performance monitor exceptions

[Anton Blanchard]

> Bingo ! That seems to be the one:
>
> http://www.mot.co.jp/SPS/html/lit/pdf/mpc7410pns_rev0.pdf
>
>   #5:
>   Description: Consecutive Performance Monitor, Decrementer,
>   or Thermal Management Interrupts may become non-recoverable.
>
>   Work-Around: Avoid enabling any combination of
>   Performance Monitor, Decrementer, or Thermal Management
>   Interrupts at the same time.

Thats rather ugly :( BTW I have run kernel profiling off the performance
monitor exception on ppc64 which has been very useful (it allowed us
to profile inside interrupt disabled regions)

Anton

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