From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Sun, 20 May 2001 21:07:38 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Sun, 20 May 2001 21:07:28 -0400 Received: from pizda.ninka.net ([216.101.162.242]:63389 "EHLO pizda.ninka.net") by vger.kernel.org with ESMTP id ; Sun, 20 May 2001 21:07:21 -0400 From: "David S. Miller" MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <15112.27206.4123.40450@pizda.ninka.net> Date: Sun, 20 May 2001 18:07:17 -0700 (PDT) To: Andrea Arcangeli Cc: Andrew Morton , Ivan Kokshaysky , Richard Henderson , linux-kernel@vger.kernel.org Subject: Re: alpha iommu fixes In-Reply-To: <20010520191206.A30738@athlon.random> In-Reply-To: <20010519231131.A2840@jurassic.park.msu.ru> <20010520044013.A18119@athlon.random> <3B07AF49.5A85205F@uow.edu.au> <20010520154958.E18119@athlon.random> <20010520181803.I18119@athlon.random> <3B07EEFE.43DDBA5C@uow.edu.au> <20010520184411.K18119@athlon.random> <3B07F6B8.4EAB0142@uow.edu.au> <20010520191206.A30738@athlon.random> X-Mailer: VM 6.75 under 21.1 (patch 13) "Crater Lake" XEmacs Lucid Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Andrea Arcangeli writes: > > [..] Even sparc64's fancy > > iommu-based pci_map_single() always succeeds. > > Whatever sparc64 does to hide the driver bugs you can break it if you > pci_map 4G+1 bytes of phyical memory. Which is an utterly stupid thing to do. Please construct a plausable situation where this would occur legally and not be a driver bug, given the maximum number of PCI busses and slots found on sparc64 and the maximum _concurrent_ usage of PCI dma space for any given driver (which isn't doing something stupid). Later, David S. Miller davem@redhat.com