[RFC/PATCH] powerpc: Add irqtrace support to 32-bit powerpc

[Johannes Berg]

> My apologies, Johannes.  I made some unwarranted assumptions about
> register usage in the lowest-level exception handlers.  While it worked
> on my 7447 board, I saw similar random failures on the 85xx (booke) system
> I tried.

No harm done, just wanted to give it a try and let you know it failed.

> Thanks for testing this.
> 
> I'll follow up with a revised patch.

Great, thanks! I'll test that as well then.

johannes
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