Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755098AbXJPEMB (ORCPT ); Tue, 16 Oct 2007 00:12:01 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750758AbXJPELv (ORCPT ); Tue, 16 Oct 2007 00:11:51 -0400 Received: from dsl081-033-126.lax1.dsl.speakeasy.net ([64.81.33.126]:50554 "EHLO bifrost.lang.hm" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750721AbXJPELv (ORCPT ); Tue, 16 Oct 2007 00:11:51 -0400 Date: Mon, 15 Oct 2007 21:15:43 -0700 (PDT) From: david@lang.hm X-X-Sender: dlang@asgard.lang.hm To: Matthew Wilcox cc: Greg KH , Rob Landley , Julian Calaby , Theodore Tso , James Bottomley , linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, Jens Axboe , Suparna Bhattacharya , Nick Piggin Subject: Re: What still uses the block layer? In-Reply-To: <20071016040401.GA15744@parisc-linux.org> Message-ID: References: <200710112011.22000.rob@landley.net> <200710150304.00901.rob@landley.net> <646765f40710150206j75af4c4dwac4f4565451b64b1@mail.gmail.com> <200710150508.37332.rob@landley.net> <20071015173357.GB5738@kroah.com> <20071016040401.GA15744@parisc-linux.org> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1531 Lines: 32 On Mon, 15 Oct 2007, Matthew Wilcox wrote: > On Mon, Oct 15, 2007 at 07:54:22PM -0700, david@lang.hm wrote: >> do PCI devices reorder their bus numbers spontaniously, or only if you >> change the hardware? > > The only system I've had that reordered PCI bus numbers was when I had a > partitionable system and changed the partitioning. Not quite "change > the hardware", but neither was it "spontaneous". It was certainly > unexpected (for me). Ok, I would class that as the equivalent of 'changing the hardware'. > Greg probably has quite different examples. I would definantly be interested in hearing some of them. Greg's comment makes it sound like this is something that (with modern hardware) could happen to anyone at any time (which, if true, would be sufficiant to require 'best effort' nameing of devices for everything), while my experiance is that if the hardware is static (i.e. you don't plugin or unplug PCI devices) the numbering of exisitng PCI devices and buses is static. and while I understand that consumer distros want to have everything 'best effort' named to make it easier for users, I disagree that this should force everyone to use 'best effort' when there are many situations where it's unnessasary overhead and chances for errors. David Lang - 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/