register_offsets
cb->register_offsets = kzalloc_objs(int, max);
if (!cb->register_offsets)
cb->register_offsets[i] = reserved;
kfree(cb->register_offsets);
int *register_offsets;
writel(cb_no, cb->crossbar_base + cb->register_offsets[irq_no]);
writew(cb_no, cb->crossbar_base + cb->register_offsets[irq_no]);
writeb(cb_no, cb->crossbar_base + cb->register_offsets[irq_no]);