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| author | Mike Frysinger <vapier@gentoo.org> | 2011-04-25 14:33:15 +0400 |
|---|---|---|
| committer | Rafael J. Wysocki <rjw@sisk.pl> | 2011-05-18 01:19:17 +0400 |
| commit | ee940d8dccd899aa1777ea84da3d9cd04b1d2e8e (patch) | |
| tree | 0bb19033f820a485dea0c5fc848206b6479fc7df /kernel/freezer.c | |
| parent | 3c431936087e93d2219a184a8e19eaa68077e379 (diff) | |
| download | linux-ee940d8dccd899aa1777ea84da3d9cd04b1d2e8e.tar.xz | |
Freezer: Use SMP barriers
The freezer processes are dealing with multiple threads running
simultaneously, and on a UP system, the memory reads/writes do
not need barriers to keep things in sync. These are only needed
on SMP systems, so use SMP barriers instead.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Diffstat (limited to 'kernel/freezer.c')
| -rw-r--r-- | kernel/freezer.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/freezer.c b/kernel/freezer.c index 66ecd2ead215..7b01de98bb6a 100644 --- a/kernel/freezer.c +++ b/kernel/freezer.c @@ -17,7 +17,7 @@ static inline void frozen_process(void) { if (!unlikely(current->flags & PF_NOFREEZE)) { current->flags |= PF_FROZEN; - wmb(); + smp_wmb(); } clear_freeze_flag(current); } @@ -93,7 +93,7 @@ bool freeze_task(struct task_struct *p, bool sig_only) * the task as frozen and next clears its TIF_FREEZE. */ if (!freezing(p)) { - rmb(); + smp_rmb(); if (frozen(p)) return false; |