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Commit 9ef30894 authored by Roman Zippel's avatar Roman Zippel Committed by Linus Torvalds
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[PATCH] m68k: small system.h cleanup 



avoid unnecessary xchg() use in set_mb()

Signed-off-by: default avatarRoman Zippel <zippel@linux-m68k.org>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 6c04c28a

include/asm-m68k/system.h

+3 −3
Original line number Diff line number Diff line
@@ -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))))