Invaluable

If you have to write a linux kernel module, this book is a lifesaver. The source-code for the samples is available online and saved me a ton of time getting the basics of a device file / ioctls / etc going so I could communicate with my module and focus on value add instead of boilerplate.

Other Reviews

• Highly Overrated, but the only text on the market.
• hands on way to learn LDD
• Invaluable
• A good balance of "How" and "Why"