[PATCH 1/3] hw/virtio: Document virtio_queue_packed_empty_rcu is called within RCU

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

While virtio_queue_packed_empty_rcu() uses the '_rcu' suffix,
it is not obvious it is called within rcu_read_lock(). All other
functions from this file called with the RCU locked have a comment
describing it. Document this one similarly for consistency.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 hw/virtio/virtio.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index 874377f37a7..a5214bca612 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -634,6 +634,7 @@ static int virtio_queue_split_empty(VirtQueue *vq)
     return empty;
 }
 
+/* Called within rcu_read_lock().  */
 static int virtio_queue_packed_empty_rcu(VirtQueue *vq)
 {
     struct VRingPackedDesc desc;
-- 
2.31.1