pmap_fault
rv = pmap_fault(map, va, ftype);
int pmap_fault(struct vm_map *, vaddr_t, vm_prot_t);
int pmap_fault(struct vm_map *, vaddr_t, vm_prot_t);
bool pmap_fault(pmap_t pmap, vaddr_t va, vm_prot_t *atype);
if (pmap_fault(vm_map->pmap, va, &atype)) {
extern bool pmap_fault(pmap_t pmap, vaddr_t va, vm_prot_t *atype);