Re: [PATCH 09/10] x86-32: use SSE for atomic64_read/set if available

[Luca Barbieri]

>> If we use the stack instead of per-CPU variables, all IRQs and NMIs
>> preserve CR0 and the SSE registers, so this would be safe, right?
>
> You'd have to take special care to deal with nested IRQs I think.

Could you elaborate on that?
Which issue could there be with nested IRQs?
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