1 files changed, 4 insertions, 0 deletions

diff --git a/kernel/trace/trace_output.h b/kernel/trace/trace_output.h
index ac240e76eb01..d38bec4a9c30 100644
--- a/kernel/trace/trace_output.h
+++ b/kernel/trace/trace_output.h
@@ -27,6 +27,10 @@ extern struct trace_event *ftrace_find_event(int type);
 extern enum print_line_t trace_nop_print(struct trace_iterator *iter,
                                          int flags);
 
+/* used by module unregistering */
+extern int __unregister_ftrace_event(struct trace_event *event);
+extern struct rw_semaphore trace_event_mutex;
+
 #define MAX_MEMHEX_BYTES        8
 #define HEX_CHARS               (MAX_MEMHEX_BYTES*2 + 1)