RE: [PATCH]Skip unnecessary WARN_ON in panic case

[Seiji Aguchi]

Thank you for giving me the feedback.

> 
> So it appears the problem occurs because the other CPUs are not offlined correctly, and still have pending work which may generate
> wakeup IPIs to them?

Right.

> 
> The fix would be to either offline them properly - or, if we don't want to do that to keep panicking simple, why do we mark them
> offline? They aren't really offline in a proper way.

To offline cpus properly, it should be done with threads like stop_machine().
But I don't think it is reasonable to kick the threads in panic case.
Therefore, I will make a patch keeping cpus online.
Also, to inform a panicked cpu that other cpus stopped surely,
 I will  introduce a new cpu_mask like cpu_stopped_mask.

Seiji
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