is the ultimate authority, several community-maintained GitHub repositories provide structured guides, full book source code, and PDF downloads to help developers master the subject. Essential GitHub Resources and PDF Guides
: While not officially an "open" book like , many community members host the Linux Kernel Development PDF in educational repositories . linux kernel programming pdf github full
While not always a direct PDF download, this repository is a legendary deep dive into the internals of the kernel. It covers initialization, interrupts, system calls, and memory management in great detail. is the ultimate authority