IPSET_GC_PERIOD
map->gc.expires = jiffies + IPSET_GC_PERIOD(set->timeout) * HZ;
mod_timer(&map->gc, jiffies + IPSET_GC_PERIOD(set->timeout) * HZ);
next_run = (IPSET_GC_PERIOD(set->timeout) * HZ) / numof_locks;
map->gc.expires = jiffies + IPSET_GC_PERIOD(set->timeout) * HZ;
mod_timer(&map->gc, jiffies + IPSET_GC_PERIOD(set->timeout) * HZ);