linux-kernel - Re: [PATCH 2/6] move_task_off_dead_cpu: take rq->lock around select_fallback

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Message-ID: <1269445284.5109.360.camel@twins>
Date:	Wed, 24 Mar 2010 16:41:24 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Ben Blum <bblum@...gle.com>,
	Jiri Slaby <jirislaby@...il.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Li Zefan <lizf@...fujitsu.com>,
	Miao Xie <miaox@...fujitsu.com>,
	Paul Menage <menage@...gle.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Tejun Heo <tj@...nel.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/6] move_task_off_dead_cpu: take rq->lock around
 select_fallback_rq()

On Mon, 2010-03-15 at 10:10 +0100, Oleg Nesterov wrote:
>  static void move_task_off_dead_cpu(int dead_cpu, struct task_struct *p)
>  {
> +       struct rq *rq = cpu_rq(dead_cpu);
> +       int needs_cpu, dest_cpu;
> +       unsigned long flags;
>  again:
> +       local_irq_save(flags);
> +
> +       raw_spin_lock(&rq->lock);
> +       needs_cpu = (task_cpu(p) == dead_cpu) && (p->state != TASK_WAKING);

                                       ^ 
kernel/sched.c:5445: warning: ‘dest_cpu’ may be used uninitialized in this function

> +       if (needs_cpu)
> +               dest_cpu = select_fallback_rq(dead_cpu, p); 
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