hvc_console & interrupts: reworked patch

[Benjamin Herrenschmidt]

> Well, I'm not sure if there is a bug or not but in my testing today I've
> found that console input stops working after a few characters on a
> Power-5 system.  I don't think this behavior is related to what I was
> getting at in my earlier email but I'll investigate.  I should be able
> to track down what is happening pretty easily.

Couldn't reproduce a problem on a squadron here, apparently interrupts
are beeing used.

Ben.


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