[RFC PATCH] powerpc: improve accounting of non maskable interrupts

Michael Ellerman mpe at ellerman.id.au
Mon Jul 31 20:17:13 AEST 2017

Nicholas Piggin <npiggin at gmail.com> writes:

> This fixes a case of double counting MCEs on PowerNV.
> Adds a counter for the system reset interrupt, which will
> see more use as a debugging NMI.
> Adds a soft-NMI counter for the 64s watchdog. Although this could cause
> confusion because it only fires when interrupts are soft-disabled, so it
> won't increment much even when the watchdog is running.
> Signed-off-by: Nicholas Piggin <npiggin at gmail.com>
> ---
> I can split these out or drop any objectionable bits. At least the
> MCE we should fix, not sure if the other bits are wanted.

Yeah if you can split it please that would be good.

I'm not sure how useful it is to count the SOFT NMIs. I guess it's not
much overhead so we may as well, if nothing else it might be handy for
us debugging.

If you can make the ifdef look less horrendous that would be great :D -
perhaps a kconfig symbol that keys off both.


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