linux-kernel - [tip:sched/core] sched: Remove rcu_read_lock/unlock() from select_idle

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Date:	Wed, 22 Feb 2012 08:11:30 -0800
From:	"tip-bot for Nikunj A. Dadhania" <nikunj@...ux.vnet.ibm.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	a.p.zijlstra@...llo.nl, nikunj@...ux.vnet.ibm.com,
	tglx@...utronix.de, mingo@...e.hu
Subject: [tip:sched/core] sched: Remove rcu_read_lock/unlock()
  from select_idle_sibling()

Commit-ID:  62f6536a630affe3176deb48554d27ee58b65077
Gitweb:     http://git.kernel.org/tip/62f6536a630affe3176deb48554d27ee58b65077
Author:     Nikunj A. Dadhania <nikunj@...ux.vnet.ibm.com>
AuthorDate: Fri, 17 Feb 2012 08:34:30 +0530
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Wed, 22 Feb 2012 12:28:28 +0100

sched: Remove rcu_read_lock/unlock() from select_idle_sibling()

select_idle_sibling() is called from select_task_rq_fair(), which
already has the RCU read lock held.

Signed-off-by: Nikunj A. Dadhania <nikunj@...ux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Link: http://lkml.kernel.org/r/20120217030409.11748.12491.stgit@abhimanyu
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 kernel/sched/fair.c |    4 ----
 1 files changed, 0 insertions(+), 4 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 4ab60a2..6ce9992 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -2670,8 +2670,6 @@ static int select_idle_sibling(struct task_struct *p, int target)
 	/*
 	 * Otherwise, iterate the domains and find an elegible idle cpu.
 	 */
-	rcu_read_lock();
-
 	sd = rcu_dereference(per_cpu(sd_llc, target));
 	for_each_lower_domain(sd) {
 		sg = sd->groups;
@@ -2693,8 +2691,6 @@ next:
 		} while (sg != sd->groups);
 	}
 done:
-	rcu_read_unlock();
-
 	return target;
 }
 
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