spinlockup detection on POWER3

[Olaf Hering]

 On Sun, Jan 22, Olaf Hering wrote:

> Does the CONFIG_DEBUG_SPINLOCK code  somehow depend on the cpu type?
> It triggers alot on a p270 POWER3 box, even during early boot. I dont 
> see it on POWE4/5.

> BUG: spinlock lockup on CPU#3, hotplug/1384, c000000000456900
...

this was cause by per_cpu data corruption.

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