Linux kernel is changing fast in bits and pieces. I feel most of the books published at least a year ago will be partly out of sync with the latest kernel source code. Personally, I suggest two books which I find most helpful:

[1] Understanding the Linux Kernel, 3rd Edition
[2] Essential Linux Device Drivers
[3] Linux Kernel Development, 3rd Edition

Also, Linux Cross Reference helps in tracking kernel sources across most of the kernel versions.