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Subject: Re: Alans example against preemtive kernel (Was: Re: [2.4.17/18pre] VM and swap - it's really unusable)
To: roger.larsson@norran.net (Roger Larsson)
Date: Mon, 14 Jan 2002 09:18:47 +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: <200201140725.g0E7PkT22694@mailb.telia.com> from "Roger Larsson" at Jan 14, 2002 08:22:39 AM
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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
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> This should be mostly OK for the preemptive kernel. Swapping the irq an=
> d spin=20
> lock lines should be preferred. But I think that is the case in SMP too=
> =2E..

You deadlock if you swap the two lines over. In this case for pre-empt you
really have to go in and add non pre-emption places to the driver
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