From: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Date: Thu, 28 Feb 2008 00:21:10 +0000 (-0800)
Subject: rcupreempt: fix hibernate/resume in presence of PREEMPT_RCU and hotplug
X-Git-Tag: v2.6.25-rc4~130
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ae778869ae4549628b9e83efe958c3aaa63ed1b9;p=pandora-kernel.git

rcupreempt: fix hibernate/resume in presence of PREEMPT_RCU and hotplug

This fixes a oops encountered when doing hibernate/resume in presence of
PREEMPT_RCU.

The problem was that the code failed to disable preemption when
accessing a per-CPU variable.  This is OK when called from code that
already has preemption disabled, but such is not the case from the
suspend/resume code path.

Reported-by: Dave Young <hidave.darkstar@gmail.com>
Tested-by: Dave Young <hidave.darkstar@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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