Hi Marc,
On Mon, Apr 11, 2016 at 10:57 AM, Marc Zyngier <marc.zyngier@xxxxxxx> wrote:
> In order to prepare the genirq layer for the concept of partitionned
> percpu interrupts, let's allow an affinity to be associated with
> such an interrupt. We introduce:
>
> - irq_set_percpu_devid_partition: flag an interrupt as a percpu-devid
> interrupt, and associate it with an affinity
> - irq_get_percpu_devid_partition: allow the affinity of that interrupt
> to be retrieved.
>
> This will allow a driver to discover which CPUs the per-cpu interrupt
> can actually fire on.
>
> Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx>
> --- a/include/linux/irqdesc.h
> +++ b/include/linux/irqdesc.h
> @@ -66,6 +66,7 @@ struct irq_desc {
> int threads_handled_last;
> raw_spinlock_t lock;
> struct cpumask *percpu_enabled;
> + const struct cpumask *percpu_affinity;
Adding this field showed up on my bloat-o-meter radar...
Does it make sense to move it (and percpu_enabled) inside the "#ifdef
CONFIG_SMP" below, and rework the code to not need it on UP?
> #ifdef CONFIG_SMP
> const struct cpumask *affinity_hint;
> struct irq_affinity_notify *affinity_notify;
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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