Ask HN: How is kernel code tested?

A quick web search turned up the following links:

- Linux Kernel Testing and Debugging | Linux Journal

http://www.linuxjournal.com/content/linux-kernel-testing-and...

- Fully Automated Testing of the Linux Kernel (PDF)

https://www.kernel.org/doc/ols/2006/ols2006v1-pages-113-126....

- How is linux kernel tested? - Stack Overflow

http://stackoverflow.com/questions/3177338/how-is-linux-kern...