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[PATCH] use smp_mb/wmb/rmb where possible

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Replace a number of memory barriers with smp_ variants.  This means we won't
take the unnecessary hit on UP machines.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
akpm@osdl.org 2005-05-01 08:58:47 -07:00 • committed by Linus Torvalds
parent 0d8d4d42f2
commit d59dd4620f
11 changed files with 31 additions and 31 deletions
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kernel/timer.c
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@ -1007,7 +1007,7 @@ asmlinkage long sys_getppid(void)
* Make sure we read the pid before re-reading the
* parent pointer:
*/
rmb();
smp_rmb();
parent = me->group_leader->real_parent;
if (old != parent)
continue;