diff options
| author | David Daney <ddaney@caviumnetworks.com> | 2010-01-08 17:17:43 -0800 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2010-02-27 12:53:06 +0100 |
| commit | f252ffd50c97dae87b45f1dbad24f71358ccfbd6 (patch) | |
| tree | c057fc7c3a819152603b286f935fb367fc48ae73 /arch/mips/include/asm/barrier.h | |
| parent | ec5380c768864c7afd92aa886dd4bb6d38497a01 (diff) | |
MIPS: New macro smp_mb__before_llsc.
Replace some instances of smp_llsc_mb() with a new macro
smp_mb__before_llsc(). It is used before ll/sc sequences that are
documented as needing write barrier semantics.
The default implementation of smp_mb__before_llsc() is just smp_llsc_mb(),
so there are no changes in semantics.
Also simplify definition of smp_mb(), smp_rmb(), and smp_wmb() to be just
barrier() in the non-SMP case.
Signed-off-by: David Daney <ddaney@caviumnetworks.com>
To: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/851/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/include/asm/barrier.h')
| -rw-r--r-- | arch/mips/include/asm/barrier.h | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/arch/mips/include/asm/barrier.h b/arch/mips/include/asm/barrier.h index 91785dc8e94e..1a5a51c3e96f 100644 --- a/arch/mips/include/asm/barrier.h +++ b/arch/mips/include/asm/barrier.h @@ -131,23 +131,26 @@ #endif /* !CONFIG_CPU_HAS_WB */ #if defined(CONFIG_WEAK_ORDERING) && defined(CONFIG_SMP) -#define __WEAK_ORDERING_MB " sync \n" +#define smp_mb() __asm__ __volatile__("sync" : : :"memory") +#define smp_rmb() __asm__ __volatile__("sync" : : :"memory") +#define smp_wmb() __asm__ __volatile__("sync" : : :"memory") #else -#define __WEAK_ORDERING_MB " \n" +#define smp_mb() barrier() +#define smp_rmb() barrier() +#define smp_wmb() barrier() #endif + #if defined(CONFIG_WEAK_REORDERING_BEYOND_LLSC) && defined(CONFIG_SMP) #define __WEAK_LLSC_MB " sync \n" #else #define __WEAK_LLSC_MB " \n" #endif -#define smp_mb() __asm__ __volatile__(__WEAK_ORDERING_MB : : :"memory") -#define smp_rmb() __asm__ __volatile__(__WEAK_ORDERING_MB : : :"memory") -#define smp_wmb() __asm__ __volatile__(__WEAK_ORDERING_MB : : :"memory") - #define set_mb(var, value) \ do { var = value; smp_mb(); } while (0) #define smp_llsc_mb() __asm__ __volatile__(__WEAK_LLSC_MB : : :"memory") +#define smp_mb__before_llsc() smp_llsc_mb() + #endif /* __ASM_BARRIER_H */ |