[PATCH v2] powerpc: Add irqtrace support for 32-bit powerpc

[Johannes Berg]

> Note that I've been wondering wether we should attempt to trace all
> those IRQ state change internally to the exception code. I've looked at
> not doing it, which simplifies things a bit.
> 
> Unfortunately, that will make us occasionally trace redundant
> enable/disable (which isn't a big problem per-se, just counters).

We already have a huge number of redundant enable/disable, about 40% of
all events on both 32 and 64-bit.

johannes
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