mte_mk_root
rcu_assign_pointer(mas->tree->ma_root, mte_mk_root(mas->node));
rcu_assign_pointer(mas->tree->ma_root, mte_mk_root(mas->node));
rcu_assign_pointer(mas->tree->ma_root, mte_mk_root(mas->node));
root = mte_mk_root(root);