+ * @cpus: the cpus to run the @fn() on (NULL = any online cpu)
+ *
+ * Description: This is a special version of the above, which assumes cpus
+ * won't come or go while it's being called. Used by hotplug cpu.
+ */
+int __stop_machine(int (*fn)(void *), void *data, const struct cpumask *cpus);
+
+/**
+ * stop_machine_create: create all stop_machine threads