From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751654AbdG1HnR (ORCPT ); Fri, 28 Jul 2017 03:43:17 -0400 Received: from terminus.zytor.com ([65.50.211.136]:34823 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751045AbdG1HnQ (ORCPT ); Fri, 28 Jul 2017 03:43:16 -0400 Date: Fri, 28 Jul 2017 00:38:42 -0700 From: tip-bot for Matthias Kaehlcke Message-ID: Cc: mingo@kernel.org, hpa@zytor.com, peterz@infradead.org, linux-kernel@vger.kernel.org, dianders@chromium.org, yamada.masahiro@socionext.com, torvalds@linux-foundation.org, tglx@linutronix.de, mka@chromium.org Reply-To: mingo@kernel.org, hpa@zytor.com, peterz@infradead.org, linux-kernel@vger.kernel.org, dianders@chromium.org, mka@chromium.org, tglx@linutronix.de, torvalds@linux-foundation.org, yamada.masahiro@socionext.com In-Reply-To: <20170725215053.135586-1-mka@chromium.org> References: <20170725215053.135586-1-mka@chromium.org> To: linux-tip-commits@vger.kernel.org Subject: [tip:x86/urgent] x86/boot: Disable the address-of-packed-member compiler warning Git-Commit-ID: 20c6c189045539d29f4854d92b7ea9c329e1edfc X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: 20c6c189045539d29f4854d92b7ea9c329e1edfc Gitweb: http://git.kernel.org/tip/20c6c189045539d29f4854d92b7ea9c329e1edfc Author: Matthias Kaehlcke AuthorDate: Tue, 25 Jul 2017 14:50:53 -0700 Committer: Ingo Molnar CommitDate: Fri, 28 Jul 2017 08:39:08 +0200 x86/boot: Disable the address-of-packed-member compiler warning The clang warning 'address-of-packed-member' is disabled for the general kernel code, also disable it for the x86 boot code. This suppresses a bunch of warnings like this when building with clang: ./arch/x86/include/asm/processor.h:535:30: warning: taking address of packed member 'sp0' of class or structure 'x86_hw_tss' may result in an unaligned pointer value [-Waddress-of-packed-member] return this_cpu_read_stable(cpu_tss.x86_tss.sp0); ^~~~~~~~~~~~~~~~~~~ ./arch/x86/include/asm/percpu.h:391:59: note: expanded from macro 'this_cpu_read_stable' #define this_cpu_read_stable(var) percpu_stable_op("mov", var) ^~~ ./arch/x86/include/asm/percpu.h:228:16: note: expanded from macro 'percpu_stable_op' : "p" (&(var))); ^~~ Signed-off-by: Matthias Kaehlcke Cc: Doug Anderson Cc: Linus Torvalds Cc: Masahiro Yamada Cc: Peter Zijlstra Cc: Thomas Gleixner Link: http://lkml.kernel.org/r/20170725215053.135586-1-mka@chromium.org Signed-off-by: Ingo Molnar --- arch/x86/boot/compressed/Makefile | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/x86/boot/compressed/Makefile b/arch/x86/boot/compressed/Makefile index 2c860ad..8a95827 100644 --- a/arch/x86/boot/compressed/Makefile +++ b/arch/x86/boot/compressed/Makefile @@ -34,6 +34,7 @@ KBUILD_CFLAGS += $(cflags-y) KBUILD_CFLAGS += -mno-mmx -mno-sse KBUILD_CFLAGS += $(call cc-option,-ffreestanding) KBUILD_CFLAGS += $(call cc-option,-fno-stack-protector) +KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) KBUILD_AFLAGS := $(KBUILD_CFLAGS) -D__ASSEMBLY__ GCOV_PROFILE := n