From: Peter Zijlstra <peterz@infradead.org>
To: Oleg Nesterov <oleg@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>, Ben Blum <bblum@google.com>,
Jiri Slaby <jirislaby@gmail.com>,
Lai Jiangshan <laijs@cn.fujitsu.com>,
Li Zefan <lizf@cn.fujitsu.com>, Miao Xie <miaox@cn.fujitsu.com>,
Paul Menage <menage@google.com>,
"Rafael J. Wysocki" <rjw@sisk.pl>, Tejun Heo <tj@kernel.org>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/6] move_task_off_dead_cpu: take rq->lock around select_fallback_rq()
Date: Wed, 24 Mar 2010 16:41:24 +0100 [thread overview]
Message-ID: <1269445284.5109.360.camel@twins> (raw)
In-Reply-To: <20100315091010.GA9131@redhat.com>
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);
next prev parent reply other threads:[~2010-03-24 15:41 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-15 9:10 [PATCH 2/6] move_task_off_dead_cpu: take rq->lock around select_fallback_rq() Oleg Nesterov
2010-03-24 15:41 ` Peter Zijlstra [this message]
2010-03-24 16:07 ` Oleg Nesterov
2010-03-24 16:17 ` Peter Zijlstra
2010-03-24 16:33 ` Oleg Nesterov
2010-03-26 9:06 ` Peter Zijlstra
2010-04-02 19:12 ` [tip:sched/core] sched: move_task_off_dead_cpu(): Take " tip-bot for Oleg Nesterov
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