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=-6.6 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT 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 BC924C55178 for ; Tue, 27 Oct 2020 03:56:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 73479207F7 for ; Tue, 27 Oct 2020 03:56:34 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="X6v+3QJK" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2505298AbgJ0D4d (ORCPT ); Mon, 26 Oct 2020 23:56:33 -0400 Received: from mail-pg1-f194.google.com ([209.85.215.194]:32949 "EHLO mail-pg1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2503837AbgJ0D4b (ORCPT ); Mon, 26 Oct 2020 23:56:31 -0400 Received: by mail-pg1-f194.google.com with SMTP id r186so17346pgr.0; Mon, 26 Oct 2020 20:56:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=928Y6cCd6X7WfnBYvopP1Oa2ebBib5VLieFKDVDEi2w=; b=X6v+3QJK/VS5UqSInpaGMsjoTfULx1WBJnoglunD0dwztyk+j76zyuuliPcfXojQqL nGa8gkbaGIQM/MCJ67Y7uDBmaCVNfbpMfKmjb/1luBo5LEhBx0hz9XImMryKJHWPpsSv BL4sUI+ZKpoveeXqMi0gW+uB/mPrEFjK9F4itvkRgULsEyPxPrLBMv/zzc42zLD7uLpp zzg+Wy68Ns0ajIo/F5a8A84+bOkh7izxulhhk5iLBY//3xIn7xIQh8eICphbv7MStFhi AwLrAQ2sM3bpWh6yXdr9WKluQzGZ9cG1olSAp+8Kahj/OSShOL8nkcoC6g1oxCsX6Bvv 4NMA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=928Y6cCd6X7WfnBYvopP1Oa2ebBib5VLieFKDVDEi2w=; b=Z73emwARnXuv9KRmzrBlmuwjKssMMwr4eVg0eGaD7jthPWAhFIkiSh8246Lb8i/Kdd g+uONHpKosNIgh1ZSsuOAvqTPgwl5zPQJz8eq5zUAuxGnOW33oBdcqu9MMrU/QqAswx0 Pg7zZwzYa7igo2CW9QpeNeMeW8wMShYn3tNbzAwXxCEkH5CcAnpj7FWTWuJP26dmA9Tl I8u+L/S3/iC9m157AfcUR+0pf/iLBjXp4s5BUiTrqAVRKoUwtwWDTDr0Dy3oeAWNasDR L4KROgJZhzjmlOdo7ZCyI5ug3WvtucttuSjrmHYVh84Fke8yKJ/ZDWiDgw9sblrZH3mi eOOQ== X-Gm-Message-State: AOAM533vdWZQTK09ZxB+urWpFbPcZ+E3aFYI2dpQbmjSI7toaDAHEYNk tEK3zrzFUjrH9BTvFt76kfNj3WvS5fI= X-Google-Smtp-Source: ABdhPJxHBlE1wiWdIs0h7c8vreie4hIKCN0s6QZmaABbCv180f9n6Nc4xRdKkSigvrkO1FjPirDjow== X-Received: by 2002:a05:6a00:13a4:b029:163:f435:28b5 with SMTP id t36-20020a056a0013a4b0290163f43528b5mr299215pfg.45.1603770990931; Mon, 26 Oct 2020 20:56:30 -0700 (PDT) Received: from shane-XPS-13-9380.hsd1.ca.comcast.net ([2601:646:8800:1c00:ac90:26e5:f63a:9f81]) by smtp.gmail.com with ESMTPSA id e5sm274355pfl.216.2020.10.26.20.56.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 26 Oct 2020 20:56:30 -0700 (PDT) From: Xie He To: Arnd Bergmann Cc: Xie He , Chas Williams <3chas3@gmail.com>, Arnd Bergmann , Nathan Chancellor , Nick Desaulniers , "David S. Miller" , linux-atm-general@lists.sourceforge.net, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, clang-built-linux@googlegroups.com Subject: Re: [PATCH net-next 01/11] atm: horizon: shut up clang null pointer arithmetic warning Date: Mon, 26 Oct 2020 20:55:58 -0700 Message-Id: <20201027035558.16864-1-xie.he.0141@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20201026213040.3889546-1-arnd@kernel.org> References: <20201026213040.3889546-1-arnd@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > - for (mem = (HDW *) memmap; mem < (HDW *) (memmap + 1); ++mem) > + for (mem = (HDW *) memmap; mem < (HDW *) ((uintptr_t)memmap + 1); ++mem) Note that these two lines are semantically different. In the first line, "+ 1" moves the pointer by (sizeof memmap) bytes. However in the second line, "+ 1" moves the pointer by only 1 byte. This driver is old, but let's still keep its code correct!