linux-kernel - Re: [git pull] IO mappings, #2

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Date:	Tue, 4 Nov 2008 15:36:53 -0700
From:	Jonathan Corbet <corbet@....net>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Keith Packard <keithp@...thp.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Dave Airlie <airlied@...ux.ie>,
	Yinghai Lu <yinghai@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [git pull] IO mappings, #2

Having looked at this some, I have one, tiny little suggestion:

> +With this mapping object, individual pages can be mapped either
> atomically +or not, depending on the necessary scheduling
> environment. Of course, atomic +maps are more efficient:
> +
> +	void *io_mapping_map_atomic_wc(struct io_mapping *mapping,
> +				       unsigned long offset)

Should the documentation for this function (perhaps the
certainly-forthcoming kerneldoc comments :) mention loudly that this
function uses KM_USER0?  This isn't kmap(), and doesn't look much like
it; someday some developer might get an ugly surprise when they try to
use that slot simultaneously for something else.

jon
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