Re: [PATCH][2.6.9-rc2-mm3] perfctr ppc32 preliminary interrupt support

[Mikael Pettersson]

On Mon, 27 Sep 2004 09:49:45 +1000, Benjamin Herrenschmidt wrote:
> Be careful that some G4's have a bug which can cause a
> perf monitor interrupt to crash your kernel :( Basically, the
> problem is if any of TAU or PerfMon interrupt happens at the
> same time as a DEC interrupt, some revs of the CPU can get
> confused and lose the previous exception state.

Oh I'm very much aware of that erratum. That's why I never
even tried implementing this while I only had a 750/G3.
The error appears to affect all classic 750s, all 7400s,
and early 7410s. Late 7410s and all 744x/745x are Ok.
I don't know if IBM's recent 750s (GX/FX) have the error,
but their 750CXs do.

/Mikael
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