From patchwork Tue Nov 29 12:39:49 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vladimir Murzin X-Patchwork-Id: 9451939 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id DA4706071C for ; Tue, 29 Nov 2016 12:48:18 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id CF86C27F8F for ; Tue, 29 Nov 2016 12:48:18 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id C455E28324; Tue, 29 Nov 2016 12:48:18 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 3F0A727F8F for ; Tue, 29 Nov 2016 12:48:18 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.85_2 #1 (Red Hat Linux)) id 1cBhnn-0007tS-44; Tue, 29 Nov 2016 12:46:27 +0000 Received: from foss.arm.com ([217.140.101.70]) by bombadil.infradead.org with esmtp (Exim 4.85_2 #1 (Red Hat Linux)) id 1cBhic-0002ld-Ib for linux-arm-kernel@lists.infradead.org; Tue, 29 Nov 2016 12:41:11 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 5E1871610; Tue, 29 Nov 2016 04:40:30 -0800 (PST) Received: from login2.euhpc.arm.com (login2.euhpc.arm.com [10.6.26.144]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id C1A3E3F318; Tue, 29 Nov 2016 04:40:29 -0800 (PST) From: Vladimir Murzin To: linux-arm-kernel@lists.infradead.org Subject: [RFC v2 PATCH 07/23] ARM: NOMMU: fix head-nommu build for pre-ARMv7 CPUs Date: Tue, 29 Nov 2016 12:39:49 +0000 Message-Id: <1480423205-48436-8-git-send-email-vladimir.murzin@arm.com> X-Mailer: git-send-email 2.0.0 In-Reply-To: <1480423205-48436-1-git-send-email-vladimir.murzin@arm.com> References: <1480423205-48436-1-git-send-email-vladimir.murzin@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20161129_044106_857831_D5CE7979 X-CRM114-Status: UNSURE ( 6.75 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Russell King , arnd@arndb.de MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP While building for pre-ARMv7 CPUs with ARM_MPU enabled following error shows up: AS arch/arm/kernel/head-nommu.o arch/arm/kernel/head-nommu.S: Assembler messages: arch/arm/kernel/head-nommu.S:223: Error: selected processor does not support ARM mode `isb' arch/arm/kernel/head-nommu.S:231: Error: selected processor does not support ARM mode `isb' arch/arm/kernel/head-nommu.S:235: Error: selected processor does not support ARM mode `isb' arch/arm/kernel/head-nommu.S:244: Error: selected processor does not support ARM mode `isb' arch/arm/kernel/head-nommu.S:248: Error: selected processor does not support ARM mode `isb' arch/arm/kernel/head-nommu.S:258: Error: selected processor does not support ARM mode `isb' arch/arm/kernel/head-nommu.S:265: Error: selected processor does not support ARM mode `isb' make[1]: *** [arch/arm/kernel/head-nommu.o] Error 1 MPU setup code is available for ARMv7 only, but head-nommu.S is generic, so build head-nommu.S with -march=armv7-a (and armv7-m for M-calss to avoid "Conflicting architecture profiles M/A" link time) flag; in case pre-ARMv7 it detects there there is no MPU is avaliable, so it will never reach those instructions. Cc: Russell King Signed-off-by: Vladimir Murzin --- arch/arm/kernel/Makefile | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile index ad325a8..6da8b04 100644 --- a/arch/arm/kernel/Makefile +++ b/arch/arm/kernel/Makefile @@ -84,6 +84,11 @@ endif obj-$(CONFIG_PARAVIRT) += paravirt.o head-y := head$(MMUEXT).o +ifeq ($(CONFIG_CPU_V7M),y) +AFLAGS_head-nommu.o :=-Wa,-march=armv7-m +else +AFLAGS_head-nommu.o :=-Wa,-march=armv7-a +endif obj-$(CONFIG_DEBUG_LL) += debug.o obj-$(CONFIG_EARLY_PRINTK) += early_printk.o