Re: [PATCH, RFC] improved hacks to allow -rt to run kernbench on POWER

[Peter Zijlstra <peterz@infradead.org>]

On Tue, 2007-11-13 at 11:05 +0100, Peter Zijlstra wrote:

> Anyway, it seems its the generic irq stuff that uses raw_spinlock_t and
> disables IRQs, so there isn't much we can do from the ARCH level I'm
> afraid :-(
> 
> Ingo, any sane ideas?

Ok benh came up with a workable idea, he just needs a night's sleep to
come up with the details :-)

The idea is to fill the radix tree from host->ops->map() (or
irq_create_mapping()) as that should still be preemptable, and then
convert all other uses to RCU lookups.



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