Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...

[tomoyo/tomoyo-test1.git] / include / linux / compiler.h

diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index eca8ad7..e786337 100644 (file)
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -185,8 +185,34 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val,
 #endif
 
 /* Unreachable code */
+#ifdef CONFIG_STACK_VALIDATION
+#define annotate_reachable() ({                                                \
+       asm("%c0:\n\t"                                                  \
+           ".pushsection .discard.reachable\n\t"                       \
+           ".long %c0b - .\n\t"                                        \
+           ".popsection\n\t" : : "i" (__LINE__));                      \
+})
+#define annotate_unreachable() ({                                      \
+       asm("%c0:\n\t"                                                  \
+           ".pushsection .discard.unreachable\n\t"                     \
+           ".long %c0b - .\n\t"                                        \
+           ".popsection\n\t" : : "i" (__LINE__));                      \
+})
+#define ASM_UNREACHABLE                                                        \
+       "999:\n\t"                                                      \
+       ".pushsection .discard.unreachable\n\t"                         \
+       ".long 999b - .\n\t"                                            \
+       ".popsection\n\t"
+#else
+#define annotate_reachable()
+#define annotate_unreachable()
+#endif
+
+#ifndef ASM_UNREACHABLE
+# define ASM_UNREACHABLE
+#endif
 #ifndef unreachable
-# define unreachable() do { } while (1)
+# define unreachable() do { annotate_reachable(); do { } while (1); } while (0)
 #endif
 
 /*
@@ -517,7 +543,8 @@ static __always_inline void __write_once_size(volatile void *p, void *res, int s
 # define __compiletime_error_fallback(condition) do { } while (0)
 #endif
 
-#define __compiletime_assert(condition, msg, prefix, suffix)           \
+#ifdef __OPTIMIZE__
+# define __compiletime_assert(condition, msg, prefix, suffix)          \
        do {                                                            \
                bool __cond = !(condition);                             \
                extern void prefix ## suffix(void) __compiletime_error(msg); \
@@ -525,6 +552,9 @@ static __always_inline void __write_once_size(volatile void *p, void *res, int s
                        prefix ## suffix();                             \
                __compiletime_error_fallback(__cond);                   \
        } while (0)
+#else
+# define __compiletime_assert(condition, msg, prefix, suffix) do { } while (0)
+#endif
 
 #define _compiletime_assert(condition, msg, prefix, suffix) \
        __compiletime_assert(condition, msg, prefix, suffix)