From mboxrd@z Thu Jan 1 00:00:00 1970 Received: with ECARTIS (v1.0.0; list linux-mips); Sat, 13 Dec 2003 22:27:14 +0000 (GMT) Received: from mail.jlokier.co.uk ([IPv6:::ffff:81.29.64.88]:60547 "EHLO mail.shareable.org") by linux-mips.org with ESMTP id ; Sat, 13 Dec 2003 22:27:11 +0000 Received: from mail.shareable.org (localhost [127.0.0.1]) by mail.shareable.org (8.12.8/8.12.8) with ESMTP id hBDMQQcT020351; Sat, 13 Dec 2003 22:26:26 GMT Received: (from jamie@localhost) by mail.shareable.org (8.12.8/8.12.8/Submit) id hBDMQQmH020349; Sat, 13 Dec 2003 22:26:26 GMT 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 Return-Path: X-Envelope-To: <"|/home/ecartis/ecartis -s linux-mips"> (uid 0) X-Orcpt: rfc822;linux-mips@linux-mips.org Original-Recipient: rfc822;linux-mips@linux-mips.org X-archive-position: 3763 X-ecartis-version: Ecartis v1.0.0 Sender: linux-mips-bounce@linux-mips.org Errors-to: linux-mips-bounce@linux-mips.org X-original-sender: jamie@shareable.org Precedence: bulk X-list: linux-mips 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