On Thu, 12 Aug 2021 11:45:45 +0200, "Fabio M. De Francesco" said:

I've heard that your book, LDD 3rd edition, has become obsolete a long time ago and most sample code cannot anymore build. Reading what you wrote above seems to contradict what I've been told by others... I must admit that I've just had a print copy of it that I have not yet opened for reading, therefore maybe that I'm totally wrong in assuming the above.

The APIs have all changed a lot since the 3rd edition. The concepts haven't changed that much. And given that the in-kernel APIs have *always* been a moving target, being able to deal with the fact that a given function now takes a 'struct foo*' rather than a 'struct bar *' is a very necessary skill for anybody who's planning to do serious kernel work.