AF_NVR_VALID
set_bit(AF_NVR_VALID, &a->flags);
clear_bit(AF_NVR_VALID, &a->flags);
set_bit(AF_NVR_VALID, &a->flags);
clear_bit(AF_NVR_VALID, &a->flags);
if (!test_bit(AF_NVR_VALID, &a->flags)) {
if (!test_bit(AF_NVR_VALID, &a->flags))