Re: atomics: document that linux expects certain atomic behaviourfrom unsigned long

[Alan Cox]

> If it is okay and linux relies on it, it should be documented.
> 
> If it is not okay, I guess we should document it, too -- it seems to
> be common mistake. 

A lot of old code did it knowing it was under the BKL, outside of the BKL
its a very bad idea. There were lots of them in the tty layer and I don't
doubt there are some left I missed too 8(
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