RE: [PATCH 1/2] x86, reboot: revert stop_other_cpus to using IRQwith NMI fallback

[Seiji Aguchi]

> +	/* if the REBOOT_VECTOR didn't work, try with the NMI */
> +	if ((num_online_cpus() > 1) && (!smp_no_nmi_ipi))  {
> +		if (register_nmi_handler(NMI_LOCAL, smp_stop_nmi_callback,
> +					 NMI_FLAG_FIRST, "smp_stop"))

register_nmi_handler() doesn't work if kernel panics in nmi context because kzalloc() is called in register_nmi_handler() and 
it may sleep.

register_nmi_handler() should be replaced with notifier_chain like kdump does.

Seiji
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