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It's important that we don't leave unassigned IDs in the topology, because the selection mechanism is based on index-based masks, so an unassigned ID will never be kept. This is particularly visible on systems where we cannot access the CPU topology, the package id, node id and even thread id are set to -1, and all CPUs are evicted due to -1 not being set in the "only-cpu" sets. Here in new function "cpu_fixup_topology()", we assign them with the smallest unassigned value. This function will be used to assign IDs where missing in general.