diff options
| author | Ingo Molnar <mingo@kernel.org> | 2013-10-15 07:05:06 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2013-10-15 07:05:18 +0200 |
| commit | 426ee9e3bbc478ed9c0a079a4270f6095f0eb975 (patch) | |
| tree | d8f295e2e516a61b2ab8ccb49f5b1d9fb67979bd /include/linux/compiler-gcc4.h | |
| parent | b7af41a1bc255c0098c37a4bcf5c7e5e168ce875 (diff) | |
| parent | 61e6cfa80de5760bbe406f4e815b7739205754d2 (diff) | |
Merge tag 'v3.12-rc5' into perf/core
Merge Linux v3.12-rc5, to pick up the latest fixes.
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/linux/compiler-gcc4.h')
| -rw-r--r-- | include/linux/compiler-gcc4.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/include/linux/compiler-gcc4.h b/include/linux/compiler-gcc4.h index 842de225055..ded429966c1 100644 --- a/include/linux/compiler-gcc4.h +++ b/include/linux/compiler-gcc4.h @@ -65,6 +65,21 @@ #define __visible __attribute__((externally_visible)) #endif +/* + * GCC 'asm goto' miscompiles certain code sequences: + * + * http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58670 + * + * Work it around via a compiler barrier quirk suggested by Jakub Jelinek. + * Fixed in GCC 4.8.2 and later versions. + * + * (asm goto is automatically volatile - the naming reflects this.) + */ +#if GCC_VERSION <= 40801 +# define asm_volatile_goto(x...) do { asm goto(x); asm (""); } while (0) +#else +# define asm_volatile_goto(x...) do { asm goto(x); } while (0) +#endif #ifdef CONFIG_ARCH_USE_BUILTIN_BSWAP #if GCC_VERSION >= 40400 |