Now I make two expensive indirect jumps per irq.
> At least it would force driver writers to address the shared interrupt
> issue, and if the kernel determines that nobody claims the interrupt
> it could do something about it, like complain, which it can't do at
> the moment. Something that has caused me endless problems on a laptop
> with some unidentifiable PCI device generating unhandled interrupts.
Drivers that don't do proper checking get noticed quite fast - as you've
discovered.
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