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Date: Fri, 21 Mar 2008 18:59:36 +0100
From: Andi Kleen <andi@firstfloor.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Andi Kleen <andi@firstfloor.org>, andreas.herrmann3@amd.com, mingo@elte.hu,
       linux-kernel@vger.kernel.org
Subject: Re: [PATCH] [4/7] Don't use large pages to map the first 2/4MB of memory
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> Also we split the first GB mapping anyway due to the various regions
> (NX, RO, UC) in there.

I didn't think so unless you have DEBUG_RODATA enabled?  Also there
should be no UC region there as known by the kernel. There might
be a WC region there from the frame buffer code, but that is an MTRR,
not a pageattr.

-Andi