XXXX pass in cpu_pause_func via pause_cpus

@@ -277,11 +277,11 @@
          * Pause all working CPUs, which ensures that there's no CPU in
          * function xc_common().
          * This is used to work around a race condition window in xc_common()
          * between checking CPU_READY flag and increasing working item count.
          */
-        pause_cpus(cpup);
+        pause_cpus(cpup, NULL);
         start_cpus();
 
         for (i = 0; i < XC_FLUSH_MAX_WAITS; i++) {
                 if (cpup->cpu_m.xc_work_cnt == 0) {
                         break;