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irqchip/gicv3-its: Skip irq affinity setting when target cpu is the same as current setting 

Just skip the irq affinity setting when the target cpu is the same as
current setting.
This is a small optimization for irq affinity setting logic.

Signed-off-by: MaJun <majun258@huawei.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
MaJun 2017-05-18 16:19:13 +08:00 committed by Marc Zyngier
parent 3403b0259d
commit 8b8d94a72f
1 changed files with 6 additions and 3 deletions
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9
drivers/irqchip/irq-gic-v3-its.c
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@ -644,9 +644,12 @@ static int its_set_affinity(struct irq_data *d, const struct cpumask *mask_val,
if (cpu >= nr_cpu_ids)
return -EINVAL;
target_col = &its_dev->its->collections[cpu];
its_send_movi(its_dev, target_col, id);
its_dev->event_map.col_map[id] = cpu;
/* don't set the affinity when the target cpu is same as current one */
if (cpu != its_dev->event_map.col_map[id]) {
target_col = &its_dev->its->collections[cpu];
its_send_movi(its_dev, target_col, id);
its_dev->event_map.col_map[id] = cpu;
}
return IRQ_SET_MASK_OK_DONE;
}