jhash
hlist_for_each_entry_rcu(o, &n[jhash(&k, sizeof(k), 0) >> (32 - ilog2(ARRAY_SIZE(n)))],\
hlist_for_each_entry(o, &n[jhash(&k, sizeof(k), 0) >> (32 - ilog2(ARRAY_SIZE(n)))],\
hlist_add_head_rcu(n, &h[jhash(&k, sizeof(k), 0) >> (32 - ilog2(ARRAY_SIZE(h)))])
hlist_add_head(n, &h[jhash(&k, sizeof(k), 0) >> (32 - ilog2(ARRAY_SIZE(h)))])