From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760981AbZAUNUu (ORCPT ); Wed, 21 Jan 2009 08:20:50 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755410AbZAUNUm (ORCPT ); Wed, 21 Jan 2009 08:20:42 -0500 Received: from cantor2.suse.de ([195.135.220.15]:59197 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755273AbZAUNUl (ORCPT ); Wed, 21 Jan 2009 08:20:41 -0500 Date: Wed, 21 Jan 2009 14:20:36 +0100 From: Nick Piggin To: Suresh Siddha Cc: mingo@elte.hu, hpa@zytor.com, tglx@linutronix.de, torvalds@linux-foundation.org, yinghai@kernel.org, venkatesh.pallipadi@intel.com, akpm@linux-foundation.org, arjan@infradead.org, linux-kernel@vger.kernel.org, jaswinderlinux@gmail.com, just.for.lkml@googlemail.com Subject: Re: [patch] x86: fix page attribute corruption with cpa() Message-ID: <20090121132036.GU24891@wotan.suse.de> References: <20090120222021.GB28352@linux-os.sc.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20090120222021.GB28352@linux-os.sc.intel.com> User-Agent: Mutt/1.5.9i Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jan 20, 2009 at 02:20:21PM -0800, Suresh B wrote: > This patch fixes a performance issue reported by Linus on his > Nehalem system. While Linus reverted the PAT patch (commit > 58dab916dfb57328d50deb0aa9b3fc92efa248ff) which exposed the issue, > existing cpa() code can potentially still cause wrong(page attribute > corruption) behavior. > > This patch also fixes the "WARNING: at arch/x86/mm/pageattr.c:560" that > various people reported. This doesn't seem to show up any more after running the system for some time, so I think it's fixed here. Thanks! > > --- > From: Suresh Siddha > Subject: x86: fix page attribute corruption with cpa()