Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757619AbYFMVEY (ORCPT ); Fri, 13 Jun 2008 17:04:24 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753325AbYFMVEO (ORCPT ); Fri, 13 Jun 2008 17:04:14 -0400 Received: from mx2.mail.elte.hu ([157.181.151.9]:49506 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753121AbYFMVDt (ORCPT ); Fri, 13 Jun 2008 17:03:49 -0400 Date: Fri, 13 Jun 2008 23:02:57 +0200 From: Ingo Molnar To: David Brownell Cc: Lior Dotan , Adrian Bunk , "Rafael J. Wysocki" , a.zummo@towertech.it, Linux Kernel Mailing List , bugme-daemon@bugzilla.kernel.org, rtc-linux@googlegroups.com Subject: Re: [Bug 10866] /dev/rtc was missing until I disabled CONFIG_RTC_CLASS Message-ID: <20080613210257.GA529@elte.hu> References: <20080613193302.GA1716@cs181133002.pp.htv.fi> <200806131343.41213.david-b@pacbell.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200806131343.41213.david-b@pacbell.net> User-Agent: Mutt/1.5.18 (2008-05-17) X-ELTE-VirusStatus: clean X-ELTE-SpamScore: -1.5 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-1.5 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.2.3 -1.5 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1660 Lines: 38 * David Brownell wrote: > On Friday 13 June 2008, Lior Dotan wrote: > > I don't know if it helps you to decide but the way I got to this > > configuration is by copying my working 2.6.25 .config file and running > > make oldconfig. I think this scenario is common when upgrading to a > > newer version so you should make sure it doesn't generate an invalid > > configuration. > > It doesn't! "No /dev/rtc" is a perfectly valid config. [...] The bug scenario is rather simple: /dev/rtc existed with that config in prior kernels and now, after "make oldconfig" it does not exist, it's a plain regression and must be fixed. > And it's not uncommon that new kernels require config tweaks. that's wrong - 'make oldconfig' must work smoothly and in an expected way. If you argue that the new kernel should come up with a non-existent /dev/rtc, then you are wrong and you go against established regression handling policies of the kernel. Smooth migration via "make oldconfig" is a must, otherwise we'd lose testers and users. The old /dev/rtc might indeed have been unbelievably "bad" in various ways and you dont even want to think about that code now, but it's your code now that is used so you might as well think about the other 98% of users who used the old /dev/rtc with old kernels. (not because they wanted to use bad code, but because simply that was the default) Ingo -- 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/