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SubjectRe: Bottom Handles/soft irqs/timer interrupts/SMP .....

> The slab code was using smp_call_function until davem fixed it.
> On sparc blocking interrupts does not block the reception of cpu cross
> calls, so you cannot do anything like grab locks within a called function.

Funny, are IPI really absolute nmi on sparc? I am honestly curious,
for what purpose such IPIs were designed. Theay do not look useful.

The fix is worth than problem was in any case. Waiting for timer
under semaphore is not a good idea.

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