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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 3B892C3A5A8 for ; Wed, 4 Sep 2019 16:05:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1426520820 for ; Wed, 4 Sep 2019 16:05:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1567613123; bh=ywhWMiCOD8p7oAIcsevV7D+iSEKxSbL4TD1/RN2KVuw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=qTvchVkBKzkmezV2omUx/VYFi7CWH/xMwBqPBlLKbwUBAXOUzX8Yeic6NQcblyjAI V7aYFBiE1K5rGuUXnddYVDi6nRK7x1MEtlwufi1q+TDkn8yvMQl1sLBOzBi9nV3+8I NowyoEsuluM4pGBY7yqRtD40H8WX5twjlWFBccP4= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731804AbfIDQFW (ORCPT ); Wed, 4 Sep 2019 12:05:22 -0400 Received: from mail.kernel.org ([198.145.29.99]:39028 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732455AbfIDQCu (ORCPT ); Wed, 4 Sep 2019 12:02:50 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 93D942087E; Wed, 4 Sep 2019 16:02:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1567612969; bh=ywhWMiCOD8p7oAIcsevV7D+iSEKxSbL4TD1/RN2KVuw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=AR/E7Yvah4rbW2TqCcq97w6M+fdZt/PeitQedfsDt35laBigfWcIuQsAldZO4jEej QMHtE2lXHFEsSVyVA2unLlC1x9kY4O5Cae/TJi4exyyI3SeFuVm5rzl7YTYuEUdTwe A2h9MzGW+Eu5tBOhAGBZjDwz/RPzFa1arulH+ozk= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Linus Torvalds , Borislav Petkov , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Sasha Levin Subject: [PATCH AUTOSEL 4.9 20/27] x86/build: Add -Wnoaddress-of-packed-member to REALMODE_CFLAGS, to silence GCC9 build warning Date: Wed, 4 Sep 2019 12:02:13 -0400 Message-Id: <20190904160220.4545-20-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190904160220.4545-1-sashal@kernel.org> References: <20190904160220.4545-1-sashal@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Linus Torvalds [ Upstream commit 42e0e95474fc6076b5cd68cab8fa0340a1797a72 ] One of the very few warnings I have in the current build comes from arch/x86/boot/edd.c, where I get the following with a gcc9 build: arch/x86/boot/edd.c: In function ‘query_edd’: arch/x86/boot/edd.c:148:11: warning: taking address of packed member of ‘struct boot_params’ may result in an unaligned pointer value [-Waddress-of-packed-member] 148 | mbrptr = boot_params.edd_mbr_sig_buffer; | ^~~~~~~~~~~ This warning triggers because we throw away all the CFLAGS and then make a new set for REALMODE_CFLAGS, so the -Wno-address-of-packed-member we added in the following commit is not present: 6f303d60534c ("gcc-9: silence 'address-of-packed-member' warning") The simplest solution for now is to adjust the warning for this version of CFLAGS as well, but it would definitely make sense to examine whether REALMODE_CFLAGS could be derived from CFLAGS, so that it picks up changes in the compiler flags environment automatically. Signed-off-by: Linus Torvalds Acked-by: Borislav Petkov Cc: Peter Zijlstra Cc: Thomas Gleixner Signed-off-by: Ingo Molnar Signed-off-by: Sasha Levin --- arch/x86/Makefile | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/x86/Makefile b/arch/x86/Makefile index 2996a1d0a410a..940ed27a62123 100644 --- a/arch/x86/Makefile +++ b/arch/x86/Makefile @@ -38,6 +38,7 @@ REALMODE_CFLAGS := $(M16_CFLAGS) -g -Os -D__KERNEL__ \ REALMODE_CFLAGS += $(call __cc-option, $(CC), $(REALMODE_CFLAGS), -ffreestanding) REALMODE_CFLAGS += $(call __cc-option, $(CC), $(REALMODE_CFLAGS), -fno-stack-protector) +REALMODE_CFLAGS += $(call __cc-option, $(CC), $(REALMODE_CFLAGS), -Wno-address-of-packed-member) REALMODE_CFLAGS += $(call __cc-option, $(CC), $(REALMODE_CFLAGS), $(cc_stack_align4)) export REALMODE_CFLAGS -- 2.20.1