context_wait_for_deregister_to_register
deregister = context_wait_for_deregister_to_register(ce);
if (context_wait_for_deregister_to_register(ce) ||
if (context_wait_for_deregister_to_register(ce)) {
GEM_BUG_ON(context_wait_for_deregister_to_register(ce));