From ccdea2f88b5689f0fd29c3804be43a3acf0311e3 Mon Sep 17 00:00:00 2001 From: Ralf Baechle Date: Wed, 6 Dec 2006 20:40:26 -0800 Subject: [PATCH] [PATCH] futex: remove unneeded barrier When disassembling a kernel I found around over 90 sync Instructions from mb, rmb and wmb calls in the kernel and only few of those make any sense to me. So here's the first one - I think the wmb() in kernel/futex.c is not needed on uniprocessors so should become an smb_wmb(). Signed-off-by: Ralf Baechle Acked-by: Ingo Molnar Cc: Thomas Gleixner Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- kernel/futex.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/futex.c b/kernel/futex.c index d60b7f7a8cc3..a8302a1620ea 100644 --- a/kernel/futex.c +++ b/kernel/futex.c @@ -552,7 +552,7 @@ static void wake_futex(struct futex_q *q) * at the end of wake_up_all() does not prevent this store from * moving. */ - wmb(); + smp_wmb(); q->lock_ptr = NULL; } -- 2.30.2