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

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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;
}