From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754143AbcBHT3X (ORCPT ); Mon, 8 Feb 2016 14:29:23 -0500 Received: from mail.linuxfoundation.org ([140.211.169.12]:53646 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752997AbcBHT3V (ORCPT ); Mon, 8 Feb 2016 14:29:21 -0500 Date: Mon, 8 Feb 2016 11:29:20 -0800 From: Greg Kroah-Hartman To: Darren Hart Cc: Pali =?iso-8859-1?Q?Roh=E1r?= , =?utf-8?B?TWljaGHFgiBLxJlwaWXFhA==?= , Matthew Garrett , Richard Purdie , Jacek Anaszewski , platform-driver-x86@vger.kernel.org, linux-leds@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 00/16] Common Dell SMBIOS API Message-ID: <20160208192920.GA10110@kroah.com> References: <1453472848-3118-1-git-send-email-kernel@kempniu.pl> <20160122144851.GN7192@pali> <20160208192014.GN1779@malice.jf.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20160208192014.GN1779@malice.jf.intel.com> User-Agent: Mutt/1.5.24 (2015-08-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Feb 08, 2016 at 11:20:14AM -0800, Darren Hart wrote: > On Fri, Jan 22, 2016 at 03:48:51PM +0100, Pali Rohár wrote: > > On Friday 22 January 2016 15:27:12 Michał Kępień wrote: > > > Note: > > > > > > In this series (both v1 and v2) I tried to stick to the overall > > > concept used in dell-laptop, but in the v1 thread me and Pali also > > > briefly discussed his alternative ideas [1][2] as to what this API > > > could look like, so feel free to suggest a different approach. > > > > > > [1] http://www.spinics.net/lists/platform-driver-x86/msg08260.html > > > [2] http://www.spinics.net/lists/platform-driver-x86/msg08268.html > > > > I would like to hear opinion about dell-smbios API also from other > > people. Darren, can you look and comment it? > > This is an excellently prepared series, nice work Michał. > > Most of my concerns were addressed by later patches in the series. I have pushed > a version of this 1/7 fixed per lkp (linux/io.h) and 7/16 with a corrected body > as I sent in reply to that patch. This is on my tree as the dell-smbios branch. > > My only major concern is module load order dependencies. Inter-module > dependencies are frowned upon with good reason, the kernel load ordering is > non-deterministic and it's possible, for example, for dell-laptop to fail to > find the symbols exported by dell-smbios under certain conditions. > > I have worked around this in the past with things like the following: > > #ifdef MODULE > #ifdef CONFIG_FOO_MODULE > if (request_module("foo")) > return -ENODEV; > #endif > #endif > > Something like the above may be necessary for dell-smbios in dell-laptop, > dell-wmi, and dell-leds now that they depend on the dell-smbios exported > functions. > > Cc Greg in case there is a better way to handle this that I'm not aware of. No need to request_module anything, the symbol resolution should pull the dependant module in automagically when you do a 'modprobe', otherwise the symbols would never be found. thanks, greg k-h