From: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Date: Wed, 18 Feb 2015 20:24:30 +0000 (-0800)
Subject: rcu: Provide rcu_expedite_gp() and rcu_unexpedite_gp()
X-Git-Tag: omap-for-v4.1/fixes-rc1~158^2~2^2^4~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0d39482c3db13aae1db143d340816108dd53e443;p=pandora-kernel.git

rcu: Provide rcu_expedite_gp() and rcu_unexpedite_gp()

Currently, expediting of normal synchronous grace-period primitives
(synchronize_rcu() and friends) is controlled by the rcu_expedited()
boot/sysfs parameter.  This works well, but does not handle nesting.
This commit therefore provides rcu_expedite_gp() to enable expediting
and rcu_unexpedite_gp() to cancel a prior rcu_expedite_gp(), both of
which support nesting.

Reported-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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