Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760417AbZANKU1 (ORCPT ); Wed, 14 Jan 2009 05:20:27 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757156AbZANKTh (ORCPT ); Wed, 14 Jan 2009 05:19:37 -0500 Received: from krynn.se.axis.com ([193.13.178.10]:37155 "EHLO krynn.se.axis.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753856AbZANKTg (ORCPT ); Wed, 14 Jan 2009 05:19:36 -0500 Date: Wed, 14 Jan 2009 11:18:51 +0100 From: Jesper Nilsson To: David Miller Cc: "kosaki.motohiro@jp.fujitsu.com" , "tj@kernel.org" , "gregkh@suse.de" , "stern@rowland.harvard.edu" , "jens.axboe@oracle.com" , "hinko.kocevar@cetrtapot.si" , "linux-kernel@vger.kernel.org" Subject: Re: lib/klist.c: bit 0 in pointer can't be used as flag Message-ID: <20090114101851.GE19262@axis.com> References: <20090113.131030.207355839.davem@davemloft.net> <20090113221235.GD19262@axis.com> <2f11576a0901131440w7fd3290uc9664aaf7aa89b08@mail.gmail.com> <20090113.144521.97357573.davem@davemloft.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20090113.144521.97357573.davem@davemloft.net> User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1044 Lines: 28 On Tue, Jan 13, 2009 at 11:45:21PM +0100, David Miller wrote: > From: KOSAKI Motohiro > Date: Wed, 14 Jan 2009 07:40:19 +0900 > > > > It may be that we've worked around the other spots, although I haven't > > > seen anything like that, we might just have been lucky until now. > > > > > > Can you recall another place where this trick is used? > > > > rmap. > > Don't CRIS use mmu? > > I'm beginning to suspect the issue is only with objects > in the kernel image itself. Dynamically allocated memory > is properly aligned and therefore the "low bit status bits > in pointer" trick works. Yes, that agrees with what I see here, and why we haven't seen this problem more often. /^JN - Jesper Nilsson -- Jesper Nilsson -- jesper.nilsson@axis.com -- 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/