tree da507192551987d4841fccc541a5b94adfef4f01
parent b0a0f667a349247bd7f05f806b662a25653822bc
author Dongdong Deng <dongdong.deng@windriver.com> 1285662763 +0800
committer Paul E. McKenney <paulmck@linux.vnet.ibm.com> 1286473266 -0700

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>