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Diffstat (limited to 'include/linux/compiler.h')
-rw-r--r--include/linux/compiler.h38
1 files changed, 36 insertions, 2 deletions
diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index eca8ad75e28b..e95a2631e545 100644
--- 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
/*
@@ -475,6 +501,10 @@ static __always_inline void __write_once_size(volatile void *p, void *res, int s
#define __visible
#endif
+#ifndef __nostackprotector
+# define __nostackprotector
+#endif
+
/*
* Assume alignment of return value.
*/
@@ -517,7 +547,8 @@ 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 +556,9 @@ 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)