RT merge *hooray*, let's work the problems

I am *very* delighted that the realtime patch set is moving into the mainline kernel tree. There are massive numbers of devices that need this better real-time capabilities.

I think it should be entirely expected that some mechanisms (such as BPF) have trouble interacting with a "new" capability. I would like to see reasoned, careful discussions about how to try to resolve them, instead of simply saying "you can't do 2 things that are both useful". I hope that's where this will go.