Re: [PATCHv2] PCI: vmd: Use affinity to chain child device interrupts

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On Tue, Mar 13, 2018 at 05:24:40PM -0600, Keith Busch wrote:
> On Tue, Mar 13, 2018 at 02:18:07PM -0600, Keith Busch wrote:
> > 
> > And since you brought my attention to it, I see the 'if' is off by one.
> > Let me prepare a v3, and I've one other minor optimization to add as
> > well.
> 
> Ugh, I may need to request withdrawing this patch entirely. This will
> completely break if the VMD interrupt vector's SMP affinity is a subset
> of the child driver's, and the CPUs in the intersection of those masks
> are set offline after driver initialization.
> 
> That's looking like a pretty tricky problem to fix, all for (somewhat)
> obscure kernel feature... I can't see how without a new hot cpu notifier.
> 
> Let me request a pause on this one and I'll get back ASAP.

OK, I will mark it as "Not Applicable" and will wait for an updated
version then.

Thanks,
Lorenzo



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