Verify that the NMI action being set is valid.  The default NMI action
changes from the non-standard 'kdb' to the more standard 'dump'.
Signed-off-by: NMike Travis <travis@sgi.com>
Reviewed-by: NRuss Anderson <rja@hpe.com>
Reviewed-by: NAlex Thorlton <athorlton@sgi.com>
Acked-by: NThomas Gleixner <tglx@linutronix.de>
Acked-by: NDimitri Sivanich <sivanich@hpe.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20170125163517.922751779@asylum.americas.sgi.comSigned-off-by: NIngo Molnar <mingo@kernel.org>