SMP busted on non-cpu-hotplug systems

[David S. Miller]

I just noticed this on sparc64, as I lost 31 cpus on my
Niagara box due to it :)

boot_cpu_init() sets the boot processor ID in cpu_present_map.

But fixup_cpu_present_map() will only populate the cpu_present_map if
it is empty, which it won't be because of what boot_cpu_init() just
did.
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