linux-kernel - [PATCH] sched: Make sure task has correct sched

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Message-Id: <e286470be617e07797b7.1253672517@mudlark.pw.nest>
Date:	Wed, 23 Sep 2009 02:21:57 -0000
From:	Peter Williams <pwil3058@...pond.net.au>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Mike Galbraith <efault@....de>,
	Linux Kernel Mailing <linux-kernel@...r.kernel.org>
Subject: [PATCH] sched: Make sure task has correct sched_class after policy
	change

>From the code in rt_mutex_setprio(), it is evident that the intention
is that task's with a RT 'prio' value as a consequence of receiving a PI
boost also have their 'sched_class' field set to '&rt_sched_class'.
However, the code in __setscheduler() could result in this intention
being frustrated.

This patch fixes this problem.

Signed-off-by: Peter Williams <pwil3058@...pond.net.au>

diff --git a/kernel/sched.c b/kernel/sched.c
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -6159,6 +6159,8 @@ __setscheduler(struct rq *rq, struct tas
 	p->normal_prio = normal_prio(p);
 	/* we are holding p->pi_lock already */
 	p->prio = rt_mutex_getprio(p);
+	if (rt_prio(p->prio))
+		p->sched_class = &rt_sched_class;
 	set_load_weight(p);
 }
 
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