Re: [PATCH] Prevent nested interrupts when the IRQ stack is near overflowing v2

[Andi Kleen]

> Now, I think (and sincerely) that the SCSI situation is likely long since 
> fixed, but we have thousands and thousands of drivers, and these kinds of 
> things are very hard to notice automatically. Are there any cases around 
> that still have busy-loop delays based on real-time in their irq handlers? 
> I simply don't know.

This case was already broken back when the x86-64 port used to run
with NMI watchdog on by default, because any IO exception handling
with interrupts off would trigger the NMI watchdog eventually.

I remember having to add bandaids to Fusion for this a long time ago.

Of course ISA drivers might still do it.

-Andi
-- 
ak@xxxxxxxxxxxxxxx -- Speaking for myself only.
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