From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761581Ab3JPRqF (ORCPT ); Wed, 16 Oct 2013 13:46:05 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:35542 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1761291Ab3JPRpc (ORCPT ); Wed, 16 Oct 2013 13:45:32 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Mischa Jonker , Vineet Gupta Subject: [ 17/69] ARC: Handle zero-overhead-loop in unaligned access handler Date: Wed, 16 Oct 2013 10:44:26 -0700 Message-Id: <20131016174314.982289638@linuxfoundation.org> X-Mailer: git-send-email 1.8.4.3.gca3854a In-Reply-To: <20131016174312.844154919@linuxfoundation.org> References: <20131016174312.844154919@linuxfoundation.org> User-Agent: quilt/0.60-5.1.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.10-stable review patch. If anyone has any objections, please let me know. ------------------ From: Mischa Jonker commit c11eb222fd7d4db91196121dbf854178505d2751 upstream. If a load or store is the last instruction in a zero-overhead-loop, and it's misaligned, the loop would execute only once. This fixes that problem. Signed-off-by: Mischa Jonker Signed-off-by: Vineet Gupta Signed-off-by: Greg Kroah-Hartman --- arch/arc/kernel/unaligned.c | 6 ++++++ 1 file changed, 6 insertions(+) --- a/arch/arc/kernel/unaligned.c +++ b/arch/arc/kernel/unaligned.c @@ -233,6 +233,12 @@ int misaligned_fixup(unsigned long addre regs->status32 &= ~STATUS_DE_MASK; } else { regs->ret += state.instr_len; + + /* handle zero-overhead-loop */ + if ((regs->ret == regs->lp_end) && (regs->lp_count)) { + regs->ret = regs->lp_start; + regs->lp_count--; + } } return 0;