linux-kernel - Re: [PATCH 1/1]: Thaws refrigerated bdi flusher threads before invoking kthread

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Date:	Wed, 11 Nov 2009 11:34:44 +0100
From:	Pavel Machek <pavel@....cz>
To:	Romit Dasgupta <romit@...com>
Cc:	jens.axboe@...cle.com, rjw@...k.pl, linux-kernel@...r.kernel.org,
	linux-omap@...r.kernel.org, linux-pm@...ts.linux-foundation.org
Subject: Re: [PATCH 1/1]: Thaws refrigerated bdi flusher threads before
 invoking kthread_stop on them

On Wed 2009-11-11 14:00:16, Romit Dasgupta wrote:
> Kicks out frozen bdi flusher task out of the refrigerator when the flusher task
> needs to exit.


> Signed-off-by: Romit Dasgupta <romit@...com>

Ok, its slightly "interesting", but better than modifying common
code. Looks ok to me.

ACK.
								Pavel

> ---
> diff --git a/mm/backing-dev.c b/mm/backing-dev.c
> index 5a37e20..c757b05 100644
> --- a/mm/backing-dev.c
> +++ b/mm/backing-dev.c
> @@ -606,8 +606,11 @@ static void bdi_wb_shutdown(struct backing_dev_info *bdi)
>  	 * Finally, kill the kernel threads. We don't need to be RCU
>  	 * safe anymore, since the bdi is gone from visibility.
>  	 */
> -	list_for_each_entry(wb, &bdi->wb_list, list)
> +	list_for_each_entry(wb, &bdi->wb_list, list) {
> +		if (unlikely(frozen(wb->task)))
> +			wb->task->flags &= ~PF_FROZEN;
>  		kthread_stop(wb->task);
> +	}
>  }
>  
>  void bdi_unregister(struct backing_dev_info *bdi)
> 

-- 
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