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When an expedited grace period is ending, care must be taken so that all
the quiescent states propagated up to the root are correctly ordered
against the wake up of the main expedited grace period workqueue.
This ordering is already carried through the root rnp locking augmented
by an smp_mb__after_unlock_lock() barrier.
Therefore the explicit smp_mb() placed before the wake up is not needed
and can be removed.
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Reviewed-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>