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    SubjectRe: [PATCH HACK] powerpc: quick hack to get a functional eHEA with hardirq preemption
    On Mon, Sep 15, 2008 at 03:13:32PM +0200, Sebastien Dugue wrote:
    > > we are a bit worried about putting this into the mainstream part of non real
    > > time linux.
    > Heck, I sure do not want this to be applied mainstream nor into any tree.
    > The sole purpose of this patch was to trigger some reaction from the people who
    > know the hardware and try to understand where the problem lies.
    > > There interrupts work perfectly fine, and it was a bit of a
    > > challenge to get there for all cases / configurations / machines.
    > Agreed, but the fact that it fails with hardirq preemption leads me to
    > believe (without any more knowledge about the harware) that there might be
    > something amiss with this driver (or the code concerning the XICS)
    > nevertheless.
    > >
    > > Could you try to enable these changes only for RT-Linux via a real-time
    > > kconfig switch?
    > Nope, this is just a quick hack that allows me to have a functional eHEA under
    > the rt kernel. I want to understand what the problem is:
    > - Is the eHEA really delivering level interrupts to the XICS?
    > - Is the XICS loosing interrupts when they are masked?

    There is a known bug in the -rt kernels, the bug causes handlers
    to lose edge interrupts.

    See this patch:

    > - ...?

    Anton Vorontsov

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