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[PULL,20/35] hw/virtio: Document virtio_queue_packed_empty_rcu is called within RCU

Message ID 20210904213506.486886-21-mst@redhat.com
State New
Headers show
Series [PULL,01/35] vhost-vdpa: Do not send empty IOTLB update batches | expand

Commit Message

Michael S. Tsirkin Sept. 4, 2021, 9:36 p.m. UTC 
From: 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>
Message-Id: <20210826172658.2116840-2-philmd@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 hw/virtio/virtio.c | 1 +
 1 file changed, 1 insertion(+)
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Patch

diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index 874377f37a..a5214bca61 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;