Writing our very first kernel module

When introducing a new programming language or topic, it has become a widely accepted computer programming tradition to mimic the original Hello, world program as the very first piece of code. I’m happy to follow this venerated tradition to introduce the Linux kernel’s powerful LKM framework. In this section, you will learn the steps to code a simple LKM. We explain the code in detail.

Introducing our Hello, world LKM C code

Without further ado, here is some simple Hello, world C code, implemented to abide by the Linux kernel’s LKM framework:

For reasons of readability and space constraints, only the key parts of most source code are displayed here. To view the complete source code (with all comments), build it, and run it, the entire source tree for this book is available in its GitHub repository here: https://github.com/PacktPublishing/Linux-Kernel-Programming_2E. We definitely expect you to clone it and...