--- zzzz-none-000/linux-4.1.38/include/linux/mutex.h	2017-01-18 18:48:06.000000000 +0000
+++ bcm63-7582-715/linux-4.1.38/include/linux/mutex.h	2020-11-25 10:06:48.000000000 +0000
@@ -96,7 +96,7 @@
 							\
 	__mutex_init((mutex), #mutex, &__key);		\
 } while (0)
-static inline void mutex_destroy(struct mutex *lock) {}
+static inline void mutex_destroy(struct mutex *lock __attribute__((unused))) {}
 #endif
 
 #ifdef CONFIG_DEBUG_LOCK_ALLOC