From: Nikunj A. Dadhania <nikunj@linux.vnet.ibm.com>
Date: Tue, 7 Jun 2011 10:13:22 +0000 (+0530)
Subject: sched: Remove rcu_read_lock() from wake_affine()
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=2a46dae38087e62dd5fb08a6dadf1407717ed13c;p=mv-sheeva.git

sched: Remove rcu_read_lock() from wake_affine()

wake_affine() is only called from one path: select_task_rq_fair(),
which already has the RCU read lock held.

Signed-off-by: Nikunj A. Dadhania <nikunj@linux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Link: http://lkml.kernel.org/r/20110607101251.777.34547.stgit@IBM-009124035060.in.ibm.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 433491c2dc8..eb98f77b38e 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -1481,7 +1481,6 @@ static int wake_affine(struct sched_domain *sd, struct task_struct *p, int sync)
 	 * effect of the currently running task from the load
 	 * of the current CPU:
 	 */
-	rcu_read_lock();
 	if (sync) {
 		tg = task_group(current);
 		weight = current->se.load.weight;
@@ -1517,7 +1516,6 @@ static int wake_affine(struct sched_domain *sd, struct task_struct *p, int sync)
 		balanced = this_eff_load <= prev_eff_load;
 	} else
 		balanced = true;
-	rcu_read_unlock();
 
 	/*
 	 * If the currently running task will sleep within