The progress of Linux device driver development (version 3rd) is updated at the same time.

This blog updates the latest developments in Linux device driver development (version 3rd) in real time.

At present, Chapter 4-9 has been initially completed on April 30, 2nd. Compared with version, these chapters are mainly changed.

[F] indicates correction or upgrade; [N] indicates new knowledge points; [D] indicates deleted content.

Chapter 4 Linux kernel module
[F] Correct the non-GPL license used by the module;
[F] modify the memory management of the _ exit modifier Function

Chapter 4 Linux File System and Device Files
[F] modify the driver relationship between the file system and the block device;
[N] added the file operation call diagram from the application to the driver;
[N] added an example of accepting kernel uevent through netlink;
[N] example of adding sysfs traversal;
[N] added an example for writing udev rules for the kingston USB disk;
[F] update udev rules to comply with the new version;
[N] added udevadm instructions;
[N] highlight Android vold
 
Chapter 2 character Device Driver
[F] update the definition of file_operations and upgrade the ioctl () prototype;
[N] added explanations about Linux access_ OK () and Linux kernel security vulnerabilities;
[F] corrected the globalmem encoding style;
[F] When globalmem supports more than two instances, it is upgraded from directly two instances to support N instances;

Chapter 2 Concurrency Control in Linux Device Drivers
[N] drawing provides an in-depth description of competing states in Single-core and multi-core environments;
[N] added explanations on compilation disorder, execution disorder, compilation barrier, and memory barrier;
[N] added instructions on arm ldrex/STREX commands;
[N] in-depth analysis of single-core and multi-core use cases of the spin_lock;
[F] reorganize the RCU explanation methods and examples;
[F] indicates that the semaphore has expired;
[F] Replace the semaphore used in globalmem with mutex;

Chapter 2 blocking and non-blocking I/O in Linux Device Drivers
[N] Add a sequence chart for blocking and non-group congestion;
[F] corrected the globalfifo encoding style;
[F] modify the readable and writable if value of globalfifo to while value;
[N] The sequence chart of the new select statement;
[N] add EPOLL chapter;

Chapter 2 asynchronous notifications and asynchronous I/O in Linux Device Drivers
[F] fixed glibc AIO support;
[F] modify kernel AIO support;
[F] AIO interface for driver correction;
[D] deleting error instances supported by AIO driver;
[N] highlighting C10K issues;