[PATCH] NLM: Add lockd reference counting and clean up lockd startup and shutdown

[Christoph Hellwig]

> +	mutex_lock(&nlmsvc_mutex);
> +	while (atomic_read(&nlmsvc_ref) != 0) {

might be better to do the refcounting outside the thread and use the
kthread api, which is something we still need to do for lockd anyway.