--- zzzz-none-000/linux-4.1.52/include/asm-generic/rwsem.h	2018-05-28 02:26:45.000000000 +0000
+++ bcm63-7530ax-731/linux-4.1.52/include/asm-generic/rwsem.h	2022-03-02 11:37:13.000000000 +0000
@@ -53,7 +53,7 @@
 /*
  * lock for writing
  */
-static inline void __down_write_nested(struct rw_semaphore *sem, int subclass)
+static inline void __down_write_nested(struct rw_semaphore *sem, int subclass __maybe_unused)
 {
 	long tmp;