Commit-ID: 8b8d94a72fd4e773320173efbc745ed8fe677ac5
Gitweb: http://git.kernel.org/tip/8b8d94a72fd4e773320173efbc745ed8fe677ac5
Author: MaJun <majun258@xxxxxxxxxx>
AuthorDate: Thu, 18 May 2017 16:19:13 +0800
Committer: Marc Zyngier <marc.zyngier@xxxxxxx>
CommitDate: Thu, 22 Jun 2017 14:13:27 +0100
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@xxxxxxxxxx>
Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx>
---
drivers/irqchip/irq-gic-v3-its.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 45ea1933..b335280 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -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;
}
--
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