Using the new ( since Linux Kernel 2.6.20 ) workqueue interface

I've been reading about Linux Kernel development / device drivers and all of the books I've looked at use the pre-2.6.20 workqueue interface. This includes the Linux Kernel Module Programming Guide, Robert Love's Linux Kernel Development, and Sreekrishnan Venkateswaran's Essential Linux Device Drivers which was published in Ap开发者_如何学JAVAril 2008!

Does anyone have a guide to using the "new" 2.6.20+ workqueue interface?

Just for reference, Ubuntu 8.04 which I'm developing on at the moment, was released over a year and a half ago and includes kernel 2.6.24.

Edit

stsquad's answer led me to this guide to porting code to the new 2.6.20 workqueue's.

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You can't go wrong with the excellent API articles on LWN (http://lwn.net/Kernel/Index/) which document a lot of the new APIs as they go into the kernel. There is a whole section devoted to Workqueues which is worth a read.

Workqueues have been in the kernel for a while so I assume your thinking about the recent-ish rework of the API.

Whilst I'm at it I can heartily recommend a subscription to LWN. All their articles are available for free after a week or so but it's worth supporting the high quality writing, especially if your an aspiring kernel hacker.