irq_create_affinity_masks
desc = irq_create_affinity_masks(nvec, affd);
irq_create_affinity_masks(1, affd);
affd ? irq_create_affinity_masks(nvec, affd) : NULL;
affd ? irq_create_affinity_masks(nvec, affd) : NULL;
irq_create_affinity_masks(unsigned int nvec, struct irq_affinity *affd);