This is a note to let you know that I've just added the patch titled
drivers: hv: switch to use mb() instead of smp_mb()
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drivers-hv-switch-to-use-mb-instead-of-smp_mb.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 35848f68b07df3f917cb13fc3c134718669f569b Mon Sep 17 00:00:00 2001
From: Jason Wang <jasowang@xxxxxxxxxx>
Date: Tue, 18 Jun 2013 13:04:23 +0800
Subject: drivers: hv: switch to use mb() instead of smp_mb()
From: Jason Wang <jasowang@xxxxxxxxxx>
commit 35848f68b07df3f917cb13fc3c134718669f569b upstream.
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 <jasowang@xxxxxxxxxx>
Cc: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>
Signed-off-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
[bwh: Backported to 3.2:
- Drop changes to functions that don't exist here
- hv_ringbuffer_write() has only a write memory barrier]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
[hq: Backported to 3.4:
- Add the change in hv_ringbuffer_read]
Signed-off-by: Qiang Huang <h.huangqiang@xxxxxxxxxx>
---
drivers/hv/ring_buffer.c | 4 ++--
drivers/hv/vmbus_drv.c | 2 +-
2 files changed, 3 insertions(+), 3 deletions(-)
--- a/drivers/hv/ring_buffer.c
+++ b/drivers/hv/ring_buffer.c
@@ -383,7 +383,7 @@ int hv_ringbuffer_write(struct hv_ring_b
sizeof(u64));
/* Make sure we flush all writes before updating the writeIndex */
- smp_wmb();
+ wmb();
/* Now, update the write location */
hv_set_next_write_location(outring_info, next_write_location);
@@ -485,7 +485,7 @@ int hv_ringbuffer_read(struct hv_ring_bu
/* 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);
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -466,7 +466,7 @@ static void vmbus_on_msg_dpc(unsigned lo
* will not deliver any more messages since there is
* no empty slot
*/
- smp_mb();
+ mb();
if (msg->header.message_flags.msg_pending) {
/*
Patches currently in stable-queue which might be from jasowang@xxxxxxxxxx are
queue-3.4/drivers-hv-switch-to-use-mb-instead-of-smp_mb.patch
queue-3.4/revert-macvlan-fix-checksums-error-when-we-are-in-bridge-mode.patch
queue-3.4/act_mirred-do-not-drop-packets-when-fails-to-mirror-it.patch
--
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