From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752784AbbKYNW7 (ORCPT ); Wed, 25 Nov 2015 08:22:59 -0500 Received: from mail-wm0-f45.google.com ([74.125.82.45]:33379 "EHLO mail-wm0-f45.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751672AbbKYNW4 (ORCPT ); Wed, 25 Nov 2015 08:22:56 -0500 Subject: Re: [PATCH 1/3] clocksource: defbool CLKSRC_QCOM=y on ARCH_QCOM and make it visible To: Arnd Bergmann References: <1448413710-8101-1-git-send-email-sboyd@codeaurora.org> <3550727.W9y7mWx54D@wuerfel> <5655ABA1.6030206@linaro.org> <2558718.Gz71lz6d4y@wuerfel> Cc: linux-arm-kernel@lists.infradead.org, Stephen Boyd , linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, Andy Gross From: Daniel Lezcano Message-ID: <5655B62D.6090309@linaro.org> Date: Wed, 25 Nov 2015 14:22:53 +0100 User-Agent: Mozilla/5.0 (X11; Linux i686; rv:38.0) Gecko/20100101 Thunderbird/38.3.0 MIME-Version: 1.0 In-Reply-To: <2558718.Gz71lz6d4y@wuerfel> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 11/25/2015 01:49 PM, Arnd Bergmann wrote: > On Wednesday 25 November 2015 13:37:53 Daniel Lezcano wrote: >> On 11/25/2015 11:17 AM, Arnd Bergmann wrote: >>> On Wednesday 25 November 2015 11:10:49 Daniel Lezcano wrote: >>>> On 11/25/2015 02:08 AM, Stephen Boyd wrote: >>>>> We want to remove the ARCH_MSM* configs in mach-qcom/Kconfig >>>>> because they are mostly proxy configs for selecting the right >>>>> clocksource driver. Therefore, make CLKSRC_QCOM default to the >>>>> value of ARCH_QCOM, but also make it visible if ARCH_QCOM=y so >>>>> that we can turn it off when we don't want it. >>>> >>>> I have been removing the ARCH dependencies in the Kconfig file. >>>> >>>> Why do you have to turn it off manually ? >>> >>> The background is that this is used only on some of the older >>> MSM SoCs, while the newer ones use the arch timer. >>> >>> We decided to remove the SoC-specific top-level options from >>> mach-msm as they are becoming rather meaningless these days >>> and just a burden to maintain at the rate that new variants >>> get released, so being able to turn off this driver helps make >>> the kernel slightly smaller if you are building a kernel for >>> only the more recent models. >> >> Ok, thanks for the clarification. >> >> I don't really like this approach even if it is correct because it >> breaks the current approach I am trying to make consistent across the >> drivers. >> >> I would like to have the COMPILE_TEST option available for all the >> drivers and move this option under the menu config. This patch will >> prevent to do this code factoring. > > How about moving the option to arch/arm/mach-qcom/Kconfig then? > > We could have a user-selectable "allow use of qcom clocksource" > option there, which would then select the driver. Yes, why not. >> On the other side, this option is supposed to have a slightly smaller >> kernel when it is not used. But when does it happen ? When >> ARCH_MSM8X60=n and ARCH_MSM8960=n. With this patchset, I don't see the >> ability to turn these SoCs off as the options are removed. So the >> associated code is not removed, right ? >> >> So why allow to turn off the timer but disallow that for the entire SoC ? > > The timer is the only code that is controlled by those two options at > the moment, all the other differences between SoCs are already handled > by enabling the respective device drivers. Ok, I see. Thanks. -- Daniel -- Linaro.org │ Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog