From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758306Ab3HMQdP (ORCPT ); Tue, 13 Aug 2013 12:33:15 -0400 Received: from hrndva-omtalb.mail.rr.com ([71.74.56.122]:4213 "EHLO hrndva-omtalb.mail.rr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757854Ab3HMQ0v (ORCPT ); Tue, 13 Aug 2013 12:26:51 -0400 X-Authority-Analysis: v=2.0 cv=P6i4d18u c=1 sm=0 a=Sro2XwOs0tJUSHxCKfOySw==:17 a=Drc5e87SC40A:10 a=Ciwy3NGCPMMA:10 a=JIRhoisSancA:10 a=5SG0PmZfjMsA:10 a=bbbx4UPp9XUA:10 a=meVymXHHAAAA:8 a=KGjhK52YXX0A:10 a=GA9nCqaG_WIA:10 a=20KFwNOVAAAA:8 a=yMhMjlubAAAA:8 a=VwQbUJbxAAAA:8 a=ag1SF4gXAAAA:8 a=0cRFCE-MzT_khLpehsgA:9 a=jEp0ucaQiEUA:10 a=-AOE9ft50oIA:10 a=1TSTQ8KKaH4A:10 a=jeBq3FmKZ4MA:10 a=u5mEQeM0wOFTezRi:21 a=ph9TMAlYN4lwFIry:21 a=Sro2XwOs0tJUSHxCKfOySw==:117 X-Cloudmark-Score: 0 X-Authenticated-User: X-Originating-IP: 67.255.60.225 Message-Id: <20130813155834.826743057@goodmis.org> User-Agent: quilt/0.60-1 Date: Tue, 13 Aug 2013 11:58:05 -0400 From: Steven Rostedt To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Jason Wang , Haiyang Zhang , "K. Y. Srinivasan" , Greg Kroah-Hartman Subject: [71/88] drivers: hv: switch to use mb() instead of smp_mb() References: <20130813155654.069291373@goodmis.org> Content-Disposition: inline; filename=0071-drivers-hv-switch-to-use-mb-instead-of-smp_mb.patch Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.6.11.7-rc1 stable review patch. If anyone has any objections, please let me know. ------------------ From: Jason Wang [ Upstream commit 35848f68b07df3f917cb13fc3c134718669f569b ] Even if guest were compiled without SMP support, it could not assume that host wasn't. So switch to use mb() instead of smp_mb() to force memory barriers for UP guest. Signed-off-by: Jason Wang Cc: Haiyang Zhang Cc: stable Signed-off-by: K. Y. Srinivasan Signed-off-by: Greg Kroah-Hartman Signed-off-by: Steven Rostedt --- drivers/hv/ring_buffer.c | 2 +- drivers/hv/vmbus_drv.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/hv/ring_buffer.c b/drivers/hv/ring_buffer.c index 7233c88..14aa6fe 100644 --- a/drivers/hv/ring_buffer.c +++ b/drivers/hv/ring_buffer.c @@ -454,7 +454,7 @@ int hv_ringbuffer_read(struct hv_ring_buffer_info *inring_info, void *buffer, /* Make sure all reads are done before we update the read index since */ /* the writer may start writing to the read area once the read index */ /*is updated */ - smp_mb(); + mb(); /* Update the read index */ hv_set_next_read_location(inring_info, next_read_location); diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c index 4748086..db5fc10 100644 --- a/drivers/hv/vmbus_drv.c +++ b/drivers/hv/vmbus_drv.c @@ -466,7 +466,7 @@ static void vmbus_on_msg_dpc(unsigned long data) * will not deliver any more messages since there is * no empty slot */ - smp_mb(); + mb(); if (msg->header.message_flags.msg_pending) { /* -- 1.7.10.4