On Fri, May 10, 2013 at 10:03:24AM -0700, Andrew Morton wrote:

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

quoted

...

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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.

This patch came from "Srivatsa S. Bhat" [off-list ref],
I think I need to defer.

I spent all day trying to get an alpha cross compiler to build an
unmodified kernel and modules, only to find I didn't need to go that
far and could reproduce the failure with just building vmlinux.

Sorry for my slow response,
Robin