linux-kernel - [git pull] scheduler fix

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Date:	Wed, 7 Jan 2009 23:26:41 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: [git pull] scheduler fix

Linus,

Please pull the latest sched-fixes-for-linus git tree from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip.git sched-fixes-for-linus

 Thanks,

	Ingo

------------------>
Peter Zijlstra (1):
      sched: fix possible recursive rq->lock


 kernel/sched.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/kernel/sched.c b/kernel/sched.c
index 2e3545f..deb5ac8 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -3728,8 +3728,13 @@ redo:
 		}
 
 		double_unlock_balance(this_rq, busiest);
+		/*
+		 * Should not call ttwu while holding a rq->lock
+		 */
+		spin_unlock(&this_rq->lock);
 		if (active_balance)
 			wake_up_process(busiest->migration_thread);
+		spin_lock(&this_rq->lock);
 
 	} else
 		sd->nr_balance_failed = 0;
--
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