[PATCH] [ppc64] Restore smt-enabled=off kernel command line option

[Anton Blanchard]

> Whoops, sorry, didn't mean to break smt-enabled=off.

No problem, it gave me a chance to clean up some more code :)

> As you mentioned, we do not have any code which updates the present map
> when a cpu is added or removed.  What we really need is cpu-specific
> hooks in of_add_node/of_remove_node which will take care of that.  I'll
> send along a patch for that shortly.

Ahh yes that makes sense. Can we initially set it up so if we boot ST or
with maxcpus= that its still possible to hotplug add the threads or
cpus?

Anton