#ifndef LINUX_HARDIRQ_H
  #define LINUX_HARDIRQ_H

  #include <linux/preempt.h>

  #include <linux/lockdep.h>

  #include <linux/ftrace_irq.h>

  #include <linux/vtime.h>

  #include <asm/hardirq.h>

  extern void synchronize_irq(unsigned int irq);

  extern bool synchronize_hardirq(unsigned int irq);

  #if defined(CONFIG_TINY_RCU)

  
  static inline void rcu_nmi_enter(void)
  {
  }
  
  static inline void rcu_nmi_exit(void)
  {
  }
  
  #else

  extern void rcu_nmi_enter(void);
  extern void rcu_nmi_exit(void);

  #endif

  /*
   * It is safe to do non-atomic ops on ->hardirq_context,
   * because NMI handlers may not preempt and the ops are
   * always balanced, so the interrupted value of ->hardirq_context
   * will always be restored.
   */

  #define __irq_enter()					\
  	do {						\

  		account_irq_enter_time(current);	\

  		preempt_count_add(HARDIRQ_OFFSET);	\

  		trace_hardirq_enter();			\
  	} while (0)
  
  /*
   * Enter irq context (on NO_HZ, update jiffies):
   */

  extern void irq_enter(void);

  
  /*
   * Exit irq context without processing softirqs:
   */
  #define __irq_exit()					\
  	do {						\
  		trace_hardirq_exit();			\

  		account_irq_exit_time(current);		\

  		preempt_count_sub(HARDIRQ_OFFSET);	\

  	} while (0)

  /*
   * Exit irq context and process softirqs if needed:
   */

  extern void irq_exit(void);

  #define nmi_enter()						\
  	do {							\

  		lockdep_off();					\

  		ftrace_nmi_enter();				\
  		BUG_ON(in_nmi());				\

  		preempt_count_add(NMI_OFFSET + HARDIRQ_OFFSET);	\

  		rcu_nmi_enter();				\
  		trace_hardirq_enter();				\

  	} while (0)

  #define nmi_exit()						\
  	do {							\
  		trace_hardirq_exit();				\
  		rcu_nmi_exit();					\

  		BUG_ON(!in_nmi());				\

  		preempt_count_sub(NMI_OFFSET + HARDIRQ_OFFSET);	\

  		ftrace_nmi_exit();				\

  		lockdep_on();					\

  	} while (0)

  #endif /* LINUX_HARDIRQ_H */