Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750856Ab3IZNpJ (ORCPT ); Thu, 26 Sep 2013 09:45:09 -0400 Received: from us01smtp3.synopsys.com ([198.182.44.81]:59940 "EHLO hermes.synopsys.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750710Ab3IZNpG (ORCPT ); Thu, 26 Sep 2013 09:45:06 -0400 From: Mischa Jonker To: Vineet.Gupta1@synopsys.com, arnd@arndb.de, linux-kernel@vger.kernel.org, arc-linux-dev@synopsys.com Cc: Mischa Jonker Subject: [PATCH 1/2] ARC: Handle zero-overhead-loop in unaligned access handler Date: Thu, 26 Sep 2013 15:44:56 +0200 Message-Id: <1380203096-5842-1-git-send-email-mjonker@synopsys.com> X-Mailer: git-send-email 1.7.9.5 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1051 Lines: 35 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 --- arch/arc/kernel/unaligned.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/arc/kernel/unaligned.c b/arch/arc/kernel/unaligned.c index c0f832f..00ad070 100644 --- a/arch/arc/kernel/unaligned.c +++ b/arch/arc/kernel/unaligned.c @@ -233,6 +233,12 @@ int misaligned_fixup(unsigned long address, struct pt_regs *regs, 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; -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/