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    SubjectRe: 2.6.17-rc5-mm1
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     > then i guess a quick solution would be to do:
    >
    > if (!irq_desc[irq].irq_handler)
    > __do_IRQ(irq, regs);
    > else
    > generic_handle_irq(irq, regs);
    >
    > in arch/x86_64/kernel/irq.c [and in arch/i386/kernel/irq.c], and
    > __do_IRQ() should handle the old-style irq-type MSI code just fine.

    Indeed (fixing ".irq_handler" to be ".handle_irq"), with that change
    MSI-X works fine with ib_mthca on my system. The only slightly funny
    quirk is that the IRQ type is shown as "PCI-MSI-X-<NULL>", I guess
    because it's printing handle_irq_name(NULL).

    However (as BenH pointed out) there's definitely some work to do to
    untangle MSI...

    - R.
    -
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