The kernel source tree is divided into a number of directories, most of which contain many more subdirectories.The directories in the root of the source tree, along with their descriptions.
Directory Description
arch Architecture-specific source
block Block I/O layer
crypto Crypto API
Documentation Kernel source documentation
drivers Device drivers
firmware Device firmware needed to use
certain drivers
fs The VFS and the individual filesystems
include Kernel headers
init Kernel boot and initialization
ipc Interprocess communication code
kernel Core subsystems, such as the scheduler
lib Helper routines
mm Memory management subsystem and
the VM
net Networking subsystem
samples Sample, demonstrative code
scripts Scripts used to build the kernel
security Linux Security Module
sound Sound subsystem
usr Early user-space code (called initramfs)
tools Tools helpful for developing Linux
virt Virtualization infrastructure
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