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[S390] atomic: use inline asm

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Use inline assemblies for atomic_read/set(). This way there shouldn't
be any questions or subtle volatile semantics left.

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 13:13:58 +01:00 committed by Martin Schwidefsky
parent a8c8d7c683
commit 7657e41a0b
1 changed files with 18 additions and 4 deletions
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22
arch/s390/include/asm/atomic.h
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@ -36,12 +36,19 @@
static inline int atomic_read(const atomic_t *v)
{
return ACCESS_ONCE(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;
asm volatile(
" st %1,%0\n"
: "=Q" (v->counter) : "d" (i));
}
static inline int atomic_add_return(int i, atomic_t *v)
@ -126,12 +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)
{
return ACCESS_ONCE(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;
asm volatile(
" stg %1,%0\n"
: "=Q" (v->counter) : "d" (i));
}
static inline long long atomic64_add_return(long long i, atomic64_t *v)