linux-kernel - Re: [PATCH 26/27] kernel/power/swap.c: use bio_get_base

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Message-ID: <CACVXFVNScDZCt2weJBNU4JW9RYQjGftFwaQSBh=68wueCEDtvA@mail.gmail.com>
Date:	Tue, 5 Apr 2016 21:19:32 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Jens Axboe <axboe@...com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-block@...r.kernel.org, Boaz Harrosh <boaz@...xistor.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	"open list:SUSPEND TO RAM" <linux-pm@...r.kernel.org>
Subject: Re: [PATCH 26/27] kernel/power/swap.c: use bio_get_base_vec()

On Tue, Apr 5, 2016 at 8:56 PM, Christoph Hellwig <hch@...radead.org> wrote:
> I really don't like all these bio_get_base_vec uses.  The end_io
> handlers generall want to iterate over all pages in the bio, with
> a special case where all of them is the fixed number one.
>
> So What I think we'll need is a bio_for_each_page, and if there is
> any good justification for it as special version of the single
> page case.

I thought about that too, and bio_get_base_vec() can be thought as
the special version too, IMO.  Actually it is just about the name of
the helper, do you have a better name or other idea for such issue?

There are about ten such usages, as found in this patchset.


Thanks,
Ming Lei