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=-6.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 3C751C4360F for ; Mon, 25 Feb 2019 21:35:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 054EC21850 for ; Mon, 25 Feb 2019 21:35:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1551130539; bh=ql+NQtmjr2ZBKm+lpMpdvRcJ1P4yzIWpfUcyPHFCaKk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=EBE7rFx1rDlgYbEJ6p0Ee0TUOlOE5QybPoQBZWlJWT1QKVfhUH81IC8PYAxV1m355 BR9sm12ipochp/oU5rsEjF131vdFIaIQ0SWR8y8PVgrOgHTEsV0kkqPInVRYjBt22Z ngQajE1WKngGOrRc7T3fHcQYjG9X/4oCVykESZMM= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1733013AbfBYVfh (ORCPT ); Mon, 25 Feb 2019 16:35:37 -0500 Received: from mail.kernel.org ([198.145.29.99]:41802 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732999AbfBYVfe (ORCPT ); Mon, 25 Feb 2019 16:35:34 -0500 Received: from localhost (5356596B.cm-6-7b.dynamic.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 67925217F5; Mon, 25 Feb 2019 21:35:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1551130533; bh=ql+NQtmjr2ZBKm+lpMpdvRcJ1P4yzIWpfUcyPHFCaKk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Kxq2LNkmgC8pEvFNyPSVfh8bHuZiSweAGjUA785PRgJsOBJAhbBnUn+JwnsiAdXFO sDUUk99gE5LQgS3g1b6LsGhCKmpJK7rKJwey9i7NuQ0lfcNF1LXmvMHgGp2Srvouaa NSwhdvBxSIce0EvIKd0ceLXxrDuK3+RWfM5WcnAU= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Eugeniy Paltsev , Vineet Gupta Subject: [PATCH 4.20 152/183] ARCv2: Enable unaligned access in early ASM code Date: Mon, 25 Feb 2019 22:12:05 +0100 Message-Id: <20190225195120.625080340@linuxfoundation.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190225195054.748060397@linuxfoundation.org> References: <20190225195054.748060397@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore 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 4.20-stable review patch. If anyone has any objections, please let me know. ------------------ From: Eugeniy Paltsev commit 252f6e8eae909bc075a1b1e3b9efb095ae4c0b56 upstream. It is currently done in arc_init_IRQ() which might be too late considering gcc 7.3.1 onwards (GNU 2018.03) generates unaligned memory accesses by default Cc: stable@vger.kernel.org #4.4+ Signed-off-by: Eugeniy Paltsev Signed-off-by: Vineet Gupta [vgupta: rewrote changelog] Signed-off-by: Greg Kroah-Hartman --- arch/arc/kernel/head.S | 10 ++++++++++ 1 file changed, 10 insertions(+) --- a/arch/arc/kernel/head.S +++ b/arch/arc/kernel/head.S @@ -17,6 +17,7 @@ #include #include #include +#include .macro CPU_EARLY_SETUP @@ -47,6 +48,15 @@ sr r5, [ARC_REG_DC_CTRL] 1: + +#ifdef CONFIG_ISA_ARCV2 + ; Unaligned access is disabled at reset, so re-enable early as + ; gcc 7.3.1 (ARC GNU 2018.03) onwards generates unaligned access + ; by default + lr r5, [status32] + bset r5, r5, STATUS_AD_BIT + kflag r5 +#endif .endm .section .init.text, "ax",@progbits