linux: automatically mount devtmpfs for initramfs base systems

target/linux/patches/5.4.69/startup.patch

@@ -1,7 +1,20 @@
-diff -Nur linux-5.4.53.orig/init/main.c linux-5.4.53/init/main.c
---- linux-5.4.53.orig/init/main.c	2020-07-22 09:33:18.000000000 +0200
-+++ linux-5.4.53/init/main.c	2020-07-28 17:33:28.000000000 +0200
-@@ -1196,6 +1196,8 @@
+diff -Nur linux-5.4.69.orig/init/initramfs.c linux-5.4.69/init/initramfs.c
+--- linux-5.4.69.orig/init/initramfs.c	2020-10-01 13:19:27.000000000 +0200
++++ linux-5.4.69/init/initramfs.c	2020-10-31 02:34:40.814412219 +0100
+@@ -674,6 +674,9 @@
+ 	initrd_start = 0;
+ 	initrd_end = 0;
+ 
++#ifdef CONFIG_DEVTMPFS_MOUNT
++	devtmpfs_mount("dev");
++#endif
+ 	flush_delayed_fput();
+ 	return 0;
+ }
+diff -Nur linux-5.4.69.orig/init/main.c linux-5.4.69/init/main.c
+--- linux-5.4.69.orig/init/main.c	2020-10-01 13:19:27.000000000 +0200
++++ linux-5.4.69/init/main.c	2020-10-31 02:32:35.699678836 +0100
+@@ -1198,6 +1198,8 @@
  	if (ksys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0)
  		pr_err("Warning: unable to open an initial console.\n");
  
@@ -10,7 +23,7 @@ diff -Nur linux-5.4.53.orig/init/main.c linux-5.4.53/init/main.c
  	(void) ksys_dup(0);
  	(void) ksys_dup(0);
  	/*
-@@ -1204,7 +1206,7 @@
+@@ -1206,7 +1208,7 @@
  	 */
  
  	if (!ramdisk_execute_command)
@@ -19,3 +32,1234 @@ diff -Nur linux-5.4.53.orig/init/main.c linux-5.4.53/init/main.c
  
  	if (ksys_access((const char __user *)
  			ramdisk_execute_command, 0) != 0) {
+diff -Nur linux-5.4.69.orig/init/main.c.orig linux-5.4.69/init/main.c.orig
+--- linux-5.4.69.orig/init/main.c.orig	1970-01-01 01:00:00.000000000 +0100
++++ linux-5.4.69/init/main.c.orig	2020-10-01 13:19:27.000000000 +0200
+@@ -0,0 +1,1227 @@
++// SPDX-License-Identifier: GPL-2.0-only
++/*
++ *  linux/init/main.c
++ *
++ *  Copyright (C) 1991, 1992  Linus Torvalds
++ *
++ *  GK 2/5/95  -  Changed to support mounting root fs via NFS
++ *  Added initrd & change_root: Werner Almesberger & Hans Lermen, Feb '96
++ *  Moan early if gcc is old, avoiding bogus kernels - Paul Gortmaker, May '96
++ *  Simplified starting of init:  Michael A. Griffith <grif@acm.org>
++ */
++
++#define DEBUG		/* Enable initcall_debug */
++
++#include <linux/types.h>
++#include <linux/extable.h>
++#include <linux/module.h>
++#include <linux/proc_fs.h>
++#include <linux/binfmts.h>
++#include <linux/kernel.h>
++#include <linux/syscalls.h>
++#include <linux/stackprotector.h>
++#include <linux/string.h>
++#include <linux/ctype.h>
++#include <linux/delay.h>
++#include <linux/ioport.h>
++#include <linux/init.h>
++#include <linux/initrd.h>
++#include <linux/memblock.h>
++#include <linux/acpi.h>
++#include <linux/console.h>
++#include <linux/nmi.h>
++#include <linux/percpu.h>
++#include <linux/kmod.h>
++#include <linux/kprobes.h>
++#include <linux/vmalloc.h>
++#include <linux/kernel_stat.h>
++#include <linux/start_kernel.h>
++#include <linux/security.h>
++#include <linux/smp.h>
++#include <linux/profile.h>
++#include <linux/rcupdate.h>
++#include <linux/moduleparam.h>
++#include <linux/kallsyms.h>
++#include <linux/writeback.h>
++#include <linux/cpu.h>
++#include <linux/cpuset.h>
++#include <linux/cgroup.h>
++#include <linux/efi.h>
++#include <linux/tick.h>
++#include <linux/sched/isolation.h>
++#include <linux/interrupt.h>
++#include <linux/taskstats_kern.h>
++#include <linux/delayacct.h>
++#include <linux/unistd.h>
++#include <linux/utsname.h>
++#include <linux/rmap.h>
++#include <linux/mempolicy.h>
++#include <linux/key.h>
++#include <linux/buffer_head.h>
++#include <linux/page_ext.h>
++#include <linux/debug_locks.h>
++#include <linux/debugobjects.h>
++#include <linux/lockdep.h>
++#include <linux/kmemleak.h>
++#include <linux/pid_namespace.h>
++#include <linux/device.h>
++#include <linux/kthread.h>
++#include <linux/sched.h>
++#include <linux/sched/init.h>
++#include <linux/signal.h>
++#include <linux/idr.h>
++#include <linux/kgdb.h>
++#include <linux/ftrace.h>
++#include <linux/async.h>
++#include <linux/sfi.h>
++#include <linux/shmem_fs.h>
++#include <linux/slab.h>
++#include <linux/perf_event.h>
++#include <linux/ptrace.h>
++#include <linux/pti.h>
++#include <linux/blkdev.h>
++#include <linux/elevator.h>
++#include <linux/sched/clock.h>
++#include <linux/sched/task.h>
++#include <linux/sched/task_stack.h>
++#include <linux/context_tracking.h>
++#include <linux/random.h>
++#include <linux/list.h>
++#include <linux/integrity.h>
++#include <linux/proc_ns.h>
++#include <linux/io.h>
++#include <linux/cache.h>
++#include <linux/rodata_test.h>
++#include <linux/jump_label.h>
++#include <linux/mem_encrypt.h>
++
++#include <asm/io.h>
++#include <asm/bugs.h>
++#include <asm/setup.h>
++#include <asm/sections.h>
++#include <asm/cacheflush.h>
++
++#define CREATE_TRACE_POINTS
++#include <trace/events/initcall.h>
++
++static int kernel_init(void *);
++
++extern void init_IRQ(void);
++extern void radix_tree_init(void);
++
++/*
++ * Debug helper: via this flag we know that we are in 'early bootup code'
++ * where only the boot processor is running with IRQ disabled.  This means
++ * two things - IRQ must not be enabled before the flag is cleared and some
++ * operations which are not allowed with IRQ disabled are allowed while the
++ * flag is set.
++ */
++bool early_boot_irqs_disabled __read_mostly;
++
++enum system_states system_state __read_mostly;
++EXPORT_SYMBOL(system_state);
++
++/*
++ * Boot command-line arguments
++ */
++#define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT
++#define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT
++
++extern void time_init(void);
++/* Default late time init is NULL. archs can override this later. */
++void (*__initdata late_time_init)(void);
++
++/* Untouched command line saved by arch-specific code. */
++char __initdata boot_command_line[COMMAND_LINE_SIZE];
++/* Untouched saved command line (eg. for /proc) */
++char *saved_command_line;
++/* Command line for parameter parsing */
++static char *static_command_line;
++/* Command line for per-initcall parameter parsing */
++static char *initcall_command_line;
++
++static char *execute_command;
++static char *ramdisk_execute_command;
++
++/*
++ * Used to generate warnings if static_key manipulation functions are used
++ * before jump_label_init is called.
++ */
++bool static_key_initialized __read_mostly;
++EXPORT_SYMBOL_GPL(static_key_initialized);
++
++/*
++ * If set, this is an indication to the drivers that reset the underlying
++ * device before going ahead with the initialization otherwise driver might
++ * rely on the BIOS and skip the reset operation.
++ *
++ * This is useful if kernel is booting in an unreliable environment.
++ * For ex. kdump situation where previous kernel has crashed, BIOS has been
++ * skipped and devices will be in unknown state.
++ */
++unsigned int reset_devices;
++EXPORT_SYMBOL(reset_devices);
++
++static int __init set_reset_devices(char *str)
++{
++	reset_devices = 1;
++	return 1;
++}
++
++__setup("reset_devices", set_reset_devices);
++
++static const char *argv_init[MAX_INIT_ARGS+2] = { "init", NULL, };
++const char *envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, };
++static const char *panic_later, *panic_param;
++
++extern const struct obs_kernel_param __setup_start[], __setup_end[];
++
++static bool __init obsolete_checksetup(char *line)
++{
++	const struct obs_kernel_param *p;
++	bool had_early_param = false;
++
++	p = __setup_start;
++	do {
++		int n = strlen(p->str);
++		if (parameqn(line, p->str, n)) {
++			if (p->early) {
++				/* Already done in parse_early_param?
++				 * (Needs exact match on param part).
++				 * Keep iterating, as we can have early
++				 * params and __setups of same names 8( */
++				if (line[n] == '\0' || line[n] == '=')
++					had_early_param = true;
++			} else if (!p->setup_func) {
++				pr_warn("Parameter %s is obsolete, ignored\n",
++					p->str);
++				return true;
++			} else if (p->setup_func(line + n))
++				return true;
++		}
++		p++;
++	} while (p < __setup_end);
++
++	return had_early_param;
++}
++
++/*
++ * This should be approx 2 Bo*oMips to start (note initial shift), and will
++ * still work even if initially too large, it will just take slightly longer
++ */
++unsigned long loops_per_jiffy = (1<<12);
++EXPORT_SYMBOL(loops_per_jiffy);
++
++static int __init debug_kernel(char *str)
++{
++	console_loglevel = CONSOLE_LOGLEVEL_DEBUG;
++	return 0;
++}
++
++static int __init quiet_kernel(char *str)
++{
++	console_loglevel = CONSOLE_LOGLEVEL_QUIET;
++	return 0;
++}
++
++early_param("debug", debug_kernel);
++early_param("quiet", quiet_kernel);
++
++static int __init loglevel(char *str)
++{
++	int newlevel;
++
++	/*
++	 * Only update loglevel value when a correct setting was passed,
++	 * to prevent blind crashes (when loglevel being set to 0) that
++	 * are quite hard to debug
++	 */
++	if (get_option(&str, &newlevel)) {
++		console_loglevel = newlevel;
++		return 0;
++	}
++
++	return -EINVAL;
++}
++
++early_param("loglevel", loglevel);
++
++/* Change NUL term back to "=", to make "param" the whole string. */
++static int __init repair_env_string(char *param, char *val,
++				    const char *unused, void *arg)
++{
++	if (val) {
++		/* param=val or param="val"? */
++		if (val == param+strlen(param)+1)
++			val[-1] = '=';
++		else if (val == param+strlen(param)+2) {
++			val[-2] = '=';
++			memmove(val-1, val, strlen(val)+1);
++			val--;
++		} else
++			BUG();
++	}
++	return 0;
++}
++
++/* Anything after -- gets handed straight to init. */
++static int __init set_init_arg(char *param, char *val,
++			       const char *unused, void *arg)
++{
++	unsigned int i;
++
++	if (panic_later)
++		return 0;
++
++	repair_env_string(param, val, unused, NULL);
++
++	for (i = 0; argv_init[i]; i++) {
++		if (i == MAX_INIT_ARGS) {
++			panic_later = "init";
++			panic_param = param;
++			return 0;
++		}
++	}
++	argv_init[i] = param;
++	return 0;
++}
++
++/*
++ * Unknown boot options get handed to init, unless they look like
++ * unused parameters (modprobe will find them in /proc/cmdline).
++ */
++static int __init unknown_bootoption(char *param, char *val,
++				     const char *unused, void *arg)
++{
++	repair_env_string(param, val, unused, NULL);
++
++	/* Handle obsolete-style parameters */
++	if (obsolete_checksetup(param))
++		return 0;
++
++	/* Unused module parameter. */
++	if (strchr(param, '.') && (!val || strchr(param, '.') < val))
++		return 0;
++
++	if (panic_later)
++		return 0;
++
++	if (val) {
++		/* Environment option */
++		unsigned int i;
++		for (i = 0; envp_init[i]; i++) {
++			if (i == MAX_INIT_ENVS) {
++				panic_later = "env";
++				panic_param = param;
++			}
++			if (!strncmp(param, envp_init[i], val - param))
++				break;
++		}
++		envp_init[i] = param;
++	} else {
++		/* Command line option */
++		unsigned int i;
++		for (i = 0; argv_init[i]; i++) {
++			if (i == MAX_INIT_ARGS) {
++				panic_later = "init";
++				panic_param = param;
++			}
++		}
++		argv_init[i] = param;
++	}
++	return 0;
++}
++
++static int __init init_setup(char *str)
++{
++	unsigned int i;
++
++	execute_command = str;
++	/*
++	 * In case LILO is going to boot us with default command line,
++	 * it prepends "auto" before the whole cmdline which makes
++	 * the shell think it should execute a script with such name.
++	 * So we ignore all arguments entered _before_ init=... [MJ]
++	 */
++	for (i = 1; i < MAX_INIT_ARGS; i++)
++		argv_init[i] = NULL;
++	return 1;
++}
++__setup("init=", init_setup);
++
++static int __init rdinit_setup(char *str)
++{
++	unsigned int i;
++
++	ramdisk_execute_command = str;
++	/* See "auto" comment in init_setup */
++	for (i = 1; i < MAX_INIT_ARGS; i++)
++		argv_init[i] = NULL;
++	return 1;
++}
++__setup("rdinit=", rdinit_setup);
++
++#ifndef CONFIG_SMP
++static const unsigned int setup_max_cpus = NR_CPUS;
++static inline void setup_nr_cpu_ids(void) { }
++static inline void smp_prepare_cpus(unsigned int maxcpus) { }
++#endif
++
++/*
++ * We need to store the untouched command line for future reference.
++ * We also need to store the touched command line since the parameter
++ * parsing is performed in place, and we should allow a component to
++ * store reference of name/value for future reference.
++ */
++static void __init setup_command_line(char *command_line)
++{
++	size_t len = strlen(boot_command_line) + 1;
++
++	saved_command_line = memblock_alloc(len, SMP_CACHE_BYTES);
++	if (!saved_command_line)
++		panic("%s: Failed to allocate %zu bytes\n", __func__, len);
++
++	initcall_command_line =	memblock_alloc(len, SMP_CACHE_BYTES);
++	if (!initcall_command_line)
++		panic("%s: Failed to allocate %zu bytes\n", __func__, len);
++
++	static_command_line = memblock_alloc(len, SMP_CACHE_BYTES);
++	if (!static_command_line)
++		panic("%s: Failed to allocate %zu bytes\n", __func__, len);
++
++	strcpy(saved_command_line, boot_command_line);
++	strcpy(static_command_line, command_line);
++}
++
++/*
++ * We need to finalize in a non-__init function or else race conditions
++ * between the root thread and the init thread may cause start_kernel to
++ * be reaped by free_initmem before the root thread has proceeded to
++ * cpu_idle.
++ *
++ * gcc-3.4 accidentally inlines this function, so use noinline.
++ */
++
++static __initdata DECLARE_COMPLETION(kthreadd_done);
++
++noinline void __ref rest_init(void)
++{
++	struct task_struct *tsk;
++	int pid;
++
++	rcu_scheduler_starting();
++	/*
++	 * We need to spawn init first so that it obtains pid 1, however
++	 * the init task will end up wanting to create kthreads, which, if
++	 * we schedule it before we create kthreadd, will OOPS.
++	 */
++	pid = kernel_thread(kernel_init, NULL, CLONE_FS);
++	/*
++	 * Pin init on the boot CPU. Task migration is not properly working
++	 * until sched_init_smp() has been run. It will set the allowed
++	 * CPUs for init to the non isolated CPUs.
++	 */
++	rcu_read_lock();
++	tsk = find_task_by_pid_ns(pid, &init_pid_ns);
++	set_cpus_allowed_ptr(tsk, cpumask_of(smp_processor_id()));
++	rcu_read_unlock();
++
++	numa_default_policy();
++	pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES);
++	rcu_read_lock();
++	kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns);
++	rcu_read_unlock();
++
++	/*
++	 * Enable might_sleep() and smp_processor_id() checks.
++	 * They cannot be enabled earlier because with CONFIG_PREEMPTION=y
++	 * kernel_thread() would trigger might_sleep() splats. With
++	 * CONFIG_PREEMPT_VOLUNTARY=y the init task might have scheduled
++	 * already, but it's stuck on the kthreadd_done completion.
++	 */
++	system_state = SYSTEM_SCHEDULING;
++
++	complete(&kthreadd_done);
++
++	/*
++	 * The boot idle thread must execute schedule()
++	 * at least once to get things moving:
++	 */
++	schedule_preempt_disabled();
++	/* Call into cpu_idle with preempt disabled */
++	cpu_startup_entry(CPUHP_ONLINE);
++}
++
++/* Check for early params. */
++static int __init do_early_param(char *param, char *val,
++				 const char *unused, void *arg)
++{
++	const struct obs_kernel_param *p;
++
++	for (p = __setup_start; p < __setup_end; p++) {
++		if ((p->early && parameq(param, p->str)) ||
++		    (strcmp(param, "console") == 0 &&
++		     strcmp(p->str, "earlycon") == 0)
++		) {
++			if (p->setup_func(val) != 0)
++				pr_warn("Malformed early option '%s'\n", param);
++		}
++	}
++	/* We accept everything at this stage. */
++	return 0;
++}
++
++void __init parse_early_options(char *cmdline)
++{
++	parse_args("early options", cmdline, NULL, 0, 0, 0, NULL,
++		   do_early_param);
++}
++
++/* Arch code calls this early on, or if not, just before other parsing. */
++void __init parse_early_param(void)
++{
++	static int done __initdata;
++	static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata;
++
++	if (done)
++		return;
++
++	/* All fall through to do_early_param. */
++	strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE);
++	parse_early_options(tmp_cmdline);
++	done = 1;
++}
++
++void __init __weak arch_post_acpi_subsys_init(void) { }
++
++void __init __weak smp_setup_processor_id(void)
++{
++}
++
++# if THREAD_SIZE >= PAGE_SIZE
++void __init __weak thread_stack_cache_init(void)
++{
++}
++#endif
++
++void __init __weak mem_encrypt_init(void) { }
++
++void __init __weak poking_init(void) { }
++
++void __init __weak pgtable_cache_init(void) { }
++
++bool initcall_debug;
++core_param(initcall_debug, initcall_debug, bool, 0644);
++
++#ifdef TRACEPOINTS_ENABLED
++static void __init initcall_debug_enable(void);
++#else
++static inline void initcall_debug_enable(void)
++{
++}
++#endif
++
++/* Report memory auto-initialization states for this boot. */
++static void __init report_meminit(void)
++{
++	const char *stack;
++
++	if (IS_ENABLED(CONFIG_INIT_STACK_ALL))
++		stack = "all";
++	else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL))
++		stack = "byref_all";
++	else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF))
++		stack = "byref";
++	else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_USER))
++		stack = "__user";
++	else
++		stack = "off";
++
++	pr_info("mem auto-init: stack:%s, heap alloc:%s, heap free:%s\n",
++		stack, want_init_on_alloc(GFP_KERNEL) ? "on" : "off",
++		want_init_on_free() ? "on" : "off");
++	if (want_init_on_free())
++		pr_info("mem auto-init: clearing system memory may take some time...\n");
++}
++
++/*
++ * Set up kernel memory allocators
++ */
++static void __init mm_init(void)
++{
++	/*
++	 * page_ext requires contiguous pages,
++	 * bigger than MAX_ORDER unless SPARSEMEM.
++	 */
++	page_ext_init_flatmem();
++	init_debug_pagealloc();
++	report_meminit();
++	mem_init();
++	kmem_cache_init();
++	kmemleak_init();
++	pgtable_init();
++	debug_objects_mem_init();
++	vmalloc_init();
++	ioremap_huge_init();
++	/* Should be run before the first non-init thread is created */
++	init_espfix_bsp();
++	/* Should be run after espfix64 is set up. */
++	pti_init();
++}
++
++void __init __weak arch_call_rest_init(void)
++{
++	rest_init();
++}
++
++asmlinkage __visible void __init start_kernel(void)
++{
++	char *command_line;
++	char *after_dashes;
++
++	set_task_stack_end_magic(&init_task);
++	smp_setup_processor_id();
++	debug_objects_early_init();
++
++	cgroup_init_early();
++
++	local_irq_disable();
++	early_boot_irqs_disabled = true;
++
++	/*
++	 * Interrupts are still disabled. Do necessary setups, then
++	 * enable them.
++	 */
++	boot_cpu_init();
++	page_address_init();
++	pr_notice("%s", linux_banner);
++	early_security_init();
++	setup_arch(&command_line);
++	setup_command_line(command_line);
++	setup_nr_cpu_ids();
++	setup_per_cpu_areas();
++	smp_prepare_boot_cpu();	/* arch-specific boot-cpu hooks */
++	boot_cpu_hotplug_init();
++
++	build_all_zonelists(NULL);
++	page_alloc_init();
++
++	pr_notice("Kernel command line: %s\n", boot_command_line);
++	/* parameters may set static keys */
++	jump_label_init();
++	parse_early_param();
++	after_dashes = parse_args("Booting kernel",
++				  static_command_line, __start___param,
++				  __stop___param - __start___param,
++				  -1, -1, NULL, &unknown_bootoption);
++	if (!IS_ERR_OR_NULL(after_dashes))
++		parse_args("Setting init args", after_dashes, NULL, 0, -1, -1,
++			   NULL, set_init_arg);
++
++	/*
++	 * These use large bootmem allocations and must precede
++	 * kmem_cache_init()
++	 */
++	setup_log_buf(0);
++	vfs_caches_init_early();
++	sort_main_extable();
++	trap_init();
++	mm_init();
++
++	ftrace_init();
++
++	/* trace_printk can be enabled here */
++	early_trace_init();
++
++	/*
++	 * Set up the scheduler prior starting any interrupts (such as the
++	 * timer interrupt). Full topology setup happens at smp_init()
++	 * time - but meanwhile we still have a functioning scheduler.
++	 */
++	sched_init();
++	/*
++	 * Disable preemption - early bootup scheduling is extremely
++	 * fragile until we cpu_idle() for the first time.
++	 */
++	preempt_disable();
++	if (WARN(!irqs_disabled(),
++		 "Interrupts were enabled *very* early, fixing it\n"))
++		local_irq_disable();
++	radix_tree_init();
++
++	/*
++	 * Set up housekeeping before setting up workqueues to allow the unbound
++	 * workqueue to take non-housekeeping into account.
++	 */
++	housekeeping_init();
++
++	/*
++	 * Allow workqueue creation and work item queueing/cancelling
++	 * early.  Work item execution depends on kthreads and starts after
++	 * workqueue_init().
++	 */
++	workqueue_init_early();
++
++	rcu_init();
++
++	/* Trace events are available after this */
++	trace_init();
++
++	if (initcall_debug)
++		initcall_debug_enable();
++
++	context_tracking_init();
++	/* init some links before init_ISA_irqs() */
++	early_irq_init();
++	init_IRQ();
++	tick_init();
++	rcu_init_nohz();
++	init_timers();
++	hrtimers_init();
++	softirq_init();
++	timekeeping_init();
++
++	/*
++	 * For best initial stack canary entropy, prepare it after:
++	 * - setup_arch() for any UEFI RNG entropy and boot cmdline access
++	 * - timekeeping_init() for ktime entropy used in rand_initialize()
++	 * - rand_initialize() to get any arch-specific entropy like RDRAND
++	 * - add_latent_entropy() to get any latent entropy
++	 * - adding command line entropy
++	 */
++	rand_initialize();
++	add_latent_entropy();
++	add_device_randomness(command_line, strlen(command_line));
++	boot_init_stack_canary();
++
++	time_init();
++	perf_event_init();
++	profile_init();
++	call_function_init();
++	WARN(!irqs_disabled(), "Interrupts were enabled early\n");
++
++	early_boot_irqs_disabled = false;
++	local_irq_enable();
++
++	kmem_cache_init_late();
++
++	/*
++	 * HACK ALERT! This is early. We're enabling the console before
++	 * we've done PCI setups etc, and console_init() must be aware of
++	 * this. But we do want output early, in case something goes wrong.
++	 */
++	console_init();
++	if (panic_later)
++		panic("Too many boot %s vars at `%s'", panic_later,
++		      panic_param);
++
++	lockdep_init();
++
++	/*
++	 * Need to run this when irqs are enabled, because it wants
++	 * to self-test [hard/soft]-irqs on/off lock inversion bugs
++	 * too:
++	 */
++	locking_selftest();
++
++	/*
++	 * This needs to be called before any devices perform DMA
++	 * operations that might use the SWIOTLB bounce buffers. It will
++	 * mark the bounce buffers as decrypted so that their usage will
++	 * not cause "plain-text" data to be decrypted when accessed.
++	 */
++	mem_encrypt_init();
++
++#ifdef CONFIG_BLK_DEV_INITRD
++	if (initrd_start && !initrd_below_start_ok &&
++	    page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) {
++		pr_crit("initrd overwritten (0x%08lx < 0x%08lx) - disabling it.\n",
++		    page_to_pfn(virt_to_page((void *)initrd_start)),
++		    min_low_pfn);
++		initrd_start = 0;
++	}
++#endif
++	setup_per_cpu_pageset();
++	numa_policy_init();
++	acpi_early_init();
++	if (late_time_init)
++		late_time_init();
++	sched_clock_init();
++	calibrate_delay();
++	pid_idr_init();
++	anon_vma_init();
++#ifdef CONFIG_X86
++	if (efi_enabled(EFI_RUNTIME_SERVICES))
++		efi_enter_virtual_mode();
++#endif
++	thread_stack_cache_init();
++	cred_init();
++	fork_init();
++	proc_caches_init();
++	uts_ns_init();
++	buffer_init();
++	key_init();
++	security_init();
++	dbg_late_init();
++	vfs_caches_init();
++	pagecache_init();
++	signals_init();
++	seq_file_init();
++	proc_root_init();
++	nsfs_init();
++	cpuset_init();
++	cgroup_init();
++	taskstats_init_early();
++	delayacct_init();
++
++	poking_init();
++	check_bugs();
++
++	acpi_subsystem_init();
++	arch_post_acpi_subsys_init();
++	sfi_init_late();
++
++	/* Do the rest non-__init'ed, we're now alive */
++	arch_call_rest_init();
++
++	prevent_tail_call_optimization();
++}
++
++/* Call all constructor functions linked into the kernel. */
++static void __init do_ctors(void)
++{
++#ifdef CONFIG_CONSTRUCTORS
++	ctor_fn_t *fn = (ctor_fn_t *) __ctors_start;
++
++	for (; fn < (ctor_fn_t *) __ctors_end; fn++)
++		(*fn)();
++#endif
++}
++
++#ifdef CONFIG_KALLSYMS
++struct blacklist_entry {
++	struct list_head next;
++	char *buf;
++};
++
++static __initdata_or_module LIST_HEAD(blacklisted_initcalls);
++
++static int __init initcall_blacklist(char *str)
++{
++	char *str_entry;
++	struct blacklist_entry *entry;
++
++	/* str argument is a comma-separated list of functions */
++	do {
++		str_entry = strsep(&str, ",");
++		if (str_entry) {
++			pr_debug("blacklisting initcall %s\n", str_entry);
++			entry = memblock_alloc(sizeof(*entry),
++					       SMP_CACHE_BYTES);
++			if (!entry)
++				panic("%s: Failed to allocate %zu bytes\n",
++				      __func__, sizeof(*entry));
++			entry->buf = memblock_alloc(strlen(str_entry) + 1,
++						    SMP_CACHE_BYTES);
++			if (!entry->buf)
++				panic("%s: Failed to allocate %zu bytes\n",
++				      __func__, strlen(str_entry) + 1);
++			strcpy(entry->buf, str_entry);
++			list_add(&entry->next, &blacklisted_initcalls);
++		}
++	} while (str_entry);
++
++	return 0;
++}
++
++static bool __init_or_module initcall_blacklisted(initcall_t fn)
++{
++	struct blacklist_entry *entry;
++	char fn_name[KSYM_SYMBOL_LEN];
++	unsigned long addr;
++
++	if (list_empty(&blacklisted_initcalls))
++		return false;
++
++	addr = (unsigned long) dereference_function_descriptor(fn);
++	sprint_symbol_no_offset(fn_name, addr);
++
++	/*
++	 * fn will be "function_name [module_name]" where [module_name] is not
++	 * displayed for built-in init functions.  Strip off the [module_name].
++	 */
++	strreplace(fn_name, ' ', '\0');
++
++	list_for_each_entry(entry, &blacklisted_initcalls, next) {
++		if (!strcmp(fn_name, entry->buf)) {
++			pr_debug("initcall %s blacklisted\n", fn_name);
++			return true;
++		}
++	}
++
++	return false;
++}
++#else
++static int __init initcall_blacklist(char *str)
++{
++	pr_warn("initcall_blacklist requires CONFIG_KALLSYMS\n");
++	return 0;
++}
++
++static bool __init_or_module initcall_blacklisted(initcall_t fn)
++{
++	return false;
++}
++#endif
++__setup("initcall_blacklist=", initcall_blacklist);
++
++static __init_or_module void
++trace_initcall_start_cb(void *data, initcall_t fn)
++{
++	ktime_t *calltime = (ktime_t *)data;
++
++	printk(KERN_DEBUG "calling  %pS @ %i\n", fn, task_pid_nr(current));
++	*calltime = ktime_get();
++}
++
++static __init_or_module void
++trace_initcall_finish_cb(void *data, initcall_t fn, int ret)
++{
++	ktime_t *calltime = (ktime_t *)data;
++	ktime_t delta, rettime;
++	unsigned long long duration;
++
++	rettime = ktime_get();
++	delta = ktime_sub(rettime, *calltime);
++	duration = (unsigned long long) ktime_to_ns(delta) >> 10;
++	printk(KERN_DEBUG "initcall %pS returned %d after %lld usecs\n",
++		 fn, ret, duration);
++}
++
++static ktime_t initcall_calltime;
++
++#ifdef TRACEPOINTS_ENABLED
++static void __init initcall_debug_enable(void)
++{
++	int ret;
++
++	ret = register_trace_initcall_start(trace_initcall_start_cb,
++					    &initcall_calltime);
++	ret |= register_trace_initcall_finish(trace_initcall_finish_cb,
++					      &initcall_calltime);
++	WARN(ret, "Failed to register initcall tracepoints\n");
++}
++# define do_trace_initcall_start	trace_initcall_start
++# define do_trace_initcall_finish	trace_initcall_finish
++#else
++static inline void do_trace_initcall_start(initcall_t fn)
++{
++	if (!initcall_debug)
++		return;
++	trace_initcall_start_cb(&initcall_calltime, fn);
++}
++static inline void do_trace_initcall_finish(initcall_t fn, int ret)
++{
++	if (!initcall_debug)
++		return;
++	trace_initcall_finish_cb(&initcall_calltime, fn, ret);
++}
++#endif /* !TRACEPOINTS_ENABLED */
++
++int __init_or_module do_one_initcall(initcall_t fn)
++{
++	int count = preempt_count();
++	char msgbuf[64];
++	int ret;
++
++	if (initcall_blacklisted(fn))
++		return -EPERM;
++
++	do_trace_initcall_start(fn);
++	ret = fn();
++	do_trace_initcall_finish(fn, ret);
++
++	msgbuf[0] = 0;
++
++	if (preempt_count() != count) {
++		sprintf(msgbuf, "preemption imbalance ");
++		preempt_count_set(count);
++	}
++	if (irqs_disabled()) {
++		strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf));
++		local_irq_enable();
++	}
++	WARN(msgbuf[0], "initcall %pS returned with %s\n", fn, msgbuf);
++
++	add_latent_entropy();
++	return ret;
++}
++
++
++extern initcall_entry_t __initcall_start[];
++extern initcall_entry_t __initcall0_start[];
++extern initcall_entry_t __initcall1_start[];
++extern initcall_entry_t __initcall2_start[];
++extern initcall_entry_t __initcall3_start[];
++extern initcall_entry_t __initcall4_start[];
++extern initcall_entry_t __initcall5_start[];
++extern initcall_entry_t __initcall6_start[];
++extern initcall_entry_t __initcall7_start[];
++extern initcall_entry_t __initcall_end[];
++
++static initcall_entry_t *initcall_levels[] __initdata = {
++	__initcall0_start,
++	__initcall1_start,
++	__initcall2_start,
++	__initcall3_start,
++	__initcall4_start,
++	__initcall5_start,
++	__initcall6_start,
++	__initcall7_start,
++	__initcall_end,
++};
++
++/* Keep these in sync with initcalls in include/linux/init.h */
++static const char *initcall_level_names[] __initdata = {
++	"pure",
++	"core",
++	"postcore",
++	"arch",
++	"subsys",
++	"fs",
++	"device",
++	"late",
++};
++
++static void __init do_initcall_level(int level)
++{
++	initcall_entry_t *fn;
++
++	strcpy(initcall_command_line, saved_command_line);
++	parse_args(initcall_level_names[level],
++		   initcall_command_line, __start___param,
++		   __stop___param - __start___param,
++		   level, level,
++		   NULL, &repair_env_string);
++
++	trace_initcall_level(initcall_level_names[level]);
++	for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++)
++		do_one_initcall(initcall_from_entry(fn));
++}
++
++static void __init do_initcalls(void)
++{
++	int level;
++
++	for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++)
++		do_initcall_level(level);
++}
++
++/*
++ * Ok, the machine is now initialized. None of the devices
++ * have been touched yet, but the CPU subsystem is up and
++ * running, and memory and process management works.
++ *
++ * Now we can finally start doing some real work..
++ */
++static void __init do_basic_setup(void)
++{
++	cpuset_init_smp();
++	driver_init();
++	init_irq_proc();
++	do_ctors();
++	usermodehelper_enable();
++	do_initcalls();
++}
++
++static void __init do_pre_smp_initcalls(void)
++{
++	initcall_entry_t *fn;
++
++	trace_initcall_level("early");
++	for (fn = __initcall_start; fn < __initcall0_start; fn++)
++		do_one_initcall(initcall_from_entry(fn));
++}
++
++static int run_init_process(const char *init_filename)
++{
++	argv_init[0] = init_filename;
++	pr_info("Run %s as init process\n", init_filename);
++	return do_execve(getname_kernel(init_filename),
++		(const char __user *const __user *)argv_init,
++		(const char __user *const __user *)envp_init);
++}
++
++static int try_to_run_init_process(const char *init_filename)
++{
++	int ret;
++
++	ret = run_init_process(init_filename);
++
++	if (ret && ret != -ENOENT) {
++		pr_err("Starting init: %s exists but couldn't execute it (error %d)\n",
++		       init_filename, ret);
++	}
++
++	return ret;
++}
++
++static noinline void __init kernel_init_freeable(void);
++
++#if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_STRICT_MODULE_RWX)
++bool rodata_enabled __ro_after_init = true;
++static int __init set_debug_rodata(char *str)
++{
++	return strtobool(str, &rodata_enabled);
++}
++__setup("rodata=", set_debug_rodata);
++#endif
++
++#ifdef CONFIG_STRICT_KERNEL_RWX
++static void mark_readonly(void)
++{
++	if (rodata_enabled) {
++		/*
++		 * load_module() results in W+X mappings, which are cleaned
++		 * up with call_rcu().  Let's make sure that queued work is
++		 * flushed so that we don't hit false positives looking for
++		 * insecure pages which are W+X.
++		 */
++		rcu_barrier();
++		mark_rodata_ro();
++		rodata_test();
++	} else
++		pr_info("Kernel memory protection disabled.\n");
++}
++#else
++static inline void mark_readonly(void)
++{
++	pr_warn("This architecture does not have kernel memory protection.\n");
++}
++#endif
++
++void __weak free_initmem(void)
++{
++	free_initmem_default(POISON_FREE_INITMEM);
++}
++
++static int __ref kernel_init(void *unused)
++{
++	int ret;
++
++	kernel_init_freeable();
++	/* need to finish all async __init code before freeing the memory */
++	async_synchronize_full();
++	kprobe_free_init_mem();
++	ftrace_free_init_mem();
++	free_initmem();
++	mark_readonly();
++
++	/*
++	 * Kernel mappings are now finalized - update the userspace page-table
++	 * to finalize PTI.
++	 */
++	pti_finalize();
++
++	system_state = SYSTEM_RUNNING;
++	numa_default_policy();
++
++	rcu_end_inkernel_boot();
++
++	if (ramdisk_execute_command) {
++		ret = run_init_process(ramdisk_execute_command);
++		if (!ret)
++			return 0;
++		pr_err("Failed to execute %s (error %d)\n",
++		       ramdisk_execute_command, ret);
++	}
++
++	/*
++	 * We try each of these until one succeeds.
++	 *
++	 * The Bourne shell can be used instead of init if we are
++	 * trying to recover a really broken machine.
++	 */
++	if (execute_command) {
++		ret = run_init_process(execute_command);
++		if (!ret)
++			return 0;
++		panic("Requested init %s failed (error %d).",
++		      execute_command, ret);
++	}
++	if (!try_to_run_init_process("/sbin/init") ||
++	    !try_to_run_init_process("/etc/init") ||
++	    !try_to_run_init_process("/bin/init") ||
++	    !try_to_run_init_process("/bin/sh"))
++		return 0;
++
++	panic("No working init found.  Try passing init= option to kernel. "
++	      "See Linux Documentation/admin-guide/init.rst for guidance.");
++}
++
++static noinline void __init kernel_init_freeable(void)
++{
++	/*
++	 * Wait until kthreadd is all set-up.
++	 */
++	wait_for_completion(&kthreadd_done);
++
++	/* Now the scheduler is fully set up and can do blocking allocations */
++	gfp_allowed_mask = __GFP_BITS_MASK;
++
++	/*
++	 * init can allocate pages on any node
++	 */
++	set_mems_allowed(node_states[N_MEMORY]);
++
++	cad_pid = task_pid(current);
++
++	smp_prepare_cpus(setup_max_cpus);
++
++	workqueue_init();
++
++	init_mm_internals();
++
++	do_pre_smp_initcalls();
++	lockup_detector_init();
++
++	smp_init();
++	sched_init_smp();
++
++	page_alloc_init_late();
++	/* Initialize page ext after all struct pages are initialized. */
++	page_ext_init();
++
++	do_basic_setup();
++
++	/* Open the /dev/console on the rootfs, this should never fail */
++	if (ksys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0)
++		pr_err("Warning: unable to open an initial console.\n");
++
++	(void) ksys_dup(0);
++	(void) ksys_dup(0);
++	/*
++	 * check if there is an early userspace init.  If yes, let it do all
++	 * the work
++	 */
++
++	if (!ramdisk_execute_command)
++		ramdisk_execute_command = "/init";
++
++	if (ksys_access((const char __user *)
++			ramdisk_execute_command, 0) != 0) {
++		ramdisk_execute_command = NULL;
++		prepare_namespace();
++	}
++
++	/*
++	 * Ok, we have completed the initial bootup, and
++	 * we're essentially up and running. Get rid of the
++	 * initmem segments and start the user-mode stuff..
++	 *
++	 * rootfs is available now, try loading the public keys
++	 * and default modules
++	 */
++
++	integrity_load_keys();
++}