perf_event__handler_t process);
int perf_event__process_attr(struct perf_tool *tool, union perf_event *event,
struct perf_evlist **pevlist);
-int perf_event__process_event_update(struct perf_tool *tool __maybe_unused,
+int perf_event__process_event_update(struct perf_tool *tool,
union perf_event *event,
struct perf_evlist **pevlist);
size_t perf_event__fprintf_event_update(union perf_event *event, FILE *fp);