/* * tick internal variable and functions used by low/high res code */DECLARE_PER_CPU(struct tick_device, tick_cpu_device);extern spinlock_t tick_device_lock;extern ktime_t tick_next_period;extern ktime_t tick_period; extern void tick_setup_periodic(struct clock_event_device *dev, int broadcast);extern void tick_handle_periodic(struct clock_event_device *dev); /* * NO_HZ / high resolution timer shared code */#ifdef CONFIG_TICK_ONESHOTextern void tick_setup_oneshot(struct clock_event_device *newdev,			       void (*handler)(struct clock_event_device *),			       ktime_t nextevt);extern int tick_program_event(ktime_t expires, int force);extern void tick_oneshot_notify(void);extern int tick_switch_to_oneshot(void (*handler)(struct clock_event_device *));extern void tick_resume_oneshot(void);# ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCASTextern void tick_broadcast_setup_oneshot(struct clock_event_device *bc);extern void tick_broadcast_oneshot_control(unsigned long reason);extern void tick_broadcast_switch_to_oneshot(void);extern void tick_shutdown_broadcast_oneshot(unsigned int *cpup);extern int tick_resume_broadcast_oneshot(struct clock_event_device *bc);# else /* BROADCAST */static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc){	BUG();}static inline void tick_broadcast_oneshot_control(unsigned long reason) { }static inline void tick_broadcast_switch_to_oneshot(void) { }static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { }# endif /* !BROADCAST */ #else /* !ONESHOT */static inlinevoid tick_setup_oneshot(struct clock_event_device *newdev,			void (*handler)(struct clock_event_device *),			ktime_t nextevt){	BUG();}static inline void tick_resume_oneshot(void){	BUG();}static inline int tick_program_event(ktime_t expires, int force){	return 0;}static inline void tick_oneshot_notify(void) { }static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc){	BUG();}static inline void tick_broadcast_oneshot_control(unsigned long reason) { }static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { }static inline int tick_resume_broadcast_oneshot(struct clock_event_device *bc){	return 0;}#endif /* !TICK_ONESHOT */ /* * Broadcasting support */#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCASTextern int tick_do_broadcast(cpumask_t mask); extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu);extern int tick_check_broadcast_device(struct clock_event_device *dev);extern int tick_is_broadcast_device(struct clock_event_device *dev);extern void tick_broadcast_on_off(unsigned long reason, int *oncpu);extern void tick_shutdown_broadcast(unsigned int *cpup);extern void tick_suspend_broadcast(void);extern int tick_resume_broadcast(void); extern voidtick_set_periodic_handler(struct clock_event_device *dev, int broadcast); #else /* !BROADCAST */ static inline int tick_check_broadcast_device(struct clock_event_device *dev){	return 0;} static inline int tick_is_broadcast_device(struct clock_event_device *dev){	return 0;}static inline int tick_device_uses_broadcast(struct clock_event_device *dev,					     int cpu){	return 0;}static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { }static inline void tick_broadcast_on_off(unsigned long reason, int *oncpu) { }static inline void tick_shutdown_broadcast(unsigned int *cpup) { }static inline void tick_suspend_broadcast(void) { }static inline int tick_resume_broadcast(void) { return 0; } /* * Set the periodic handler in non broadcast mode */static inline void tick_set_periodic_handler(struct clock_event_device *dev,					     int broadcast){	dev->event_handler = tick_handle_periodic;}#endif /* !BROADCAST */ /* * Check, if the device is functional or a dummy for broadcast */static inline int tick_device_is_functional(struct clock_event_device *dev){	return !(dev->features & CLOCK_EVT_FEAT_DUMMY);}