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