From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756296Ab3AROyl (ORCPT ); Fri, 18 Jan 2013 09:54:41 -0500 Received: from moutng.kundenserver.de ([212.227.17.9]:59973 "EHLO moutng.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756266Ab3AROyj (ORCPT ); Fri, 18 Jan 2013 09:54:39 -0500 From: Arnd Bergmann To: Vineet Gupta Subject: Re: [PATCH v2 56/76] ARC: Unaligned access emulation Date: Fri, 18 Jan 2013 14:54:36 +0000 User-Agent: KMail/1.12.2 (Linux/3.7.0-7-generic; KDE/4.3.2; x86_64; ; ) Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, Tim Yao References: <1358511930-7424-1-git-send-email-vgupta@synopsys.com> <1358511930-7424-57-git-send-email-vgupta@synopsys.com> In-Reply-To: <1358511930-7424-57-git-send-email-vgupta@synopsys.com> MIME-Version: 1.0 Content-Type: Text/Plain; charset="iso-8859-15" Content-Transfer-Encoding: 7bit Message-Id: <201301181454.36279.arnd@arndb.de> X-Provags-ID: V02:K0:nwQBE8N4tDzblaxQb2jFcyqLVV8pfV6GRj29XVTdebE MAi1hyf39xN+rXAw8iVtEPsPG5GZ2CkPWijHt72yAuIc2NlQRf I4qb7aiZfpP7zR2TQTksG0ct13wBG0SV9hSpMJivQlPvRNxckL uhvrNLuDm2sWc2ueY8QcAEDQqcOqRKZ7LF9gIL1ys56pUvGagB raHkEFq+eD2XZr7AY0INZbjsbITsInb0qZaJARSXhS0WdCMkLL IRT3NQozRqlY0fIGlDiYjRfqhbvW9WkglowtJq6Qc3g5MQfECp CputatM4YdA9TINCP+z413r4AR7++4Zl+kcNK9DDrSxvcGKLvx GOusW3h4r2YzmTB0zZhs= Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Friday 18 January 2013, Vineet Gupta wrote: > ARC700 doesn't natively support unaligned access, but can be emulated > -Unaligned Access Exception > -Disassembly at the Fault address to find the exact insn (long/short) > > Also per Arnd's comment, we runtime control it using 2 sysctl knobs: > * SYSCTL_ARCH_UNALIGN_ALLOW: Runtime enable/disble > * SYSCTL_ARCH_UNALIGN_NO_WARN: Warn on each emulation attempt > > Originally contributed by Tim Yao > > Signed-off-by: Vineet Gupta > Cc: Tim Yao Acked-by: Arnd Bergmann