From: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Date: Tue, 5 Aug 2014 12:10:24 +0000 (-0700)
Subject: rcu: Make rcu_tasks_kthread()'s GP-wait loop allow preemption
X-Git-Tag: fixes-against-v3.18-rc2~103^2~1^2~15^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8f20a5e83d2c5d0e126a2fc9bca67f7430dac907;p=pandora-kernel.git

rcu: Make rcu_tasks_kthread()'s GP-wait loop allow preemption

The grace-period-wait loop in rcu_tasks_kthread() is under (unnecessary)
RCU protection, and therefore has no preemption points in a PREEMPT=n
kernel.  This commit therefore removes the RCU protection and inserts
cond_resched().

Reported-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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