From mboxrd@z Thu Jan  1 00:00:00 1970
From: per.fransson.ml@gmail.com (Per Fransson)
Date: Mon, 22 Nov 2010 23:30:32 +0100
Subject: [PATCH] Add call to non-crashing cores through IPI
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On Mon, Nov 22, 2010 at 11:14 PM, Per Fransson
<per.fransson.ml@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