ldd3: Linux Device Drivers 3 examples updated to work with recent kernels

Linux Device Drivers 3 (http://lwn.net/Kernel/LDD3/) book is now a few years old and most of the example drivers do not compile in recent kernels.

This project aims to keep LDD3 example drivers up-to-date with recent kernels.

The original code can be found at: http://examples.oreilly.com/9780596005900/

The example drivers should compile against latest Linus Torvalds kernel tree:

• git://git.kernel.org/pub/scm/linux/kernel/git/sfr/linux-next.git

To compile the drivers against a specific tree (for example Linus tree):

$ git clone git://github.com/martinezjavier/ldd3.git
$ git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
$ export KERNELDIR=/path/to/linux
$ cd ldd3
$ make

Bugs, comments or patches: See https://github.com/martinezjavier/ldd3/issues

The kernel builds below are the versions most recently tested/supported

• Ubuntu 18.04 kernel as of July 2020: 5.4.0-42-generic
• Ubuntu 20.04 kernel as of July 2021: 5.4.0-73-generic
• Yocto poky warrior branch kernel for qemu aarch64 builds: 5.0.19
• Yocto poky hardknott branch kernel for qemu aarch64 builds: 5.10.46
• Buildroot 2019.05 kernel for qemu builds: 4.9.16
• Buildroot 2021.02 kernel for qemu builds: 5.10
• Alpine 3.13 kernel as of May 2021: 5.10.29-lts, see here for detail.

---------4 Eclipse CDT integration is provided by symlinking the correct linux source directory with the ./linux_source_cdt symlink. The .project and .cproject files were setup using instructions in this link and assuming a symlink is setup in the local project directory to point to relevant kernel headers

This can be done on a system with kernel headers installed using:

ln -s /usr/src/linux-headers-`uname -r`/ linux_source_cdt