Symbol: NETLINK_F_EXT_ACK
net/netlink/af_netlink.c
1705
nr = NETLINK_F_EXT_ACK;
net/netlink/af_netlink.c
1772
flag = NETLINK_F_EXT_ACK;
net/netlink/af_netlink.c
2162
if (!extack || !test_bit(NETLINK_F_EXT_ACK, &nlk->flags))