--- zzzz-none-000/linux-4.1.52/include/linux/radix-tree.h	2018-05-28 02:26:45.000000000 +0000
+++ bcm63-7530ax-731/linux-4.1.52/include/linux/radix-tree.h	2022-03-02 11:37:13.000000000 +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));
 }