bit_ffs_at
bit_ffs_at(softc->vlan_tags, bit_pos, 4096, &vlan_tag);
bit_ffs_at(t->stid_bitmap, val, t->nstids, &val);
bit_ffs_at(evdev->ev_key_flags, KEY_OK, KEY_CNT - KEY_OK, &res);
bit_ffs_at((bitstr_t *)(data), (bit) + 1, (nbits), &(bit)))
bit_ffs_at(vsi->vlans_map, i, IXL_VLANS_MAP_LEN, &vlan);
bit_ffs_at(&ub->map[0],
BITSTRING_TC_DEFINE(bit_ffs_at)
bit_ffs_at(bitstr, i, nbits, &found_set_bit);
bit_ffs_at(bitstr, i, nbits, &found_set_bit);
bit_ffs_at(bitstr, i, nbits, &found_set_bit);
bit_ffs_at(bitstr, i, nbits, &found_set_bit);
bit_ffs_at(bitstr, nbits, nbits, &found_set_bit);
bit_ffs_at(bitstr, nbits + 3, nbits, &found_set_bit);
bit_ffs_at(bitstr, i, nbits, &found_set_bit);
BITSTRING_TC_ADD(tp, bit_ffs_at);
bit_ffs_at(spacemap, srunb, zfs->spacemapbits, &srunb);
bit_ffs_at(array, start, stop + 1, &res);