From: "Andi Kleen" <[email protected]>
local_t is actually a win over atomic_t because it does not need lock
prefixes.
Signed-off-by: Andi Kleen <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
---
25-akpm/include/asm-x86_64/local.h | 3 ++-
1 files changed, 2 insertions(+), 1 deletion(-)
diff -puN include/asm-x86_64/local.h~x86_64-correct-wrong-comment-in-localh include/asm-x86_64/local.h
--- 25/include/asm-x86_64/local.h~x86_64-correct-wrong-comment-in-localh 2005-04-12 03:21:24.242451488 -0700
+++ 25-akpm/include/asm-x86_64/local.h 2005-04-12 03:21:24.245451032 -0700
@@ -45,7 +45,8 @@ static __inline__ void local_sub(unsigne
:"ir" (i), "m" (v->counter));
}
-/* On x86, these are no better than the atomic variants. */
+/* On x86-64 these are better than the atomic variants on SMP kernels
+ because they dont use a lock prefix. */
#define __local_inc(l) local_inc(l)
#define __local_dec(l) local_dec(l)
#define __local_add(i,l) local_add((i),(l))
_
-
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