linux-kernel - Re: [PATCH 34/49] gma500: the GEM and GTT code is device independant

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Message-ID: <20111018114518.5610a8c2@lxorguk.ukuu.org.uk>
Date:	Tue, 18 Oct 2011 11:45:18 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Rob Clark <rob.clark@...aro.org>
Cc:	Hugh Dickins <hughd@...gle.com>,
	Patrik Jakobsson <patrik.r.jakobsson@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Hellwig <hch@...radead.org>, greg@...ah.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 34/49] gma500: the GEM and GTT code is device
 independant

> What troubles could you see for swap+uncached (or more likely,
> writecombine) pages?

That should never occur. I would argue the driver is responsible for
putting the cache state of the page back sensibly before it unpins it.
That's a simple enough rule and one I think all the drivers follow at
this point.

Alan
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