linux-kernel - [PATCH resend] sched: fix need_resched() when checking peempt

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Message-ID: <BANLkTi=e=69xvJZ1+56xzuFyhmdN0hZHRQ@mail.gmail.com>
Date:	Tue, 31 May 2011 21:18:30 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	Mike Galbraith <efault@....de>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Yong Zhang <yong.zhang0@...il.com>
Subject: [PATCH resend] sched: fix need_resched() when checking peempt

The RT preempt check tests the wrong task if NEED_RESCHED is set. It currently
checks the local CPU task. It is suppose to check the task that is running on
the run queue we are about to wake another task on.

Signed-off-by: Hillf Danton <dhillf@...il.com>
Acked-by: Steven Rostedt <rostedt@...dmis.org>
Reviewed-by: Yong Zhang <yong.zhang0@...il.com>
---
 kernel/sched_rt.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index 88725c9..9b8d5dc 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -1096,7 +1096,7 @@ static void check_preempt_curr_rt(struct rq *rq,
struct task_struct *p, int flag
 	 * to move current somewhere else, making room for our non-migratable
 	 * task.
 	 */
-	if (p->prio == rq->curr->prio && !need_resched())
+	if (p->prio == rq->curr->prio && !test_tsk_need_resched(rq->curr))
 		check_preempt_equal_prio(rq, p);
 #endif
 }
--
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