From patchwork Wed Dec 21 11:40:54 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexey Brodkin X-Patchwork-Id: 707767 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2001:1868:205::9]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3tkCSj5Vxkz9s5g for ; Wed, 21 Dec 2016 22:42:45 +1100 (AEDT) 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 1cJfIC-00060o-6q; Wed, 21 Dec 2016 11:42:44 +0000 Received: from us01smtprelay-2.synopsys.com ([198.182.60.111] helo=smtprelay.synopsys.com) by bombadil.infradead.org with esmtps (Exim 4.85_2 #1 (Red Hat Linux)) id 1cJfI9-0005wD-I7 for linux-snps-arc@lists.infradead.org; Wed, 21 Dec 2016 11:42:42 +0000 Received: from mailhost.synopsys.com (mailhost1.synopsys.com [10.12.238.239]) by smtprelay.synopsys.com (Postfix) with ESMTP id 6849D10C034A; Wed, 21 Dec 2016 03:42:20 -0800 (PST) Received: from mailhost.synopsys.com (localhost [127.0.0.1]) by mailhost.synopsys.com (Postfix) with ESMTP id 46937671; Wed, 21 Dec 2016 03:42:20 -0800 (PST) Received: from abrodkin-7440l.internal.synopsys.com (abrodkin-7440l.internal.synopsys.com [10.121.8.73]) by mailhost.synopsys.com (Postfix) with ESMTP id A3D9466D; Wed, 21 Dec 2016 03:42:18 -0800 (PST) From: Alexey Brodkin To: linux-snps-arc@lists.infradead.org Subject: [PATCH] arc: enable unaligned access in kernel mode Date: Wed, 21 Dec 2016 14:40:54 +0300 Message-Id: <1482320454-5731-1-git-send-email-abrodkin@synopsys.com> X-Mailer: git-send-email 2.7.4 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20161221_034241_646424_A74AD816 X-CRM114-Status: UNSURE ( 7.15 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -3.3 (---) X-Spam-Report: SpamAssassin version 3.4.0 on bombadil.infradead.org summary: Content analysis details: (-3.3 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [198.182.60.111 listed in list.dnswl.org] -0.0 RCVD_IN_MSPIKE_H3 RBL: Good reputation (+3) [198.182.60.111 listed in wl.mailspike.net] -1.4 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] -0.0 RCVD_IN_MSPIKE_WL Mailspike good senders X-BeenThere: linux-snps-arc@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: Linux on Synopsys ARC Processors List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Vineet Gupta , Alexey Brodkin , linux-kernel@vger.kernel.org, John Crispin MIME-Version: 1.0 Sender: "linux-snps-arc" Errors-To: linux-snps-arc-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org This enables misaligned access handling even in kernel mode. Some wireless drivers (ath9k-htc and mt7601u) use misaligned accesses here and there and to cope with that without fixing stuff in the drivers we're just gracefully handling it on ARC. Signed-off-by: Alexey Brodkin Cc: John Crispin --- arch/arc/kernel/unaligned.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/arc/kernel/unaligned.c b/arch/arc/kernel/unaligned.c index abd961f3e763..58b7415e47ca 100644 --- a/arch/arc/kernel/unaligned.c +++ b/arch/arc/kernel/unaligned.c @@ -205,8 +205,8 @@ int misaligned_fixup(unsigned long address, struct pt_regs *regs, struct disasm_state state; char buf[TASK_COMM_LEN]; - /* handle user mode only and only if enabled by sysadmin */ - if (!user_mode(regs) || !unaligned_enabled) + /* handle only if enabled by sysadmin */ + if (!unaligned_enabled) return 1; if (no_unaligned_warning) {