[PATCH] Add call to non-crashing cores through IPI

[Per Fransson]

On Mon, Nov 22, 2010 at 11:14 PM, Per Fransson
<per.fransson.ml at gmail.com> wrote:
>>>
>>> That's for the situation when the other core tries to send an IPI at
>>> the same time. Unlikely but both cores may deadlock.
>>>
>>
>> Am I right that deadlock can occur only if the same IPI was sent? And
>> there should
>> be no situation when CRASH_DUMP IPI was sent from different processors at
>> the same time.
>>
>
> I hope you are right, but I can't see why we couldn't get a crash IPI
> from several
> processors at the same time, unfortunately.
>

I'll just follow up my own post here. On second thought, crash_kexec()
takes the kexec_mutex,
so simultaneous crash IPIs probably couldn't happen.

/Per