[PATCH v2 -next 06/11] cgroup/cpuset: add callback_lock helper

Chen Ridong
2024-08-26T13:34:54Z

To modify cpuset, both cpuset_mutex and callback_lock are needed. Add
helpers for cpuset-v1 to get callback_lock.

Signed-off-by: Chen Ridong <chenridong@huawei.com>
---
kernel/cgroup/cpuset-internal.h | 2 ++
kernel/cgroup/cpuset.c | 10 ++++++++++
2 files changed, 12 insertions(+)

diff --git a/kernel/cgroup/cpuset-internal.h b/kernel/cgroup/cpuset-internal.h
index 02c4b0c74fa9..9a60dd6681e4 100644
--- a/kernel/cgroup/cpuset-internal.h
+++ b/kernel/cgroup/cpuset-internal.h
@@ -239,6 +239,8 @@ static inline int is_spread_slab(const struct cpuset *cs)
}

void rebuild_sched_domains_locked(void);
+void callback_lock_irq(void);
+void callback_unlock_irq(void);

/*
* cpuset-v1.c
diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c
index 0a3347e4dddc..2b2dc963299b 100644
--- a/kernel/cgroup/cpuset.c
+++ b/kernel/cgroup/cpuset.c
@@ -269,6 +269,16 @@ void cpuset_unlock(void)

static DEFINE_SPINLOCK(callback_lock);

+void callback_lock_irq(void)
+{
+ spin_lock_irq(&callback_lock);
+}
+
+void callback_unlock_irq(void)
+{
+ spin_unlock_irq(&callback_lock);
+}
+
static struct workqueue_struct *cpuset_migrate_mm_wq;

static DECLARE_WAIT_QUEUE_HEAD(cpuset_attach_wq);
--
2.34.1