linux-3.0.35 Kernel Source directory structure

1	Arch	Contains code related to hardware architecture, each of which occupies a corresponding directory, such as ARM, x86, MIPS
2	Block	Block device driver I/O scheduling
3	Crypto	Commonly used encryption and hashing algorithms, such as SHA1, AES, and some compression and CRC check algorithms, such as CRC32
4	Documentation	General explanations and annotations for each part of the kernel
5	Drivers	Device drivers, each of which consumes a subdirectory, such as SPI, etc.
6	Firmware	Device firmware program provided by hardware vendor
7	Fs	Support for various file systems, such as EXT3, NFS
8	Include	header files, system-related header files are placed in the Include/linux subdirectory
9	Init	Kernel initialization code
10	Ipc	Inter-process communication code, such as shared memory, Message Queuing
11	Kernel	The core of the kernel, including process scheduling, timers, etc., while the rest of the platform-related code is placed in the Arch/*/kernel directory
12	Lib	Library File Code
13	Mm	Memory management code, and part of the platform-related code is placed under ARCH/*/MM
14	Net	Network-related code that implements a variety of common style protocols
15	Patches	Patch files for the kernel
16	Samples	Some simple kernel programming sample programs
17	Scripts	script files for configuring the kernel
18	Security	SELinux module
19	Sound	Audio-driven core code
20	Tools	Test code for some peripherals, such as TESTUSB.C
21st	Usr	Implementation of CPIO for packaging and compression, etc.
22	Virt	Kernel virtual machine

linux-3.0.35 Kernel Source directory structure