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SubjectRe: [PATCH HACK] powerpc: quick hack to get a functional eHEA with hardirq preemption
On Thu, 25 Sep 2008 17:22:41 +1000 Benjamin Herrenschmidt <benh@kernel.crashing.org> wrote:

> On Thu, 2008-09-25 at 09:18 +0200, Sebastien Dugue wrote:
> >
> > > Ok, that's the right approach then. It should work. I don't know
> > what
> > > the specific problems with HEA are at this stage.
> >
> > Yep, except as it behaves in way that the current -rt fasteoi flow
> > cannot handle.
>
> We probably need to make a special xics flow handler for -rt that does
> what Milton suggested, ie, bring down the CPU priority right away

Do you mean creating a custom fasteoi handler into xics.c? Also, it's
not clear to me from looking at the code how you go about changing the
cpu priority.

> and
> only EOI later or something like that, instead of masking/unmasking.
>
> I don't know what are the other potential issues with the HEA though.

Don't know either, but that I can test.

Thanks,

Sebastien.


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