xenbus_notify
list_create(¬ify_list, sizeof (struct xenbus_notify),
offsetof(struct xenbus_notify, list));
struct xenbus_notify *xbn, *xnp;
xbn = kmem_alloc(sizeof (struct xenbus_notify), KM_SLEEP);
kmem_free(xbn, sizeof (struct xenbus_notify));
struct xenbus_notify *xnp;