From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754535AbXLHUcq (ORCPT ); Sat, 8 Dec 2007 15:32:46 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752954AbXLHUcb (ORCPT ); Sat, 8 Dec 2007 15:32:31 -0500 Received: from outpipe-village-512-1.bc.nu ([81.2.110.250]:58871 "EHLO the-village.bc.nu" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1752728AbXLHUca (ORCPT ); Sat, 8 Dec 2007 15:32:30 -0500 Date: Sat, 8 Dec 2007 20:26:31 +0000 From: Alan Cox To: "David P. Reed" Cc: Andi Kleen , linux-kernel@vger.kernel.org, Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" Subject: Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops Message-ID: <20071208202631.14b0f768@the-village.bc.nu> In-Reply-To: <475AEF8E.5040906@reed.com> References: <475879CD.9080006@reed.com> <20071207160439.71b7f46a@the-village.bc.nu> <475AEF8E.5040906@reed.com> X-Mailer: Claws Mail 2.10.0 (GTK+ 2.10.14; i386-redhat-linux-gnu) Organization: Red Hat UK Cyf., Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SL4 1TE, Y Deyrnas Gyfunol. Cofrestrwyd yng Nghymru a Lloegr o'r rhif cofrestru 3798903 Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > In any case, my machine does not have an ISA bus. Why should it? It's > a laptop! Yes it does. The branding spec said "No ISA bus" so it was renamed "LPC" and hidden internally, but its alive and well. > has already serviced the bus and delivered data! Why put many > microseconds into the bus, locking out other ISA transactions (and PCI > maybe too) with an out to port 80? Historically processors didn't have a high precision time source so it was the normal way to do it on all PC operating systems > Some of the code in linux is really nice, really clean, really > well-thought out. Some is ... well, I'm not trolling for a fight. Like all things, it doesn't always age well 8)