From: Dongdong Deng <dongdong.deng@windriver.com>
Date: Tue, 28 Sep 2010 08:32:43 +0000 (+0800)
Subject: rcu: using ACCESS_ONCE() to observe the jiffies_stall/rnp->qsmask value
X-Git-Tag: v2.6.37-rc1~215^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4ee0a603926cad973e4d384f48c5e279a0fd4118;p=pandora-kernel.git

rcu: using ACCESS_ONCE() to observe the jiffies_stall/rnp->qsmask value

Using ACCESS_ONCE() to observe the jiffies_stall/rnp->qsmask value
due to the caller didn't hold the root_rcu/rnp node's lock.  Although
use without ACCESS_ONCE() is safe due to the value loaded being used
but once, the ACCESS_ONCE() is a good documentation aid -- the variables
are being loaded without the services of a lock.

Signed-off-by: Dongdong Deng <dongdong.deng@windriver.com>
CC: Dipankar Sarma <dipankar@in.ibm.com>
CC: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
---

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