linux-kernel - Re: [PATCH v2] block: use dedicated list iterator variable

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Message-ID: <a7b2fe8d-9967-2046-67a5-62d10e95a861@kernel.dk>
Date:   Thu, 31 Mar 2022 05:59:33 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Jakob Koschel <jakobkoschel@...il.com>
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        Bart Van Assche <bvanassche@....org>,
        Mike Rapoport <rppt@...nel.org>,
        Brian Johannesmeyer <bjohannesmeyer@...il.com>,
        Cristiano Giuffrida <c.giuffrida@...nl>,
        "Bos, H.J." <h.j.bos@...nl>
Subject: Re: [PATCH v2] block: use dedicated list iterator variable

On 3/31/22 3:12 AM, Jakob Koschel wrote:
> To move the list iterator variable into the list_for_each_entry_*()
> macro in the future it should be avoided to use the list iterator
> variable after the loop body.
> 
> To *never* use the list iterator variable after the loop it was
> concluded to use a separate iterator variable instead of a
> found boolean [1].

Not a huge fan of doing a helper for this single use, but I guess it
does make the main function easier to code. So I guess that's fine. But
can you move the call down where the result is checked?

qe = blk_lookup_qe_pair(head, q);
if (!qe)
	return;

I prefer no distance between call and check, makes it easier to read. I
can make the edit locally and note it in the commit message so you don't
have to re-send it. Let me know, or just resend a v3.

-- 
Jens Axboe