linux-kernel - Re: MTRR use in drivers

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Message-ID: <51C7725C.5090801@zytor.com>
Date:	Sun, 23 Jun 2013 15:10:36 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Henrique de Moraes Holschuh <hmh@....eng.br>
CC:	Brice Goglin <brice.goglin@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	David Airlie <airlied@...ux.ie>,
	dri-devel@...ts.freedesktop.org
Subject: Re: MTRR use in drivers

On 06/23/2013 02:56 PM, Henrique de Moraes Holschuh wrote:
> 
> And as far as I could find from Intel's not-that-complete public
> "specification updates", we are applying the errata workaround to a few more
> processors than strictly required, but since I have no idea how to write a
> test case, I can't whitelist the 3rd-gen Pentium M on my T43, nor can I get
> ThinkPad owners to test it for us on 1st and 2nd-gen Pentium M and report
> back.
> 

Which specific erratum are you referring to, here?  The "WC becomes UC"
erratum?  I don't think there is a sane testcase for it since it needs a
very complicated setup to trigger.

	-hpa

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