APIC_IR_BITS
#define APIC_IR_MAPSIZE (APIC_IR_BITS / BITS_PER_LONG)
if (bitmap_empty(isr->map, APIC_IR_BITS))
for_each_set_bit(bit, isr->map, APIC_IR_BITS)
return bitmap_empty(isr->map, APIC_IR_BITS);
if (!bitmap_empty(ir.map, APIC_IR_BITS))