--- zzzz-none-000/linux-3.10.107/include/linux/radix-tree.h	2017-06-27 09:49:32.000000000 +0000
+++ vr9-7490-729/linux-3.10.107/include/linux/radix-tree.h	2021-11-10 11:53:56.000000000 +0000
@@ -163,7 +163,7 @@
  * 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));
 }