linux-kernel - Re: [patch V2 sched: Protect sched_rr_get_param access to task->sched

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Date:	Wed, 09 Dec 2009 09:33:56 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>
Subject: Re: [patch V2 sched: Protect sched_rr_get_param access to
 task->sched_class

On Wed, 2009-12-09 at 09:32 +0100, Thomas Gleixner wrote:
> sched_rr_get_param calls task->sched_class->get_rr_interval(task)
> without protection against a concurrent sched_setscheduler() call
> which modifies task->sched_class.
> 
> Serialize the access with task_rq_lock(task) and hand the rq pointer
> into get_rr_interval() as it's needed at least in the sched_fair
> implementation.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

Acked-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>

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