On 177, 06 26, 2003 at 12:13:18PM +0100, Christoph Hellwig wrote:
> > +#ifndef HAVE_ARCH_IRQ_DESC
> > +
> > +/*
> > + * Controller mappings for all interrupt sources:
> > + */
> > +irq_desc_t irq_desc[NR_IRQS] __cacheline_aligned = {
> > + [0 ... NR_IRQS - 1] = {
> > + .handler = &no_irq_type,
> > + .lock = SPIN_LOCK_UNLOCKED,
> > + }
> > +};
> > +
> > +#endif
>
> What about getting rid of that ifdef and having irq_desc always
> in arch code? Seems a lot cleaner to me.
So it will be duplicated in allmost every architecture ?
> > +#if defined(CONFIG_SMP) && !defined(HAVE_ARCH_SYNCRONIZE_IRQ)
> > +
> > +inline void synchronize_irq(unsigned int irq)
> > +{
> > + irq_desc_t *desc = irq_desc(irq);
> > +
> > + /* is there anything to synchronize with? */
> > + if (!desc->action)
> > + return;
> > +
> > + while (desc->status & IRQ_INPROGRESS)
> > + cpu_relax();
> > +}
> > +
> > +#endif
>
> Hmm, what arch can't use the generic version and why? I really
> don't like the HAVE_ARCH_ macros if there's a way around it.
This function implemented differently in allmost every architecture.
I beleive that most of them can use generic version, but I'm still not sure.
v850 and mips define synchronize_irq() as barrier() for example.
> > +#ifndef HAVE_ARCH_IRQ_PROC
> > +void register_irq_proc(unsigned int irq);
> > +#endif
>
> Again, what arch can't use the generic code?
IIRC v850 architecture doesn't need it at all.
> > +#ifndef HAVE_ARCH_IRQ_PROBE
> > +
> > +/*
> > + * IRQ autodetection code..
> > + *
> > + * This depends on the fact that any interrupt that
> > + * comes in on to an unassigned handler will get stuck
> > + * with "IRQ_WAITING" cleared and the interrupt
> > + * disabled.
> > + */
>
> Which architecture uses it's own version here? Also we might
> move this to a separate file as it doesn't make a lot of sense
> without CONFIG_ISA
Some architectures provide empty stubs for these functions.
I'm not sure about CONFIG_ISA, IMHO any legacy device driver
can use irq autoprobing.
> Otherwise it looks fine (of course)! Let's hope we'll get some variant
> of it in before 2.6.
-- Andrey Panin | Linux and UNIX system administrator pazke@donpac.ru | PGP key: wwwkeys.pgp.net
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