SKB_DROP_REASON_SUBSYS_CORE
list = rcu_dereference(drop_reasons_by_subsys[SKB_DROP_REASON_SUBSYS_CORE]);
[SKB_DROP_REASON_SUBSYS_CORE] = RCU_INITIALIZER(&drop_reasons_core),
if (WARN(subsys <= SKB_DROP_REASON_SUBSYS_CORE ||
if (WARN(subsys <= SKB_DROP_REASON_SUBSYS_CORE ||