diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 654fd65..e2c06b2 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -473,12 +473,14 @@
 
 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
 
+#ifdef CONFIG_TRACER_MAX_TRACE
 extern unsigned long tracing_max_latency;
 extern unsigned long tracing_thresh;
 
 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
 void update_max_tr_single(struct trace_array *tr,
 			  struct task_struct *tsk, int cpu);
+#endif /* CONFIG_TRACER_MAX_TRACE */
 
 #ifdef CONFIG_STACKTRACE
 void ftrace_trace_stack(struct trace_array *tr, unsigned long flags,