diff options
Diffstat (limited to 'arch/tile/include/asm/barrier.h')
| -rw-r--r-- | arch/tile/include/asm/barrier.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/tile/include/asm/barrier.h b/arch/tile/include/asm/barrier.h index b5a05d050a8f..96a42ae79f4d 100644 --- a/arch/tile/include/asm/barrier.h +++ b/arch/tile/include/asm/barrier.h @@ -72,6 +72,20 @@ mb_incoherent(void) #define mb() fast_mb() #define iob() fast_iob() +#ifndef __tilegx__ /* 32 bit */ +/* + * We need to barrier before modifying the word, since the _atomic_xxx() + * routines just tns the lock and then read/modify/write of the word. + * But after the word is updated, the routine issues an "mf" before returning, + * and since it's a function call, we don't even need a compiler barrier. + */ +#define smp_mb__before_atomic() smp_mb() +#define smp_mb__after_atomic() do { } while (0) +#else /* 64 bit */ +#define smp_mb__before_atomic() smp_mb() +#define smp_mb__after_atomic() smp_mb() +#endif + #include <asm-generic/barrier.h> #endif /* !__ASSEMBLY__ */ |