sock_bh_locked
static DEFINE_PER_CPU(struct sock_bh_locked, ipv4_tcp_sk) = {
static DEFINE_PER_CPU(struct sock_bh_locked, nat_keepalive_sk_ipv4) = {
static DEFINE_PER_CPU(struct sock_bh_locked, nat_keepalive_sk_ipv6) = {
static int nat_keepalive_sk_init(struct sock_bh_locked __percpu *socks,
static void nat_keepalive_sk_fini(struct sock_bh_locked __percpu *socks)