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

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Message-ID: <20081105090102.GB9141@elte.hu>
Date:	Wed, 5 Nov 2008 10:01:02 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jonathan Corbet <corbet@....net>
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


* Jonathan Corbet <corbet@....net> wrote:

> 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.

definitely worth a comment.

	Ingo
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