On Thu, Apr 2, 2015 at 2:55 AM, Ingo Molnar <mi...@kernel.org> wrote:
>
> So another possibility would be that it's the third change causing
> this change in behavior:
Oh, yes, that looks much more likely. I overlooked that small change entirely.
> ... since with this we won't send IPIs in a semi-nested fashion with
> an unacked APIC, which is a good idea to do in general. It's also a
> weird enough hardware pattern that virtualization's APIC emulation
> might get it slightly wrong or slightly different.
Yup, that's more likely than the subtle timing/reordering differences
of just the added debug printouts. I agree.
Linus
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