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rcu: need barrier() in UP synchronize_sched_expedited() 

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>
This commit is contained in:
Paul E. McKenney 2010-05-06 11:42:52 -07:00 committed by Tejun Heo
parent cc631fb732
commit fc390cde36
1 changed files with 1 additions and 0 deletions
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kernel/sched.c
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@ -8932,6 +8932,7 @@ struct cgroup_subsys cpuacct_subsys = {
void synchronize_sched_expedited(void) void synchronize_sched_expedited(void)
{ {
barrier();
} }
EXPORT_SYMBOL_GPL(synchronize_sched_expedited); EXPORT_SYMBOL_GPL(synchronize_sched_expedited);