From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 908CEC433E6 for ; Wed, 15 Jul 2020 12:11:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 71BB02065D for ; Wed, 15 Jul 2020 12:11:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1594815098; bh=rIjcU5BPnmY4uK3zj+p+fgmUWHz7mKvqX7fU0IC1020=; h=References:In-Reply-To:From:Date:Subject:To:Cc:List-ID:From; b=i+dFmtIo023jacdk1qK99UP0bbOZD8mxe3E6zF/W4Xu/NkRt51Jz7UcDex/plZ7JX cc4yAAAgTdi/O/SdEiAtbmuod6xFSVwulPDRDvRfVOckjMt9HuqkcMKJmO3sQlDiuC qJ0isk0uSPJ7YOxGGHlWV90nZ/kbchytkS6w5LBE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730852AbgGOMLh convert rfc822-to-8bit (ORCPT ); Wed, 15 Jul 2020 08:11:37 -0400 Received: from mail-ot1-f68.google.com ([209.85.210.68]:42544 "EHLO mail-ot1-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728801AbgGOMLg (ORCPT ); Wed, 15 Jul 2020 08:11:36 -0400 Received: by mail-ot1-f68.google.com with SMTP id g37so1250187otb.9; Wed, 15 Jul 2020 05:11:36 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=3cag8LrwMjM3xe6EZSlrz4EBUBRpTmPKD/ABz0zsn30=; b=jEJzl2u/jvooFwgPzbcGNhIyAKUL/N2Uxdfo3SoIEnEI0D1Eml/Lm/8fSkBiGPFWWZ YktRJGKZ1Se099A+RQmwzuquJfJWr2Ahnor2Lvqs84gePsruUtA7XfX3V8LoKuodHIzz GiEMCzFLwEaI6UDww6jtA5tQlZgmfXMkP4e76HPakFXZUmgyVuDVBycGFRC2TIvzEVXG 9Or/xTN63OCbReUII5LU6xVPHcodco1bybCAmwquseQ7+oMDPLKr6uBsBggwGxRABZLq GPM5zIIgLYrmSO2FBxfaS47h8rU0ZDk93JjXZ5GdAKdDi3rJIEFH8V+C77hbXr8xdR8A B7pQ== X-Gm-Message-State: AOAM530boF05xDlLhMRvjKfQCc2T03vQuJaMi/bt3UgACQ4Up1oG/gPz 91hyVbbYLEj+D6CdnXP5y79W2CfG3rBgfcm/Crk= X-Google-Smtp-Source: ABdhPJwHW42/HPcNLnkN0GUVwuSkpH45wKSqeoBtesXsaKKCMSGwCyfwn0t0YZsdDwmvmoGpSB8/H5RWdVb+nY27lUg= X-Received: by 2002:a9d:590a:: with SMTP id t10mr8619498oth.262.1594815095838; Wed, 15 Jul 2020 05:11:35 -0700 (PDT) MIME-Version: 1.0 References: <20200714145049.2496163-1-lee.jones@linaro.org> <20200714145049.2496163-10-lee.jones@linaro.org> <20200714210340.GJ1398296@dell> <20200715032442.gh2cliiddhv35fdj@vireshk-i7> <20200715032718.2zlo2eurhkpoayya@vireshk-i7> <20200715113433.GB3165313@dell> <20200715115029.GC3165313@dell> <20200715120742.GD3165313@dell> In-Reply-To: <20200715120742.GD3165313@dell> From: "Rafael J. Wysocki" Date: Wed, 15 Jul 2020 14:11:24 +0200 Message-ID: Subject: Re: [PATCH 09/13] cpufreq: acpi-cpufreq: Remove unused ID structs To: Lee Jones Cc: "Rafael J. Wysocki" , Viresh Kumar , "Rafael J. Wysocki" , Linux ARM , Linux Kernel Mailing List , Linux PM , Dominik Brodowski Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jul 15, 2020 at 2:07 PM Lee Jones wrote: > > On Wed, 15 Jul 2020, Lee Jones wrote: > > > On Wed, 15 Jul 2020, Rafael J. Wysocki wrote: > > > > > On Wed, Jul 15, 2020 at 1:34 PM Lee Jones wrote: > > > > > > > > On Wed, 15 Jul 2020, Rafael J. Wysocki wrote: > > > > > > > > > On Wed, Jul 15, 2020 at 5:27 AM Viresh Kumar wrote: > > > > > > > > > > > > On 15-07-20, 08:54, Viresh Kumar wrote: > > > > > > > On 14-07-20, 22:03, Lee Jones wrote: > > > > > > > > On Tue, 14 Jul 2020, Rafael J. Wysocki wrote: > > > > > > > > > > > > > > > > > On Tue, Jul 14, 2020 at 4:51 PM Lee Jones wrote: > > > > > > > > > > > > > > > > > > > > Can't see them being used anywhere and the compiler doesn't complain > > > > > > > > > > that they're missing, so ... > > > > > > > > > > > > > > > > > > Aren't they needed for automatic module loading in certain configurations? > > > > > > > > > > > > > > > > Any idea how that works, or where the code is for that? > > > > > > > > > > > > > > The MODULE_DEVICE_TABLE() thingy creates a map of vendor-id, > > > > > > > product-id that the kernel keeps after boot (and so there is no static > > > > > > > reference of it for the compiler), later when a device is hotplugged > > > > > > > into the kernel it refers to the map to find the related driver for it > > > > > > > and loads it if it isn't already loaded. > > > > > > > > > > > > > > This has some of it, search for MODULE_DEVICE_TABLE() in it. > > > > > > > Documentation/driver-api/usb/hotplug.rst > > > > > > > > > > > > And you just need to add __maybe_unused to them to suppress the > > > > > > warning. > > > > > > > > > > Wouldn't that cause the compiler to optimize them away if it doesn't > > > > > see any users? > > > > > > > > It looks like they're only unused when !MODULE, > > > > > > OK > > > > > > > in which case optimising them away would be the correct thing to do, no? > > > > It would be good if someone with a little more knowledge could provide > > a second opinion though. I would think (hope) that the compiler would > > be smart enough to see when its actually in use. After all, it is the > > compiler that places the information into the device table. > > > > If that is not the case, then the MODULE_DEVICE_TABLE() magic is > > broken and will need fixing. Removing boiler-plate is good, but not > > at the expense of obfuscation. > > Okay, I'm satisfied. This test build is without __maybe_unused: > > # All configs built as modules (MODULE) - the compiler knows to use the tables > > $ ccache make -f Makefile -j24 KBUILD_OUTPUT=../builds/build-x86 allmodconfig > $ ccache make -f Makefile -j24 KBUILD_OUTPUT=../builds/build-x86 W=1 drivers/cpufreq/ > [...] > CC [M] drivers/cpufreq/pcc-cpufreq.o > > # All configs built-in (!MODULE) - the compiler sees that they are unused > > $ ccache make -f Makefile -j24 KBUILD_OUTPUT=../builds/build-x86 allyesconfig > $ ccache make -f Makefile -j24 KBUILD_OUTPUT=../builds/build-x86 W=1 drivers/cpufreq/ > CC drivers/cpufreq/pcc-cpufreq.o > drivers/cpufreq/pcc-cpufreq.c:619:36: warning: ‘processor_device_ids’ defined but not used [-Wunused-const-variable=] > 619 | static const struct acpi_device_id processor_device_ids[] = { > | ^~~~~~~~~~~~~~~~~~~~ > OK I thought that this would be the case. :-) From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2D433C433E1 for ; Wed, 15 Jul 2020 12:12:58 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id F00E52065D for ; Wed, 15 Jul 2020 12:12:57 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="y8jf+uvC" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org F00E52065D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:To:Subject:Message-ID:Date:From:In-Reply-To: References:MIME-Version:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=8Q8rGA7cEd2BFFS0kCiJyndzyplpyT9ZVdVkCZzjmMI=; b=y8jf+uvCLYcZMS/4nGgQlZC2H 55ran8CCZ2kB0k/C6zhpZFtGKWOpOUiSk3uBNKAs3bRksQmrq8wCy6745qT2fcUlRqLwRKaNlHfAp AXus88ZfygBxZ0mmiQ7hySG/xXBvkyr2giYSam3P6vhKqCVbeEVcyRMs2p1HVv4YxEBl+iYOFq9ZR bluGP0cDgK95ZMt4ocjoUQzUBcEdjCuMMdf/rR3EWHZepXvQK9jksUcwSCph4BNDwX57GVr+KDPQs a1Tbz4bd6ZtD58WxH7hx8qQY7mJY4NDPuzELReKlwde4hFvHOol3ArEavNP6wYpz1ydTpiDNiLld7 3cp2R8sMA==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jvgGC-0006oT-1V; Wed, 15 Jul 2020 12:11:40 +0000 Received: from mail-ot1-f65.google.com ([209.85.210.65]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jvgG8-0006nP-V7 for linux-arm-kernel@lists.infradead.org; Wed, 15 Jul 2020 12:11:37 +0000 Received: by mail-ot1-f65.google.com with SMTP id t18so1266994otq.5 for ; Wed, 15 Jul 2020 05:11:36 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=3cag8LrwMjM3xe6EZSlrz4EBUBRpTmPKD/ABz0zsn30=; b=QnRSjt3ZhclTfTQVMIttmogjJpcYzApZ+6Q6+dvGzvVpnqtNEK1gp87jSua8Ry8GWP Q9wIfa1WhcTPUtrmqv0atgPSQ/roS1H4d+jLltRFJr6QdRBJ3rXtI8DleyAeA5nHsx8H TnjRXJM4urWTEM2NXcsT7oM41gDN6SzICMKsLH3a+awPDHhhsO/7gJDFGtbY2eV/TPjd PXynP3+KzXHmxPxc3NJr+zB0/OFITZ8g0GYIxeLWBUMx1Q3VhiAD/93ZnHDz8Ks21M6W kuy1ZpOehFlNaP+YfpVg1MIsFYI/NM3xweCkKqy+xNkpb+94g0UX8KmjVsmkEqSO6ZB3 NKmA== X-Gm-Message-State: AOAM532drv5HfW+NpuCD2r8MptAqIbbEbvC710fBxyK7NfhFKjVvDGg0 A960xinmBnzWNszwj9pkk7XK2YrmoqJL/cwqQDo= X-Google-Smtp-Source: ABdhPJwHW42/HPcNLnkN0GUVwuSkpH45wKSqeoBtesXsaKKCMSGwCyfwn0t0YZsdDwmvmoGpSB8/H5RWdVb+nY27lUg= X-Received: by 2002:a9d:590a:: with SMTP id t10mr8619498oth.262.1594815095838; Wed, 15 Jul 2020 05:11:35 -0700 (PDT) MIME-Version: 1.0 References: <20200714145049.2496163-1-lee.jones@linaro.org> <20200714145049.2496163-10-lee.jones@linaro.org> <20200714210340.GJ1398296@dell> <20200715032442.gh2cliiddhv35fdj@vireshk-i7> <20200715032718.2zlo2eurhkpoayya@vireshk-i7> <20200715113433.GB3165313@dell> <20200715115029.GC3165313@dell> <20200715120742.GD3165313@dell> In-Reply-To: <20200715120742.GD3165313@dell> From: "Rafael J. Wysocki" Date: Wed, 15 Jul 2020 14:11:24 +0200 Message-ID: Subject: Re: [PATCH 09/13] cpufreq: acpi-cpufreq: Remove unused ID structs To: Lee Jones X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200715_081137_046946_A3C63FED X-CRM114-Status: GOOD ( 30.92 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Linux PM , Viresh Kumar , "Rafael J. Wysocki" , "Rafael J. Wysocki" , Linux Kernel Mailing List , Linux ARM , Dominik Brodowski Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gV2VkLCBKdWwgMTUsIDIwMjAgYXQgMjowNyBQTSBMZWUgSm9uZXMgPGxlZS5qb25lc0BsaW5h cm8ub3JnPiB3cm90ZToKPgo+IE9uIFdlZCwgMTUgSnVsIDIwMjAsIExlZSBKb25lcyB3cm90ZToK Pgo+ID4gT24gV2VkLCAxNSBKdWwgMjAyMCwgUmFmYWVsIEouIFd5c29ja2kgd3JvdGU6Cj4gPgo+ ID4gPiBPbiBXZWQsIEp1bCAxNSwgMjAyMCBhdCAxOjM0IFBNIExlZSBKb25lcyA8bGVlLmpvbmVz QGxpbmFyby5vcmc+IHdyb3RlOgo+ID4gPiA+Cj4gPiA+ID4gT24gV2VkLCAxNSBKdWwgMjAyMCwg UmFmYWVsIEouIFd5c29ja2kgd3JvdGU6Cj4gPiA+ID4KPiA+ID4gPiA+IE9uIFdlZCwgSnVsIDE1 LCAyMDIwIGF0IDU6MjcgQU0gVmlyZXNoIEt1bWFyIDx2aXJlc2gua3VtYXJAbGluYXJvLm9yZz4g d3JvdGU6Cj4gPiA+ID4gPiA+Cj4gPiA+ID4gPiA+IE9uIDE1LTA3LTIwLCAwODo1NCwgVmlyZXNo IEt1bWFyIHdyb3RlOgo+ID4gPiA+ID4gPiA+IE9uIDE0LTA3LTIwLCAyMjowMywgTGVlIEpvbmVz 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