linux-kernel - Re: [PATCH] x86: introduce a new Linux defined feature flag for PAT support

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Date:	Thu, 8 May 2008 16:32:50 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Rene Herman <rene.herman@...access.nl>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Adrian Bunk <bunk@...nel.org>,
	Yinghai Lu <yhlu.kernel@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	akpm@...ux-foundation.org, Pavel Machek <pavel@...e.cz>
Subject: Re: [PATCH] x86: introduce a new Linux defined feature flag for PAT
 support

> For old CPUs it is actually ok (after all they worked for years without
> PAT), I just don't like it for new CPUs. It's a bad idea there and
> in the x86 world it is a reasonable expectation that CPU features
> generally work.

Agreed 100%. We should default to assuming newer processors work. That
will be true in almost if not all cases anyway, and since it'll bite
anyone at Intel/AMD/.. testing new CPU steppings when it is on by default
any problem cases won't be leaving the labs.

Alan
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