linux-kernel - Re: [tip:x86/pat] x86: Relegate CONFIG_PAT and CONFIG

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Message-ID: <4AD36723.5040502@zytor.com>
Date:	Mon, 12 Oct 2009 10:28:03 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	mingo@...hat.com, hpa@...or.com, linux-kernel@...r.kernel.org,
	arjan@...ux.intel.com, torvalds@...ux-foundation.org,
	arjan@...radead.org, hmh@....eng.br, rdreier@...co.com,
	tglx@...utronix.de, mingo@...e.hu
CC:	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/pat] x86: Relegate CONFIG_PAT and CONFIG_MTRR configurability
 to EMBEDDED

On 10/12/2009 04:10 AM, tip-bot for Arjan van de Ven wrote:
> Commit-ID:  c03cb3149daed3e411657e3212d05ae27cf1a874
> Gitweb:     http://git.kernel.org/tip/c03cb3149daed3e411657e3212d05ae27cf1a874
> Author:     Arjan van de Ven <arjan@...radead.org>
> AuthorDate: Sun, 11 Oct 2009 10:33:02 -0700
> Committer:  Ingo Molnar <mingo@...e.hu>
> CommitDate: Mon, 12 Oct 2009 13:06:57 +0200
> 
> x86: Relegate CONFIG_PAT and CONFIG_MTRR configurability to EMBEDDED
> 
> MTRR and PAT support (which got added to CPUs over 10 years ago)
> are no longer really optional in that more and more things are
> depending on PAT just working, including various drivers and newer
> versions of X.  (to not even speak of MTRR)
> 
> Having this as a regular config option just no longer makes sense.
> 
> This patch relegates CONFIG_X86_PAT to the EMBEDDED category so
> ultra-embedded can still disable it if they really need to.
> 

Should we combine this with removing the whitelist (which is largely
vestigial at this point) and replace it with a blacklist (possibly
empty)?  I still haven't seen any evidence that there are any CPUs which
have problems, and PAT support go back all the way to Pentium III -- and
page table attributes can be used all the way back to 386, it just
excludes the WC type.

	-hpa
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