[PATCH 6.8 002/715] workqueue.c: Increase workqueue name length

Sasha Levin
2024-03-24T22:35:00Z

From: Audra Mitchell <audra@redhat.com>

[ Upstream commit 31c89007285d365aa36f71d8fb0701581c770a27 ]

Currently we limit the size of the workqueue name to 24 characters due to
commit ecf6881ff349 ("workqueue: make workqueue->name[] fixed len")
Increase the size to 32 characters and print a warning in the event
the requested name is larger than the limit of 32 characters.

Signed-off-by: Audra Mitchell <audra@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Stable-dep-of: 5797b1c18919 ("workqueue: Implement system-wide nr_active enforcement for unbound workqueues")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
kernel/workqueue.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 7b482a26d7419..8a06fddb23e66 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -108,7 +108,7 @@ enum {
RESCUER_NICE_LEVEL = MIN_NICE,
HIGHPRI_NICE_LEVEL = MIN_NICE,

- WQ_NAME_LEN = 24,
+ WQ_NAME_LEN = 32,
};

/*
@@ -4666,6 +4666,7 @@ struct workqueue_struct *alloc_workqueue(const char *fmt,
va_list args;
struct workqueue_struct *wq;
struct pool_workqueue *pwq;
+ int len;

/*
* Unbound && max_active == 1 used to imply ordered, which is no longer
@@ -4692,9 +4693,12 @@ struct workqueue_struct *alloc_workqueue(const char *fmt,
}

va_start(args, max_active);
- vsnprintf(wq->name, sizeof(wq->name), fmt, args);
+ len = vsnprintf(wq->name, sizeof(wq->name), fmt, args);
va_end(args);

+ if (len >= WQ_NAME_LEN)
+ pr_warn_once("workqueue: name exceeds WQ_NAME_LEN. Truncating to: %s\n", wq->name);
+
max_active = max_active ?: WQ_DFL_ACTIVE;
max_active = wq_clamp_max_active(max_active, flags, wq->name);

--
2.43.0