#ifndef _LINUX_IRQHANDLER_H
  #define _LINUX_IRQHANDLER_H
  
  /*
   * Interrupt flow handler typedefs are defined here to avoid circular
   * include dependencies.
   */
  
  struct irq_desc;
  struct irq_data;
  typedef	void (*irq_flow_handler_t)(struct irq_desc *desc);
  typedef	void (*irq_preflow_handler_t)(struct irq_data *data);
  
  #endif