- #Kernel linux how to#
- #Kernel linux install#
- #Kernel linux driver#
- #Kernel linux Patch#
- #Kernel linux code#
Naturally, after a while of improving the code quality it is good to move on and seek different kinds of assignments. Konrad in linux-mainline (jsm-work) % make C=1 M=drivers/staging/dgapĭrivers/staging/dgap/dgap.c:365:25: warning: too long initializer-string for array of char The code is in a pretty good state as there is only one warning reported.
#Kernel linux driver#
It will run static checker over every file that is being compiled in. This is the example output of running sparse over the dgap driver from the staging area. The usage is very simple as there is a *make* option for it. Moreover the releases can be downloaded from and installed using the *make & make install* combo.
#Kernel linux install#
On Ubuntu it is enough to type in the terminal: % sudo apt-get install sparse The prerequisite however is to install it which shouldn’t be an issue for a modern Linux distribution. The Linux kernel build system uses the sparse static code analyzer which, when enabled, runs over every file that is compiled and if there is anything wrong with it, reports it. The next step, after improving the style, is to actually fix the broken code. Them to the maintainer, see CHECKPATCH in MAINTAINERS. If any of these errors are false positives, please report patches/0001-serial-jsm-Remove-unnecessary-parameter-from-clear_b.patch has style problems, please review. Total: 0 errors, 1 warnings, 32 lines checked + void (*clear_break) (struct jsm_channel *ch) WARNING: Unnecessary space before function pointer arguments Konrad in linux-mainline on jsm-work % scripts/. As you can see I was careless enough to sneak one coding style issue. This is the sample output for one of the patches that I prepared. The usage is very simple as it checks the input files, which by default are understood to be patches (the product of git format-patch.) There is **-f** option which tells the script that the input is a regular file so it will not check the format of the patch.
#Kernel linux Patch#
Additionally, if the input file is a patch, it verifies if it conforms to the patch format. This very clever script checks either the patches or files for issues in the coding style.
There is a tool called ** which resides in the *scripts* directory of the kernel repository.
#Kernel linux how to#
So now, let’s see how to work on the coding style and on the static code checker complaints. In particular it teaches the proper coding style, then the various areas of the kernel code, and last but not least it makes you a better programmer with the experience that you get. The biggest advantage of this kind of assignment is that it allows you to learn a lot. However there are a few (enough work for everyone) weak spots where things should be improved. In general the code is in pretty good shape because of the policy of not allowing patches which contain such flaws. In essence it is about either making sure that the code follows the coding styleor eliminating the static code checker errors and warnings. This is the easiest type of task and as such it has a very good ratio of difficulty to the learning value. I decided to show the “1” attitude and find a couple of starting points for a newbie (wannabe) Linux kernel contributor. This reminded me of a quote from one of the hacker movies that I enjoyed as a teenager it fits: I immediately saw that I need to be proactive because no one will do any kind of work for me.
In this particular moment I understood what my attitude should be. I answered that given my current level of knowledge the best for me would be to work with one of the maintainers who could tell me what shall be done and later review my work so that I could learn and do something useful at the same time. He asked me if I would like to contribute and when I confirmed, he asked me if I have any idea what I would like to do in the kernel. When I finished the Eudyptula Challenge, a series of programming exercises that teaches you how to contribute to the Linux kernel, I got involved in a discussion with *little* who is the penguin that runs the challenge. I hope that these guidelines will be useful for someone. The learning curve to becoming a Linux kernel developer is pretty steep and choosing the right direction might be somewhat difficult (but not as hard as you think – see my previous article.) However, I have some ideas on how to start this beautiful journey.
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