> 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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