linux-kernel - Re: [PATCH, RFC] reimplement flush

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Message-ID: <20070105085634.GB18088@in.ibm.com>
Date:	Fri, 5 Jan 2007 14:26:34 +0530
From:	Srivatsa Vaddagiri <vatsa@...ibm.com>
To:	Andrew Morton <akpm@...l.org>
Cc:	Oleg Nesterov <oleg@...sign.ru>,
	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, RFC] reimplement flush_workqueue()

On Thu, Jan 04, 2007 at 09:18:50AM -0800, Andrew Morton wrote:
> This?

This can still lead to the problem spotted by Oleg here:

	http://lkml.org/lkml/2006/12/30/37

and you would need a similar patch he posted there.

>  void fastcall flush_workqueue(struct workqueue_struct *wq)
>  {
> -	mutex_lock(&workqueue_mutex);
> +	preempt_disable();		/* CPU hotplug */
>  	if (is_single_threaded(wq)) {
>  		/* Always use first cpu's area. */
>  		flush_cpu_workqueue(per_cpu_ptr(wq->cpu_wq, singlethread_cpu));
> @@ -459,7 +463,7 @@ void fastcall flush_workqueue(struct wor
>  		for_each_online_cpu(cpu)
>  			flush_cpu_workqueue(per_cpu_ptr(wq->cpu_wq, cpu));
>  	}
> -	mutex_unlock(&workqueue_mutex);
> +	preempt_enable();
>  }
>  EXPORT_SYMBOL_GPL(flush_workqueue);

-- 
Regards,
vatsa
-
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