linux-kernel - Re: [BUG 2.6.25-rc3] scheduler/hotplug: some processes are dealocked when cpu is set to offline

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Message-Id: <20080307180959.41498329.akpm@linux-foundation.org>
Date:	Fri, 7 Mar 2008 18:09:59 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Suresh Siddha <suresh.b.siddha@...el.com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, dmitry.adamushko@...il.com,
	ego@...ibm.com, mingo@...e.hu, oleg@...sign.ru,
	yi.y.yang@...el.com, linux-kernel@...r.kernel.org,
	tglx@...utronix.de
Subject: Re: [BUG 2.6.25-rc3] scheduler/hotplug: some processes are
 dealocked when cpu is set to offline

On Fri, 7 Mar 2008 17:50:45 -0800 Suresh Siddha <suresh.b.siddha@...el.com> wrote:

> Andrew, Can you please try one more patch(appended) to see if it helps?
> 

Not until Monday, sorry - the offending machine is at work and (due to
this bug) cannot be woken via LAN.

> ---
> 
> diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
> index 0a6d2e5..8cb707c 100644
> --- a/kernel/sched_rt.c
> +++ b/kernel/sched_rt.c
> @@ -597,7 +597,7 @@ static int find_lowest_cpus(struct task_struct *task, cpumask_t *lowest_mask)
>  	int       count       = 0;
>  	int       cpu;
>  
> -	cpus_and(*lowest_mask, task_rq(task)->rd->online, task->cpus_allowed);
> +	cpus_and(*lowest_mask, task->cpus_allowed, cpu_online_map);
--
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