diff options
| author | Ingo Molnar <mingo@kernel.org> | 2013-10-11 07:39:37 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2013-10-11 07:39:37 +0200 |
| commit | ec0ad3d01f99d5e5b56a99a58f7003b99250dc65 (patch) | |
| tree | 85066cbea1cf8da6d099019adefaca90aae39234 /include/linux/compiler-gcc4.h | |
| parent | 3354781a2184380046c8dd19144628d3c33991e6 (diff) | |
| parent | 3f0116c3238a96bc18ad4b4acefe4e7be32fa861 (diff) | |
Merge branch 'core/urgent' into sched/core
Merge in asm goto fix, to be able to apply the asm/rmwcc.h fix.
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 |