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[S390] atomic: use ACCESS_ONCE() for atomic_read() 

Let's make atomic_read() and atomic_set() behave like on all/most other
architectures. Generated code is identical with gcc 4.5.2.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2011-02-17 13:13:56 +01:00 committed by Martin Schwidefsky
parent 5da24b7627
commit 03e3b5a0f1
1 changed files with 2 additions and 6 deletions
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8
arch/s390/include/asm/atomic.h
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@ -36,14 +36,12 @@
static inline int atomic_read(const atomic_t *v) static inline int atomic_read(const atomic_t *v)
{ {
barrier(); return ACCESS_ONCE(v->counter);
return v->counter;
} }
static inline void atomic_set(atomic_t *v, int i) static inline void atomic_set(atomic_t *v, int i)
{ {
v->counter = i; v->counter = i;
barrier();
} }
static inline int atomic_add_return(int i, atomic_t *v) static inline int atomic_add_return(int i, atomic_t *v)
@ -128,14 +126,12 @@ static inline int atomic_add_unless(atomic_t *v, int a, int u)
static inline long long atomic64_read(const atomic64_t *v) static inline long long atomic64_read(const atomic64_t *v)
{ {
barrier(); return ACCESS_ONCE(v->counter);
return v->counter;
} }
static inline void atomic64_set(atomic64_t *v, long long i) static inline void atomic64_set(atomic64_t *v, long long i)
{ {
v->counter = i; v->counter = i;
barrier();
} }
static inline long long atomic64_add_return(long long i, atomic64_t *v) static inline long long atomic64_add_return(long long i, atomic64_t *v)