diff --git a/[refs] b/[refs]
index ea48a20d9bf2..972dc07240b1 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: bb3bf7052de520f2d21a1275e95fac7a84d89e4c
+refs/heads/master: c4f3060843506ba6d473ab9a0afe5bd5dc93a00d
diff --git a/trunk/include/linux/sched.h b/trunk/include/linux/sched.h
index 1c4f3e9b9bc5..4a7e4d333a27 100644
--- a/trunk/include/linux/sched.h
+++ b/trunk/include/linux/sched.h
@@ -2070,6 +2070,14 @@ extern int sched_setscheduler(struct task_struct *, int,
 extern int sched_setscheduler_nocheck(struct task_struct *, int,
 				      const struct sched_param *);
 extern struct task_struct *idle_task(int cpu);
+/**
+ * is_idle_task - is the specified task an idle task?
+ * @tsk: the task in question.
+ */
+static inline bool is_idle_task(struct task_struct *p)
+{
+	return p->pid == 0;
+}
 extern struct task_struct *curr_task(int cpu);
 extern void set_curr_task(int cpu, struct task_struct *p);