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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 358EBC433EF for ; Fri, 12 Nov 2021 20:07:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1C2C060F4B for ; Fri, 12 Nov 2021 20:07:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235497AbhKLUKs (ORCPT ); Fri, 12 Nov 2021 15:10:48 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33752 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235464AbhKLUKr (ORCPT ); Fri, 12 Nov 2021 15:10:47 -0500 Received: from mail-wr1-x436.google.com (mail-wr1-x436.google.com [IPv6:2a00:1450:4864:20::436]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A0DE0C061766 for ; Fri, 12 Nov 2021 12:07:56 -0800 (PST) Received: by mail-wr1-x436.google.com with SMTP id u1so17460655wru.13 for ; Fri, 12 Nov 2021 12:07:56 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=message-id:date:mime-version:user-agent:subject:content-language :from:to:cc:references:in-reply-to:content-transfer-encoding; bh=tLpivrBb+8Hw+u+PlGvRFWyiStMpmcrjr825s5lqJMQ=; b=CHYBUq+E8dbU4Ofr5Xw+w1xBja94hJBna/eWSECE1/67rbrDNdI1iTDV3SOhKR0UTJ 9G/4jrg9FVmc7VulCHU9Y6CAgNKlf4Mb+gWm4VKgZdzQrfD4VhRUpcaLF6/ma+7vNbBR xon7EsbDCPW/VkCnXLSWZMSOIr7XaipB6R0UV2rhxkHKLud0GUWUsJNOyL2yK0EK+HpQ vgl3N4o6jde9Bhke/3UpcE/GCn+xPxpePMgWILTX3qSkrVMP69iC64KrgncKHRLNYGxd 2SEY5rWeRMzk0RSjZTYxO32ULrKxgiEhg8A2b8FQrviRzlr/L1LrvM08v86vjyzwsi3F ofig== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:message-id:date:mime-version:user-agent:subject :content-language:from:to:cc:references:in-reply-to :content-transfer-encoding; bh=tLpivrBb+8Hw+u+PlGvRFWyiStMpmcrjr825s5lqJMQ=; b=q7zJG7nk3Wv3xFnDQkRdhdA2Tn3qasIPOoYsjcBga1upZMXKmY9VwpXng0yduqcj2x c9c6FY7qgiquHhajTBd6zhaRQuqkYMiVZDPKu+AaB8ubJ4fEDHTOw2E6jbVpjSDbD3r7 F4x7YTPDacUyeDUveEDsJiCE0zZgPpYbY0/IgxDSq9vc9jV64Tz7ygmVwPls3xBezboj YqHMFsc3Fw5frnGhR6Foqg6vo9pNcfBuTPHfejKZ3JMnDPE0XZp1jXduoIMtTXQW5Hpv 4YdC7j9qGrMdwFN6pNiyppi1GnjSBkcAmHGPIEvKJ4oZE5UVub34dNrHEOIT6mLbY8le hkKA== X-Gm-Message-State: AOAM530FpNXmp4Kp0lC8gzgnvuPyWrKubPyHqngE3ejJ1/k/j6B0cskB G1TYvChE+pdgXXmVLuAAC6c= X-Google-Smtp-Source: ABdhPJyMwwe12KJxr34FKM1IqZ9kFca8BLWG/7GCoPAh619CXhR/OZnJV44BfjObnnv49ZisaprThw== X-Received: by 2002:a5d:47c7:: with SMTP id o7mr22361237wrc.204.1636747675235; Fri, 12 Nov 2021 12:07:55 -0800 (PST) Received: from [10.168.10.170] ([170.253.36.171]) by smtp.gmail.com with ESMTPSA id n1sm7202449wmq.6.2021.11.12.12.07.54 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 12 Nov 2021 12:07:55 -0800 (PST) Message-ID: <8c840e69-e437-2ec8-a8e8-c990f35dffe6@gmail.com> Date: Fri, 12 Nov 2021 21:07:54 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.3.0 Subject: Re: [PATCH v2] mctp.7: Add man page for Linux MCTP support Content-Language: en-US From: "Alejandro Colomar (man-pages)" To: "G. Branden Robinson" Cc: Jeremy Kerr , Michael Kerrisk , linux-man@vger.kernel.org References: <20211111015323.3542313-1-jk@codeconstruct.com.au> <76dd85f7-ab8a-1dcc-5b1a-5eb9a87d23bc@gmail.com> <20211112194050.w675gtlnecpc2r3x@localhost.localdomain> <02a98db8-6dec-d66b-4cde-81bed9de6620@gmail.com> In-Reply-To: <02a98db8-6dec-d66b-4cde-81bed9de6620@gmail.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-man@vger.kernel.org On 11/12/21 21:07, Alejandro Colomar (man-pages) wrote: > > > On 11/12/21 20:40, G. Branden Robinson wrote: >> At 2021-11-12T19:45:16+0100, Alejandro Colomar (man-pages) wrote: >>> Also, we prevent some crazy programmers from relying on that padding >>> byte being actually padding and not something else, even if it "must" >>> be zero.  I've seen too much crazy stuff; programmers relying on >>> undefined behavior just because "we don't plan to move from C++17 to >>> C++20, so this is safe". > > A more complete report of the horrifying story can be found here: > > > The code to which it refers is closed-source, so I can't link to it. > But you can feel how wrong it was. > It made use of a library that provided C20's std::span for older > standards, and has some specified behavior for what C20 regarded as UB. >  Guess what. D'oh! C++20 -- Alejandro Colomar Linux man-pages comaintainer; http://www.kernel.org/doc/man-pages/ http://www.alejandro-colomar.es/