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

[Maxim Uvarov]

2010/11/22 Catalin Marinas <catalin.marinas at arm.com>:
> On 22 November 2010 17:03, Per Fransson <per.fransson.ml at gmail.com> wrote:
>> On the other hand, do we really need to enable the interrupts before
>> performing an ipi?
>> The important thing must be for them to be enabled on the
>> receiving/callee cores. It's not
>> as if we want the crashing core to be interruptable, is it?
>
> 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 actually had a patch to allow this which was really complicated and
> it still failed in a real-world scenario which I could foresee.
>
> --
> Catalin
>
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-- 
Best regards,
Maxim Uvarov