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

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Date:	Tue, 5 Apr 2016 05:56:30 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Ming Lei <tom.leiming@...il.com>
Cc:	Jens Axboe <axboe@...com>, linux-kernel@...r.kernel.org,
	linux-block@...r.kernel.org, Christoph Hellwig <hch@...radead.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()

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.