linux-kernel - Re: [PATCH RESEND] block: Don't check QUEUE_FLAG_SAME_COMP in __blk_complete

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Date:	Thu, 15 Sep 2011 07:17:28 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Tao Ma <tm@....ma>
Cc:	Shaohua Li <shli@...nel.org>, linux-kernel@...r.kernel.org,
	Jens Axboe <jaxboe@...ionio.com>
Subject: Re: [PATCH RESEND] block: Don't check QUEUE_FLAG_SAME_COMP in
 __blk_complete_request.

On Thu, Sep 15, 2011 at 10:16:02AM +0800, Tao Ma wrote:
> > why not delete bio_set_completion_cpu()?
> Not sure. It is added in commit c7c22e4d from the very beginning, and in
> the commit log Jens described it as:
> A bio helper (bio_set_completion_cpu()) is also added, so that queuers
> can ask for completion on that specific CPU. Maybe it is obsolete.
> Anyway, I am fine to generate a patch to remove it if you prefer.
> > 1. nobody uses it in my search
> yes, but it may be designed for someone to use it. The same goes with
> BIO_CPU_AFFINE.

This code is unused, and from the all the discussions lately pretty
obviously broken.  The only thing keeping it serves is creating more
confusion and possibly more bugs.

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