linux-kernel - [PATCH -next 1/6] cpuset: add assert_cpuset_lock

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20251217084942.2666405-2-chenridong@huaweicloud.com>
Date: Wed, 17 Dec 2025 08:49:37 +0000
From: Chen Ridong <chenridong@...weicloud.com>
To: longman@...hat.com,
	tj@...nel.org,
	hannes@...xchg.org,
	mkoutny@...e.com
Cc: cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	lujialin4@...wei.com,
	chenridong@...weicloud.com
Subject: [PATCH -next 1/6] cpuset: add assert_cpuset_lock_held helper

From: Chen Ridong <chenridong@...wei.com>

Add assert_cpuset_lock_held() to allow other subsystems to verify that
cpuset_mutex is held.

Suggested-by: Waiman Long <longman@...hat.com>
Signed-off-by: Chen Ridong <chenridong@...wei.com>
---
 include/linux/cpuset.h | 2 ++
 kernel/cgroup/cpuset.c | 5 +++++
 2 files changed, 7 insertions(+)

diff --git a/include/linux/cpuset.h b/include/linux/cpuset.h
index a98d3330385c..af0e76d10476 100644
--- a/include/linux/cpuset.h
+++ b/include/linux/cpuset.h
@@ -74,6 +74,7 @@ extern void inc_dl_tasks_cs(struct task_struct *task);
 extern void dec_dl_tasks_cs(struct task_struct *task);
 extern void cpuset_lock(void);
 extern void cpuset_unlock(void);
+extern void assert_cpuset_lock_held(void);
 extern void cpuset_cpus_allowed_locked(struct task_struct *p, struct cpumask *mask);
 extern void cpuset_cpus_allowed(struct task_struct *p, struct cpumask *mask);
 extern bool cpuset_cpus_allowed_fallback(struct task_struct *p);
@@ -195,6 +196,7 @@ static inline void inc_dl_tasks_cs(struct task_struct *task) { }
 static inline void dec_dl_tasks_cs(struct task_struct *task) { }
 static inline void cpuset_lock(void) { }
 static inline void cpuset_unlock(void) { }
+static inline void assert_cpuset_lock_held(void) { }
 
 static inline void cpuset_cpus_allowed_locked(struct task_struct *p,
 					struct cpumask *mask)
diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c
index fea577b4016a..a5ad124ea1cf 100644
--- a/kernel/cgroup/cpuset.c
+++ b/kernel/cgroup/cpuset.c
@@ -271,6 +271,11 @@ void cpuset_unlock(void)
 	mutex_unlock(&cpuset_mutex);
 }
 
+void assert_cpuset_lock_held(void)
+{
+	lockdep_assert_held(&cpuset_mutex);
+}
+
 /**
  * cpuset_full_lock - Acquire full protection for cpuset modification
  *
-- 
2.34.1