XXXX pass in cpu_pause_func via pause_cpus

@@ -218,11 +218,11 @@
 
 static void
 mpo_wr_lock()
 {
         mutex_enter(&cpu_lock);
-        pause_cpus(NULL);
+        pause_cpus(NULL, NULL);
         mutex_exit(&cpu_lock);
 }
 
 static void
 mpo_wr_unlock()