Commit 241fc640 authored by Prarit Bhargava's avatar Prarit Bhargava Committed by Thomas Gleixner
Browse files

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: default avatarPrarit Bhargava <prarit@redhat.com>
Acked-by: default avatarNeil 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: default avatarThomas Gleixner <tglx@linutronix.de>
parent f3f79e38

kernel/irq/manage.c

+8 −1
Original line number Diff line number Diff line
@@ -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: