"I've looked at the [source code for Linux] occasionally. I don't look at it as much as I used to. I used to, for Plan 9. They were always ahead of us—they just had massively more resources to deal with hardware. So when we'd run across a piece of hardware, I’d look at the Linux drivers for it and write Plan 9 drivers for it. Now I have no reason to look at it. I run Linux."