#define rcu_bh_qsctr_inc(cpu)
#define call_rcu_bh(head, rcu) call_rcu(head, rcu)
-extern void __rcu_read_lock(void);
-extern void __rcu_read_unlock(void);
+extern void __rcu_read_lock(void) __acquires(RCU);
+extern void __rcu_read_unlock(void) __releases(RCU);
extern int rcu_pending(int cpu);
extern int rcu_needs_cpu(int cpu);
struct softirq_action;
+#ifdef CONFIG_NO_HZ
+DECLARE_PER_CPU(long, dynticks_progress_counter);
+
+static inline void rcu_enter_nohz(void)
+{
+ smp_mb(); /* CPUs seeing ++ must see prior RCU read-side crit sects */
+ __get_cpu_var(dynticks_progress_counter)++;
+ WARN_ON(__get_cpu_var(dynticks_progress_counter) & 0x1);
+}
+
+static inline void rcu_exit_nohz(void)
+{
+ __get_cpu_var(dynticks_progress_counter)++;
+ smp_mb(); /* CPUs seeing ++ must see later RCU read-side crit sects */
+ WARN_ON(!(__get_cpu_var(dynticks_progress_counter) & 0x1));
+}
+
+#else /* CONFIG_NO_HZ */
+#define rcu_enter_nohz() do { } while (0)
+#define rcu_exit_nohz() do { } while (0)
+#endif /* CONFIG_NO_HZ */
+
#endif /* __KERNEL__ */
#endif /* __LINUX_RCUPREEMPT_H */