Re: [PATCH 0/5] More NMI IPI enablement work

On Thu, 21 Sep 2017 21:10:42 +1000
Michael Ellerman [off-list ref] wrote:

Nicholas Piggin [off-list ref] writes:

quoted

Hi,

Here is the NMI IPI enablement for powernv, which requires
supported firmware and hardware:

https://lists.ozlabs.org/pipermail/skiboot/2017-September/009111.html

And some preceeding patches that fix issues I ran into when
testing it.  

Are any of these critical such that I should pick them up for 4.14 or
earlier?

Good point, yes. The hardlockup watchdog now does SMP cross-checking,
so it can blow up when you stay in xmon for about 10 seconds since the
new watchdog was merged. We want patches 3-4 for that.

Patch 1 is not really required, I only ran into it when I tried making
smp_send_stop use the NMI IPI, which we are not doing just yet. That
being said, the watchdog code is new, so probably doesn't hurt to put
in 4.14.

Patch 3 makes all-cpus backtraces a bit more concise. Less critical.

The system reset stuff I guess we'll want to backport for distros, so
4.14 might be reasonable not sure.

Actually patch 5 before you merge it I should remove the DD1
workaround too because we're not supporting that in OPAL anymore.

Thanks,
Nick