diff options
Diffstat (limited to 'arch/arm/include/asm/atomic.h')
| -rw-r--r-- | arch/arm/include/asm/atomic.h | 44 |
1 files changed, 40 insertions, 4 deletions
diff --git a/arch/arm/include/asm/atomic.h b/arch/arm/include/asm/atomic.h index 62d2cb53b06..9a92fd7864a 100644 --- a/arch/arm/include/asm/atomic.h +++ b/arch/arm/include/asm/atomic.h @@ -60,6 +60,7 @@ static inline int atomic_add_return(int i, atomic_t *v) int result; smp_mb(); + prefetchw(&v->counter); __asm__ __volatile__("@ atomic_add_return\n" "1: ldrex %0, [%3]\n" @@ -99,6 +100,7 @@ static inline int atomic_sub_return(int i, atomic_t *v) int result; smp_mb(); + prefetchw(&v->counter); __asm__ __volatile__("@ atomic_sub_return\n" "1: ldrex %0, [%3]\n" @@ -121,6 +123,7 @@ static inline int atomic_cmpxchg(atomic_t *ptr, int old, int new) unsigned long res; smp_mb(); + prefetchw(&ptr->counter); do { __asm__ __volatile__("@ atomic_cmpxchg\n" @@ -138,6 +141,33 @@ static inline int atomic_cmpxchg(atomic_t *ptr, int old, int new) return oldval; } +static inline int __atomic_add_unless(atomic_t *v, int a, int u) +{ + int oldval, newval; + unsigned long tmp; + + smp_mb(); + prefetchw(&v->counter); + + __asm__ __volatile__ ("@ atomic_add_unless\n" +"1: ldrex %0, [%4]\n" +" teq %0, %5\n" +" beq 2f\n" +" add %1, %0, %6\n" +" strex %2, %1, [%4]\n" +" teq %2, #0\n" +" bne 1b\n" +"2:" + : "=&r" (oldval), "=&r" (newval), "=&r" (tmp), "+Qo" (v->counter) + : "r" (&v->counter), "r" (u), "r" (a) + : "cc"); + + if (oldval != u) + smp_mb(); + + return oldval; +} + #else /* ARM_ARCH_6 */ #ifdef CONFIG_SMP @@ -186,10 +216,6 @@ static inline int atomic_cmpxchg(atomic_t *v, int old, int new) return ret; } -#endif /* __LINUX_ARM_ARCH__ */ - -#define atomic_xchg(v, new) (xchg(&((v)->counter), new)) - static inline int __atomic_add_unless(atomic_t *v, int a, int u) { int c, old; @@ -200,6 +226,10 @@ static inline int __atomic_add_unless(atomic_t *v, int a, int u) return c; } +#endif /* __LINUX_ARM_ARCH__ */ + +#define atomic_xchg(v, new) (xchg(&((v)->counter), new)) + #define atomic_inc(v) atomic_add(1, v) #define atomic_dec(v) atomic_sub(1, v) @@ -299,6 +329,7 @@ static inline long long atomic64_add_return(long long i, atomic64_t *v) unsigned long tmp; smp_mb(); + prefetchw(&v->counter); __asm__ __volatile__("@ atomic64_add_return\n" "1: ldrexd %0, %H0, [%3]\n" @@ -340,6 +371,7 @@ static inline long long atomic64_sub_return(long long i, atomic64_t *v) unsigned long tmp; smp_mb(); + prefetchw(&v->counter); __asm__ __volatile__("@ atomic64_sub_return\n" "1: ldrexd %0, %H0, [%3]\n" @@ -364,6 +396,7 @@ static inline long long atomic64_cmpxchg(atomic64_t *ptr, long long old, unsigned long res; smp_mb(); + prefetchw(&ptr->counter); do { __asm__ __volatile__("@ atomic64_cmpxchg\n" @@ -388,6 +421,7 @@ static inline long long atomic64_xchg(atomic64_t *ptr, long long new) unsigned long tmp; smp_mb(); + prefetchw(&ptr->counter); __asm__ __volatile__("@ atomic64_xchg\n" "1: ldrexd %0, %H0, [%3]\n" @@ -409,6 +443,7 @@ static inline long long atomic64_dec_if_positive(atomic64_t *v) unsigned long tmp; smp_mb(); + prefetchw(&v->counter); __asm__ __volatile__("@ atomic64_dec_if_positive\n" "1: ldrexd %0, %H0, [%3]\n" @@ -436,6 +471,7 @@ static inline int atomic64_add_unless(atomic64_t *v, long long a, long long u) int ret = 1; smp_mb(); + prefetchw(&v->counter); __asm__ __volatile__("@ atomic64_add_unless\n" "1: ldrexd %0, %H0, [%4]\n" |