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From: Tejun Heo <tj@kernel.org>
To: "weiqi@kylinos.com.cn" <weiqi@kylinos.com.cn>
Cc: torvalds <torvalds@linux-foundation.org>,
	linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: race condition in schedule_on_each_cpu()
Date: Fri, 7 Jun 2013 16:22:19 -0700	[thread overview]
Message-ID: <20130607232219.GK14781@mtj.dyndns.org> (raw)
In-Reply-To: <51B14472.60904@kylinos.com.cn>

On Fri, Jun 07, 2013 at 10:24:50AM +0800, weiqi@kylinos.com.cn wrote:
> >Before the commit you originally quoted, the calling thread could be
> preempted and migrated to another CPU before get_online_cpus() thus
> ending up executing the function twice on the new cpu but skipping the
> old one.
> 
> does this situation will happen in "Full preemption" config, on 3.0.30-rt50?

Sure, if the fix hasn't been backported.

Thanks.

-- 
tejun

  reply	other threads:[~2013-06-07 23:22 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <tencent_0777D84B54B4163A3B85255A@qq.com>
2013-06-06 21:23 ` Tejun Heo
2013-06-07  1:34   ` weiqi
2013-06-07  2:24     ` weiqi
2013-06-07 23:22       ` Tejun Heo [this message]
     [not found]         ` <51B27744.6090507@kylinos.com.cn>
2013-06-08 11:30           ` weiqi
     [not found] <51A7FFE8.6060204@kylinos.com.cn>
     [not found] ` <20130531023246.GD30479@mtj.dyndns.org>
     [not found]   ` <51A821F3.1000605@kylinos.com.cn>
2013-05-31  5:03     ` Tejun Heo

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