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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,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 433D6C3A5A6 for ; Thu, 19 Sep 2019 22:21:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 152A221920 for ; Thu, 19 Sep 2019 22:21:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1568931699; bh=txizpSKWNllJpJ8T6Vas/37oGmdhWUzm8YhP+TFhjJs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=gf6fhH2i31dXaHO3WJu9Rnncg7rG+i36qcejCe9I1E0+bivDY1xqDnTZ49K2zAsRi +m76oI0NVGuwpqCSO+odNCFTWyXj71yZNvohiZqBtKC1UiHYGvGXtSCKLo0yUP49Lp wCYf4opOiLEwxVU+kIy3gsMXj73BGRVJgO/zRC+M= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2404843AbfISWVi (ORCPT ); Thu, 19 Sep 2019 18:21:38 -0400 Received: from mail.kernel.org ([198.145.29.99]:36140 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2406735AbfISWVf (ORCPT ); Thu, 19 Sep 2019 18:21:35 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 45FBC217D6; Thu, 19 Sep 2019 22:21:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1568931694; bh=txizpSKWNllJpJ8T6Vas/37oGmdhWUzm8YhP+TFhjJs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=oPzX5JjNPqeYJ6cqV7aARSwM0zsYEYp0bJGR9dn1HObcAwysa+PAC+Ch86ugD548L BdYhDEU9r8RXspJlRUK7tLQ/7wIb0LGcsYy0vvdCajjwcTldwowgYTeG4+FMyyVvuB TCTD+LGMBW6dEi8ylpigLs+ThzyYiPbmofZm1k2g= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Linus Torvalds , Borislav Petkov , Peter Zijlstra , Thomas Gleixner , Ingo Molnar Subject: [PATCH 4.9 34/74] x86/build: Add -Wnoaddress-of-packed-member to REALMODE_CFLAGS, to silence GCC9 build warning Date: Fri, 20 Sep 2019 00:03:47 +0200 Message-Id: <20190919214808.286300816@linuxfoundation.org> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20190919214800.519074117@linuxfoundation.org> References: <20190919214800.519074117@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Linus Torvalds commit 42e0e95474fc6076b5cd68cab8fa0340a1797a72 upstream. 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: Greg Kroah-Hartman --- arch/x86/Makefile | 1 + 1 file changed, 1 insertion(+) --- a/arch/x86/Makefile +++ b/arch/x86/Makefile @@ -38,6 +38,7 @@ REALMODE_CFLAGS := $(M16_CFLAGS) -g -Os 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