From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753329AbYJFOBj (ORCPT ); Mon, 6 Oct 2008 10:01:39 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752004AbYJFOBa (ORCPT ); Mon, 6 Oct 2008 10:01:30 -0400 Received: from earthlight.etchedpixels.co.uk ([81.2.110.250]:46441 "EHLO lxorguk.ukuu.org.uk" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751939AbYJFOBa (ORCPT ); Mon, 6 Oct 2008 10:01:30 -0400 Date: Mon, 6 Oct 2008 15:01:22 +0100 From: Alan Cox To: Arjan van de Ven Cc: Maxim Levitsky , linux-kernel@vger.kernel.org Subject: Re: RFC: banning device driver reserved resources from /dev/mem Message-ID: <20081006150122.3860cae1@lxorguk.ukuu.org.uk> In-Reply-To: <20081006065213.76dc729a@infradead.org> References: <20081005180154.7cc12486@infradead.org> <20081006102739.16d1a434@lxorguk.ukuu.org.uk> <48EA1540.8060409@gmail.com> <20081006144835.6e58f73a@lxorguk.ukuu.org.uk> <20081006065213.76dc729a@infradead.org> X-Mailer: Claws Mail 3.5.0 (GTK+ 2.12.12; x86_64-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 > > Only a tiny fraction of devices in the world are PCI, and those > > platforms where you most what /dev/mem type debugging tools are often > > those without PCI > > if you looked at the patch it's x86 only, and only active if you set > CONFIG_STRICT_DEVMEM. > (if you don't select CONFIG_STRICT_DEVMEM, which is off by default, you > get unlimited access as usualy) Lots of non PCI devices on x86 systems as well. And the video problem is a big one for the x86 case as the VGA ISA window is used by both the kernel and X without a helper driver. Alan