Date: Wed, 5 Nov 2008 10:01:02 +0100
From: Ingo Molnar <mingo@elte.hu>
To: Jonathan Corbet <corbet@lwn.net>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
       Keith Packard <keithp@keithp.com>,
       Jesse Barnes <jbarnes@virtuousgeek.org>,
       Nick Piggin <nickpiggin@yahoo.com.au>, Dave Airlie <airlied@linux.ie>,
       Yinghai Lu <yinghai@kernel.org>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [git pull] IO mappings, #2
Message-ID: <20081105090102.GB9141@elte.hu>
References: <20081022093615.GF12453@elte.hu> <1224746087-13991-1-git-send-email-keithp@keithp.com> <20081023080553.GB14714@elte.hu> <1224776350.6738.14.camel@koto.keithp.com> <21d7e9970811022300o2576b437kb35a55e2751889f6@mail.gmail.com> <alpine.LFD.2.00.0811030833340.3459@nehalem.linux-foundation.org> <20081103165319.GA27433@elte.hu> <20081103172951.GA7929@elte.hu> <20081104153653.4b785480@bike.lwn.net>
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* Jonathan Corbet <corbet@lwn.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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