Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756443AbYAIST7 (ORCPT ); Wed, 9 Jan 2008 13:19:59 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756551AbYAISTt (ORCPT ); Wed, 9 Jan 2008 13:19:49 -0500 Received: from terminus.zytor.com ([198.137.202.10]:41082 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756549AbYAISTr (ORCPT ); Wed, 9 Jan 2008 13:19:47 -0500 Message-ID: <47850FE3.2040001@zytor.com> Date: Wed, 09 Jan 2008 10:18:11 -0800 From: "H. Peter Anvin" User-Agent: Thunderbird 2.0.0.9 (X11/20071115) MIME-Version: 1.0 To: Zachary Amsden CC: Rene Herman , Christer Weinigel , "David P. Reed" , Avi Kivity , Ondrej Zary , Bodo Eggert <7eggert@gmx.de>, Ingo Molnar , Alan Cox , Paul Rolland , Pavel Machek , Thomas Gleixner , linux-kernel@vger.kernel.org, Ingo Molnar , rol Subject: Re: [linux-kernel] Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override. References: <9BdU5-1YW-9@gated-at.bofh.it> <200801081810.58904.linux@rainbow-software.org> <4783B1B2.6070005@reed.com> <200801081838.16241.linux@rainbow-software.org> <4783C4A6.9060402@reed.com> <20080108185120.3ff7ed18@lxorguk.ukuu.org.uk> <4783CBD9.7020709@reed.com> <1199847162.7369.323.camel@bodhitayantram.eng.vmware.com> <20080109063052.48a5709c@weinigel.se> <4784E7E1.4060308@keyaccess.nl> <1199902644.7369.355.camel@bodhitayantram.eng.vmware.com> In-Reply-To: <1199902644.7369.355.camel@bodhitayantram.eng.vmware.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 911 Lines: 24 Zachary Amsden wrote: > > I'm speaking specifically in terms of 64-bit platforms here. Shouldn't > we unconditionally drop outb_p doing extra port I/O on 64-bit > architectures? Especially considering they don't even have an ISA bus > where the decode timing could even matter? > Why should the bitsize of the CPU matter for this? It seems one of the less meaningful keys for this. Second, as I have mentioned, I don't believe this is really the case, especially not for the PIT, which is still present -- the PIT *semantics* has explicit timing constraints. Third, you still have ISA devices, they're just called LPC or PC104 devices these days. -hpa -- 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/