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

Keir Fraser
2006-03-22T11:29:53Z

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