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

[Johannes Berg]

> This version takes care to save and restore *all* the volatile registers
> around the call to trace_hardirqs_off in transfer_to_handler, and should
> fix the anomalies seen by Johannes Berg.  I've tested on 7447- and 8548-
> based boards.

Still has problems on my machine. Maybe to do with non-maskable PMU
interrupts? (saw a patch about something like that float by, don't
really have any idea whether it's related to this work or not)

johannes
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