linux-kernel - Re: [PATCH 1/8] Fix rt_rq->pushable_tasks initialization in init_rt

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Message-Id: <1247136184.9777.364.camel@twins>
Date:	Thu, 09 Jul 2009 12:43:04 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Fabio Checconi <fchecconi@...il.com>
Cc:	mingo@...e.hu, linux-kernel@...r.kernel.org,
	Gregory Haskins <ghaskins@...ell.com>
Subject: Re: [PATCH 1/8] Fix rt_rq->pushable_tasks initialization in
 init_rt_rq()

On Mon, 2009-06-15 at 20:56 +0200, Fabio Checconi wrote:
> init_rt_rq() initializes only rq->rt.pushable_tasks, and not the
> pushable_tasks field of the passed rt_rq.  The plist is not used
> uninitialized since the only pushable_tasks plists used are the
> ones of root rt_rqs; anyway reinitializing the list on every group
> creation corrupts the root plist, losing its previous contents.
> 
> Signed-off-by: Fabio Checconi <fabio@...dalf.sssup.it>

Good catch, I'll queue this up.

> ---
>  kernel/sched.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/kernel/sched.c b/kernel/sched.c
> index 6032f51..873b252 100644
> --- a/kernel/sched.c
> +++ b/kernel/sched.c
> @@ -9075,7 +9075,7 @@ static void init_rt_rq(struct rt_rq *rt_rq, struct rq *rq)
>  #ifdef CONFIG_SMP
>  	rt_rq->rt_nr_migratory = 0;
>  	rt_rq->overloaded = 0;
> -	plist_head_init(&rq->rt.pushable_tasks, &rq->lock);
> +	plist_head_init(&rt_rq->pushable_tasks, &rq->lock);
>  #endif
>  
>  	rt_rq->rt_time = 0;

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