linux-kernel - Re: [patch 02/11] PAT x86: Map only usable memory in x86

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Message-ID: <20080115231140.GA5967@one.firstfloor.org>
Date:	Wed, 16 Jan 2008 00:11:40 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>,
	Andi Kleen <andi@...stfloor.org>, ebiederm@...ssion.com,
	rdreier@...co.com, torvalds@...ux-foundation.org, gregkh@...e.de,
	airlied@...net.ie, davej@...hat.com, tglx@...utronix.de,
	linux-kernel@...r.kernel.org,
	Arjan van de Ven <arjan@...radead.org>,
	jesse.barnes@...el.com
Subject: Re: [patch 02/11] PAT x86: Map only usable memory in x86_64 identity map and kernel text

> just to make sure i understood the attribute priorities right: we cannot 
> just mark it WB in the PAT and expect it to be write-back - the UC of 
> the MTRR will control?

There are different kinds of UC: UC+ and UC-. One controls the other doesn't.

-Andi
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