_inc(void)
- +{
- + __this_cpu_inc(xmit_recursion);
- +}
- +
- +static inline int xmit_rec_dec(void)
- +{
- + __this_cpu_dec(xmit_recursion);
- +}
- +#endif
- +
- #define RECURSION_LIMIT 10
-
- /**
- @@ -2984,7 +3031,7 @@
-
- if (txq->xmit_lock_owner != cpu) {
-
- - if (__this_cpu_read(xmit_recursion) > RECURSION_LIMIT)
- + if (xmit_rec_read() > RECURSION_LIMIT)
- goto recursion_alert;
-
- skb = validate_xmit_skb(skb, dev);
- @@ -2994,9 +3041,9 @@
- HARD_TX_LOCK(dev, txq, cpu);
-
- if (!netif_xmit_stopped(txq)) {
- - __this_cpu_inc(xmit_recursion);
- + xmit_rec_inc();
- skb = dev_hard_start_xmit(skb, dev, txq, &rc);
- - __this_cpu_dec(xmit_recursion);
- + xmit_rec_dec();
- if (dev_xmit_complete(rc)) {
- HARD_TX_UNLOCK(dev, txq);
- goto out;
- @@ -3370,6 +3417,7 @@
- rps_unlock(sd);
-
- local_irq_restore(flags);
- + preempt_check_resched_rt();
-
- atomic_long_inc(&skb->dev->rx_dropped);
- kfree_skb(skb);
- @@ -3388,7 +3436,7 @@
- struct rps_dev_flow voidflow, *rflow = &voidflow;
- int cpu;
-
- - preempt_disable();
- + migrate_disable();
- rcu_read_lock();
-
- cpu = get_rps_cpu(skb->dev, skb, &rflow);
- @@ -3398,13 +3446,13 @@
- ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
-
- rcu_read_unlock();
- - preempt_enable();
- + migrate_enable();
- } else
- #endif
- {
- unsigned int qtail;
- - ret = enqueue_to_backlog(skb, get_cpu(), &qtail);
- - put_cpu();
- + ret = enqueue_to_backlog(skb, get_cpu_light(), &qtail);
- + put_cpu_light();
- }
- return ret;
- }
- @@ -3438,16 +3486,44 @@
-
- trace_netif_rx_ni_entry(skb);
-
- - preempt_disable();
- + local_bh_disable();
- err = netif_rx_internal(skb);
- - if (local_softirq_pending())
- - do_softirq();
- - preempt_enable();
- + local_bh_enable();
-
- return err;
- }
- EXPORT_SYMBOL(netif_rx_ni);
-
- +#ifdef CONFIG_PREEMPT_RT_FULL
- +/*
- + * RT runs ksoftirqd as a real time thread and the root_lock is a
- + * "sleeping spinlock". If the trylock fails then we can go into an
- + * infinite loop when ksoftirqd preempted the task which actually
- + * holds the lock, because we requeue q and raise NET_TX softirq
- + * causing ksoftirqd to loop forever.
- + *
- + * It's safe to use spin_lock on RT here as softirqs run in thread
- + * context and cannot deadlock against the thread which is holding
- + * root_lock.
- + *
- + * On !RT the trylock might fail, but there we bail out from the
- + * softirq loop after 10 attempts which we can't do on RT. And the
- + * task holding root_lock cannot be preempted, so the only downside of
- + * that trylock is that we need 10 loops to decide that we should have
- + * given up in the first one :)
- + */
- +static inline int take_root_lock(spinlock_t *lock)
- +{
- + spin_lock(lock);
- + return 1;
- +}
- +#else
- +static inline int take_root_lock(spinlock_t *lock)
- +{
- + return spin_trylock(lock);
- +}
- +#endif
- +
- static void net_tx_action(struct softirq_action *h)
- {
- struct softnet_data *sd = this_cpu_ptr(&softnet_data);
- @@ -3489,7 +3565,7 @@
- head = head->next_sched;
-
- root_lock = qdisc_lock(q);
- - if (spin_trylock(root_lock)) {
- + if (take_root_lock(root_lock)) {
- smp_mb__before_atomic();
- clear_bit(__QDISC_STATE_SCHED,
- &q->state);
- @@ -3886,7 +3962,7 @@
- skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) {
- if (skb->dev == dev) {
- __skb_unlink(skb, &sd->input_pkt_queue);
- - kfree_skb(skb);
- + __skb_queue_tail(&sd->tofree_queue, skb);
- input_queue_head_incr(sd);
- }
- }
- @@ -3895,10 +3971,13 @@
- skb_queue_walk_safe(&sd->process_queue, skb, tmp) {
- if (skb->dev == dev) {
- __skb_unlink(skb, &sd->process_queue);
- - kfree_skb(skb);
- + __skb_queue_tail(&sd->tofree_queue, skb);
- input_queue_head_incr(sd);
- }
- }
- +
- + if (!skb_queue_empty(&sd->tofree_queue))
- + raise_softirq_irqoff(NET_RX_SOFTIRQ);
- }
-
- static int napi_gro_complete(struct sk_buff *skb)
- @@ -4350,6 +4429,7 @@
- sd->rps_ipi_list = NULL;
-
- local_irq_enable();
- + preempt_check_resched_rt();
-
- /* Send pending IPI's to kick RPS processing on remote cpus. */
- while (remsd) {
- @@ -4363,6 +4443,7 @@
- } else
- #endif
- local_irq_enable();
- + preempt_check_resched_rt();
- }
-
- static bool sd_has_rps_ipi_waiting(struct softnet_data *sd)
- @@ -4444,9 +4525,11 @@
- local_irq_save(flags);
- ____napi_schedule(this_cpu_ptr(&softnet_data), n);
- local_irq_restore(flags);
- + preempt_check_resched_rt();
- }
- EXPORT_SYMBOL(__napi_schedule);
-
- +#ifndef CONFIG_PREEMPT_RT_FULL
- /**
- * __napi_schedule_irqoff - schedule for receive
- * @n: entry to schedule
- @@ -4458,6 +4541,7 @@
- ____napi_schedule(this_cpu_ptr(&softnet_data), n);
- }
- EXPORT_SYMBOL(__napi_schedule_irqoff);
- +#endif
-
- void __napi_complete(struct napi_struct *n)
- {
- @@ -4682,13 +4766,21 @@
- struct softnet_data *sd = this_cpu_ptr(&softnet_data);
- unsigned long time_limit = jiffies + 2;
- int budget = netdev_budget;
- + struct sk_buff_head tofree_q;
- + struct sk_buff *skb;
- LIST_HEAD(list);
- LIST_HEAD(repoll);
-
- + __skb_queue_head_init(&tofree_q);
- +
- local_irq_disable();
- + skb_queue_splice_init(&sd->tofree_queue, &tofree_q);
- list_splice_init(&sd->poll_list, &list);
- local_irq_enable();
-
- + while ((skb = __skb_dequeue(&tofree_q)))
- + kfree_skb(skb);
- +
- for (;;) {
- struct napi_struct *n;
-
- @@ -4718,7 +4810,7 @@
- list_splice_tail(&repoll, &list);
- list_splice(&list, &sd->poll_list);
- if (!list_empty(&sd->poll_list))
- - __raise_softirq_irqoff(NET_RX_SOFTIRQ);
- + __raise_softirq_irqoff_ksoft(NET_RX_SOFTIRQ);
-
- net_rps_action_and_irq_enable(sd);
- }
- @@ -6932,7 +7024,7 @@
- void synchronize_net(void)
- {
- might_sleep();
- - if (rtnl_is_locked())
- + if (rtnl_is_locked() && !IS_ENABLED(CONFIG_PREEMPT_RT_FULL))
- synchronize_rcu_expedited();
- else
- synchronize_rcu();
- @@ -7173,16 +7265,20 @@
-
- raise_softirq_irqoff(NET_TX_SOFTIRQ);
- local_irq_enable();
- + preempt_check_resched_rt();
-
- /* Process offline CPU's input_pkt_queue */
- while ((skb = __skb_dequeue(&oldsd->process_queue))) {
- netif_rx_ni(skb);
- input_queue_head_incr(oldsd);
- }
- - while ((skb = skb_dequeue(&oldsd->input_pkt_queue))) {
- + while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) {
- netif_rx_ni(skb);
- input_queue_head_incr(oldsd);
- }
- + while ((skb = __skb_dequeue(&oldsd->tofree_queue))) {
- + kfree_skb(skb);
- + }
-
- return NOTIFY_OK;
- }
- @@ -7484,8 +7580,9 @@
- for_each_possible_cpu(i) {
- struct softnet_data *sd = &per_cpu(softnet_data, i);
-
- - skb_queue_head_init(&sd->input_pkt_queue);
- - skb_queue_head_init(&sd->process_queue);
- + skb_queue_head_init_raw(&sd->input_pkt_queue);
- + skb_queue_head_init_raw(&sd->process_queue);
- + skb_queue_head_init_raw(&sd->tofree_queue);
- INIT_LIST_HEAD(&sd->poll_list);
- sd->output_queue_tailp = &sd->output_queue;
- #ifdef CONFIG_RPS
- diff -Nur linux-4.1.39.orig/net/core/skbuff.c linux-4.1.39/net/core/skbuff.c
- --- linux-4.1.39.orig/net/core/skbuff.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/net/core/skbuff.c 2017-04-18 17:56:30.657398836 +0200
- @@ -63,6 +63,7 @@
- #include <linux/errqueue.h>
- #include <linux/prefetch.h>
- #include <linux/if_vlan.h>
- +#include <linux/locallock.h>
-
- #include <net/protocol.h>
- #include <net/dst.h>
- @@ -358,6 +359,8 @@
- };
- static DEFINE_PER_CPU(struct netdev_alloc_cache, netdev_alloc_cache);
- static DEFINE_PER_CPU(struct netdev_alloc_cache, napi_alloc_cache);
- +static DEFINE_LOCAL_IRQ_LOCK(netdev_alloc_lock);
- +static DEFINE_LOCAL_IRQ_LOCK(napi_alloc_cache_lock);
-
- static struct page *__page_frag_refill(struct netdev_alloc_cache *nc,
- gfp_t gfp_mask)
- @@ -435,9 +438,9 @@
- unsigned long flags;
- void *data;
-
- - local_irq_save(flags);
- + local_lock_irqsave(netdev_alloc_lock, flags);
- data = __alloc_page_frag(&netdev_alloc_cache, fragsz, gfp_mask);
- - local_irq_restore(flags);
- + local_unlock_irqrestore(netdev_alloc_lock, flags);
- return data;
- }
-
- @@ -456,7 +459,12 @@
-
- static void *__napi_alloc_frag(unsigned int fragsz, gfp_t gfp_mask)
- {
- - return __alloc_page_frag(&napi_alloc_cache, fragsz, gfp_mask);
- + void *data;
- +
- + local_lock(napi_alloc_cache_lock);
- + data = __alloc_page_frag(&napi_alloc_cache, fragsz, gfp_mask);
- + local_unlock(napi_alloc_cache_lock);
- + return data;
- }
-
- void *napi_alloc_frag(unsigned int fragsz)
- diff -Nur linux-4.1.39.orig/net/core/sock.c linux-4.1.39/net/core/sock.c
- --- linux-4.1.39.orig/net/core/sock.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/net/core/sock.c 2017-04-18 17:56:30.657398836 +0200
- @@ -2369,12 +2369,11 @@
- if (sk->sk_lock.owned)
- __lock_sock(sk);
- sk->sk_lock.owned = 1;
- - spin_unlock(&sk->sk_lock.slock);
- + spin_unlock_bh(&sk->sk_lock.slock);
- /*
- * The sk_lock has mutex_lock() semantics here:
- */
- mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
- - local_bh_enable();
- }
- EXPORT_SYMBOL(lock_sock_nested);
-
- diff -Nur linux-4.1.39.orig/net/ipv4/icmp.c linux-4.1.39/net/ipv4/icmp.c
- --- linux-4.1.39.orig/net/ipv4/icmp.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/net/ipv4/icmp.c 2017-04-18 17:56:30.657398836 +0200
- @@ -69,6 +69,7 @@
- #include <linux/jiffies.h>
- #include <linux/kernel.h>
- #include <linux/fcntl.h>
- +#include <linux/sysrq.h>
- #include <linux/socket.h>
- #include <linux/in.h>
- #include <linux/inet.h>
- @@ -77,6 +78,7 @@
- #include <linux/string.h>
- #include <linux/netfilter_ipv4.h>
- #include <linux/slab.h>
- +#include <linux/locallock.h>
- #include <net/snmp.h>
- #include <net/ip.h>
- #include <net/route.h>
- @@ -203,6 +205,8 @@
- *
- * On SMP we have one ICMP socket per-cpu.
- */
- +static DEFINE_LOCAL_IRQ_LOCK(icmp_sk_lock);
- +
- static struct sock *icmp_sk(struct net *net)
- {
- return *this_cpu_ptr(net->ipv4.icmp_sk);
- @@ -214,12 +218,14 @@
-
- local_bh_disable();
-
- + local_lock(icmp_sk_lock);
- sk = icmp_sk(net);
-
- if (unlikely(!spin_trylock(&sk->sk_lock.slock))) {
- /* This can happen if the output path signals a
- * dst_link_failure() for an outgoing ICMP packet.
- */
- + local_unlock(icmp_sk_lock);
- local_bh_enable();
- return NULL;
- }
- @@ -229,6 +235,7 @@
- static inline void icmp_xmit_unlock(struct sock *sk)
- {
- spin_unlock_bh(&sk->sk_lock.slock);
- + local_unlock(icmp_sk_lock);
- }
-
- int sysctl_icmp_msgs_per_sec __read_mostly = 1000;
- @@ -356,6 +363,7 @@
- struct sock *sk;
- struct sk_buff *skb;
-
- + local_lock(icmp_sk_lock);
- sk = icmp_sk(dev_net((*rt)->dst.dev));
- if (ip_append_data(sk, fl4, icmp_glue_bits, icmp_param,
- icmp_param->data_len+icmp_param->head_len,
- @@ -378,6 +386,7 @@
- skb->ip_summed = CHECKSUM_NONE;
- ip_push_pending_frames(sk, fl4);
- }
- + local_unlock(icmp_sk_lock);
- }
-
- /*
- @@ -867,6 +876,30 @@
- }
-
- /*
- + * 32bit and 64bit have different timestamp length, so we check for
- + * the cookie at offset 20 and verify it is repeated at offset 50
- + */
- +#define CO_POS0 20
- +#define CO_POS1 50
- +#define CO_SIZE sizeof(int)
- +#define ICMP_SYSRQ_SIZE 57
- +
- +/*
- + * We got a ICMP_SYSRQ_SIZE sized ping request. Check for the cookie
- + * pattern and if it matches send the next byte as a trigger to sysrq.
- + */
- +static void icmp_check_sysrq(struct net *net, struct sk_buff *skb)
- +{
- + int cookie = htonl(net->ipv4.sysctl_icmp_echo_sysrq);
- + char *p = skb->data;
- +
- + if (!memcmp(&cookie, p + CO_POS0, CO_SIZE) &&
- + !memcmp(&cookie, p + CO_POS1, CO_SIZE) &&
- + p[CO_POS0 + CO_SIZE] == p[CO_POS1 + CO_SIZE])
- + handle_sysrq(p[CO_POS0 + CO_SIZE]);
- +}
- +
- +/*
- * Handle ICMP_ECHO ("ping") requests.
- *
- * RFC 1122: 3.2.2.6 MUST have an echo server that answers ICMP echo
- @@ -893,6 +926,11 @@
- icmp_param.data_len = skb->len;
- icmp_param.head_len = sizeof(struct icmphdr);
- icmp_reply(&icmp_param, skb);
- +
- + if (skb->len == ICMP_SYSRQ_SIZE &&
- + net->ipv4.sysctl_icmp_echo_sysrq) {
- + icmp_check_sysrq(net, skb);
- + }
- }
- /* should there be an ICMP stat for ignored echos? */
- return true;
- diff -Nur linux-4.1.39.orig/net/ipv4/sysctl_net_ipv4.c linux-4.1.39/net/ipv4/sysctl_net_ipv4.c
- --- linux-4.1.39.orig/net/ipv4/sysctl_net_ipv4.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/net/ipv4/sysctl_net_ipv4.c 2017-04-18 17:56:30.657398836 +0200
- @@ -779,6 +779,13 @@
- .proc_handler = proc_dointvec
- },
- {
- + .procname = "icmp_echo_sysrq",
- + .data = &init_net.ipv4.sysctl_icmp_echo_sysrq,
- + .maxlen = sizeof(int),
- + .mode = 0644,
- + .proc_handler = proc_dointvec
- + },
- + {
- .procname = "icmp_ignore_bogus_error_responses",
- .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
- .maxlen = sizeof(int),
- diff -Nur linux-4.1.39.orig/net/ipv4/tcp_ipv4.c linux-4.1.39/net/ipv4/tcp_ipv4.c
- --- linux-4.1.39.orig/net/ipv4/tcp_ipv4.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/net/ipv4/tcp_ipv4.c 2017-04-18 17:56:30.657398836 +0200
- @@ -62,6 +62,7 @@
- #include <linux/init.h>
- #include <linux/times.h>
- #include <linux/slab.h>
- +#include <linux/locallock.h>
-
- #include <net/net_namespace.h>
- #include <net/icmp.h>
- @@ -563,6 +564,7 @@
- }
- EXPORT_SYMBOL(tcp_v4_send_check);
-
- +static DEFINE_LOCAL_IRQ_LOCK(tcp_sk_lock);
- /*
- * This routine will send an RST to the other tcp.
- *
- @@ -684,10 +686,13 @@
- arg.bound_dev_if = sk->sk_bound_dev_if;
-
- arg.tos = ip_hdr(skb)->tos;
- +
- + local_lock(tcp_sk_lock);
- ip_send_unicast_reply(*this_cpu_ptr(net->ipv4.tcp_sk),
- skb, &TCP_SKB_CB(skb)->header.h4.opt,
- ip_hdr(skb)->saddr, ip_hdr(skb)->daddr,
- &arg, arg.iov[0].iov_len);
- + local_unlock(tcp_sk_lock);
-
- TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS);
- TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS);
- @@ -769,10 +774,12 @@
- if (oif)
- arg.bound_dev_if = oif;
- arg.tos = tos;
- + local_lock(tcp_sk_lock);
- ip_send_unicast_reply(*this_cpu_ptr(net->ipv4.tcp_sk),
- skb, &TCP_SKB_CB(skb)->header.h4.opt,
- ip_hdr(skb)->saddr, ip_hdr(skb)->daddr,
- &arg, arg.iov[0].iov_len);
- + local_unlock(tcp_sk_lock);
-
- TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS);
- }
- diff -Nur linux-4.1.39.orig/net/mac80211/rx.c linux-4.1.39/net/mac80211/rx.c
- --- linux-4.1.39.orig/net/mac80211/rx.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/net/mac80211/rx.c 2017-04-18 17:56:30.657398836 +0200
- @@ -3580,7 +3580,7 @@
- struct ieee80211_supported_band *sband;
- struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
-
- - WARN_ON_ONCE(softirq_count() == 0);
- + WARN_ON_ONCE_NONRT(softirq_count() == 0);
-
- if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
- goto drop;
- diff -Nur linux-4.1.39.orig/net/netfilter/core.c linux-4.1.39/net/netfilter/core.c
- --- linux-4.1.39.orig/net/netfilter/core.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/net/netfilter/core.c 2017-04-18 17:56:30.657398836 +0200
- @@ -22,11 +22,17 @@
- #include <linux/proc_fs.h>
- #include <linux/mutex.h>
- #include <linux/slab.h>
- +#include <linux/locallock.h>
- #include <net/net_namespace.h>
- #include <net/sock.h>
-
- #include "nf_internals.h"
-
- +#ifdef CONFIG_PREEMPT_RT_BASE
- +DEFINE_LOCAL_IRQ_LOCK(xt_write_lock);
- +EXPORT_PER_CPU_SYMBOL(xt_write_lock);
- +#endif
- +
- static DEFINE_MUTEX(afinfo_mutex);
-
- const struct nf_afinfo __rcu *nf_afinfo[NFPROTO_NUMPROTO] __read_mostly;
- diff -Nur linux-4.1.39.orig/net/packet/af_packet.c linux-4.1.39/net/packet/af_packet.c
- --- linux-4.1.39.orig/net/packet/af_packet.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/net/packet/af_packet.c 2017-04-18 17:56:30.657398836 +0200
- @@ -63,6 +63,7 @@
- #include <linux/if_packet.h>
- #include <linux/wireless.h>
- #include <linux/kernel.h>
- +#include <linux/delay.h>
- #include <linux/kmod.h>
- #include <linux/slab.h>
- #include <linux/vmalloc.h>
- @@ -698,7 +699,7 @@
- if (BLOCK_NUM_PKTS(pbd)) {
- while (atomic_read(&pkc->blk_fill_in_prog)) {
- /* Waiting for skb_copy_bits to finish... */
- - cpu_relax();
- + cpu_chill();
- }
- }
-
- @@ -960,7 +961,7 @@
- if (!(status & TP_STATUS_BLK_TMO)) {
- while (atomic_read(&pkc->blk_fill_in_prog)) {
- /* Waiting for skb_copy_bits to finish... */
- - cpu_relax();
- + cpu_chill();
- }
- }
- prb_close_block(pkc, pbd, po, status);
- diff -Nur linux-4.1.39.orig/net/rds/ib_rdma.c linux-4.1.39/net/rds/ib_rdma.c
- --- linux-4.1.39.orig/net/rds/ib_rdma.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/net/rds/ib_rdma.c 2017-04-18 17:56:30.657398836 +0200
- @@ -34,6 +34,7 @@
- #include <linux/slab.h>
- #include <linux/rculist.h>
- #include <linux/llist.h>
- +#include <linux/delay.h>
-
- #include "rds.h"
- #include "ib.h"
- @@ -286,7 +287,7 @@
- for_each_online_cpu(cpu) {
- flag = &per_cpu(clean_list_grace, cpu);
- while (test_bit(CLEAN_LIST_BUSY_BIT, flag))
- - cpu_relax();
- + cpu_chill();
- }
- }
-
- diff -Nur linux-4.1.39.orig/net/sched/sch_generic.c linux-4.1.39/net/sched/sch_generic.c
- --- linux-4.1.39.orig/net/sched/sch_generic.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/net/sched/sch_generic.c 2017-04-18 17:56:30.657398836 +0200
- @@ -899,7 +899,7 @@
- /* Wait for outstanding qdisc_run calls. */
- list_for_each_entry(dev, head, close_list)
- while (some_qdisc_is_busy(dev))
- - yield();
- + msleep(1);
- }
-
- void dev_deactivate(struct net_device *dev)
- diff -Nur linux-4.1.39.orig/net/sunrpc/svc_xprt.c linux-4.1.39/net/sunrpc/svc_xprt.c
- --- linux-4.1.39.orig/net/sunrpc/svc_xprt.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/net/sunrpc/svc_xprt.c 2017-04-18 17:56:30.657398836 +0200
- @@ -341,7 +341,7 @@
- goto out;
- }
-
- - cpu = get_cpu();
- + cpu = get_cpu_light();
- pool = svc_pool_for_cpu(xprt->xpt_server, cpu);
-
- atomic_long_inc(&pool->sp_stats.packets);
- @@ -377,7 +377,7 @@
-
- atomic_long_inc(&pool->sp_stats.threads_woken);
- wake_up_process(rqstp->rq_task);
- - put_cpu();
- + put_cpu_light();
- goto out;
- }
- rcu_read_unlock();
- @@ -398,7 +398,7 @@
- goto redo_search;
- }
- rqstp = NULL;
- - put_cpu();
- + put_cpu_light();
- out:
- trace_svc_xprt_do_enqueue(xprt, rqstp);
- }
- diff -Nur linux-4.1.39.orig/scripts/mkcompile_h linux-4.1.39/scripts/mkcompile_h
- --- linux-4.1.39.orig/scripts/mkcompile_h 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/scripts/mkcompile_h 2017-04-18 17:56:30.657398836 +0200
- @@ -4,7 +4,8 @@
- ARCH=$2
- SMP=$3
- PREEMPT=$4
- -CC=$5
- +RT=$5
- +CC=$6
-
- vecho() { [ "${quiet}" = "silent_" ] || echo "$@" ; }
-
- @@ -57,6 +58,7 @@
- CONFIG_FLAGS=""
- if [ -n "$SMP" ] ; then CONFIG_FLAGS="SMP"; fi
- if [ -n "$PREEMPT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT"; fi
- +if [ -n "$RT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS RT"; fi
- UTS_VERSION="$UTS_VERSION $CONFIG_FLAGS $TIMESTAMP"
-
- # Truncate to maximum length
- diff -Nur linux-4.1.39.orig/sound/core/pcm_native.c linux-4.1.39/sound/core/pcm_native.c
- --- linux-4.1.39.orig/sound/core/pcm_native.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/sound/core/pcm_native.c 2017-04-18 17:56:30.661398992 +0200
- @@ -135,7 +135,7 @@
- void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
- {
- if (!substream->pcm->nonatomic)
- - local_irq_disable();
- + local_irq_disable_nort();
- snd_pcm_stream_lock(substream);
- }
- EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq);
- @@ -150,7 +150,7 @@
- {
- snd_pcm_stream_unlock(substream);
- if (!substream->pcm->nonatomic)
- - local_irq_enable();
- + local_irq_enable_nort();
- }
- EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq);
-
- @@ -158,7 +158,7 @@
- {
- unsigned long flags = 0;
- if (!substream->pcm->nonatomic)
- - local_irq_save(flags);
- + local_irq_save_nort(flags);
- snd_pcm_stream_lock(substream);
- return flags;
- }
- @@ -176,7 +176,7 @@
- {
- snd_pcm_stream_unlock(substream);
- if (!substream->pcm->nonatomic)
- - local_irq_restore(flags);
- + local_irq_restore_nort(flags);
- }
- EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore);
-
- diff -Nur linux-4.1.39.orig/sound/soc/intel/atom/sst/sst.c linux-4.1.39/sound/soc/intel/atom/sst/sst.c
- --- linux-4.1.39.orig/sound/soc/intel/atom/sst/sst.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/sound/soc/intel/atom/sst/sst.c 2017-04-18 17:56:30.661398992 +0200
- @@ -368,8 +368,8 @@
- * initialize by FW or driver when firmware is loaded
- */
- spin_lock_irqsave(&ctx->ipc_spin_lock, irq_flags);
- - sst_shim_write64(shim, SST_IMRX, shim_regs->imrx),
- - sst_shim_write64(shim, SST_CSR, shim_regs->csr),
- + sst_shim_write64(shim, SST_IMRX, shim_regs->imrx);
- + sst_shim_write64(shim, SST_CSR, shim_regs->csr);
- spin_unlock_irqrestore(&ctx->ipc_spin_lock, irq_flags);
- }
-
- diff -Nur linux-4.1.39.orig/virt/kvm/async_pf.c linux-4.1.39/virt/kvm/async_pf.c
- --- linux-4.1.39.orig/virt/kvm/async_pf.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/virt/kvm/async_pf.c 2017-04-18 17:56:30.661398992 +0200
- @@ -94,8 +94,8 @@
-
- trace_kvm_async_pf_completed(addr, gva);
-
- - if (waitqueue_active(&vcpu->wq))
- - wake_up_interruptible(&vcpu->wq);
- + if (swaitqueue_active(&vcpu->wq))
- + swait_wake_interruptible(&vcpu->wq);
-
- mmput(mm);
- kvm_put_kvm(vcpu->kvm);
- diff -Nur linux-4.1.39.orig/virt/kvm/kvm_main.c linux-4.1.39/virt/kvm/kvm_main.c
- --- linux-4.1.39.orig/virt/kvm/kvm_main.c 2017-03-13 21:04:36.000000000 +0100
- +++ linux-4.1.39/virt/kvm/kvm_main.c 2017-04-18 17:56:30.661398992 +0200
- @@ -220,7 +220,7 @@
- vcpu->kvm = kvm;
- vcpu->vcpu_id = id;
- vcpu->pid = NULL;
- - init_waitqueue_head(&vcpu->wq);
- + init_swait_head(&vcpu->wq);
- kvm_async_pf_vcpu_init(vcpu);
-
- page = alloc_page(GFP_KERNEL | __GFP_ZERO);
- @@ -1782,7 +1782,7 @@
- void kvm_vcpu_block(struct kvm_vcpu *vcpu)
- {
- ktime_t start, cur;
- - DEFINE_WAIT(wait);
- + DEFINE_SWAITER(wait);
- bool waited = false;
-
- start = cur = ktime_get();
- @@ -1803,7 +1803,7 @@
- }
-
- for (;;) {
- - prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
- + swait_prepare(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
-
- if (kvm_vcpu_check_block(vcpu) < 0)
- break;
- @@ -1812,7 +1812,7 @@
- schedule();
- }
-
- - finish_wait(&vcpu->wq, &wait);
- + swait_finish(&vcpu->wq, &wait);
- cur = ktime_get();
-
- out:
- @@ -1828,11 +1828,11 @@
- {
- int me;
- int cpu = vcpu->cpu;
- - wait_queue_head_t *wqp;
- + struct swait_head *wqp;
-
- wqp = kvm_arch_vcpu_wq(vcpu);
- - if (waitqueue_active(wqp)) {
- - wake_up_interruptible(wqp);
- + if (swaitqueue_active(wqp)) {
- + swait_wake_interruptible(wqp);
- ++vcpu->stat.halt_wakeup;
- }
-
- @@ -1933,7 +1933,7 @@
- continue;
- if (vcpu == me)
- continue;
- - if (waitqueue_active(&vcpu->wq) && !kvm_arch_vcpu_runnable(vcpu))
- + if (swaitqueue_active(&vcpu->wq) && !kvm_arch_vcpu_runnable(vcpu))
- continue;
- if (!kvm_vcpu_eligible_for_directed_yield(vcpu))
- continue;
|
