Re: [RFC PATCH 23/35] Add support for Xen event channels.

[Keir Fraser <Keir.Fraser@cl.cam.ac.uk>]

On 22 Mar 2006, at 08:36, Arjan van de Ven wrote:

> > +#include <linux/interrupt.h>
> > +#include <linux/sched.h>
> > +#include <linux/kernel_stat.h>
> > +#include <linux/version.h>
>
> this highly looks that it's not possible to be used outside the linux
> kernel so the license is odd

It can't be used directly, but other OS ports steal fairly directly 
from this file (and others). For example OpenSolaris and the BSDs.

> > +static int find_unbound_irq(void)
> > +{
> > +	int irq;
> > +
> > +	for (irq = 0; irq < NR_IRQS; irq++)
> > +		if (irq_bindcount[irq] == 0)
> > +			break;
> > +
> > +	if (irq == NR_IRQS) {
> > +		printk(KERN_ERR "No available IRQ to bind to: increase 
> > NR_IRQS!\n");
>
> there is no way to share interrupts? A shame

256 allocatable IRQs seems plenty to be getting on with. Shared IRQs 
can certainly be added later -- there are no hidden gotchas I'm pretty 
sure.

 -- Keir

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