RE: [PATCHV2 2/3] x86, ras: Extend machine check recovery code to annotated ring0 areas

[Luck, Tony]

>> +	/* Fault was in recoverable area of the kernel */
>> +	if ((m.cs & 3) != 3 && worst == MCE_AR_SEVERITY)
>> +		if (!fixup_mcexception(regs, m.addr))
>> +			mce_panic("Failed kernel mode recovery", &m, NULL);
>				   ^^^^^^^^^^^^^^^^^^^^^^^^^^^
>
> Does that always imply a failed kernel mode recovery? I don't see
>
>	(m.cs == 0 and MCE_AR_SEVERITY)
>
> MCEs always meaning that a recovery should be attempted there. I think
> this should simply say
>
>	mce_panic("Fatal machine check on current CPU", &m, msg);

I don't think this can ever happen. If we were in kernel mode and decided
that the severity was AR_SEVERITY ... then search_mcexception_table()
found an entry for the IP where the machine check happened.

The only way for fixup_exception to fail is if search_mcexception_table()
now suddenly doesn't find the entry it found earlier.

But if this "can't happen" thing actually does happen ... I'd like the panic
message to be different from other mce_panic() so you'll know to blame
me.

Applied all the other suggestions.

-Tony

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