UVM_LOAN_TOANON
if (flags & UVM_LOAN_TOANON) {
KASSERT(((flags & UVM_LOAN_TOANON) == 0) ^
if (flags & UVM_LOAN_TOANON) {
if (flags & UVM_LOAN_TOANON) {
if ((flags & UVM_LOAN_TOANON) == 0) {
if ((flags & UVM_LOAN_TOANON) == 0) { /* loaning to kernel-page */