RE: [PATCH v3] x86/mce: retrieve poison range from hardware

[Luck, Tony]

> It appears the kernel is trusting that ->physical_addr_mask is non-zero
> in other paths. So this is at least equally broken in the presence of a
> broken BIOS. The impact is potentially larger though with this change,
> so it might be a good follow-on patch to make sure that
> ->physical_addr_mask gets fixed up to a minimum mask value.

Agreed. Separate patch to sanitize early, so other kernel code can just use it.

-Tony