oprofile/nmi timer: Convert to hotplug state machine

Install the callbacks via the state machine and let the core invoke
the callbacks on the already online CPUs.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: oprofile-list@lists.sf.net
Cc: Robert Richter <rric@kernel.org>
Cc: rt@linutronix.de
Link: http://lkml.kernel.org/r/20161126231350.10321-6-bigeasy@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

path: root/REPORTING-BUGS

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