[PATCH 1/2] boot: ignore early NMIs

[Vivek Goyal]

On Mon, Mar 12, 2012 at 03:14:20PM +0900, Fernando Luis Vázquez Cao wrote:

[..]
> The thing is that we want to avoid playing with hardware in the kdump
> reboot patch when we can avoid it, the premise being that it cannot
> be accessed without risking a lockup or worse (as the deadlock accessing
> the I/O APIC showed).

I think there needs to be a limit to being paranoid. On one hand people
want to run panic notifiers, all the kmsg_dump() hooks in panic path, and
on the other hand we are afraid of even disabling LAPIC.

I personally think that disabling LAPIC is reasonably practical solution
to the problem until and unless somebody shows that it deadlocks easily.

Thanks
Vivek