From: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Date: Sat, 11 Jul 2015 23:24:45 +0000 (-0700)
Subject: rcu: Add fastpath bypassing funnel locking
X-Git-Tag: omap-for-v4.3/fixes-merge-window~28^2~1^2~1^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cdacbe1f91264687af956e810278030f2ab5a3d0;p=pandora-kernel.git

rcu: Add fastpath bypassing funnel locking

In the common case, there will be only one expedited grace period in
the system at a given time, in which case it is not helpful to use
funnel locking.  This commit therefore adds a fastpath that bypasses
funnel locking when the root ->exp_funnel_mutex is not held.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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