+ /*
+ * Take direct locks as lock_policy_rwsem_write wouldn't work here.
+ * Also lock for last cpu is enough here as contention will happen only
+ * after policy->cpu is changed and after it is changed, other threads
+ * will try to acquire lock for new cpu. And policy is already updated
+ * by then.
+ */
+ down_write(&per_cpu(cpu_policy_rwsem, policy->cpu));
+