APUS irq patch

[Paul Mackerras]

Roman,

> This patch converts the irq assembly in head.S into C, the only problem is
> that I needed to change a prototype in <linux/irq.h>, as some additional
> info has to be saved/restored during an irq.

Could you describe for us how the APUS interrupt stuff works?  In
looking at your patch, I found myself thinking "there's got to be a
better way" but before making any suggestions I want to make sure I
understand what is being done and why.

Paul.

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