--- zzzz-none-000/linux-4.1.52/include/linux/rcutiny.h	2018-05-28 02:26:45.000000000 +0000
+++ bcm63-7530ax-731/linux-4.1.52/include/linux/rcutiny.h	2022-03-02 11:37:13.000000000 +0000
@@ -87,7 +87,7 @@
  * Take advantage of the fact that there is only one CPU, which
  * allows us to ignore virtualization-based context switches.
  */
-static inline void rcu_virt_note_context_switch(int cpu)
+static inline void rcu_virt_note_context_switch(int cpu __attribute__((unused)))
 {
 }