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patch link:
https://lore.kernel.org/r/20221027074314.2084016-1-npiggin%40gmail.com
patch subject: [PATCH] powerpc/books: Never call nmi_enter for real-mode NMIs
config: powerpc-allnoconfig
compiler: powerpc-linux-gcc (GCC) 12.1.0
reproduce (this is a W=1 build):
w
NMIs that are taken in real mode (the early MCE and HMI handlers)
skipped calling nmi_enter() in some configurations, in the hope that
more modern configurations like radix suffer fewer restrictions. This
just turns into whack-a-mole and fragile when core kernel code changes
anything.
A recent su
