diff options
| author | Jason Wang <jasowang@redhat.com> | 2013-06-18 13:04:23 +0800 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2013-07-27 05:34:12 +0100 |
| commit | e4af376d04b03ff3ab2f27701bb183da6ee2aaff (patch) | |
| tree | d00cc4ac3e75cc70e526296160eb5489a1615633 | |
| parent | a07e6fe002db3ef37149125322ca98d42bf04a8a (diff) | |
| download | lwn-e4af376d04b03ff3ab2f27701bb183da6ee2aaff.tar.gz lwn-e4af376d04b03ff3ab2f27701bb183da6ee2aaff.zip | |
drivers: hv: switch to use mb() instead of smp_mb()
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@redhat.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[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@decadent.org.uk>
| -rw-r--r-- | drivers/hv/ring_buffer.c | 2 | ||||
| -rw-r--r-- | 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 8af25a097d75..810658e8211a 100644 --- a/drivers/hv/ring_buffer.c +++ b/drivers/hv/ring_buffer.c @@ -383,7 +383,7 @@ int hv_ringbuffer_write(struct hv_ring_buffer_info *outring_info, 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); diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c index d2d0a2a9676d..44442d5e5a93 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) { /* |