diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index d9a970568be96..c40e508d54e98 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -677,19 +677,6 @@ struct cgroup_subsys_state *css_parent(struct cgroup_subsys_state *css)
 		return &parent_cgrp->dummy_css;
 }
 
-/**
- * cgroup_css - obtain a cgroup's css for the specified subsystem
- * @cgrp: the cgroup of interest
- * @subsys_id: the subsystem of interest
- *
- * Return @cgrp's css (cgroup_subsys_state) associated with @subsys_id.
- */
-static inline struct cgroup_subsys_state *cgroup_css(struct cgroup *cgrp,
-						     int subsys_id)
-{
-	return cgrp->subsys[subsys_id];
-}
-
 /**
  * task_css_set_check - obtain a task's css_set with extra access conditions
  * @task: the task to obtain css_set for
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index e5bfb2a81dcb5..c02a288a4e3d9 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -222,6 +222,19 @@ static int cgroup_destroy_locked(struct cgroup *cgrp);
 static int cgroup_addrm_files(struct cgroup *cgrp, struct cftype cfts[],
 			      bool is_add);
 
+/**
+ * cgroup_css - obtain a cgroup's css for the specified subsystem
+ * @cgrp: the cgroup of interest
+ * @subsys_id: the subsystem of interest
+ *
+ * Return @cgrp's css (cgroup_subsys_state) associated with @subsys_id.
+ */
+static struct cgroup_subsys_state *cgroup_css(struct cgroup *cgrp,
+					      int subsys_id)
+{
+	return cgrp->subsys[subsys_id];
+}
+
 /* convenient tests for these bits */
 static inline bool cgroup_is_dead(const struct cgroup *cgrp)
 {