Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760242AbbKULAq (ORCPT ); Sat, 21 Nov 2015 06:00:46 -0500 Received: from e06smtp08.uk.ibm.com ([195.75.94.104]:60183 "EHLO e06smtp08.uk.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752876AbbKULAH (ORCPT ); Sat, 21 Nov 2015 06:00:07 -0500 X-IBM-Helo: d06dlp01.portsmouth.uk.ibm.com X-IBM-MailFrom: heiko.carstens@de.ibm.com X-IBM-RcptTo: linux-kbuild@vger.kernel.org;linux-kernel@vger.kernel.org From: Heiko Carstens To: Michal Marek Cc: linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, Martin Schwidefsky , Heiko Carstens Subject: [PATCH 2/2] s390: compile head.s always with -march=z900 Date: Sat, 21 Nov 2015 11:59:59 +0100 Message-Id: <1448103599-6660-3-git-send-email-heiko.carstens@de.ibm.com> X-Mailer: git-send-email 2.3.9 In-Reply-To: <1448103599-6660-1-git-send-email-heiko.carstens@de.ibm.com> References: <1448103599-6660-1-git-send-email-heiko.carstens@de.ibm.com> X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 15112111-0033-0000-0000-000004D7FFDE Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1528 Lines: 41 head.s on s390 contains some sanity checks if the kernel will run on a machine or if the machine is too old, e.g. if the kernel contains instructions not available on the machine. If so, it will emit an error message to the console before it stops execution. Therefore head.s contains only instructions which are availanble with the earliest machine generation (z900). In order to make sure we don't accidently add instructions which are not available on z900, always compile with -march=z900. This makes sure compilation will fail if wrong instructions are used. Signed-off-by: Heiko Carstens --- arch/s390/kernel/Makefile | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/arch/s390/kernel/Makefile b/arch/s390/kernel/Makefile index dc167a23b920..a53755e37e3d 100644 --- a/arch/s390/kernel/Makefile +++ b/arch/s390/kernel/Makefile @@ -34,8 +34,10 @@ CFLAGS_sysinfo.o += -w # CFLAGS_REMOVE_sclp.o = $(CC_FLAGS_FTRACE) ifneq ($(CC_FLAGS_MARCH),-march=z900) -CFLAGS_REMOVE_sclp.o += $(CC_FLAGS_MARCH) -CFLAGS_sclp.o += -march=z900 +CFLAGS_REMOVE_sclp.o += $(CC_FLAGS_MARCH) +CFLAGS_sclp.o += -march=z900 +AFLAGS_REMOVE_head.o += $(CC_FLAGS_MARCH) +AFLAGS_head.o += -march=z900 endif GCOV_PROFILE_sclp.o := n -- 2.3.9 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/