x86: add unknown_nmi_panic kernel parameter
It's not possible to enable the unknown_nmi_panic sysctl option until init is run. It's useful to be able to panic the kernel during boot too, this adds a parameter to enable this option. Signed-off-by: NSimon Arlott <simon@fire.lp0.eu> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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