linux-kernel - Re: [PATCH] flush_cpu_workqueue: don't flush an empty ->worklist

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Message-ID: <20070109164604.GA17915@in.ibm.com>
Date:	Tue, 9 Jan 2007 22:16:04 +0530
From:	Srivatsa Vaddagiri <vatsa@...ibm.com>
To:	Oleg Nesterov <oleg@...sign.ru>
Cc:	Andrew Morton <akpm@...l.org>, David Howells <dhowells@...hat.com>,
	Christoph Hellwig <hch@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...l.org>,
	linux-kernel@...r.kernel.org, Gautham shenoy <ego@...ibm.com>
Subject: Re: [PATCH] flush_cpu_workqueue: don't flush an empty ->worklist

On Tue, Jan 09, 2007 at 07:38:15PM +0300, Oleg Nesterov wrote:
> We can't do this. We should thaw cwq->thread (which was bound to the
> dead CPU) to complete CPU_DEAD event. So we still need some changes.

I noticed that, but I presumed kthread_stop() will post a wakeup which
will bring it out of frozen state. Looking at refrigerator(), I realize
that is not possible. 

So CPU_DEAD should do a thaw_process on the kthread before doing a
kthread_stop?

-- 
Regards,
vatsa
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