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Subject: Re: [2.4.17/18pre] VM and swap - it's really unusable
To: rml@tech9.net (Robert Love)
Date: Sun, 13 Jan 2002 15:59:38 +0000 (GMT)
Cc: alan@lxorguk.ukuu.org.uk (Alan Cox), arjan@fenrus.demon.nl,
        landley@trommello.org (Rob Landley), linux-kernel@vger.kernel.org
In-Reply-To: <1010891457.3561.18.camel@phantasy> from "Robert Love" at Jan 12, 2002 10:10:55 PM
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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
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> > 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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