__set_synth_event_print_fmt 1017 kernel/trace/trace_events_hist.c 	len = __set_synth_event_print_fmt(event, NULL, 0);
__set_synth_event_print_fmt 1024 kernel/trace/trace_events_hist.c 	__set_synth_event_print_fmt(event, print_fmt, len + 1);