diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 609948e..cd72ace 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -319,6 +319,8 @@
 extern void ftrace_call(void);
 extern void mcount_call(void);
 
+void ftrace_modify_all_code(int command);
+
 #ifndef FTRACE_ADDR
 #define FTRACE_ADDR ((unsigned long)ftrace_caller)
 #endif