linux-kernel - [PATCH] sched: correct testing need_resched in mutex_spin_on

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Date:	Tue, 7 Jun 2011 21:41:03 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>
Subject: [PATCH] sched: correct testing need_resched in mutex_spin_on_owner()

It is suppose to check the owner task that is not absolutly running on the
local CPU, and if NEED_RESCHED is happenly set on the current task of local
CPU, we get incorrect result.

Signed-off-by: Hillf Danton <dhillf@...il.com>
---
 kernel/sched.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/sched.c b/kernel/sched.c
index fd18f39..3ea64fe 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -4326,7 +4326,7 @@ int mutex_spin_on_owner(struct mutex *lock,
struct task_struct *owner)
 		return 0;

 	while (owner_running(lock, owner)) {
-		if (need_resched())
+		if (test_tsk_need_resched(owner))
 			return 0;

 		arch_mutex_cpu_relax();
--
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