On Robert's Love Linux kernel development 3rd edtion

[TD]

Hi,
I'm trying to lean linux kernel dev.
I bought Robert's love book : "Linux Kernel develpment"

This book is based on the linux version 2.6.
I can see  in the kernel.org site that the latest stable version of ther
kernel is 3.9.9.

So my question is : what is the most efficient way to learn from this book
 ?
1) Download the 2.6 version and follow the examples and explanations based
from this version
2) Download the 3.9.9 version and try to adapt the examples and
explanations of the book.
3) Download both so that I can see the differences.

Any other idea or suggestion is very welcomed.

Cheers,
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