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<linux/netdev.h>, so I can't really add someprintk()there. I've been following the book, but as you said, it's quite old and must of the stuff is obsolete.net/core/dev.c. Yes, the book is old, but there are several repositories on Github that are trying to keep the sample source code from the book up to date. For example: github.com/martinezjavier/ldd3.