mp_map_gsi_to_irq
extern int mp_map_gsi_to_irq(u32 gsi, unsigned int flags,
irq = mp_map_gsi_to_irq(gsi, IOAPIC_MAP_ALLOC, &info);
irq = mp_map_gsi_to_irq(gsi, 0, NULL);
int irq = mp_map_gsi_to_irq(gsi, 0, NULL);
ret = mp_map_gsi_to_irq(gsi, IOAPIC_MAP_ALLOC, &info);
irq = mp_map_gsi_to_irq(gsi, IOAPIC_MAP_ALLOC, &info);