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Commit 7657e41a authored by Heiko Carstens's avatar Heiko Carstens Committed by Martin Schwidefsky
Browse files

[S390] atomic: use inline asm 



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

Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent a8c8d7c6

arch/s390/include/asm/atomic.h

+18 −4
Original line number Diff line number Diff line
@@ -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)