From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754917Ab3LDBnU (ORCPT ); Tue, 3 Dec 2013 20:43:20 -0500 Received: from terminus.zytor.com ([198.137.202.10]:50588 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752823Ab3LDBnQ (ORCPT ); Tue, 3 Dec 2013 20:43:16 -0500 Date: Tue, 3 Dec 2013 17:42:56 -0800 From: "tip-bot for H. Peter Anvin" Message-ID: Cc: linux-kernel@vger.kernel.org, hpa@zytor.com, mingo@kernel.org, tglx@linutronix.de, hpa@linux.intel.com, hjl.tools@gmail.com, kevin.b.smith@intel.com Reply-To: mingo@kernel.org, hpa@zytor.com, linux-kernel@vger.kernel.org, tglx@linutronix.de, hpa@linux.intel.com, kevin.b.smith@intel.com, hjl.tools@gmail.com To: linux-tip-commits@vger.kernel.org Subject: [tip:x86/urgent] x86-64, build: Always pass in -mno-sse Git-Commit-ID: 5551a34e5aeab868f8d37f70d8754868921b4ee5 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 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.1 (terminus.zytor.com [127.0.0.1]); Tue, 03 Dec 2013 17:43:02 -0800 (PST) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: 5551a34e5aeab868f8d37f70d8754868921b4ee5 Gitweb: http://git.kernel.org/tip/5551a34e5aeab868f8d37f70d8754868921b4ee5 Author: H. Peter Anvin AuthorDate: Wed, 20 Nov 2013 13:31:49 -0800 Committer: H. Peter Anvin CommitDate: Tue, 3 Dec 2013 17:40:22 -0800 x86-64, build: Always pass in -mno-sse Always pass in the -mno-sse argument, regardless if -preferred-stack-boundary is supported. We never want to generate SSE instructions in the kernel unless we *really* know what we're doing. According to H. J. Lu, any version of gcc new enough that we support it at all should handle the -mno-sse option, so just add it unconditionally. Reported-by: Kevin B. Smith Signed-off-by: H. Peter Anvin Cc: H. J. Lu Link: http://lkml.kernel.org/n/tip-j21wzqv790q834n7yc6g80j1@git.kernel.org Cc: # build fix only --- arch/x86/Makefile | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/arch/x86/Makefile b/arch/x86/Makefile index 41250fb..eda00f9 100644 --- a/arch/x86/Makefile +++ b/arch/x86/Makefile @@ -31,6 +31,9 @@ ifeq ($(CONFIG_X86_32),y) KBUILD_CFLAGS += -msoft-float -mregparm=3 -freg-struct-return + # Don't autogenerate SSE instructions + KBUILD_CFLAGS += -mno-sse + # Never want PIC in a 32-bit kernel, prevent breakage with GCC built # with nonstandard options KBUILD_CFLAGS += -fno-pic @@ -57,8 +60,11 @@ else KBUILD_AFLAGS += -m64 KBUILD_CFLAGS += -m64 + # Don't autogenerate SSE instructions + KBUILD_CFLAGS += -mno-sse + # Use -mpreferred-stack-boundary=3 if supported. - KBUILD_CFLAGS += $(call cc-option,-mno-sse -mpreferred-stack-boundary=3) + KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=3) # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu) cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8)