RE: [PATCH 2/2] x86/MCE: Add command line option to extend MCE Records pool

[Luck, Tony]

>> and this is exactly what we're doing - adding new memory.
>
> Is the #MC adding new memory, or is the interrupted context adding new
> memory?

The interrupted context is adding the memory.

>> So, until we're absolutely sure that it is ok to interrupt a context
>> holding a spinlock with a #MC which is non-maskable, I don't think we
>> wanna do this.
>
> If it is the #MC adding new memory, agreed.

Not what is happening.

> If the #MC is simply traversing the list, and the interrupted context
> was in the midst of adding a new element, this should be no worse than
> some other CPU traversing the list while this CPU is in the midst of
> adding a new element.
>
> Or am I missing a turn in here somewhere?

Not missing anything. I believe you've answered the question.

-Tony