Drivers: hv: vmbus: Replace smp_store_mb() with virt_store_mb()

Following the recommendation in Documentation/memory-barriers.txt for
virtual machine guests.

Fixes: 8b6a877c060ed ("Drivers: hv: vmbus: Replace the per-CPU channel lists with a global array of channels")
Signed-off-by: Andrea Parri (Microsoft) <parri.andrea@gmail.com>
Link: https://lore.kernel.org/r/20220328154457.100872-1-parri.andrea@gmail.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>

diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
index 6037587..67be812 100644 (file)
--- a/drivers/hv/channel_mgmt.c
+++ b/drivers/hv/channel_mgmt.c
@@ -380,7 +380,7 @@ void vmbus_channel_map_relid(struct vmbus_channel *channel)
         * execute:
         *
         *  (a) In the "normal (i.e., not resuming from hibernation)" path,
-        *      the full barrier in smp_store_mb() guarantees that the store
+        *      the full barrier in virt_store_mb() guarantees that the store
         *      is propagated to all CPUs before the add_channel_work work
         *      is queued.  In turn, add_channel_work is queued before the
         *      channel's ring buffer is allocated/initialized and the
@@ -392,14 +392,14 @@ void vmbus_channel_map_relid(struct vmbus_channel *channel)
         *      recv_int_page before retrieving the channel pointer from the
         *      array of channels.
         *
-        *  (b) In the "resuming from hibernation" path, the smp_store_mb()
+        *  (b) In the "resuming from hibernation" path, the virt_store_mb()
         *      guarantees that the store is propagated to all CPUs before
         *      the VMBus connection is marked as ready for the resume event
         *      (cf. check_ready_for_resume_event()).  The interrupt handler
         *      of the VMBus driver and vmbus_chan_sched() can not run before
         *      vmbus_bus_resume() has completed execution (cf. resume_noirq).
         */
-       smp_store_mb(
+       virt_store_mb(
                vmbus_connection.channels[channel->offermsg.child_relid],
                channel);
 }