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SubjectRE: [PATCH v3] x86/mce: retrieve poison range from hardware
+	m.misc = (MCI_MISC_ADDR_PHYS << 6) | __ffs64(mem_err->physical_addr_mask);

Do we want to unconditionally trust the sanity of the BIOS provided physical_address_mask?

There's a warning comment on the kernel __ffs64() function:

* The result is not defined if no bits are set, so check that @word
* is non-zero before calling this.

Otherwise, this looks like a good idea.


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