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=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 5BEF2C433EF for ; Thu, 23 Sep 2021 03:44:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4409160FE8 for ; Thu, 23 Sep 2021 03:44:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239187AbhIWDp7 (ORCPT ); Wed, 22 Sep 2021 23:45:59 -0400 Received: from mail.kernel.org ([198.145.29.99]:42362 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239078AbhIWDoK (ORCPT ); Wed, 22 Sep 2021 23:44:10 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 44EDC61038; Thu, 23 Sep 2021 03:40:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1632368458; bh=wshpeas/bLecEKGrLbRMPe2/oI9FuLRhGmWfRKrEC1Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZR5AeLNRkKbazBJBfOshRbvPOGfogCjDCgvpLWXWQ+jZxu/D7iL0bUQ5NQg4Zo02f HmXHwLUU0OlVK4jRuR2mlA3acZ3Br94cUTB9ZPk5Dfu5QrEKouH/D68JdSidJUZZPn 678WcBgGxpDWs9N8cOseVoO5LXbYQb/kWtGj3aguMSuVS2M0jm0Q4DumByCLYhulxb EfRmE1bcpUQMVl4OvNYCRqmVRVrvkgOf73jQXiVSqLEU7XHYCTXZ8LL0J08YpZAnTA mT47M6cfDSai7igD66VImsGygkInHl6oWtS9tqa3VwlNna73mrR2drfYaJRA4VovXo /DZ+6GjJZcFBg== 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 4.4 02/10] compiler.h: Introduce absolute_pointer macro Date: Wed, 22 Sep 2021 23:40:45 -0400 Message-Id: <20210923034055.1422059-2-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210923034055.1422059-1-sashal@kernel.org> References: <20210923034055.1422059-1-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-sparse@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 7cabe0cc8665..bc8077e5e688 100644 --- a/include/linux/compiler.h +++ b/include/linux/compiler.h @@ -208,6 +208,8 @@ void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect); (typeof(ptr)) (__ptr + (off)); }) #endif +#define absolute_pointer(val) RELOC_HIDE((void *)(val), 0) + #ifndef OPTIMIZER_HIDE_VAR #define OPTIMIZER_HIDE_VAR(var) barrier() #endif -- 2.30.2