On Fri, 10 May 2013 13:11:51 +0200 "Rafael J. Wysocki" [off-list ref] wrote:

...

quoted

cpu_hotplug_disable() doesn't get compiled unless we've defined
CONFIG_PM_SLEEP_SMP.  I cannot begin to imagine what the logic is
behind that!

I suppose it was only used by suspend/hibernate code paths when this was
introduced.

OK, well I suspect that what I have now is simply wrong for Robin's
application.  Robin, can you please check this?  We probably want to
make the does-something version of cpu_hotplug_disable/enable available
if CONFIG_HOTPLUG_CPU.