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Linux Kernel Programming

Linux Kernel Programming

By : Kaiwan N. Billimoria
4.9 (35)
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Linux Kernel Programming

Linux Kernel Programming

4.9 (35)
By: Kaiwan N. Billimoria

Overview of this book

The 2nd Edition of Linux Kernel Programming is an updated, comprehensive guide for new programmers to the Linux kernel. This book uses the recent 6.1 Long-Term Support (LTS) Linux kernel series, which will be maintained until Dec 2026, and also delves into its many new features. Further, the Civil Infrastructure Project has pledged to maintain and support this 6.1 Super LTS (SLTS) kernel right until August 2033, keeping this book valid for years to come! You’ll begin this exciting journey by learning how to build the kernel from source. In a step by step manner, you will then learn how to write your first kernel module by leveraging the kernel’s powerful Loadable Kernel Module (LKM) framework. With this foundation, you will delve into key kernel internals topics including Linux kernel architecture, memory management, and CPU (task) scheduling. You’ll finish with understanding the deep issues of concurrency, and gain insight into how they can be addressed with various synchronization/locking technologies (e.g., mutexes, spinlocks, atomic/refcount operators, rw-spinlocks and even lock-free technologies such as per-CPU and RCU). By the end of this book, you’ll have a much better understanding of the fundamentals of writing the Linux kernel and kernel module code that can straight away be used in real-world projects and products.
Table of Contents (16 chapters)
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14
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15
Index

Summary

This chapter, along with the previous one, covered in a lot of detail the necessary preliminaries and how exactly to configure and build the Linux kernel from source.

In this chapter, we began with the actual kernel (and kernel modules’) build process. Once built, we showed how the kernel modules are to be installed onto the system. We then moved on to the practicalities of generating the initramfs (or initrd) image and went on to explain the motivation behind it.

The final step in the kernel build was the (simple) customization of the bootloader (here, we focused only on x86 GRUB). We then showed how to boot the system via the newly baked kernel and verify that its configuration is as we expected. As a useful add-on, we then showed how we can even cross-compile the Linux kernel for another processor (AArch64, in this instance). Finally, we shared some additional tips to help you with the kernel build.

Again, if you haven’t done so already, we urge...

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