RE: [RFC][PATCH v4 -next 1/4] Move kmsg_dump(KMSG_DUMP_PANIC) belowsmp_send_stop()

[Seiji Aguchi]

>
>I don't know how to prove something is hardened other than not seeing any
>hangs or false reboots on in that piece of code.
>

I don't know how we can prove reliability of smp_send_stop() of all archs as well.

Another possible solution is replacing smp_send_stop() with 
machine_crash_shutdown().
This is a function call stopping other cpus reliably in panic situation
so that kdump can work .
But, I don't know whether it works in all archs.
We need further discussion with Eric for checking this idea is feasible...


I would like to go forward step by step rather than doing tough work at once.
I think just moving kmsg_dump() below smp_send_stop() is a good start for improving pstore.

Seiji
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