diff options
Diffstat (limited to 'arch/mips/include/asm/barrier.h')
| -rw-r--r-- | arch/mips/include/asm/barrier.h | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/arch/mips/include/asm/barrier.h b/arch/mips/include/asm/barrier.h index f9a6da96aae1..9228f7386220 100644 --- a/arch/mips/include/asm/barrier.h +++ b/arch/mips/include/asm/barrier.h @@ -211,14 +211,22 @@ #define __smp_wmb() barrier() #endif +/* + * When LL/SC does imply order, it must also be a compiler barrier to avoid the + * compiler from reordering where the CPU will not. When it does not imply + * order, the compiler is also free to reorder across the LL/SC loop and + * ordering will be done by smp_llsc_mb() and friends. + */ #if defined(CONFIG_WEAK_REORDERING_BEYOND_LLSC) && defined(CONFIG_SMP) #define __WEAK_LLSC_MB " sync \n" +#define smp_llsc_mb() __asm__ __volatile__(__WEAK_LLSC_MB : : :"memory") +#define __LLSC_CLOBBER #else #define __WEAK_LLSC_MB " \n" +#define smp_llsc_mb() do { } while (0) +#define __LLSC_CLOBBER "memory" #endif -#define smp_llsc_mb() __asm__ __volatile__(__WEAK_LLSC_MB : : :"memory") - #ifdef CONFIG_CPU_CAVIUM_OCTEON #define smp_mb__before_llsc() smp_wmb() #define __smp_mb__before_llsc() __smp_wmb() |