From patchwork Sun Sep 12 16:01:45 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Guenter Roeck X-Patchwork-Id: 12486943 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=-11.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 260D0C433F5 for ; Sun, 12 Sep 2021 16:01:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0022561050 for ; Sun, 12 Sep 2021 16:01:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233893AbhILQDK (ORCPT ); Sun, 12 Sep 2021 12:03:10 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56012 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229726AbhILQDJ (ORCPT ); Sun, 12 Sep 2021 12:03:09 -0400 Received: from mail-ot1-x32a.google.com (mail-ot1-x32a.google.com [IPv6:2607:f8b0:4864:20::32a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 947E1C061574; Sun, 12 Sep 2021 09:01:55 -0700 (PDT) Received: by mail-ot1-x32a.google.com with SMTP id i8-20020a056830402800b0051afc3e373aso9867776ots.5; Sun, 12 Sep 2021 09:01:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=sender:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=369lDAEYI6mhcg75EK6D9X/8m+ItLAaJCovGP1Kk1FE=; b=mzzQHVTUH56eSIfjTlTliV7cmskLg33EaeKzO5HpHV1sLBJCnDeUTO07YqZjy8jZZi hc/YKR5o5m4S1dhCH1ubOowAKoNHBkftRpvPF3tAKX2O/vLWNUWirs2OJM60lekpwhzC txQAZJIuSaIx0vhp5gLjFEo1pu5ochkFYkjwVBu9lVk1CsdkUD451UPHlwZzjTbrkUKC Ulr81r6kJiBzVU2KCCmddPDNuQjIEPpPH6bRoU2nuoPStcWL8WXjiAMfawWmnMXXuCXy fcoNkia2JJk+vUXwukWytrb9OM4o6u9GchgXrZR60T/nCrQW7mslnQqJDd76/ueDBGHr 0Q+A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:sender:from:to:cc:subject:date:message-id :mime-version:content-transfer-encoding; bh=369lDAEYI6mhcg75EK6D9X/8m+ItLAaJCovGP1Kk1FE=; b=lCwF30NWKuGKFYbHsmku+JDE/xzoLSg9MZXOffvsjmYiK3CR6ZBjLQ6Z3uKKtv9Gf/ X14tpxtGPnrNDGkYKU1C/khM6pnlOuexDIhSnFI1Ttw4UeF0isPFPa3UqMyhPhRw6cDo MFfU96DbNbfL0v10IcaJSZMEMRa6DW3DNwbx5Exbl5oPXrnX8HThzbd9I8iyTP3/sV/G /xOqNespXGvzXNM8KG9ZbfCRH4xUxwostc7G3/KM7XFRqquygmxuVB5rXj0JBNLbfEWS 8POhGEP4XfrGa7mITeJLrBFdD3rD7lx7kmKxsn/VPbUWi0OX/Y9rsVcuepTf3FXliqYv twiA== X-Gm-Message-State: AOAM531ffXIgIPtg27emr9PW69FpdgYAC3iJJxvU89oA4d8vsOviigH6 X2cLLKT15VznkJ/e34PSDnU= X-Google-Smtp-Source: ABdhPJzneesaRyA04uz0dYaU3J/hFLUe4dPodIY2EmY/vwBEQ8lVRgqbUa/daSuh3fjZ3lZqoBw0Xw== X-Received: by 2002:a9d:75d5:: with SMTP id c21mr6148356otl.118.1631462515002; Sun, 12 Sep 2021 09:01:55 -0700 (PDT) Received: from server.roeck-us.net ([2600:1700:e321:62f0:329c:23ff:fee3:9d7c]) by smtp.gmail.com with ESMTPSA id s198sm1074938oie.47.2021.09.12.09.01.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 12 Sep 2021 09:01:54 -0700 (PDT) Sender: Guenter Roeck From: Guenter Roeck To: Linus Torvalds Cc: Richard Henderson , Ivan Kokshaysky , Matt Turner , "James E . J . Bottomley" , Helge Deller , "David S . Miller" , Jakub Kicinski , linux-alpha@vger.kernel.org, Geert Uytterhoeven , linux-kernel@vger.kernel.org, linux-parisc@vger.kernel.org, netdev@vger.kernel.org, linux-sparse@vger.kernel.org, Guenter Roeck Subject: [PATCH 0/4] Introduce and use absolute_pointer macro Date: Sun, 12 Sep 2021 09:01:45 -0700 Message-Id: <20210912160149.2227137-1-linux@roeck-us.net> X-Mailer: git-send-email 2.33.0 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-sparse@vger.kernel.org Kernel test builds currently fail for several architectures with error messages such as the following. drivers/net/ethernet/i825xx/82596.c: In function 'i82596_probe': ./arch/m68k/include/asm/string.h:72:25: error: '__builtin_memcpy' reading 6 bytes from a region of size 0 [-Werror=stringop-overread] Such warnings may be reported by gcc 11.x for string and memory operations on fixed addresses. This patch series introduces absolute_pointer() to fix the problem. absolute_pointer() disassociates a pointer from its originating symbol type and context, and thus prevents gcc from making assumptions about pointers passed to memory operations. ---------------------------------------------------------------- Guenter Roeck (4): compiler.h: Introduce absolute_pointer macro net: i825xx: Use absolute_pointer for memcpy on fixed memory location parisc: Use absolute_pointer for memcmp on fixed memory location alpha: Use absolute_pointer for strcmp on fixed memory location arch/alpha/kernel/setup.c | 2 +- arch/parisc/kernel/setup.c | 2 +- drivers/net/ethernet/i825xx/82596.c | 2 +- include/linux/compiler.h | 2 ++ 4 files changed, 5 insertions(+), 3 deletions(-)