Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758242AbXETT6O (ORCPT ); Sun, 20 May 2007 15:58:14 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755781AbXETT6A (ORCPT ); Sun, 20 May 2007 15:58:00 -0400 Received: from mail1.sea5.speakeasy.net ([69.17.117.3]:46926 "EHLO mail1.sea5.speakeasy.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755552AbXETT57 (ORCPT ); Sun, 20 May 2007 15:57:59 -0400 Date: Sun, 20 May 2007 12:57:58 -0700 (PDT) From: Trent Piepho X-X-Sender: xyzzy@shell4.speakeasy.net To: Stefan Richter cc: Satyam Sharma , Adrian Bunk , Andrew Morton , Sam Ravnborg , LKML , Roman Zippel , Kumar Gala , Simon Horman Subject: Re: RFC: kconfig select warnings bogus? In-Reply-To: <465034AA.6030904@s5r6.in-berlin.de> Message-ID: References: <20070519151523.GA26724@uranus.ravnborg.org> <20070519230940.GJ6291@stusta.de> <465029F1.6090301@s5r6.in-berlin.de> <465034AA.6030904@s5r6.in-berlin.de> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1329 Lines: 47 On Sun, 20 May 2007, Stefan Richter wrote: > > >> Iterating upwards and downwards the dependency graph is the duty of > >> "make snafuconfig", not of the maintainers. > > ...multi-level dependencies are no problem for it. > > There is nothing wrong with > > A... depends on B > > B... depends on C > > # CONFIG_C is not set > > -> A is unavailable. select doesn't appear to work quite like this. For example: config A bool "A" config B bool "B" depends on A config C bool "C" select B In this case, it's possible to turn C on and A off. B will be on, even though it depends on A and A is off. The kconfig docs say that "B.. depends on A" sets the maximum value of B to be that of A. Since A=0, the max value of B is 0. The kconfig docs also say that "C.. select B" sets the minimum value of B to be that of C. Since C=2, the minimum value of B is 2. So we have B>=2 and B<=0, which is obviously impossible. Yet *config has no problem with this, and will set B=2 even the 'depends' means B must be 0. It seems like "select" will override any other dependencies. - 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/