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Subject: [PATCH] sched: Make sure task has correct sched_class after policy
	change
Message-Id: <3d53eba431b0afc691a4.1253671436@mudlark.pw.nest>
User-Agent: Mercurial-patchbomb/1.3
Date: Wed, 23 Sep 2009 02:03:56 -0000
From: Peter Williams <pwil3058@bigpond.net.au>
To: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>, Mike Galbraith <efault@gmx.de>,
       Linux Kernel Mailing <linux-kernel@vger.kernel.org>
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 979
Lines: 27

>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@bigpond.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(prio))
+		p->sched_class = &rt_sched_class;
 	set_load_weight(p);
 }
 
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