tcp_sock_set_keepidle_locked
int tcp_sock_set_keepidle_locked(struct sock *sk, int val);
err = tcp_sock_set_keepidle_locked(sk, val);
err = tcp_sock_set_keepidle_locked(sk, val);
tcp_sock_set_keepidle_locked(ssk, msk->keepalive_idle);
&tcp_sock_set_keepidle_locked,