> Presumably we need something like IRQF_MSI which can be set as
> appropriate depending on the architecture?
Unfortunately I don't think it's that simple -- drivers would have to
do something like
if (IRQF_MSI == IRQF_SHARED) {
// lose MSI optimizations, do an MMIO read, etc.
} else...
As I said I think that if we're running on a system where MSI
interrupts might be shared, we should just have pci_enable_msi() fail
so drivers fall back to their usual interrupt handler.
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