ixp2000_reg_write(board_irq_mask, dummy);
ixp2000_reg_wrb(board_irq_mask, dummy);
static void ixdp2x00_irq_unmask(unsigned int irq){	unsigned long dummy;	static struct slowport_cfg old_cfg;#ifdef CONFIG_ARCH_IXDP2400	if (machine_is_ixdp2400())		ixp2000_acquire_slowport(&slowport_cpld_cfg, &old_cfg);#endif	dummy = *board_irq_mask;	dummy &=  ~IXP2000_BOARD_IRQ_MASK(irq);	ixp2000_reg_write(board_irq_mask, dummy);	if (machine_is_ixdp2400()) 		ixp2000_release_slowport(&old_cfg);}