The job of a linux kernel programmer is to write efficient programs to solve low level operating system problems. Some of these are Linux basic programming books, whereas other books focus on a some of the advanced topics in Linux kernel programming.
Most of the software professionals have a fair idea of Linux i.e. what is it and what are the main uses; however, when it comes to Linux programming, even experienced programmers have a fairly low expertise in this field. Linux is among one of the most popular operating systems used throughout the world and it offers several benefits over other traditional operating systems. In addition to it, Windows offer comparatively poor command-line support making it difficult to do system programming. Further, a professional willing to jump into system programming would require an excellent knowledge of Linux because it is the most preferred server operating system.
On top of everything else, Linux is the best operating system that allows you to study the working principles of an operating system. If you are planning to get into Linux programming, you can start with these books and improve your Linux skills.