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

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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