From: Paul E. McKenney <paul.mckenney@linaro.org>
Date: Thu, 5 May 2011 04:43:49 +0000 (-0700)
Subject: rcu: permit rcu_read_unlock() to be called while holding runqueue locks
X-Git-Tag: v3.0-rc1~392^2~43
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1217ed1b;p=pandora-kernel.git

rcu: permit rcu_read_unlock() to be called while holding runqueue locks

Avoid calling into the scheduler while holding core RCU locks.  This
allows rcu_read_unlock() to be called while holding the runqueue locks,
but only as long as there was no chance of the RCU read-side critical
section having been preempted.  (Otherwise, if RCU priority boosting
is enabled, rcu_read_unlock() might call into the scheduler in order to
unboost itself, which might allows self-deadlock on the runqueue locks
within the scheduler.)

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

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