> alan@lxorguk.ukuu.org.uk (Alan Cox) writes:
>
> > 3. Drivers that get repeated interrupts appear to re-enter the handler
> > uncontrollably blow the stack and crash. I suspect nested interrupt
> > handling problems may be half the 8K stack issue, and could be tons
> > of our other remaining bugs.
>
> How about using a separate per-CPU 16K stack for interrupts, instead of
> handling them on the per-process kernel stack? Then we could probably
> switch back to 4K process kernel stacks too.
No, the interrupt stack issue must be a red herring. We must _never_ get
nested interrupts, no matter what. Using a separate stack is never an
acceptable solution, it just means we have other problems.
I don't think Alan is right about the interrupts, because I went through
those with a tooth-brush, but there might be something I missed. And there
might be something with bottom half handlers or similar - those are fairly
subtle too..
Linus
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