On Mon, 25 Jun 2019, Gleixner, Thomas wrote: > > The thing is that the interrupt is in edge mode which my tried brain did > not notice yesterday evening. > > In edge mode the remote-irr bit meaning is undefined and as the docs are > unclear it might eventually give the wrong answer. From a hardware view > this makes sense because edge will just fire and forget, while level needs > the explicit ack before sending it again (if still raised at the pin) > > So for edge the issue is different. The spurious interrupt is harmless as > it does not leave stale state in the IO-APIC around. > > I'm working on a clean fix for both the level and the edge problems. Just > at the point to start testing. Will post the result in a couple of hours. > > Thanks, > > tglx > > Hmm, good point. Checking the IO-APIC datasheet again, it's clearly written. Thanks, Robert
