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

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Message-ID: <878wylayiw.fsf@basil.nowhere.org>
Date:	Thu, 08 May 2008 12:19:35 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Rene Herman <rene.herman@...access.nl>
Cc:	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

Rene Herman <rene.herman@...access.nl> writes:
>
> Use a new Linux defined X86_FEATURE_PAT_GOOD feature flag to

Better would be PAT_TESTED or PAT_RANDOMLY_APPROVED.
Most of these CPUs without PAT_GOOD have actually perfectly good PAT, as 
Windows proves every day.

The main flaw in all of this of course is that there is no procedure to test
CPUs which do not have the flag set yet.

-Andi

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