On Thu, 21 Oct 2010, Richard Weinberger wrote:
> Am Donnerstag 21 Oktober 2010, 18:09:22 schrieb Thomas Gleixner:
> > On Thu, 21 Oct 2010, Richard Weinberger wrote:
> > > Thomas,
> > >
> > > Your commit c5f7563 ("genirq: Provide compat handling for
> > > chip->enable()") breaks UML.
> > > It does not start anymore.
> > >
> > > When I apply this patch it works fine again.
> > > http://userweb.kernel.org/~akpm/mmotm/broken-out/um-migrate-from-__do_irq
> > > -to- generic_handle_irq.patch
> > >
> > > Maybe your patch breaks all users of __do_IRQ()?
> >
> > Not intentionally :)
> >
> > The irq_chip of um has it's own dummy enable function, so the compat
> > code uses it.
> >
> > +static void compat_irq_enable(struct irq_data *data)
> > +{
> > + data->chip->enable(data->irq);
> > +}
> > +
> >
> > ...
> >
> > + if (chip->enable)
> > + chip->irq_enable = compat_irq_enable;
> > +
> > + /*
> > + * The real defaults
> > + */
> > + if (!chip->irq_enable)
> > + chip->irq_enable = default_enable;
> >
> > So I really can't see how's that supposed to break UM
> >
>
> This patch solves the issue for me.
> What do you think?
>
> Thanks,
> //richard
>
> diff --git a/kernel/irq/resend.c b/kernel/irq/resend.c
> index 891115a..1fb4012 100644
> --- a/kernel/irq/resend.c
> +++ b/kernel/irq/resend.c
> @@ -60,8 +60,11 @@ void check_irq_resend(struct irq_desc *desc, unsigned int
> irq)
> /*
> * Make sure the interrupt is enabled, before resending it:
> */
> +#ifndef CONFIG_GENERIC_HARDIRQS_NO_DEPRECATED
> + desc->irq_data.chip->enable(irq);
> +#elif
> desc->irq_data.chip->irq_enable(&desc->irq_data);
> -
> +#endif
> /*
> * We do not resend level type interrupts. Level type
> * interrupts are resent by hardware when they are still
Why shold it solve it ? irq_enable is set to compat_irq_enable which
in turn calls chip->enable.
So how's that different ?
Thanks,
tglx
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