Re: [2.4.17/18pre] VM and swap - it's really unusable
Daniel Phillips (phillips@bonn-fries.net)
Mon, 14 Jan 2002 06:59:35 +0100
On January 13, 2002 04:59 pm, Alan Cox wrote:
> > > I disable a single specific interrupt, I don't disable the timer
interrupt.
> > > Your code doesn't seem to handle that.
> >
> > It can if we increment the preempt_count in disable_irq_nosync and
> > decrement it on enable_irq.
>
> A driver that knows about how its irq is handled and that it is sole
> user (eg ISA) may and some do leave it disabled for hours at a time
Good point. Preemption would be disabled for that thread if we mindlessly
shut it off for every irq_disable. For that driver we probably just want to
leave preemption enabled, it can't hurt.
--
Daniel
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