[PATCH 2/2] powerpc: Handle MCE on POWER9 with only DSISR bit 33 set

[Michael Ellerman]

Michael Neuling <mikey at neuling.org> writes:

> On POWER9 DD2.1 and below, it's possible to get Machine Check
> Exception (MCE) where only DSISR bit 33 is set. This will result in
> the linux MCE handler seeing an unknown event, which triggers linux to
> crash.

Why do we get a machine check with just one bit set, and why is it OK to
just treat it as handled without doing anything?

Is it just entirely spurious?

cheers