diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 50723e5..ccbd810 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -1028,6 +1028,10 @@
 extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr);
 extern int event_trace_del_tracer(struct trace_array *tr);
 
+extern struct ftrace_event_file *find_event_file(struct trace_array *tr,
+						 const char *system,
+						 const char *event);
+
 static inline void *event_file_data(struct file *filp)
 {
 	return ACCESS_ONCE(file_inode(filp)->i_private);