perf: Move perf_event_fasync() to perf_event.h

This will allow it to be called from perf_output_wakeup().
Signed-off-by: Kyle Huey <khuey@kylehuey.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20240413141618.4160-2-khuey@kylehuey.com

include/linux/perf_event.h

@@ -1686,6 +1686,14 @@ perf_event_addr_filters(struct perf_event *event)
 	return ifh;
 }
 
+static inline struct fasync_struct **perf_event_fasync(struct perf_event *event)
+{
+	/* Only the parent has fasync state */
+	if (event->parent)
+		event = event->parent;
+	return &event->fasync;
+}
+
 extern void perf_event_addr_filters_sync(struct perf_event *event);
 extern void perf_report_aux_output_id(struct perf_event *event, u64 hw_id);
 

kernel/events/core.c

@@ -6703,14 +6703,6 @@ static const struct file_operations perf_fops = {
  * to user-space before waking everybody up.
  */
 
-static inline struct fasync_struct **perf_event_fasync(struct perf_event *event)
-{
-	/* only the parent has fasync state */
-	if (event->parent)
-		event = event->parent;
-	return &event->fasync;
-}
-
 void perf_event_wakeup(struct perf_event *event)
 {
 	ring_buffer_wakeup(event);