[PATCH] Fix performance monitor exception in 2.6.20-series

[Paul Mackerras]

David Woodhouse writes:

> If we can _make_ it safe, and in doing so avoid the failure mode where
> the machine locks up with interrupts disabled and then the PMU resets
> itself entirely (including the date), that might be a good thing...

Different PMU, I think; they are talking about the Performance Monitor
Unit in POWERx cpus.

Paul.