int notify_peer_device_state_change(struct sk_buff *skb,
				     unsigned int seq,
				     struct drbd_peer_device_state_change *p,
				     enum drbd_notification_type type)
int notify_peer_device_state_change(struct sk_buff *skb,
				     unsigned int seq,
				     void *state_change,
				     enum drbd_notification_type type)