Re: [2.4.17/18pre] VM and swap - it's really unusable

Daniel Phillips
2002-01-13T21:59:35Z

On January 12, 2002 09:21 pm, Alan Cox wrote:
> > > I didn't see anywhere you check disable_irq(). Even if you did it doesnt
> > > help when I mask the irq on the chip rather than using disable_irq() calls.
> >
> > Well, if IRQs are disabled we won't have the timer... would not the
> > system panic anyhow if schedule() was called while in an interrupt
> > handler?
>
> You completely misunderstand.
>
> disable_irq(n)
>
> I disable a single specific interrupt, I don't disable the timer interrupt.
> Your code doesn't seem to handle that. Its just one of the examples of where
> you really need priority handling, and thats a horrible dark and slippery
> slope

He just needs to disable preemption there, it's just a slight mod to
disable/enable_irq. You probably have a few more of those, though...

--
Daniel