The offline CPUs need to assigned to something incase they come online
later, otherwise anyone using the mapping for things other than affinity
will have blank entries for that online CPU.
I don't really like the idea behind it. Back when we came up with
this code I had some discussion with Thomas if we should do the
assignment only for online CPUs, or maybe for all possible CPUs.
Except for some big iron with physical node hotplug the difference
usually is just that some nodes have been temporarily offlined. So
maybe we need to bite the bullet and move the irq and block code
to consider all possible cpus.
I tend to agree.
Would be great if we could have a cpuhp_register() for external users
that would get ops + state mask structure to act on (this case would
need CPUHP_OFFLINE, CPUHP_ONLINE). We do have something similar
for mmu (mmu_notifier).
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