Just FYI: the change was done in the first place to allow spawning a
new init thread as CPUs come up. But now we have copy_process it can
be done neatly (it should also be done out of keventd so we get a
clean thread, but that's another story).
Note that this version also has a (theoretical) race, except hidden
by the time to wrap PIDs ie. "never happens".
Thanks!
Rusty.
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