From patchwork Wed Sep 15 03:52:23 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Guenter Roeck X-Patchwork-Id: 12495403 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=ham 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 1BCD7C433FE for ; Wed, 15 Sep 2021 03:52:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F21D060F3A for ; Wed, 15 Sep 2021 03:52:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236254AbhIODxv (ORCPT ); Tue, 14 Sep 2021 23:53:51 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55534 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236143AbhIODxu (ORCPT ); Tue, 14 Sep 2021 23:53:50 -0400 Received: from mail-ot1-x332.google.com (mail-ot1-x332.google.com [IPv6:2607:f8b0:4864:20::332]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 40C53C061574; Tue, 14 Sep 2021 20:52:32 -0700 (PDT) Received: by mail-ot1-x332.google.com with SMTP id o16-20020a9d2210000000b0051b1e56c98fso1736657ota.8; Tue, 14 Sep 2021 20:52:32 -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=EWlyAfIJ6LK6KpxwIys48q3PWxQlxyDohB67wcgCd/M=; b=nUrn/Lw/ozglO0/A9wBQBB3xPkoAzmKdrQprI3+VccXyvcgJsFFh6Bxae1HWUezXd4 AQmb9ebsH9GIgQE1wl9KXWoc7PiSvaIXe9WbY/IYmDO2508scavL+H0oJX9G/cISxyrs l7dPZq/Rzp/uC/iEYMQydnJlrkX84nLnxe5tih2wDXRTX+TvBe2oCSsAxdYX1HhGNItO ZbYGuPbTSYb0At2GGZVSlG9XTXaXKO2wfMUzpjKvNqfo/sD0H9uxRzfXaUWlNF9avXLB uvmw7xVrRzDHurwjcA9UUGVm8zBBI/SskOAh6S7tIPd1LrwGhQjamQId6BvHpdzk92Fe Aq/w== 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=EWlyAfIJ6LK6KpxwIys48q3PWxQlxyDohB67wcgCd/M=; b=LjwCgFED5njp+u/j+TJYe7dYhwrrI687AyWsiQmkAQvI+Y4BSxaFr84MGmD6CQ2CqI wA20udHUY16ZX8D6Pk7+cNi3xgZksyaWXVhEL9ZKU8JaaXvpQpqcOimkEkUfPeP1tk+N vHstZUJLJJGc9UK/KlP/bHiEtcjGKRaOmdKaMSCwFB54EhM9bZBhsKSiWEa0pT0FVwrY FyTZfZhp2gc7+xd0fI+efpBCOd0uN7PylgIn2PyhvM+DAajFX/CFvdg5IpqlbSYf7oB8 OZTdw4g9dZlfQhhwV1OSYBa15msZM+VHjVQw17ofnycRGvd+CLWlkrCb1dCmhSBb8m27 KQQg== X-Gm-Message-State: AOAM530k0XA2LhbRRUKFy6kZXelNdGlSkbXM+McVf0nPUm8o0Y3sLy/3 e2iUTyoyoXOfScRZf/JyJFJExQ+RbtM= X-Google-Smtp-Source: ABdhPJzoMC19sXj6sgU0ESAUjmLqYY7d90Vdr5m68MaI4eRv2IeMsJvMNWYhojvqU0D2qXE51sqMMQ== X-Received: by 2002:a05:6830:1f0a:: with SMTP id u10mr17832026otg.53.1631677951631; Tue, 14 Sep 2021 20:52:31 -0700 (PDT) Received: from server.roeck-us.net ([2600:1700:e321:62f0:329c:23ff:fee3:9d7c]) by smtp.gmail.com with ESMTPSA id x1sm3017780otu.8.2021.09.14.20.52.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 14 Sep 2021 20:52:30 -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 v2 0/4] Introduce and use absolute_pointer macro Date: Tue, 14 Sep 2021 20:52:23 -0700 Message-Id: <20210915035227.630204-1-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 if gcc's builtin functions are used for those operations. 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. v2: Drop parisc patch (the problem will be solved differently) alpha: Move setup.h out of uapi Define COMMAND_LINE for alpha as absolute_pointer instead of using absolute_pointer on the define. ---------------------------------------------------------------- Guenter Roeck (4): compiler.h: Introduce absolute_pointer macro net: i825xx: Use absolute_pointer for memcpy from fixed memory location alpha: Move setup.h out of uapi alpha: Use absolute_pointer to define COMMAND_LINE arch/alpha/include/asm/setup.h | 43 +++++++++++++++++++++++++++++++++++++ arch/alpha/include/uapi/asm/setup.h | 42 +++--------------------------------- drivers/net/ethernet/i825xx/82596.c | 2 +- include/linux/compiler.h | 2 ++ 4 files changed, 49 insertions(+), 40 deletions(-) create mode 100644 arch/alpha/include/asm/setup.h Signed-off-by: Ulrich Teichert