diff --git a/include/linux/sched/deadline.h b/include/linux/sched/deadline.h
index 9d303b8847df28e4851746515fd9ee388e1cf8e1..9089a2ae913ddf4d12f10a7bcff209bbd1894400 100644
--- a/include/linux/sched/deadline.h
+++ b/include/linux/sched/deadline.h
@@ -21,4 +21,9 @@ static inline int dl_task(struct task_struct *p)
 	return dl_prio(p->prio);
 }
 
+static inline bool dl_time_before(u64 a, u64 b)
+{
+	return (s64)(a - b) < 0;
+}
+
 #endif /* _SCHED_DEADLINE_H */
diff --git a/kernel/sched/cpudeadline.c b/kernel/sched/cpudeadline.c
index c6acb07466bb82b1143af4aba1da5e483f628e4f..5a75b08cfd8576d830adf9fc9df52d807c052be9 100644
--- a/kernel/sched/cpudeadline.c
+++ b/kernel/sched/cpudeadline.c
@@ -31,11 +31,6 @@ static inline int right_child(int i)
 	return (i << 1) + 2;
 }
 
-static inline int dl_time_before(u64 a, u64 b)
-{
-	return (s64)(a - b) < 0;
-}
-
 static void cpudl_exchange(struct cpudl *cp, int a, int b)
 {
 	int cpu_a = cp->elements[a].cpu, cpu_b = cp->elements[b].cpu;
diff --git a/kernel/sched/cpudeadline.h b/kernel/sched/cpudeadline.h
index 1a0a6ef2fbe1be030e32895571a1d267e26579e4..fcbdf83fed7e31afc4ee916f94d272d03117a2c2 100644
--- a/kernel/sched/cpudeadline.h
+++ b/kernel/sched/cpudeadline.h
@@ -2,6 +2,7 @@
 #define _LINUX_CPUDL_H
 
 #include <linux/sched.h>
+#include <linux/sched/deadline.h>
 
 #define IDX_INVALID     -1
 
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 3845a711c65e10721c678de9a5f483208bc5a1fc..af6f252e7e34d51fc4368bdc7a264a5da894e26a 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -118,11 +118,6 @@ static inline int task_has_dl_policy(struct task_struct *p)
 	return dl_policy(p->policy);
 }
 
-static inline bool dl_time_before(u64 a, u64 b)
-{
-	return (s64)(a - b) < 0;
-}
-
 /*
  * Tells if entity @a should preempt entity @b.
  */