From 2cd6563262f305f6745e2ae2e3e52277cbcdef0f Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Fri, 18 Oct 2002 00:40:02 -0700 Subject: Make x86 UP "set_mb()" use a lighter barrier than doing a full locked "xchg". It only needs a compiler barrier on UP. --- include/asm-i386/system.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/include/asm-i386/system.h b/include/asm-i386/system.h index d6b04c0fed09..9bdecec2a229 100644 --- a/include/asm-i386/system.h +++ b/include/asm-i386/system.h @@ -296,13 +296,14 @@ static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old, #define smp_mb() mb() #define smp_rmb() rmb() #define smp_wmb() wmb() +#define set_mb(var, value) do { xchg(&var, value); } while (0) #else #define smp_mb() barrier() #define smp_rmb() barrier() #define smp_wmb() barrier() +#define set_mb(var, value) do { var = value; barrier(); } while (0) #endif -#define set_mb(var, value) do { xchg(&var, value); } while (0) #define set_wmb(var, value) do { var = value; wmb(); } while (0) /* interrupt control.. */ -- cgit v1.2.3