linux-kernel - Re: [git head] X86

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Message-Id: <1210398359.29406.169.camel@koto.keithp.com>
Date:	Fri, 09 May 2008 22:45:59 -0700
From:	Keith Packard <keith.packard@...el.com>
To:	Dave Airlie <airlied@...il.com>
Cc:	keith.packard@...el.com,
	Venki Pallipadi <venkatesh.pallipadi@...el.com>,
	Ingo Molnar <mingo@...e.hu>, Hugh Dickins <hugh@...itas.com>,
	Frans Pop <elendil@...net.nl>,
	Jesse Barnes <jesse.barnes@...el.com>,
	linux-kernel@...r.kernel.org, Yinghai Lu <yhlu.kernel@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Nick Piggin <npiggin@...e.de>,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Subject: Re: [git head] X86_PAT & mprotect

On Sat, 2008-05-10 at 08:11 +1000, Dave Airlie wrote:

> Wow this kinda puts X in a nasty position, we have 2.6.25 and previous kernels
> where we use the original /sys interfaces and nasty hack to
> workaround, but on 2.6.26 we magically need to
> switch to the /sys _uc interfaces or the users X will slow down.

It didn't sound like that to me -- using UC- should mean that if we set
up MTRRs correctly, we'll get WC access for our frame buffer. Did I miss
something here?

-- 
keith.packard@...el.com

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