Date: Wed, 16 Jan 2008 00:11:40 +0100
From: Andi Kleen <andi@firstfloor.org>
To: Ingo Molnar <mingo@elte.hu>
Cc: "Siddha, Suresh B" <suresh.b.siddha@intel.com>,
       "Pallipadi, Venkatesh" <venkatesh.pallipadi@intel.com>,
       Andi Kleen <andi@firstfloor.org>, ebiederm@xmission.com,
       rdreier@cisco.com, torvalds@linux-foundation.org, gregkh@suse.de,
       airlied@skynet.ie, davej@redhat.com, tglx@linutronix.de,
       linux-kernel@vger.kernel.org, Arjan van de Ven <arjan@infradead.org>,
       jesse.barnes@intel.com
Subject: Re: [patch 02/11] PAT x86: Map only usable memory in x86_64 identity map and kernel text
Message-ID: <20080115231140.GA5967@one.firstfloor.org>
References: <p737iiho5yq.fsf@bingen.suse.de> <924EFEDD5F540B4284297C4DC59F3DEE5A2805@orsmsx423.amr.corp.intel.com> <20080110192808.GF747@one.firstfloor.org> <924EFEDD5F540B4284297C4DC59F3DEE5A28CE@orsmsx423.amr.corp.intel.com> <20080114164324.GH15542@elte.hu> <20080114212105.GB8903@linux-os.sc.intel.com> <20080115221758.GG2665@elte.hu>
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> 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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