From: MaJun Date: Thu, 18 May 2017 08:19:13 +0000 (+0800) Subject: irqchip/gicv3-its: Skip irq affinity setting when target cpu is the same as current... X-Git-Tag: v4.13-rc1~190^2^2~20 X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=8b8d94a72fd4e773320173efbc745ed8fe677ac5;p=linux-block.git 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 Signed-off-by: Marc Zyngier --- 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; }