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