From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S264238AbTLMW1N (ORCPT ); Sat, 13 Dec 2003 17:27:13 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S264556AbTLMW1N (ORCPT ); Sat, 13 Dec 2003 17:27:13 -0500 Received: from mail.jlokier.co.uk ([81.29.64.88]:60803 "EHLO mail.shareable.org") by vger.kernel.org with ESMTP id S264238AbTLMW1M (ORCPT ); Sat, 13 Dec 2003 17:27:12 -0500 Date: Sat, 13 Dec 2003 22:26:26 +0000 From: Jamie Lokier To: Peter Horton Cc: linux-mips@linux-mips.org, linux-kernel@vger.kernel.org Subject: Re: Possible shared mapping bug in 2.4.23 (at least MIPS/Sparc) Message-ID: <20031213222626.GA20153@mail.shareable.org> References: <20031213114134.GA9896@skeleton-jack> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20031213114134.GA9896@skeleton-jack> User-Agent: Mutt/1.4.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Peter Horton wrote: > A quick look at sparc and sparc64 seem to show the same problem. D-cache incoherence with unsuitably aligned multiple MAP_FIXED mappings is also observed on SH4, SH5, PA-RISC 1.1d. The kernel may have the same behaviour on those platforms: allowing a mapping that should not be allowed. On some ARM and m68k boxes, incoherence is observed independent of alignment, for multiple mappings of a page in the same user memory space. -- Jamie