[PATCH net 8/8] sched/isolation: Make HK_TYPE_KTHREAD an alias of HK_TYPE_DOMAIN

Pablo Neira Ayuso
2026-05-05T00:17:10Z

From: Waiman Long <longman@redhat.com>

Since commit 041ee6f3727a ("kthread: Rely on HK_TYPE_DOMAIN for preferred
affinity management"), kthreads default to use the HK_TYPE_DOMAIN
cpumask. IOW, it is no longer affected by the setting of the nohz_full
boot kernel parameter.

That means HK_TYPE_KTHREAD should now be an alias of HK_TYPE_DOMAIN
instead of HK_TYPE_KERNEL_NOISE to correctly reflect the current kthread
behavior. Make the change as HK_TYPE_KTHREAD is still being used in
some networking code.

Fixes: 041ee6f3727a ("kthread: Rely on HK_TYPE_DOMAIN for preferred affinity management")
Signed-off-by: Waiman Long <longman@redhat.com>
Signed-off-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
include/linux/sched/isolation.h | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/include/linux/sched/isolation.h b/include/linux/sched/isolation.h
index dc3975ff1b2e..cf0fd03dd7a2 100644
--- a/include/linux/sched/isolation.h
+++ b/include/linux/sched/isolation.h
@@ -20,6 +20,11 @@ enum hk_type {
HK_TYPE_KERNEL_NOISE,
HK_TYPE_MAX,

+ /*
+ * HK_TYPE_KTHREAD is now an alias of HK_TYPE_DOMAIN
+ */
+ HK_TYPE_KTHREAD = HK_TYPE_DOMAIN,
+
/*
* The following housekeeping types are only set by the nohz_full
* boot commandline option. So they can share the same value.
@@ -29,7 +34,6 @@ enum hk_type {
HK_TYPE_RCU = HK_TYPE_KERNEL_NOISE,
HK_TYPE_MISC = HK_TYPE_KERNEL_NOISE,
HK_TYPE_WQ = HK_TYPE_KERNEL_NOISE,
- HK_TYPE_KTHREAD = HK_TYPE_KERNEL_NOISE
};

#ifdef CONFIG_CPU_ISOLATION
--
2.47.3