linux-kernel - [cgroup/for-6.19 PATCH v3 3/5] cgroup/cpuset: Move up prstate_housekeeping

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Message-ID: <20251105043848.382703-4-longman@redhat.com>
Date: Tue,  4 Nov 2025 23:38:46 -0500
From: Waiman Long <longman@...hat.com>
To: Tejun Heo <tj@...nel.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Koutný <mkoutny@...e.com>
Cc: cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Chen Ridong <chenridong@...wei.com>,
	Gabriele Monaco <gmonaco@...hat.com>,
	Frederic Weisbecker <frederic@...nel.org>,
	Waiman Long <longman@...hat.com>
Subject: [cgroup/for-6.19 PATCH v3 3/5] cgroup/cpuset: Move up prstate_housekeeping_conflict() helper

Move up the prstate_housekeeping_conflict() helper so that it can be
used in remote partition code.

Signed-off-by: Waiman Long <longman@...hat.com>
---
 kernel/cgroup/cpuset.c | 40 ++++++++++++++++++++--------------------
 1 file changed, 20 insertions(+), 20 deletions(-)

diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c
index 99622e90991a..cc9c3402f16b 100644
--- a/kernel/cgroup/cpuset.c
+++ b/kernel/cgroup/cpuset.c
@@ -1432,6 +1432,26 @@ static bool isolated_cpus_can_update(struct cpumask *add_cpus,
 	return res;
 }
 
+/*
+ * prstate_housekeeping_conflict - check for partition & housekeeping conflicts
+ * @prstate: partition root state to be checked
+ * @new_cpus: cpu mask
+ * Return: true if there is conflict, false otherwise
+ *
+ * CPUs outside of boot_hk_cpus, if defined, can only be used in an
+ * isolated partition.
+ */
+static bool prstate_housekeeping_conflict(int prstate, struct cpumask *new_cpus)
+{
+	if (!have_boot_isolcpus)
+		return false;
+
+	if ((prstate != PRS_ISOLATED) && !cpumask_subset(new_cpus, boot_hk_cpus))
+		return true;
+
+	return false;
+}
+
 static void update_isolation_cpumasks(bool isolcpus_updated)
 {
 	int ret;
@@ -1727,26 +1747,6 @@ static void remote_cpus_update(struct cpuset *cs, struct cpumask *xcpus,
 	remote_partition_disable(cs, tmp);
 }
 
-/*
- * prstate_housekeeping_conflict - check for partition & housekeeping conflicts
- * @prstate: partition root state to be checked
- * @new_cpus: cpu mask
- * Return: true if there is conflict, false otherwise
- *
- * CPUs outside of boot_hk_cpus, if defined, can only be used in an
- * isolated partition.
- */
-static bool prstate_housekeeping_conflict(int prstate, struct cpumask *new_cpus)
-{
-	if (!have_boot_isolcpus)
-		return false;
-
-	if ((prstate != PRS_ISOLATED) && !cpumask_subset(new_cpus, boot_hk_cpus))
-		return true;
-
-	return false;
-}
-
 /**
  * update_parent_effective_cpumask - update effective_cpus mask of parent cpuset
  * @cs:      The cpuset that requests change in partition root state
-- 
2.51.1