https://blog.wongcw.com/2020/10/28/linux-kernel%e5%8d%b3%e5%b0%87%e5%81%9c%e6%ad%a2%e5%b0%8dwimax-802-12%e6%a8%99%e6%ba%96%e7%9a%84%e6%94%af%e6%8c%81/