linux-kernel - [PATCH 3/3] rcu: use rt_mutex_lock_irqdisabled() in rcu

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Message-ID: <20111206032933.GC17091@zhy>
Date:	Tue, 6 Dec 2011 11:29:33 +0800
From:	Yong Zhang <yong.zhang0@...il.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, laijs@...fujitsu.com,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...ymtl.ca, josh@...htriplett.org,
	niv@...ibm.com, tglx@...utronix.de, peterz@...radead.org,
	rostedt@...dmis.org, Valdis.Kletnieks@...edu, dhowells@...hat.com,
	eric.dumazet@...il.com, darren@...art.com, patches@...aro.org
Subject: [PATCH 3/3] rcu: use rt_mutex_lock_irqdisabled() in rcu_boost()

Otherwise we will get false positive warning from might_sleep()

Signed-off-by: Yong Zhang <yong.zhang0@...il.com>
---
 kernel/rcutree_plugin.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/rcutree_plugin.h b/kernel/rcutree_plugin.h
index 2020e8a..489b1cd 100644
--- a/kernel/rcutree_plugin.h
+++ b/kernel/rcutree_plugin.h
@@ -1237,7 +1237,7 @@ static int rcu_boost(struct rcu_node *rnp)
 				   "rcu_boost_mutex");
 	t->rcu_boost_mutex = &mtx;
 	raw_spin_unlock(&rnp->lock); /* rrupts remain disabled. */
-	rt_mutex_lock(&mtx);  /* Side effect: boosts task t's priority. */
+	rt_mutex_lock_irqdisabled(&mtx);  /* Side effect: boosts task t's priority. */
 	rt_mutex_unlock(&mtx);  /* Keep lockdep happy. */
 	local_irq_restore(flags);
 
-- 
1.7.5.4

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