linux-kernel - Re: [patch 3/3] mm: introduce follow

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Message-ID: <20090504110841.GA19646@infradead.org>
Date:	Mon, 4 May 2009 07:08:41 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Magnus Damm <magnus.damm@...il.com>,
	linux-media@...r.kernel.org, Hans Verkuil <hverkuil@...all.nl>,
	Paul Mundt <lethal@...ux-sh.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 3/3] mm: introduce follow_pfn()

On Mon, May 04, 2009 at 11:54:34AM +0200, Johannes Weiner wrote:
> Analoguous to follow_phys(), add a helper that looks up the PFN
> instead.  It also only allows IO mappings or PFN mappings.

A kerneldoc describing what it does and the limitations would be
extremly helpful.

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