linux-kernel - Re: [PATCH] [4/7] Don't use large pages to map the first 2/4MB of memory

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Message-ID: <20080321175936.GJ2346@one.firstfloor.org>
Date:	Fri, 21 Mar 2008 18:59:36 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Andi Kleen <andi@...stfloor.org>, andreas.herrmann3@....com,
	mingo@...e.hu, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [4/7] Don't use large pages to map the first 2/4MB of memory

> 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
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