--- zzzz-none-000/linux-4.1.38/include/linux/radix-tree.h	2017-01-18 18:48:06.000000000 +0000
+++ bcm63-7582-715/linux-4.1.38/include/linux/radix-tree.h	2020-11-25 10:06:48.000000000 +0000
@@ -207,7 +207,7 @@
  * must hold the tree lock to prevent parallel updates.
  */
 static inline void *radix_tree_deref_slot_protected(void **pslot,
-							spinlock_t *treelock)
+				    spinlock_t *treelock __maybe_unused)
 {
 	return rcu_dereference_protected(*pslot, lockdep_is_held(treelock));
 }