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[209.132.180.67]) by mx.google.com with ESMTP id b92si2605415pjc.17.2019.07.31.17.26.48; Wed, 31 Jul 2019 17:27:03 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=XZTsUJ+D; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729374AbfGaX4B (ORCPT + 99 others); Wed, 31 Jul 2019 19:56:01 -0400 Received: from mail-lj1-f196.google.com ([209.85.208.196]:43517 "EHLO mail-lj1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726231AbfGaX4A (ORCPT ); Wed, 31 Jul 2019 19:56:00 -0400 Received: by mail-lj1-f196.google.com with SMTP id y17so42875067ljk.10 for ; Wed, 31 Jul 2019 16:55:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=C5QOeLk7yQQUtN6RiDUd1CkiFI0D44hl2RjrJZE5DIs=; b=XZTsUJ+D/jGUZ1cRRjm0rRM3/PwYaYhuJT5ThMenGwFPaUBiyxu/3O4MyCMZTok4gt XyyFl8PuN3ykZhan4tXfp9xUs1CP95/tBPnqInO9RTBMJyUjORUWntlkt3Hy1TRBdG4f EamlLG7kquBdyW4/URc31FNX+aodEJrRhTsiYSe0vJVjYUVeITOgeYVFA3neDUovNBj9 1NEmlwL9YGHCVFvC3/HhaQcOsWgHvjHQXOOiAjUksi3QOdY/RimFZcha/Ll0hLKF/KlT pll0Kfdpy5qjxvOQF5ka+DB+vJhn/PdWznPjvOrRLY9i48rMRTYfPMAJ7IL+lVzoBWkY pHrg== 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; bh=C5QOeLk7yQQUtN6RiDUd1CkiFI0D44hl2RjrJZE5DIs=; b=eQpCgoA6ZsBmFfE8zMe6nFrn65n824CbNAnq9b4fp+arjQwzk7i21VVDfz9p20mYw0 yjB3MEZQJ5V/JP35X70ML35cxSFC1NeLjZfS6S/OdDWojHJfh+foUHnr1fB8+Y7UQ4Bl veks9+JhT1LJ2mQeYu528xKXETlKn9t3BAMx46Mrpr52Lw45Cd9wOCoK0g29c7EWIBgE 7I/6NjRfW9ybdTIaO1dK1KhJyyx2BrnRlDz0v5JceAgwJUld+j/6R4A33uFoJlKHKXLt d9nkVG+BuGzjVQGqH+IWHO22cA1SiBhqv+/1x5KmuhqJAvFKPXKlfVov/g4Q871izQ8T WueQ== X-Gm-Message-State: APjAAAXECvftHyRMXvwepV8YYGkmwoasrIp4VhrQhkhSIwuceilL4rd8 5ncuSbqK0qqNQ8w40HGmHinGElkC/XpjDoqQsXY= X-Received: by 2002:a2e:8741:: with SMTP id q1mr13422620ljj.144.1564617358799; Wed, 31 Jul 2019 16:55:58 -0700 (PDT) MIME-Version: 1.0 References: <1d2830aadbe9d8151728a7df5b88528fc72a0095.1564549413.git.joe@perches.com> <20190731171429.GA24222@amd> <765E740C-4259-4835-A58D-432006628BAC@zytor.com> <20190731184832.GZ31381@hirez.programming.kicks-ass.net> In-Reply-To: From: Miguel Ojeda Date: Thu, 1 Aug 2019 01:55:47 +0200 Message-ID: Subject: Re: [RFC PATCH] compiler_attributes.h: Add 'fallthrough' pseudo keyword for switch/case use To: "H. Peter Anvin" Cc: Peter Zijlstra , Joe Perches , Pavel Machek , Linus Torvalds , Kees Cook , Borislav Petkov , Thomas Gleixner , Ingo Molnar , "Gustavo A . R . Silva" , Arnaldo Carvalho de Melo , Kan Liang , Namhyung Kim , Jiri Olsa , Alexander Shishkin , Shawn Landden , "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" , linux-kernel Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jul 31, 2019 at 11:01 PM wrote: > > The standard is moving toward adding this as an attribute with the [[fallthrough]] syntax; it is in C++17, not sure when it will be in C be if it isn't already. Not yet, but it seems to be coming: http://www.open-std.org/jtc1/sc22/wg14/www/docs/n2268.pdf However, even if C2x gets it, it will be quite a while until the GCC minimum version gets bumped up to that, so... Cheers, Miguel