trace_probe_init
ret = trace_probe_init(&ep->tp, this_event, group, false, nargs);
ret = trace_probe_init(&tf->tp, event, group, false, nargs);
ret = trace_probe_init(&tk->tp, event, group, false, nargs);
int trace_probe_init(struct trace_probe *tp, const char *event,
ret = trace_probe_init(&tu->tp, event, group, true, nargs);