linux-kernel - Re: NULL pointer dereference while setting sched_rt_period

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Date:	Wed, 18 Jun 2008 09:48:31 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Dario Faggioli <raistlin@...ux.it>
Cc:	Michael Trimarchi <trimarchimichael@...oo.it>, mingo@...e.hu,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: NULL pointer dereference while setting sched_rt_period_us

On Wed, 2008-06-18 at 09:18 +0200, Dario Faggioli wrote:
> Hi all,

Thanks! I'll push it fwd with my other rt-group fixes

> We think the following patch solves the issue.
> 
> Hope this is of some help.
> 
> Regards,
> Dario Faggioli
> 
> Signed-off-by: Dario Faggioli <raistlin@...ux.it>
> Signed-off-by: Michael Trimarchi <trimarchimichael@...oo.it>
> ---
> diff --git a/kernel/sched.c b/kernel/sched.c
> index eaf6751..7205e25 100644
> --- a/kernel/sched.c
> +++ b/kernel/sched.c
> @@ -8348,7 +8348,7 @@ static unsigned long to_ratio(u64 period, u64
> runtime)
>  #ifdef CONFIG_CGROUP_SCHED
>  static int __rt_schedulable(struct task_group *tg, u64 period, u64
> runtime)
>  {
> -	struct task_group *tgi, *parent = tg->parent;
> +	struct task_group *tgi, *parent = tg ? tg->parent : NULL;
>  	unsigned long total = 0;
>  
>  	if (!parent) {
> 

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