> I understand that SMM/SMI servicing can take a long time, but SMM/SMI
> shouldn't happen while interrupts are masked using local_irq_disable()
Don't bet on it.
> [included in spin_lock_irq()], at least on x86-architectures. If
> SMM/SMI can happen even then, the NMI fix below could be generalized.
>
> My mention of NMI (which by definition can't be masked) is because NMI
On x86 you can mask NMI briefly if you are willing to do a bit of CPU
abuse. Force an NMI, longjmp out of the handler, and NMI is off until the
next iret instruction or similar.
We don't do this and I think Linus would object to anyone who did 8)
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