--- zzzz-none-000/linux-4.1.38/include/asm-generic/rwsem.h	2017-01-18 18:48:06.000000000 +0000
+++ bcm63-7582-715/linux-4.1.38/include/asm-generic/rwsem.h	2020-11-25 10:06:48.000000000 +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;