From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030530AbXAYTiV (ORCPT ); Thu, 25 Jan 2007 14:38:21 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1030525AbXAYTiV (ORCPT ); Thu, 25 Jan 2007 14:38:21 -0500 Received: from rgminet01.oracle.com ([148.87.113.118]:14419 "EHLO rgminet01.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1030527AbXAYTiT (ORCPT ); Thu, 25 Jan 2007 14:38:19 -0500 Date: Thu, 25 Jan 2007 11:33:12 -0800 From: Randy Dunlap To: Kyle McMartin Cc: Seetharam Dharmosoth , linux-kernel@vger.kernel.org Subject: Re: que: How can we Eliminate the DMA Zone from the kernel? Message-Id: <20070125113312.830bbada.randy.dunlap@oracle.com> In-Reply-To: <20070125153510.GA13938@athena.road.mcmartin.ca> References: <161367.39134.qm@web7706.mail.in.yahoo.com> <20070125153510.GA13938@athena.road.mcmartin.ca> Organization: Oracle Linux Eng. X-Mailer: Sylpheed 2.3.0 (GTK+ 2.8.10; x86_64-unknown-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Whitelist: TRUE X-Whitelist: TRUE X-Brightmail-Tracker: AAAAAQAAAAI= Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 25 Jan 2007 10:35:10 -0500 Kyle McMartin wrote: > On Thu, Jan 25, 2007 at 12:56:30PM +0000, Seetharam Dharmosoth wrote: > > Hi, > > > > Want to remove DMA zone the from the Linux Kernel. > > (Don't want to use DMA Zone, because i am not > > using ISA bus, am using PCI bus. So, I don't need > > this) > > > > Just because you don't need ISA, doesn't mean you don't need > ZONE_DMA. Various PCI cards have limitations on what addresses they > can DMA to (24 bits on some old PCI sound cards iirc, and more recently > a 30 bit DMA limitation on some Broadcom networking equipment.) If your platform really doesn't need ZONE_DMA, then you should look at lots of discussion and patches on the linux-mm mailing list. See http://linux-mm.org/LinuxKernelMailingLists and emails or patches from Christoph Lameter, Andi Kleen, and Marcelo Tosatti. --- ~Randy