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=-20.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 E89A7C433EF for ; Thu, 23 Sep 2021 03:41:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D345061356 for ; Thu, 23 Sep 2021 03:41:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239289AbhIWDmq (ORCPT ); Wed, 22 Sep 2021 23:42:46 -0400 Received: from mail.kernel.org ([198.145.29.99]:42692 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239500AbhIWDlM (ORCPT ); Wed, 22 Sep 2021 23:41:12 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 5D0336124F; Thu, 23 Sep 2021 03:39:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1632368381; bh=rhV09odn3N6lzn4H/XhQcSW3wW6sHFdFsL9736YOl2U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=kQtfCtoAnCig0wZfaxBdlkG+b925kwhNU7u4kyjUU8fGIWLMgyFHL6wdx8RWOrY8L 7ah7v9PAcZcBfsXrjW4GwM9X/NqFC1y8yvqQdrOfsryeIF0Ijs9LP8bA8dIhr+WHhf mdMTJXyU51r3Aol6n/DOXuiHsmOJ5wQQ0H+uDp+6CZq1vOveNC+iigKawQmzbbWMzN RwB101b4zfEpvyTR3UASdU05F6YlYM1+2neCMBb6i8KsHmRgOKi0q3TltVzbeY97WC W5w6caZe1a5PTAPJTPfU5e6tc85w0GH3GqJc1utNYBfPbYeT7Yr9uyUDGI7G9MpC9v LHrmN7+QC6fKQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Guenter Roeck , Linus Torvalds , Geert Uytterhoeven , Sasha Levin , luc.vanoostenryck@gmail.com, linux-sparse@vger.kernel.org Subject: [PATCH AUTOSEL 4.19 07/15] compiler.h: Introduce absolute_pointer macro Date: Wed, 22 Sep 2021 23:39:21 -0400 Message-Id: <20210923033929.1421446-7-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210923033929.1421446-1-sashal@kernel.org> References: <20210923033929.1421446-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Guenter Roeck [ Upstream commit f6b5f1a56987de837f8e25cd560847106b8632a8 ] absolute_pointer() disassociates a pointer from its originating symbol type and context. Use it to prevent compiler warnings/errors such as 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. Suggested-by: Linus Torvalds Signed-off-by: Guenter Roeck Reviewed-by: Geert Uytterhoeven Signed-off-by: Linus Torvalds Signed-off-by: Sasha Levin --- include/linux/compiler.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/include/linux/compiler.h b/include/linux/compiler.h index 6a53300cbd1e..ab9dfb14f486 100644 --- a/include/linux/compiler.h +++ b/include/linux/compiler.h @@ -228,6 +228,8 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val, (typeof(ptr)) (__ptr + (off)); }) #endif +#define absolute_pointer(val) RELOC_HIDE((void *)(val), 0) + #ifndef OPTIMIZER_HIDE_VAR /* Make the optimizer believe the variable can be manipulated arbitrarily. */ #define OPTIMIZER_HIDE_VAR(var) \ -- 2.30.2