linux-kernel - RE: [PATCH 10/10] x86-32: panic on !CX8 && XMM

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Message-ID: <SNT125-W19438E1E5A7FB2F02097DEC3480@phx.gbl>
Date:	Wed, 17 Feb 2010 15:00:25 -0800
From:	Yuhong Bao <yuhongbao_386@...mail.com>
To:	<hpa@...or.com>, <luca@...a-barbieri.com>
CC:	<mingo@...e.hu>, <a.p.zijlstra@...llo.nl>,
	<akpm@...ux-foundation.org>, <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 10/10] x86-32: panic on !CX8 && XMM

> NAK in the extreme.
>
> This is not how we deal with these kinds of stuff. If this really
> matters, we explicitly clear the CPU feature in the feature detect code.
Also, don't forget the NT4 CX8 bug with non-Intel/AMD/Cyrix vendors:
http://www.geoffchappell.com/studies/windows/km/cpu/cx8.htm
If a processor support SSE (or PAE or MMX for that matter), you can pretty much assume CX8 exists even if the feature bit is cleared because of this bug.

Yuhong Bao

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