diff options
| author | Paul Burton <paul.burton@mips.com> | 2019-10-02 00:53:05 +0300 |
|---|---|---|
| committer | Paul Burton <paul.burton@mips.com> | 2019-10-07 19:42:13 +0300 |
| commit | 878f75c7a2530471844a93b01e887f09d24ed57f (patch) | |
| tree | 0f9a4e991bb680f9923272d31482d3e636950ef5 /arch/mips/include/asm/llsc.h | |
| parent | 376357aca715c27f716844e9825417e12e3b02e7 (diff) | |
| download | linux-878f75c7a2530471844a93b01e887f09d24ed57f.tar.xz | |
MIPS: Unify sc beqz definition
We currently duplicate the definition of __scbeqz in asm/atomic.h &
asm/cmpxchg.h. Move it to asm/llsc.h & rename it to __SC_BEQZ to fit
better with the existing __SC macro provided there.
We include a tab in the string in order to avoid the need for users to
indent code any further to include whitespace of their own after the
instruction mnemonic.
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: linux-mips@vger.kernel.org
Cc: Huacai Chen <chenhc@lemote.com>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: linux-kernel@vger.kernel.org
Diffstat (limited to 'arch/mips/include/asm/llsc.h')
| -rw-r--r-- | arch/mips/include/asm/llsc.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/mips/include/asm/llsc.h b/arch/mips/include/asm/llsc.h index c6d17d171147..9b19f38562ac 100644 --- a/arch/mips/include/asm/llsc.h +++ b/arch/mips/include/asm/llsc.h @@ -25,4 +25,15 @@ #define __EXT "dext " #endif +/* + * Using a branch-likely instruction to check the result of an sc instruction + * works around a bug present in R10000 CPUs prior to revision 3.0 that could + * cause ll-sc sequences to execute non-atomically. + */ +#if R10000_LLSC_WAR +# define __SC_BEQZ "beqzl " +#else +# define __SC_BEQZ "beqz " +#endif + #endif /* __ASM_LLSC_H */ |