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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 747CBC433FE for ; Mon, 16 May 2022 13:10:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238258AbiEPNK2 (ORCPT ); Mon, 16 May 2022 09:10:28 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49298 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230259AbiEPNK1 (ORCPT ); Mon, 16 May 2022 09:10:27 -0400 Received: from mail-oi1-x22d.google.com (mail-oi1-x22d.google.com [IPv6:2607:f8b0:4864:20::22d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4195013E83; Mon, 16 May 2022 06:10:26 -0700 (PDT) Received: by mail-oi1-x22d.google.com with SMTP id l16so18519550oil.6; Mon, 16 May 2022 06:10:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=sender:date:from:to:cc:subject:message-id:references:mime-version :content-disposition:content-transfer-encoding:in-reply-to; bh=CaF92eBKzl8YhqaTS1Tzg7cnBN+wgBVFhVH+tqOT7PI=; b=q0OW4Ll0d1esJg4Bsi1gSdlTXNns+dyRXpjhWwy3TYP4n4qr8/NV4nZJZKjjduBKRi cA/1ac5Z/Sme7x9B3srXyZPtmX5SKG2ovm3cO9mWg1RmnkOoPJ3oT1jhhOpvYVxSxOtK EETC7rAwge3lFdAza0DWk9nk5BgdUO+u4Mgw7bEh4ZYJNK3Aeh9oPPg2Ig7eRjDoosqU UzYV1++XIwCfe0WO0MlnNE9IF9nupMaem9yK2ia5n1v/9WBmbIxEnxV0yjVXGEaFXtPd F/Q36d9JPkZFcTSysTH5PQ0es9AeN0p4TfoGPkBlB9oAT02H+Hc1mjA9INBnW3qT0TLE TCwA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:sender:date:from:to:cc:subject:message-id :references:mime-version:content-disposition :content-transfer-encoding:in-reply-to; bh=CaF92eBKzl8YhqaTS1Tzg7cnBN+wgBVFhVH+tqOT7PI=; b=7TmJduZbUEHSqwC6DA75Om5r7KUL4xteBvFna1nsjVqNcEvNXsfw2eoDswjTK8JOsC n1HTVKPZbgpS9KCGTxtfhw7dcVVnKTV4Scrmawb9dFIXNUyGrqtzvoVymeKKpQ60M3tz JjyVhsdr7LyHudh8PdrrQejIUiJTZwZi/4oy/nnE88PhmhgAuktM+WYpTs8gJskOjbF4 ciWFS8OnVk2L9yAMH6/RlJ0TOj0P796XFI6NE1El0LvMI2nRrlKninTVOBFEGvWLZzTJ mCT5uA7OSNsaYsq79HTlrz9Ao3PSpAYXr8nf/jjeu7QC06XaOYjr2ixHgw+8S4iVjLpL PyeA== X-Gm-Message-State: AOAM533T1UxYQtBz0aW5iXGa2TXNWdyISHGp2k8/vs1LuVX9bERFbpyx Ec1FDzvWJ+B0SJ68AvbmRfs= X-Google-Smtp-Source: ABdhPJzuSlHddEfPdlSooNCiKn9gKqW9iethwrrpTKVRacgUq5xfLq0fJvrzlLVkrWbJmB72AUE4Hw== X-Received: by 2002:a05:6808:148a:b0:326:c71a:f33c with SMTP id e10-20020a056808148a00b00326c71af33cmr12758233oiw.153.1652706625572; Mon, 16 May 2022 06:10:25 -0700 (PDT) Received: from server.roeck-us.net ([2600:1700:e321:62f0:329c:23ff:fee3:9d7c]) by smtp.gmail.com with ESMTPSA id r3-20020acac103000000b00325cda1ff95sm3795450oif.20.2022.05.16.06.10.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 16 May 2022 06:10:24 -0700 (PDT) Sender: Guenter Roeck Date: Mon, 16 May 2022 06:10:23 -0700 From: Guenter Roeck To: Arnd Bergmann Cc: linux-kbuild@vger.kernel.org, Arnd Bergmann , Linus Torvalds , Masahiro Yamada , llvm@lists.linux.dev, Jonathan Corbet , Federico Vaga , Alex Shi , Hu Haowen , Michal Marek , Nick Desaulniers , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc-tw-discuss@lists.sourceforge.net, linux-arm-kernel@lists.infradead.org, intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, greybus-dev@lists.linaro.org, linux-staging@lists.linux.dev, linux-btrfs@vger.kernel.org Subject: Re: [PATCH] [v2] Kbuild: move to -std=gnu11 Message-ID: <20220516131023.GA2329080@roeck-us.net> References: <20220228103142.3301082-1-arnd@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20220228103142.3301082-1-arnd@kernel.org> Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org On Mon, Feb 28, 2022 at 11:27:43AM +0100, Arnd Bergmann wrote: > From: Arnd Bergmann > > During a patch discussion, Linus brought up the option of changing > the C standard version from gnu89 to gnu99, which allows using variable > declaration inside of a for() loop. While the C99, C11 and later standards > introduce many other features, most of these are already available in > gnu89 as GNU extensions as well. The downside is that backporting affected patches to older kernel branches now fails with error messages such as mm/kfence/core.c: In function ‘kfence_init_pool’: mm/kfence/core.c:595:2: error: ‘for’ loop initial declarations are only allowed in C99 or C11 mode Just something to keep in mind when writing patches. Guenter