diff options
Diffstat (limited to 'include/asm-powerpc/system.h')
| -rw-r--r-- | include/asm-powerpc/system.h | 26 |
1 files changed, 17 insertions, 9 deletions
diff --git a/include/asm-powerpc/system.h b/include/asm-powerpc/system.h index d075725bf44..4c9f5229e83 100644 --- a/include/asm-powerpc/system.h +++ b/include/asm-powerpc/system.h @@ -39,7 +39,6 @@ #define read_barrier_depends() do { } while(0) #define set_mb(var, value) do { var = value; mb(); } while (0) -#define set_wmb(var, value) do { var = value; wmb(); } while (0) #ifdef __KERNEL__ #ifdef CONFIG_SMP @@ -54,6 +53,15 @@ #define smp_read_barrier_depends() do { } while(0) #endif /* CONFIG_SMP */ +/* + * This is a barrier which prevents following instructions from being + * started until the value of the argument x is known. For example, if + * x is a variable loaded from memory, this prevents following + * instructions from being executed until the load has been performed. + */ +#define data_barrier(x) \ + asm volatile("twi 0,%0,0; isync" : : "r" (x) : "memory"); + struct task_struct; struct pt_regs; @@ -220,8 +228,8 @@ __xchg_u32(volatile void *p, unsigned long val) " stwcx. %3,0,%2 \n\ bne- 1b" ISYNC_ON_SMP - : "=&r" (prev), "=m" (*(volatile unsigned int *)p) - : "r" (p), "r" (val), "m" (*(volatile unsigned int *)p) + : "=&r" (prev), "+m" (*(volatile unsigned int *)p) + : "r" (p), "r" (val) : "cc", "memory"); return prev; @@ -240,8 +248,8 @@ __xchg_u64(volatile void *p, unsigned long val) " stdcx. %3,0,%2 \n\ bne- 1b" ISYNC_ON_SMP - : "=&r" (prev), "=m" (*(volatile unsigned long *)p) - : "r" (p), "r" (val), "m" (*(volatile unsigned long *)p) + : "=&r" (prev), "+m" (*(volatile unsigned long *)p) + : "r" (p), "r" (val) : "cc", "memory"); return prev; @@ -299,8 +307,8 @@ __cmpxchg_u32(volatile unsigned int *p, unsigned long old, unsigned long new) ISYNC_ON_SMP "\n\ 2:" - : "=&r" (prev), "=m" (*p) - : "r" (p), "r" (old), "r" (new), "m" (*p) + : "=&r" (prev), "+m" (*p) + : "r" (p), "r" (old), "r" (new) : "cc", "memory"); return prev; @@ -322,8 +330,8 @@ __cmpxchg_u64(volatile unsigned long *p, unsigned long old, unsigned long new) ISYNC_ON_SMP "\n\ 2:" - : "=&r" (prev), "=m" (*p) - : "r" (p), "r" (old), "r" (new), "m" (*p) + : "=&r" (prev), "+m" (*p) + : "r" (p), "r" (old), "r" (new) : "cc", "memory"); return prev; |