Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757416AbZJLRdl (ORCPT ); Mon, 12 Oct 2009 13:33:41 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757363AbZJLRdk (ORCPT ); Mon, 12 Oct 2009 13:33:40 -0400 Received: from terminus.zytor.com ([198.137.202.10]:57420 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757338AbZJLRdk (ORCPT ); Mon, 12 Oct 2009 13:33:40 -0400 Message-ID: <4AD36723.5040502@zytor.com> Date: Mon, 12 Oct 2009 10:28:03 -0700 From: "H. Peter Anvin" User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.1) Gecko/20090814 Fedora/3.0-2.6.b3.fc11 Thunderbird/3.0b3 MIME-Version: 1.0 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 References: <20091011103302.62bded41@infradead.org> In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1537 Lines: 34 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 > AuthorDate: Sun, 11 Oct 2009 10:33:02 -0700 > Committer: Ingo Molnar > 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/