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rcu: need barrier() in UP synchronize_sched_expedited()
author
Paul E. McKenney
<paulmck@linux.vnet.ibm.com>
Thu, 6 May 2010 18:42:52 +0000
(11:42 -0700)
committer
Tejun Heo
<tj@kernel.org>
Fri, 7 May 2010 05:23:21 +0000
(07:23 +0200)
If synchronize_sched_expedited() is ever to be called from within
kernel/sched.c in a !SMP PREEMPT kernel, the !SMP implementation needs
a barrier().
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
kernel/sched.c
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diff --git
a/kernel/sched.c
b/kernel/sched.c
index
155a16d
..
fbaf312
100644
(file)
--- a/
kernel/sched.c
+++ b/
kernel/sched.c
@@
-8932,6
+8932,7
@@
struct cgroup_subsys cpuacct_subsys = {
void synchronize_sched_expedited(void)
{
+ barrier();
}
EXPORT_SYMBOL_GPL(synchronize_sched_expedited);