diff --git a/kernel/sched/batch.c b/kernel/sched/batch.c
index 8d0501fa056c59dfb65c8ac1fdfbb3d8b13921ae..2915775142a2a91cad8c99e66d618a35c7d2ef53 100644
--- a/kernel/sched/batch.c
+++ b/kernel/sched/batch.c
@@ -160,7 +160,7 @@ struct task_struct *pick_next_task_bt(struct rq *rq, struct task_struct *prev, s
 	return NULL;
 }
 
-struct task_struct *__pick_next_task_bt(struct rq *rq, struct task_struct *prev)
+static struct task_struct *__pick_next_task_bt(struct rq *rq, struct task_struct *prev)
 {
 	return pick_next_task_bt(rq, prev, NULL);
 }
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 45cd9f305a3b4fbd737c7ca1c27475497651c152..23d2031bac96ea07014436b1667b39d730d5d9ae 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -10228,8 +10228,8 @@ llc_detach_next_task(struct cfs_rq *cfs_rq, struct rq *dst_rq)
 	return NULL;
 }
 
-int llc_get_task(struct rq *dst_rq, struct rq_flags *dst_rf,
-		 bool *locked, int src_cpu)
+static int llc_get_task(struct rq *dst_rq, struct rq_flags *dst_rf,
+			bool *locked, int src_cpu)
 {
 	struct task_struct *p = NULL;
 	struct rq_flags rf;
diff --git a/kernel/sched/ht_isolate.c b/kernel/sched/ht_isolate.c
index f8d6709ec7c76612a38f5f3b2edf94aa13d95dd4..384230da201ec165a9d6ebc031d915477c86fce8 100644
--- a/kernel/sched/ht_isolate.c
+++ b/kernel/sched/ht_isolate.c
@@ -4,7 +4,7 @@
 
 int sysctl_ht_isolate;
 
-bool may_kick_sibling(int cpu)
+static bool may_kick_sibling(int cpu)
 {
 	struct rq *rq = cpu_rq(cpu);
 	return rq->ht_sensi_type == HT_SENSITIV_TYPE ? true : false;