diff options
| author | Pavankumar Kondeti <pkondeti@codeaurora.org> | 2018-12-03 15:05:26 +0530 |
|---|---|---|
| committer | Georg Veichtlbauer <georg@vware.at> | 2023-07-16 12:47:42 +0200 |
| commit | 602bf4096dabb119eb3e176353c4607030fbb1c7 (patch) | |
| tree | 0c78c06af68f2f96467242e9ac575d945fd1df49 /kernel | |
| parent | 9209b5556f6acc6b2c0c29135db247f90a3eb78e (diff) | |
genirq: Honour IRQ's affinity hint during migration
An IRQ affinity is broken during hotplug/isolation when there
are no online and un-isolated CPUs in the current affinity mask.
An online and un-isolated CPU from the irq_default_affinity mask
(i.e /proc/irq/default_smp_affinity) is used as the current
affinity. However Individual IRQs can have their affinity hint
set via irq_set_affinity_hint() API. When such hint is available,
use it instead of the irq_default_affinity which is a system level
setting.
Change-Id: I53a537582ec4e1aed0c59b49f4fd5b6ca7c0c332
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/irq/cpuhotplug.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/kernel/irq/cpuhotplug.c b/kernel/irq/cpuhotplug.c index 4684b7595e63..9fad2dc50452 100644 --- a/kernel/irq/cpuhotplug.c +++ b/kernel/irq/cpuhotplug.c @@ -36,6 +36,10 @@ static bool migrate_one_irq(struct irq_desc *desc) affinity = &available_cpus; if (cpumask_any_and(affinity, cpu_online_mask) >= nr_cpu_ids) { + const struct cpumask *default_affinity; + + default_affinity = desc->affinity_hint ? : irq_default_affinity; + /* * The order of preference for selecting a fallback CPU is * @@ -45,9 +49,9 @@ static bool migrate_one_irq(struct irq_desc *desc) */ cpumask_andnot(&available_cpus, cpu_online_mask, cpu_isolated_mask); - if (cpumask_intersects(&available_cpus, irq_default_affinity)) + if (cpumask_intersects(&available_cpus, default_affinity)) cpumask_and(&available_cpus, &available_cpus, - irq_default_affinity); + default_affinity); else if (cpumask_empty(&available_cpus)) affinity = cpu_online_mask; |