linux-kernel - Re: [PATCH 0/1] aoe: ensure we initialise the request

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Date:	Tue, 1 Sep 2009 15:15:20 -0400
From:	Ed Cashin <ecashin@...aid.com>
To:	bonbons@...ux-vserver.org, ecashin@...aid.com, apw@...onical.com,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/1] aoe: ensure we initialise the request_queue correctly

On Sat Aug 29 09:43:54 EDT 2009, bonbons@...ux-vserver.org wrote:
...
> I finished bisecting the NULL object and ended up at this commit:
>   cd43e26f071524647e660706b784ebcbefbd2e44
> 
>   block: Expose stacked device queues in sysfs
> 
>   Currently stacking devices do not have a queue directory in sysfs.
>   However, many of the I/O characteristics like sector size, maximum
>   request size, etc. are queue properties.
> 
>   This patch enables the queue directory for MD/DM devices.  The elevator
>   code has been modified to deal with queues that do not have an I/O
>   scheduler.
> 
>   Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
>   Signed-off-by: Jens Axboe <jens.axboe@...cle.com>
> 
> 
> This seems to generate /sys/block/$device/queue and its contents for
> everyone who is using queues, not just for those queues that have a
> non-NULL queue->request_fn.

Thanks much for doing that.  It makes sense that this change would
have caused it to suddenly matter whether the unused queue is
initialized.

The patch looks fine to me.

I don't think it should go in my aoe tree for linux-next, since the
patch addresses a regression.

Based on the series file in mmotm, I don't think this patch is in mm
at the moment.  Andrew Morton, do you think this patch should go
through your mm tree?

-- 
  Ed
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