When to use threaded interrupts?

[Kosta Zertsekel]

Hi guys,

I hope I'm on right mailing list. :-)
I think I get the pro of using threaded interrupts - to decrease the maximum
interrupt latency on RT workloads and/or RT machines (servers, embedded,
etc.).

Also, I see that in 4.2 there are only ~76 drivers that use threaded
interrupt:
```
$ git grep -l IRQ_WAKE_THREAD | sort | grep -v "\.h" | wc -l
76
```

​So, I'd like to ask:
   - Why not **all** of the drivers use the threaded interrupts?
   - What are the cons of the threaded interrupts?​

Thanks,
--- KostaZ
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