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[PATCH] m68k: small system.h cleanup

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avoid unnecessary xchg() use in set_mb()

Signed-off-by: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Roman Zippel 2006-10-06 00:43:56 -07:00 committed by Linus Torvalds
parent 6c04c28a65
commit 9ef308946f
1 changed files with 3 additions and 3 deletions
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6
include/asm-m68k/system.h
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@ -78,13 +78,13 @@ static inline int irqs_disabled(void)
#define mb() barrier()
#define rmb() barrier()
#define wmb() barrier()
#define read_barrier_depends() do { } while(0)
#define set_mb(var, value) do { xchg(&var, value); } while (0)
#define read_barrier_depends() ((void)0)
#define set_mb(var, value) ({ (var) = (value); wmb(); })
#define smp_mb() barrier()
#define smp_rmb() barrier()
#define smp_wmb() barrier()
#define smp_read_barrier_depends() do { } while(0)
#define smp_read_barrier_depends() ((void)0)
#define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))