From: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Date: Mon, 4 Jan 2010 23:09:00 +0000 (-0800)
Subject: rcu: Adjust force_quiescent_state() locking, step 1
X-Git-Tag: v2.6.34-rc1~265^2~44
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f96e9232e04856c781d4f71923a46dd3f7b429fa;p=pandora-kernel.git

rcu: Adjust force_quiescent_state() locking, step 1

This causes rnp->lock to be held on entry to
force_quiescent_state()'s switch statement.  This is a first
step towards prohibiting starting grace periods while
force_quiescent_state() is executing, which will reduce the
number and complexity of races that force_quiescent_state() is
involved in.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: laijs@cn.fujitsu.com
Cc: dipankar@in.ibm.com
Cc: mathieu.desnoyers@polymtl.ca
Cc: josh@joshtriplett.org
Cc: dvhltc@us.ibm.com
Cc: niv@us.ibm.com
Cc: peterz@infradead.org
Cc: rostedt@goodmis.org
Cc: Valdis.Kletnieks@vt.edu
Cc: dhowells@redhat.com
LKML-Reference: <12626465501455-git-send-email->
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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