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Anyway, don't just read the book pasively, but download the kernel, search the examples, study them with the book besides you. Don't expect to understand everything by the first look.

The book is based on kernel 2.2.x, with a paragraph at the end of every chapter explaining the changes in 2.4.x. I appreciate the book doesn't claim to cover the 2.4.x kernel, as some others do (just to find out, after buying them, that it's not true).

jaume