IPV6_PMTUDISC_DO
return pmtudisc < IPV6_PMTUDISC_DO ||
harderr = (READ_ONCE(np->pmtudisc) == IPV6_PMTUDISC_DO);
val = IPV6_PMTUDISC_DO;
val = IPV6_PMTUDISC_DO;
val = IPV6_PMTUDISC_DO;