1 files changed, 8 insertions, 2 deletions

diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 8cb215b239d5..f69f86788c2b 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -223,8 +223,6 @@ void trace_function(struct trace_array *tr,
                     unsigned long parent_ip,
                     unsigned long flags);
 
-void tracing_start_function_trace(void);
-void tracing_stop_function_trace(void);
 void tracing_start_cmdline_record(void);
 void tracing_stop_cmdline_record(void);
 int register_tracer(struct tracer *type);
@@ -241,6 +239,14 @@ void update_max_tr_single(struct trace_array *tr,
 
 extern cycle_t ftrace_now(int cpu);
 
+#ifdef CONFIG_FTRACE
+void tracing_start_function_trace(void);
+void tracing_stop_function_trace(void);
+#else
+# define tracing_start_function_trace()         do { } while (0)
+# define tracing_stop_function_trace()          do { } while (0)
+#endif
+
 #ifdef CONFIG_CONTEXT_SWITCH_TRACER
 typedef void
 (*tracer_switch_func_t)(void *private,