From: "H. Peter Anvin" <hpa@zytor.com>
To: mingo@redhat.com, hpa@zytor.com, linux-kernel@vger.kernel.org,
arjan@linux.intel.com, torvalds@linux-foundation.org,
arjan@infradead.org, hmh@hmh.eng.br, rdreier@cisco.com,
tglx@linutronix.de, mingo@elte.hu
Cc: linux-tip-commits@vger.kernel.org
Subject: Re: [tip:x86/pat] x86: Relegate CONFIG_PAT and CONFIG_MTRR configurability to EMBEDDED
Date: Mon, 12 Oct 2009 10:28:03 -0700 [thread overview]
Message-ID: <4AD36723.5040502@zytor.com> (raw)
In-Reply-To: <tip-c03cb3149daed3e411657e3212d05ae27cf1a874@git.kernel.org>
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@infradead.org>
> AuthorDate: Sun, 11 Oct 2009 10:33:02 -0700
> Committer: Ingo Molnar <mingo@elte.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
next prev parent reply other threads:[~2009-10-12 17:33 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-11 15:43 [PATCH] x86: Relegate CONFIG_PAT to EMBEDDED Arjan van de Ven
2009-10-11 17:04 ` Roland Dreier
2009-10-11 17:19 ` Robert Hancock
2009-10-11 17:33 ` Arjan van de Ven
2009-10-11 18:47 ` Henrique de Moraes Holschuh
2009-10-12 11:10 ` [tip:x86/pat] x86: Relegate CONFIG_PAT and CONFIG_MTRR configurability " tip-bot for Arjan van de Ven
2009-10-12 17:28 ` H. Peter Anvin [this message]
2009-10-12 17:45 ` Arjan van de Ven
2009-10-12 17:56 ` Ingo Molnar
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