diff --git a/include/linux/sched.h b/include/linux/sched.h
index 75e6e60..576d838 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1836,7 +1836,8 @@
 extern int sched_clock_stable;
 #endif
 
-extern unsigned long long sched_clock(void);
+/* ftrace calls sched_clock() directly */
+extern unsigned long long notrace sched_clock(void);
 
 extern void sched_clock_init(void);
 extern u64 sched_clock_cpu(int cpu);