#ifndef _LINUX_IRQNR_H
  #define _LINUX_IRQNR_H

  /*
   * Generic irq_desc iterators:
   */
  #ifdef __KERNEL__

  #ifndef CONFIG_GENERIC_HARDIRQS
  #include <asm/irq.h>

  
  /*
   * Wrappers for non-genirq architectures:
   */
  #define nr_irqs			NR_IRQS
  #define irq_to_desc(irq)	(&irq_desc[irq])

  
  # define for_each_irq_desc(irq, desc)		\
  	for (irq = 0; irq < nr_irqs; irq++)

  # define for_each_irq_desc_reverse(irq, desc)                          \
  	for (irq = nr_irqs - 1; irq >= 0; irq--)

  #else /* CONFIG_GENERIC_HARDIRQS */

  
  extern int nr_irqs;

  extern struct irq_desc *irq_to_desc(unsigned int irq);

  # define for_each_irq_desc(irq, desc)					\
  	for (irq = 0, desc = irq_to_desc(irq); irq < nr_irqs;		\

  	     irq++, desc = irq_to_desc(irq))				\

  		if (!desc)						\
  			;						\
  		else

  # define for_each_irq_desc_reverse(irq, desc)				\
  	for (irq = nr_irqs - 1, desc = irq_to_desc(irq); irq >= 0;	\

  	     irq--, desc = irq_to_desc(irq))				\

  		if (!desc)						\
  			;						\
  		else

  #ifdef CONFIG_SMP
  #define irq_node(irq)	(irq_to_desc(irq)->node)
  #else
  #define irq_node(irq)	0
  #endif

  #endif /* CONFIG_GENERIC_HARDIRQS */

  
  #define for_each_irq_nr(irq)                   \
         for (irq = 0; irq < nr_irqs; irq++)

  #endif /* __KERNEL__ */

  #endif