pmap_is_valid_memattr
if (!pmap_is_valid_memattr(pmap, mode))
!pmap_is_valid_memattr(map->pmap, pbm->pbm_memattr))
if (!pmap_is_valid_memattr(pmap, mode))
KASSERT(pmap_is_valid_memattr(kernel_pmap, mode),
bool pmap_is_valid_memattr(pmap_t, vm_memattr_t);