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authorPrarit Bhargava <prarit@redhat.com>2012-03-26 15:02:18 -0400
committerThomas Gleixner <tglx@linutronix.de>2012-03-29 11:31:53 +0200
commit241fc640be783f903e74b6d9c68481c01873f758 (patch)
tree253793b9f94721554c3aa2b286ca27052b3390e8 /kernel/irq
parentf3f79e38d51f8a419f4c484a86ece4baea35b993 (diff)
genirq: Respect NUMA node affinity in setup_irq_irq affinity()
We respect node affinity of devices already in the irq descriptor allocation, but we ignore it for the initial interrupt affinity setup, so the interrupt might be routed to a different node. Restrict the default affinity mask to the node on which the irq descriptor is allocated. [ tglx: Massaged changelog ] Signed-off-by: Prarit Bhargava <prarit@redhat.com> Acked-by: Neil Horman <nhorman@tuxdriver.com> Cc: Yinghai Lu <yinghai@kernel.org> Cc: David Rientjes <rientjes@google.com> Link: http://lkml.kernel.org/r/1332788538-17425-1-git-send-email-prarit@redhat.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/irq')
-rw-r--r--kernel/irq/manage.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index bf606a53a21..89a3ea82569 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -282,7 +282,7 @@ setup_affinity(unsigned int irq, struct irq_desc *desc, struct cpumask *mask)
{
struct irq_chip *chip = irq_desc_get_chip(desc);
struct cpumask *set = irq_default_affinity;
- int ret;
+ int ret, node = desc->irq_data.node;
/* Excludes PER_CPU and NO_BALANCE interrupts */
if (!irq_can_set_affinity(irq))
@@ -301,6 +301,13 @@ setup_affinity(unsigned int irq, struct irq_desc *desc, struct cpumask *mask)
}
cpumask_and(mask, cpu_online_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 */
+ if (cpumask_intersects(mask, nodemask))
+ cpumask_and(mask, mask, nodemask);
+ }
ret = chip->irq_set_affinity(&desc->irq_data, mask, false);
switch (ret) {
case IRQ_SET_MASK_OK: