From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758621AbYFPV7K (ORCPT ); Mon, 16 Jun 2008 17:59:10 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756544AbYFPV65 (ORCPT ); Mon, 16 Jun 2008 17:58:57 -0400 Received: from gw.goop.org ([64.81.55.164]:38879 "EHLO mail.goop.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756453AbYFPV64 (ORCPT ); Mon, 16 Jun 2008 17:58:56 -0400 Message-ID: <4856E1F5.2000002@goop.org> Date: Mon, 16 Jun 2008 14:58:13 -0700 From: Jeremy Fitzhardinge User-Agent: Thunderbird 2.0.0.14 (X11/20080501) MIME-Version: 1.0 To: the arch/x86 maintainers CC: Linux Kernel Mailing List , Isaku Yamahata , Samuel Thibault , Nick Piggin Subject: [PATCH] xen: Use wmb instead of rmb in xen_evtchn_do_upcall(). X-Enigmail-Version: 0.95.6 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Isaku Yamahata This patch is ported one from 534:77db69c38249 of linux-2.6.18-xen.hg. Use wmb instead of rmb to enforce ordering between evtchn_upcall_pending and evtchn_pending_sel stores in xen_evtchn_do_upcall(). Cc: Samuel Thibault Signed-off-by: Isaku Yamahata --- drivers/xen/events.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) =================================================================== --- a/drivers/xen/events.c +++ b/drivers/xen/events.c @@ -529,7 +529,7 @@ void xen_evtchn_do_upcall(struct pt_regs *regs) #ifndef CONFIG_X86 /* No need for a barrier -- XCHG is a barrier on x86. */ /* Clear master flag /before/ clearing selector flag. */ - rmb(); + wmb(); #endif pending_words = xchg(&vcpu_info->evtchn_pending_sel, 0); while (pending_words != 0) { -- 1.5.3