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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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