linux-stable-rt/include/linux/irqnr.h

#ifndef _LINUX_IRQNR_H
#define _LINUX_IRQNR_H

#ifndef CONFIG_GENERIC_HARDIRQS
#include <asm/irq.h>
# define nr_irqs		NR_IRQS

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

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

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

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

#endif