linux-kernel - [RFC 1/3] mutex: In mutex_can_spin_on_owner(), return false if task need

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Date:	Tue, 14 Jan 2014 16:33:08 -0800
From:	Jason Low <jason.low2@...com>
To:	mingo@...hat.com, peterz@...radead.org, paulmck@...ux.vnet.ibm.com,
	Waiman.Long@...com, torvalds@...ux-foundation.org,
	tglx@...utronix.de, jason.low2@...com
Cc:	linux-kernel@...r.kernel.org, riel@...hat.com,
	akpm@...ux-foundation.org, davidlohr@...com, hpa@...or.com,
	aswin@...com, scott.norton@...com
Subject: [RFC 1/3] mutex: In mutex_can_spin_on_owner(), return false if task need_resched()

The mutex_can_spin_on_owner() function should also return false if the
task needs to be rescheduled.

Signed-off-by: Jason Low <jason.low2@...com>
---
 kernel/locking/mutex.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/kernel/locking/mutex.c b/kernel/locking/mutex.c
index 4dd6e4c..85c6be1 100644
--- a/kernel/locking/mutex.c
+++ b/kernel/locking/mutex.c
@@ -212,6 +212,9 @@ static inline int mutex_can_spin_on_owner(struct mutex *lock)
 	struct task_struct *owner;
 	int retval = 1;
 
+	if (need_resched())
+		return 0;
+
 	rcu_read_lock();
 	owner = ACCESS_ONCE(lock->owner);
 	if (owner)
-- 
1.7.1

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