说明：  很多Linux 爱好者对内核很感兴趣却无从下手，本文旨在介绍一种解读Linux内核源码的入门方法，而不是讲解Linux复杂的内核机制。
(Many Linux enthusiasts are very interested in the kernel where to start, this article aims to introduce a Linux kernel source code read the entry, rather than on the Linux kernel complex mechanism.)