From mboxrd@z Thu Jan 1 00:00:00 1970 Received: with ECARTIS (v1.0.0; list linux-mips); Sun, 11 Oct 2009 08:07:46 +0200 (CEST) Received: from dns1.mips.com ([63.167.95.197]:35208 "EHLO dns1.mips.com" rhost-flags-OK-OK-OK-OK) by ftp.linux-mips.org with ESMTP id S1491912AbZJKGHj (ORCPT ); Sun, 11 Oct 2009 08:07:39 +0200 Received: from MTVEXCHANGE.mips.com ([192.168.36.60]) by dns1.mips.com (8.13.8/8.13.8) with ESMTP id n9B67VUo023999 for ; Sat, 10 Oct 2009 23:07:32 -0700 Received: from [192.168.3.60] ([192.168.3.60]) by MTVEXCHANGE.mips.com with Microsoft SMTPSVC(6.0.3790.3959); Sat, 10 Oct 2009 23:07:31 -0700 Message-ID: <4AD17619.1000201@mips.com> Date: Sat, 10 Oct 2009 23:07:21 -0700 From: Chris Dearman User-Agent: Thunderbird 2.0.0.23 (Windows/20090812) MIME-Version: 1.0 To: linux-mips Subject: [PATCH] Avoid potential hazard on Context register Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 11 Oct 2009 06:07:31.0505 (UTC) FILETIME=[1E472210:01CA4A39] Return-Path: X-Envelope-To: <"|/home/ecartis/ecartis -s linux-mips"> (uid 0) X-Orcpt: rfc822;linux-mips@linux-mips.org Original-Recipient: rfc822;linux-mips@linux-mips.org X-archive-position: 24219 X-ecartis-version: Ecartis v1.0.0 Sender: linux-mips-bounce@linux-mips.org Errors-to: linux-mips-bounce@linux-mips.org X-original-sender: chris@mips.com Precedence: bulk X-list: linux-mips set_saved_sp reads Context register. Avoid reading stale value from earlier incomplete write Signed-off-by: Chris Dearman --- arch/mips/kernel/head.S | 1 + 1 files changed, 1 insertions(+), 0 deletions(-) diff --git a/arch/mips/kernel/head.S b/arch/mips/kernel/head.S index 531ce7b..ea695d9 100644 --- a/arch/mips/kernel/head.S +++ b/arch/mips/kernel/head.S @@ -191,6 +191,7 @@ NESTED(kernel_entry, 16, sp) # kernel entry point /* Set the SP after an empty pt_regs. */ PTR_LI sp, _THREAD_SIZE - 32 - PT_SIZE PTR_ADDU sp, $28 + back_to_back_c0_hazard set_saved_sp sp, t0, t1 PTR_SUBU sp, 4 * SZREG # init stack pointer