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| author |   MaJun <majun258@huawei.com> | 2017-05-18 16:19:13 +0800 |
|---|---|---|
| committer |   Marc Zyngier <marc.zyngier@arm.com> | 2017-06-22 14:13:27 +0100 |
| commit | 8b8d94a72fd4e773320173efbc745ed8fe677ac5 (patch) | |
| tree | 583c74fa8023210400310493855d934cff1a2bcb /drivers/irqchip/irq-gic-v3-its.c | |
| parent | irqchip/gic-v3-its: Fix MSI alias accounting (diff) | |
| download | linux-dev-8b8d94a72fd4e773320173efbc745ed8fe677ac5.tar.xz linux-dev-8b8d94a72fd4e773320173efbc745ed8fe677ac5.zip | |
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>
Diffstat (limited to 'drivers/irqchip/irq-gic-v3-its.c')
| -rw-r--r-- | drivers/irqchip/irq-gic-v3-its.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c index 45ea193325d2..b33528026c5c 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; } |