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-rw-r--r--include/linux/perf_event.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 05253af70ce9..e85cd1c0eaf3 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -444,7 +444,8 @@ struct pmu {
/*
* Will return the value for perf_event_mmap_page::index for this event,
- * if no implementation is provided it will default to: event->hw.idx + 1.
+ * if no implementation is provided it will default to 0 (see
+ * perf_event_idx_default).
*/
int (*event_idx) (struct perf_event *event); /*optional */