Hi Geert,
On 19/05/16 12:08, Geert Uytterhoeven wrote:
> 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...
By how much?
> 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;
I wonder if we couldn't actually unify affinity_hint and
percpu_affinity. I'll have a look.
Thanks,
M.
--
Jazz is not dead. It just smells funny...
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