From: Greg Ungerer <gerg@snapgear.com>
Date: Fri, 15 Feb 2008 03:31:25 +0000 (-0800)
Subject: m68knommu: avoid unneccessary use of xchg() in set_mb()
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=091b76d6aa788d8294caa2895cea1013f3eff7da;p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git

m68knommu: avoid unneccessary use of xchg() in set_mb()

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

Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/include/asm-m68knommu/system.h b/include/asm-m68knommu/system.h
index 039ab3f81732..64c64432bbb8 100644
--- a/include/asm-m68knommu/system.h
+++ b/include/asm-m68knommu/system.h
@@ -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()