There's a 32 bit hole just after type. It's best to give it a name, this way compiler is forced to initialize it with rest of the structure. Reported-by: Kevin Easton <kevin@xxxxxxxxxxx> Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx> --- include/uapi/linux/vhost.h | 1 + 1 file changed, 1 insertion(+) diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h index c51f8e5..5a8ad06 100644 --- a/include/uapi/linux/vhost.h +++ b/include/uapi/linux/vhost.h @@ -68,6 +68,7 @@ struct vhost_iotlb_msg { struct vhost_msg { int type; + int padding0; union { struct vhost_iotlb_msg iotlb; __u8 padding[64]; -- MST