Re: [PATCH 1/2] scalable rw_mutex

[Andi Kleen]

> This also allows us to de-uglify workqueue.c a little bit, it uses
> a home-grown cpu_populated_map.

It might be obsolete iff more and more architecture don't use NR_CPUS filled
possible_map anymore (haven't checked them all to know if it's true or not)

If not there are a couple of more optimizations that can be done, e.g.
in networking by converting more code to hotplug notifier.

-Andi
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