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From: Daniel Phillips <phillips@bonn-fries.net>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>, rml@tech9.net (Robert Love)
Subject: Re: [2.4.17/18pre] VM and swap - it's really unusable
Date: Mon, 14 Jan 2002 06:59:35 +0100
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Cc: alan@lxorguk.ukuu.org.uk (Alan Cox), arjan@fenrus.demon.nl,
        landley@trommello.org (Rob Landley), linux-kernel@vger.kernel.org
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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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