[M68KNOMMU]: avoid unneccessary use of xchg() in set_mb()

[Greg Ungerer]

Avoid unneccessary use of xchg() in set_mb().

Signed-off-by: Greg Ungerer <gerg@xxxxxxxxxxx>
---

diff -Naurp linux-2.6.25-rc1/include/asm-m68knommu/system.h linux-2.6.x/include/asm-m68knommu/system.h
--- linux-2.6.25-rc1/include/asm-m68knommu/system.h	2008-02-11 14:50:23.000000000 +1000
+++ linux-2.6.x/include/asm-m68knommu/system.h	2008-02-12 13:58:55.000000000 +1000
@@ -104,7 +104,7 @@ asmlinkage void resume(void);
 #define mb()   asm volatile (""   : : :"memory")
 #define rmb()  asm volatile (""   : : :"memory")
 #define wmb()  asm volatile (""   : : :"memory")
-#define set_mb(var, value) do { xchg(&var, value); } while (0)
+#define set_mb(var, value)	({ (var) = (value); wmb(); })
 
 #ifdef CONFIG_SMP
 #define smp_mb()	mb()
--
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