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rcu: need barrier() in UP synchronize_sched_expedited()
authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Thu, 6 May 2010 18:42:52 +0000 (11:42 -0700)
committerTejun 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>

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