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    SubjectRe: [patch 1/1] [RFC] uml: add and use generic hw_controller_type->release
    On Fri, May 27, 2005 at 02:39:26AM +0200, wrote:

    > From: Paolo 'Blaisorblade' Giarrusso <>, Chris Wedgwood <>
    > CC: Ingo Molnar <>


    > This is heavily based on some work by Chris Wedgwood, which however
    > didn't get the patch merged for something I'd call a
    > "misunderstanding" (the need for this patch wasn't cleanly
    > explained, thus adding the generic hook was felt as undesirable).

    Looks very reasonable to me and your explaination is much better than
    mine was :-)

    > diff -puN kernel/irq/manage.c~uml-gen-irq-release kernel/irq/manage.c
    > --- linux-2.6.git/kernel/irq/manage.c~uml-gen-irq-release 2005-05-25 01:15:46.000000000 +0200
    > +++ linux-2.6.git-paolo/kernel/irq/manage.c 2005-05-25 01:15:46.000000000 +0200
    > @@ -255,6 +255,10 @@ void free_irq(unsigned int irq, void *de
    > /* Found it - now remove it from the list of entries */
    > *pp = action->next;
    > +
    > + if (desc->handler->release)
    > + desc->handler->release(irq, dev_id);
    > +

    Because right now we know the *only* port that needs a release method
    is UML I wonder if we could do save a couple of bytes & cycles for
    everyone else by doing something like #ifdef CONFIG_IRQ_HAS_RELEASE,
    #endif around that and then letting the Kconfig magic set
    CONFIG_IRQ_HAS_RELEASE as required? If other arches need it thay can
    do the same and if eventually almost everyone does we can kill the
    #ifdef crud?

    Longer term I wonder if some of the irq mechanics in UML couldn't end
    up being a bit more like the s390 stuff too?
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      Last update: 2005-05-27 04:15    [W:0.022 / U:36.200 seconds]
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