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Message-ID: <20111018130843.170b71b2@lxorguk.ukuu.org.uk> Date: Tue, 18 Oct 2011 13:08:43 +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 On Tue, 18 Oct 2011 06:59:28 -0500 Rob Clark <rob.clark@...aro.org> wrote: > On Tue, Oct 18, 2011 at 5:45 AM, Alan Cox <alan@...rguk.ukuu.org.uk> wrote: > >> 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. > > no, what I'm trying to avoid is having two virtual mappings to the > same physical page with different cache attributes. This is not > allowed on some architectures (like ARM) Nor x86... that's a matter for the core architecture code to deal with not the drivers. Alan -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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