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memory barrier: adding smp_mb__after_lock

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Adding smp_mb__after_lock define to be used as a smp_mb call after
a lock.

Making it nop for x86, since {read|write|spin}_lock() on x86 are
full memory barriers.

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jiri Olsa
2009-07-08 12:10:31 +00:00
committed by David S. Miller
parent a57de0b433
commit ad46276952
3 changed files with 13 additions and 1 deletions
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4
arch/x86/include/asm/spinlock.h
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@@ -302,4 +302,8 @@ static inline void __raw_write_unlock(raw_rwlock_t *rw)
#define _raw_read_relax(lock) cpu_relax()
#define _raw_write_relax(lock) cpu_relax()
/* The {read|write|spin}_lock() on x86 are full memory barriers. */
static inline void smp_mb__after_lock(void) { }
#define ARCH_HAS_SMP_MB_AFTER_LOCK
#endif /* _ASM_X86_SPINLOCK_H */