+
+/*
+ * Call this pair of function if the arch doesn't make any use
+ * of RCU in-between. You won't need to call rcu_idle_enter() and
+ * rcu_idle_exit().
+ * Otherwise you need to call tick_nohz_idle_enter() and tick_nohz_idle_exit()
+ * and explicitly tell RCU about the window around the place the CPU enters low
+ * power mode where no RCU use is made. This is done by calling rcu_idle_enter()
+ * after the last use of RCU before the CPU is put to sleep and by calling
+ * rcu_idle_exit() before the first use of RCU after the CPU woke up.
+ */
+static inline void tick_nohz_idle_enter_norcu(void)
+{
+ /*
+ * Also call rcu_idle_enter() in the irq disabled section even
+ * if it disables irq itself.
+ * Just an optimization that prevents from an interrupt happening
+ * between it and __tick_nohz_idle_enter() to lose time to help
+ * completing a grace period while we could be in extended grace
+ * period already.
+ */
+ local_irq_disable();
+ __tick_nohz_idle_enter();
+ rcu_idle_enter();
+ local_irq_enable();
+}
+static inline void tick_nohz_idle_exit_norcu(void)
+{
+ rcu_idle_exit();
+ tick_nohz_idle_exit();
+}