_pmap_pte_adjust_prot
pte = _pmap_pte_adjust_prot(pte, prot & pteprot, mdattr, user);
pte = _pmap_pte_adjust_prot(pte, prot, mdattr, user);
static pt_entry_t _pmap_pte_adjust_prot(pt_entry_t, vm_prot_t, vm_prot_t, bool);
attr = _pmap_pte_adjust_prot(attr, prot, mdattr, user);
attr = _pmap_pte_adjust_prot(0, prot, VM_PROT_ALL, false);