Commit ccdea2f8 authored by Ralf Baechle's avatar Ralf Baechle Committed by Linus Torvalds
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[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: default avatarRalf Baechle <ralf@linux-mips.org>
Acked-by: default avatarIngo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent e384bd16
...@@ -552,7 +552,7 @@ static void wake_futex(struct futex_q *q) ...@@ -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 * at the end of wake_up_all() does not prevent this store from
* moving. * moving.
*/ */
wmb(); smp_wmb();
q->lock_ptr = NULL; q->lock_ptr = NULL;
} }
......
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