PIC_IRQBASE_ALLOC
pi->pi_irqbase = pic_add(&pi->pi_pic, PIC_IRQBASE_ALLOC);
pic_add(pic, PIC_IRQBASE_ALLOC);
pic_add(pic, PIC_IRQBASE_ALLOC);
bcm2835_int_base = pic_add(&bcm2835_pic, PIC_IRQBASE_ALLOC);
if (gpio->gpio_irqbase == PIC_IRQBASE_ALLOC || gpio->gpio_irqbase > 0) {
sc->gpio_irqbase = PIC_IRQBASE_ALLOC;
if (irqbase == PIC_IRQBASE_ALLOC) {