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Becoming a Linux Kernel Programmer?
Young Grasshoopa asks: "In my 6 years of IT life, I've been a sys admin, perl programmer, and a config. mgmt. engineer. I've recently learned programming in C, and somehow ended up learning a bit of Linux Kernel programming as well. I now have developed a strong motivation to become a Linux kernel developer, but given my background, I am not sure how to approach companies or Open Source Project groups. I ask all those who were in a similar situation - how do you become a full-time kernel developer?"
KernelNewbies?
If you have, you may want to consider starting out as a kernel janitor (basically doing assloads of grunt work to build a name for yourself).
I would consider myself a kernel developer at this stage, even before my driver is included in the mainstream kernel versions.
It sounds like you are at this stage already, so are you actually asking "How do I get a driver included in the kernel as distributed?". Well I think the answer to that is to keep submitting it to the maintainer of the relevant kernel. Things like revelance, and especially quality are important factors too.
For anyone at an earlier stage, perhaps "normal" programmers who need to learn how it all works in the kernel, I have (reccomend is too strong a word, as I have only read these 2 books on the topic) read 2 OReilly books.
Understanding the Linux Kernel, 2nd Edition and Linux Device Drivers, 2nd Edition
Of course you should also be on the linux kernel mailing list
And the rest is dependant on exactly you want to add to the kernel.
The Linux Kernel Janitor Project might be a good place to start.
http://sourceforge.net/projects/kernel-janitor
Finding an employer who will pay you...
You make it sound so impossible. However...
Today's Going Pay Rate for a Kernel Developer:
* Excellent
* $110K
* Market
* Open
* $110K-$125K
* Competetive
* Open
* Competetive
* Market
* $80K-$95K
And that's just 10 of 56. And look at some of the salaries! And look at the fact that, it would seem, Linux is beginning to be used everywhere. Therefore, it would seem one might look forward to a long, lucrative career as a Kernel hack. No?
You get into the projects in exactly the same way: start off doing some small useful things (docs, janitor work, UI design, whatever) and then sooner or later you'll inevitably find yourself maintaining a driver or whatever. Next thing you're making changes to sub system APIs, and you work from there.
There's no magic and there is no cabal.
If you're asking about specific organisations to help you on the way in, the other posters have already mentioned kernel janitors and kernel newbies, both of which are good.
I became a kernel hacker through a rather unusual route: my M.Sc. supervisor spotted missing functionality and suggested I had a crack at it.
-- Remove the trailing '\0' to email me.
Find a network card that is ill-supported in Linux and start working on it. See if you can find the card in used computer places and start tweaking the code.
A while ago when I was trying out a new kernel version I saw that one of the cards I had did not compile well. I dug into the code and saw a function name change was all that was required. I had to tweak another kernel a little to get it to compile under a new gcc version. No it didnt run well but it did compile and boot.
Just exploring like this and reading the kernel hackers guide driver guide and other things will give you a good handle on the internals, at least from the drivers perspective. Several month of kernel tweaking later, the vm, scheduler and the other stuff will become clear as you gain interest. However the market will be biggest for kernel ports to new architectures and drivers for newer network adapters. Keep your skills sharp there, build a portfolio and surf dice.com regularly.
"Give orange me give eat orange me eat orange give me eat orange give me you." -Nim Chimpsky