![Creating the patch
$ git reset --hard HEAD
[work...]
$ git diff
[review work...]
$ git commit -as
$ git format-patch -1
… and then the hardest part](https://image.slidesharecdn.com/lww-new-180813132927/85/Linux-Kernel-Let-s-Contribute-22-320.jpg)
Linux Kernel - Let's Contribute!
- 1. Let's contribute! Levente Kurusa Presented by Fedora Project Hungary <[email protected]> Licensed under CC-BY-SA Linux Kernel
- 2. Topics 1. Quick introduction 2. Random configurations 3. Kernel testing a. Stable kernels b. RC kernels 4. Checkpatch patches
- 4. Linux powers the world! Servers! The cloud! Desktop? Maybe this year? Open source contribution is always a big plus when it comes to job search! Linux is cool! Why not? Why?
- 5. 86% say Linux advanced their career 93% of HR will recruit a Linux pro next year 75% already received a call this year! Interesting projects! Greater pay check! (+10% this year) Some statistics
- 6. First steps Fetch the Linux kernel source code For random configurations: linux-next http://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git For stable testing: linux-stable http://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git For Rcs, simply clone down Linus' tree http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
- 7. Eudyptula Challenge http://eudyptula-challenge.org/ Series of programming tasks Hard, but fun!
- 8. Linux-next The current state of the kernel Merged together by Stephen Rothwell An excellent opportunity to start Default configurations are tested
- 9. Linux-stable Collection of important patches to old kernel release Backports needed! Maintained by Greg KH and others Documentation/stable_kernel_rules.txt
- 11. Randomized configurations of the kernel Often have a lot of problems GCC warnings GCC errors kconfig errors/warnings They sometimes don't even boot Extremely useful! What are randconfigs?
- 12. $ make randconfig Completely nonsense config! Try to build it: $ make -j`nproc` Your first randconfig
- 13. Possible errors Undeclared functions Kconfig circular dependencies Boot failure Test in emulator!
- 14. Kernel testing
- 15. Run the latest kernel Quite easy! $ make defconfig $ make localmodconfig $ make -j`nproc` # make headers_install # make install # reboot
- 16. Actual testing If you test linux-stable ... and things break: Report it! ... if nothing breaks: Break it! (repeat) If you test linux-next ... it's risky to try on your computer
- 17. Actual testing I use my own tiny project. LATTE – Linux Automatic Testing Tool for Expert (https://github.com/levex/latte) Emulators are great. Benchmarks are also fun. perf
- 18. perf # perf list # perf record <command> # perf report # perf stat -e <event>
- 19. Sending your first patch ● Also known as: Checkpatch patches
- 20. Checkpatch? scripts/checkpatch.pl Checks for common errors in the patch ... and files with the --file switch Not just coding style, but bugs as well!
- 21. Getting maintainers scripts/get_maintainer.pl Gives you a list of maintainers for that particular patch or file ... or you can manually browse through the MAINTAINERS file
- 22. Creating the patch $ git reset --hard HEAD [work...] $ git diff [review work...] $ git commit -as $ git format-patch -1 … and then the hardest part
- 23. Sending it 9 out of 10 will fail this step git send-email Thunderbird and such can do it as well, but it's hard to configure them properly.
- 24. People on LKML are grumpy! Don't be afraid to ask RTFM Summary
- 25. Any questions? Licensed under CC-BY-SA <[email protected]> @ilevex Contact: