diff options
Diffstat (limited to 'arch/s390/include/asm/atomic.h')
| -rw-r--r-- | arch/s390/include/asm/atomic.h | 28 |
1 files changed, 19 insertions, 9 deletions
diff --git a/arch/s390/include/asm/atomic.h b/arch/s390/include/asm/atomic.h index 76daea117181..d9db13810d15 100644 --- a/arch/s390/include/asm/atomic.h +++ b/arch/s390/include/asm/atomic.h @@ -9,7 +9,7 @@ * * Atomic operations that C can't guarantee us. * Useful for resource counting etc. - * s390 uses 'Compare And Swap' for atomicity in SMP enviroment. + * s390 uses 'Compare And Swap' for atomicity in SMP environment. * */ @@ -36,14 +36,19 @@ static inline int atomic_read(const atomic_t *v) { - barrier(); - return v->counter; + int c; + + asm volatile( + " l %0,%1\n" + : "=d" (c) : "Q" (v->counter)); + return c; } static inline void atomic_set(atomic_t *v, int i) { - v->counter = i; - barrier(); + asm volatile( + " st %1,%0\n" + : "=Q" (v->counter) : "d" (i)); } static inline int atomic_add_return(int i, atomic_t *v) @@ -128,14 +133,19 @@ static inline int atomic_add_unless(atomic_t *v, int a, int u) static inline long long atomic64_read(const atomic64_t *v) { - barrier(); - return v->counter; + long long c; + + asm volatile( + " lg %0,%1\n" + : "=d" (c) : "Q" (v->counter)); + return c; } static inline void atomic64_set(atomic64_t *v, long long i) { - v->counter = i; - barrier(); + asm volatile( + " stg %1,%0\n" + : "=Q" (v->counter) : "d" (i)); } static inline long long atomic64_add_return(long long i, atomic64_t *v) |