[PATCH 1/6] genirq: allow assigning affinity to present but not online CPUs
From: Christoph Hellwig <hch@lst.de>
Date: 2017-02-03 14:36:14
Also in:
linux-nvme, lkml
Subsystem:
irq subsystem, the rest · Maintainers:
Thomas Gleixner, Linus Torvalds
This will allow us to spread MSI/MSI-X affinity over all present CPUs and thus better deal with systems where cpus are take on and offline all the time. Signed-off-by: Christoph Hellwig <hch@lst.de> --- kernel/irq/manage.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 6b669593e7eb..7a1424330f9c 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c@@ -354,22 +354,22 @@ static int setup_affinity(struct irq_desc *desc, struct cpumask *mask) /* * Preserve the managed affinity setting and an userspace affinity - * setup, but make sure that one of the targets is online. + * setup, but make sure that one of the targets is present. */ if (irqd_affinity_is_managed(&desc->irq_data) || irqd_has_set(&desc->irq_data, IRQD_AFFINITY_SET)) { if (cpumask_intersects(desc->irq_common_data.affinity, - cpu_online_mask)) + cpu_present_mask)) set = desc->irq_common_data.affinity; else irqd_clear(&desc->irq_data, IRQD_AFFINITY_SET); } - cpumask_and(mask, cpu_online_mask, set); + cpumask_and(mask, cpu_present_mask, set); if (node != NUMA_NO_NODE) { const struct cpumask *nodemask = cpumask_of_node(node); - /* make sure at least one of the cpus in nodemask is online */ + /* make sure at least one of the cpus in nodemask is present */ if (cpumask_intersects(mask, nodemask)) cpumask_and(mask, mask, nodemask); }
--
2.11.0