avoid unnecessary xchg() use in set_mb()
Signed-off-by: Roman Zippel <[email protected]>
---
include/asm-m68k/system.h | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
Index: linux-2.6/include/asm-m68k/system.h
===================================================================
--- linux-2.6.orig/include/asm-m68k/system.h
+++ linux-2.6/include/asm-m68k/system.h
@@ -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))))
--
-
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