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+diff -Nur linux-2.6.32.70.orig/include/linux/compiler-gcc.h linux-2.6.32.70/include/linux/compiler-gcc.h
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+--- linux-2.6.32.70.orig/include/linux/compiler-gcc.h 2016-01-29 22:13:00.000000000 +0100
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++++ linux-2.6.32.70/include/linux/compiler-gcc.h 2017-09-26 03:48:39.644239377 +0200
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+@@ -6,6 +6,10 @@
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+ * Common definitions for all gcc versions go here.
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+ */
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+
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++#define GCC_VERSION (__GNUC__ * 10000 \
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++ + __GNUC_MINOR__ * 100 \
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++ + __GNUC_PATCHLEVEL__)
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++
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+
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+ /* Optimization barrier */
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+ /* The "volatile" is due to gcc bugs */
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+@@ -79,8 +83,167 @@
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+ #define noinline __attribute__((noinline))
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+ #define __attribute_const__ __attribute__((__const__))
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+ #define __maybe_unused __attribute__((unused))
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++#define __always_unused __attribute__((unused))
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++
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++/* gcc version specific checks */
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++
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++#if GCC_VERSION < 30200
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++# error Sorry, your compiler is too old - please upgrade it.
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++#endif
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++
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++#if GCC_VERSION < 30300
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++# define __used __attribute__((__unused__))
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++#else
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++# define __used __attribute__((__used__))
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++#endif
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++
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++#ifdef CONFIG_GCOV_KERNEL
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++# if GCC_VERSION < 30400
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++# error "GCOV profiling support for gcc versions below 3.4 not included"
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++# endif /* __GNUC_MINOR__ */
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++#endif /* CONFIG_GCOV_KERNEL */
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++
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++#if GCC_VERSION >= 30400
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++#define __must_check __attribute__((warn_unused_result))
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++#endif
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++
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++#if GCC_VERSION >= 40000
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++
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++/* GCC 4.1.[01] miscompiles __weak */
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++#ifdef __KERNEL__
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++# if GCC_VERSION >= 40100 && GCC_VERSION <= 40101
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++# error Your version of gcc miscompiles the __weak directive
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++# endif
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++#endif
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++
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++#define __used __attribute__((__used__))
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++#define __compiler_offsetof(a, b) \
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++ __builtin_offsetof(a, b)
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++
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++#if GCC_VERSION >= 40100 && GCC_VERSION < 40600
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++# define __compiletime_object_size(obj) __builtin_object_size(obj, 0)
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++#endif
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++
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++#if GCC_VERSION >= 40300
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++/* Mark functions as cold. gcc will assume any path leading to a call
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++ * to them will be unlikely. This means a lot of manual unlikely()s
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++ * are unnecessary now for any paths leading to the usual suspects
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++ * like BUG(), printk(), panic() etc. [but let's keep them for now for
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++ * older compilers]
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++ *
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++ * Early snapshots of gcc 4.3 don't support this and we can't detect this
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++ * in the preprocessor, but we can live with this because they're unreleased.
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++ * Maketime probing would be overkill here.
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++ *
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++ * gcc also has a __attribute__((__hot__)) to move hot functions into
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++ * a special section, but I don't see any sense in this right now in
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++ * the kernel context
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++ */
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++#define __cold __attribute__((__cold__))
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++
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++#define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
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++
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++#ifndef __CHECKER__
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++# define __compiletime_warning(message) __attribute__((warning(message)))
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++# define __compiletime_error(message) __attribute__((error(message)))
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++#endif /* __CHECKER__ */
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++#endif /* GCC_VERSION >= 40300 */
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++
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++#if GCC_VERSION >= 40500
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++/*
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++ * Mark a position in code as unreachable. This can be used to
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++ * suppress control flow warnings after asm blocks that transfer
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++ * control elsewhere.
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++ *
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++ * Early snapshots of gcc 4.5 don't support this and we can't detect
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++ * this in the preprocessor, but we can live with this because they're
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++ * unreleased. Really, we need to have autoconf for the kernel.
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++ */
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++#define unreachable() __builtin_unreachable()
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++
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++/* Mark a function definition as prohibited from being cloned. */
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++#define __noclone __attribute__((__noclone__, __optimize__("no-tracer")))
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++
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++#endif /* GCC_VERSION >= 40500 */
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++
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++#if GCC_VERSION >= 40600
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++/*
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++ * When used with Link Time Optimization, gcc can optimize away C functions or
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++ * variables which are referenced only from assembly code. __visible tells the
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++ * optimizer that something else uses this function or variable, thus preventing
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++ * this.
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++ */
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++#define __visible __attribute__((externally_visible))
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++#endif
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++
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++
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++#if GCC_VERSION >= 40900 && !defined(__CHECKER__)
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++/*
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++ * __assume_aligned(n, k): Tell the optimizer that the returned
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++ * pointer can be assumed to be k modulo n. The second argument is
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++ * optional (default 0), so we use a variadic macro to make the
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++ * shorthand.
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++ *
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++ * Beware: Do not apply this to functions which may return
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++ * ERR_PTRs. Also, it is probably unwise to apply it to functions
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++ * returning extra information in the low bits (but in that case the
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++ * compiler should see some alignment anyway, when the return value is
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++ * massaged by 'flags = ptr & 3; ptr &= ~3;').
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++ */
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++#define __assume_aligned(a, ...) __attribute__((__assume_aligned__(a, ## __VA_ARGS__)))
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++#endif
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++
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++/*
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++ * GCC 'asm goto' miscompiles certain code sequences:
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++ *
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++ * http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58670
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++ *
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++ * Work it around via a compiler barrier quirk suggested by Jakub Jelinek.
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++ *
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++ * (asm goto is automatically volatile - the naming reflects this.)
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++ */
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++#define asm_volatile_goto(x...) do { asm goto(x); asm (""); } while (0)
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++
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++#ifdef CONFIG_ARCH_USE_BUILTIN_BSWAP
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++#if GCC_VERSION >= 40400
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++#define __HAVE_BUILTIN_BSWAP32__
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++#define __HAVE_BUILTIN_BSWAP64__
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++#endif
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++#if GCC_VERSION >= 40800 || (defined(__powerpc__) && GCC_VERSION >= 40600)
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++#define __HAVE_BUILTIN_BSWAP16__
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++#endif
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++#endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP */
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++
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++#if GCC_VERSION >= 70000
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++#define KASAN_ABI_VERSION 5
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++#elif GCC_VERSION >= 50000
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++#define KASAN_ABI_VERSION 4
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++#elif GCC_VERSION >= 40902
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++#define KASAN_ABI_VERSION 3
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++#endif
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++
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++#if GCC_VERSION >= 40902
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++/*
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++ * Tell the compiler that address safety instrumentation (KASAN)
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++ * should not be applied to that function.
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++ * Conflicts with inlining: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67368
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++ */
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++#define __no_sanitize_address __attribute__((no_sanitize_address))
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++#endif
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++
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++#endif /* gcc version >= 40000 specific checks */
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++
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++#if !defined(__noclone)
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++#define __noclone /* not needed */
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++#endif
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++
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++#if !defined(__no_sanitize_address)
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++#define __no_sanitize_address
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++#endif
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++
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++/*
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++ * A trick to suppress uninitialized variable warning without generating any
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++ * code
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++ */
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++#define uninitialized_var(x) x = x
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+
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+-#define __gcc_header(x) #x
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+-#define _gcc_header(x) __gcc_header(linux/compiler-gcc##x.h)
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+-#define gcc_header(x) _gcc_header(x)
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+-#include gcc_header(__GNUC__)
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Waldemar Brodkorb