Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750893Ab1DUEIT (ORCPT ); Thu, 21 Apr 2011 00:08:19 -0400 Received: from terminus.zytor.com ([198.137.202.10]:37128 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750701Ab1DUEIS (ORCPT ); Thu, 21 Apr 2011 00:08:18 -0400 Message-ID: <4DAFAD9F.4020809@zytor.com> Date: Wed, 20 Apr 2011 21:07:59 -0700 From: "H. Peter Anvin" User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.15) Gecko/20110403 Fedora/3.1.9-6.fc15 Thunderbird/3.1.9 MIME-Version: 1.0 To: David Rientjes CC: Clemens Ladisch , Ingo Molnar , Thomas Gleixner , x86@kernel.org, linux-kernel@vger.kernel.org Subject: Re: [patch v2] x86: allow ZONE_DMA to be configurable References: <4DA82F33.7080403@ladisch.de> <4DA8A5CE.2010004@zytor.com> In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1243 Lines: 32 On 04/20/2011 07:31 PM, David Rientjes wrote: >> >> This isn't really a very good edit, as ZONE_DMA isn't inherently limited >> to ISA/LPC devices (and LPC devices which do LPC-native bus mastering >> DMA are not affected.) ZONE_DMA is used even for some PCI devices which >> have restrictions on the DMA address mask. >> > > Peter, do you think we can merge this patch now? The discussion from > October resulted in the decision to rename CONFIG_EMBEDDED to > CONFIG_EXPERT and make CONFIG_GENERIC_ISA_DMA and CONFIG_ISA_DMA_API > configurable for x86. That's all been done via the -mm tree and is in the > latest git. > > We've run without ZONE_DMA for a few years without issues (and, obviously, > this patch) on x86. Please address the documentation issues. ZONE_DMA is *NOT* just for "old ISA devices" -- there are plenty of other devices with restricted DMA masks. -hpa -- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf. -- 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/