The Linux Kernel Module Programming Guide is an educational resource that teaches how to write, compile, and manage loadable kernel modules for modern Linux kernels. It covers the complete lifecycle of kernel modules, from building and loading to unloading and debugging, with a focus on extending kernel functionality without recompiling the entire kernel.
The guide provides comprehensive coverage of core kernel programming concepts including dynamic module loading, file-operation registration, interrupt handling, kernel-user data copying, concurrency control, and deferred task scheduling. It also addresses device driver development patterns for PCI, USB, and character devices, along with memory management, synchronization mechanisms such as mutexes, spinlocks, and read-write locks, and timing operations using timers and workqueues.
The material includes practical techniques for kernel debugging and testing, virtual filesystem exports through procfs, sysfs, and debugfs, and safe memory allocation and data transfer between user and kernel address spaces. The guide is designed for Linux 5.0+ kernels and includes instructions for testing modules in a virtual machine environment.