linux-kernel - [tip:sched/urgent] sched: Fix rt_rq->pushable_tasks initialization in init_rt

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Date:	Fri, 10 Jul 2009 10:41:26 GMT
From:	tip-bot for Fabio Checconi <fchecconi@...il.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, fchecconi@...il.com,
	fabio@...dalf.sssup.it, tglx@...utronix.de, ghaskins@...ell.com,
	mingo@...e.hu
Subject: [tip:sched/urgent] sched: Fix rt_rq->pushable_tasks initialization in init_rt_rq()

Commit-ID:  c20b08e3986c2dbfa6df1e880bf4f7159994d199
Gitweb:     http://git.kernel.org/tip/c20b08e3986c2dbfa6df1e880bf4f7159994d199
Author:     Fabio Checconi <fchecconi@...il.com>
AuthorDate: Mon, 15 Jun 2009 20:56:38 +0200
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Fri, 10 Jul 2009 10:43:30 +0200

sched: Fix rt_rq->pushable_tasks initialization in init_rt_rq()

init_rt_rq() initializes only rq->rt.pushable_tasks, and not the
pushable_tasks field of the passed rt_rq.  The plist is not used
uninitialized since the only pushable_tasks plists used are the
ones of root rt_rqs; anyway reinitializing the list on every group
creation corrupts the root plist, losing its previous contents.

Signed-off-by: Fabio Checconi <fabio@...dalf.sssup.it>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
LKML-Reference: <20090615185638.GK21741@...dalf.sssup.it>
CC: Gregory Haskins <ghaskins@...ell.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 kernel/sched.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/sched.c b/kernel/sched.c
index c4549bd..efecfda 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -9093,7 +9093,7 @@ static void init_rt_rq(struct rt_rq *rt_rq, struct rq *rq)
 #ifdef CONFIG_SMP
 	rt_rq->rt_nr_migratory = 0;
 	rt_rq->overloaded = 0;
-	plist_head_init(&rq->rt.pushable_tasks, &rq->lock);
+	plist_head_init(&rt_rq->pushable_tasks, &rq->lock);
 #endif
 
 	rt_rq->rt_time = 0;
--
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