Re: [PATCH v2 4/5] x86/mce: Simplify flow when handling recoverable memory errors

[Andy Lutomirski]

On Tue, Nov 11, 2014 at 10:34 AM, Andy Lutomirski <luto@xxxxxxxxxxxxxx> wrote:
> On Tue, Nov 11, 2014 at 10:22 AM, Borislav Petkov <bp@xxxxxxxxx> wrote:
>> On Tue, Nov 11, 2014 at 09:15:18AM -0800, Andy Lutomirski wrote:
>>> Oh -- does it need to sleep?
>>
>> Oh yeah, iterates over all tasks and generally async access to VM stuff.
>> You can have a look if bored: mm/memory-failure.c
>>
>> :-)
>>
>>> I find myself wondering whether a much cleaner solution might be to
>>> sync regs and switch stacks before invoking do_machine_check rather
>>> than afterwards.  Then do_machine_check would really be completely
>>> non-atomic.  It would add a few lines of asm, though.
>>
>> That's like wagging the dog.
>
> Wagging this particular dog might shake some loose fur off.  If we did
> this for all paranoid entries, then paranoid_userspace could just be
> deleted.  :)

Andi is about to make this dog even messier.  I think I like my
suggestion more and more.

--Andy
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