Both kdb and lkcd use cross cpu NMI for debugging and dumping on SMP.
That plus oprofile and the NMI watchdog makes at least four users of
NMI. A one level hook is not going to cut it, it should be a list.
I admit that removal of a hook from the NMI list while still handling
NMI interrupts is "interesting", but that is a SMOP ;). RCU to the
rescue?
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