linux-kernel - [PATCH v2 1/5] workqueue: Split alloc_workqueue into internal function and lockdep init

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Message-Id: <20240731003119.2422940-2-matthew.brost@intel.com>
Date: Tue, 30 Jul 2024 17:31:15 -0700
From: Matthew Brost <matthew.brost@...el.com>
To: intel-xe@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Cc: tj@...nel.org,
	jiangshanlai@...il.com,
	christian.koenig@....com,
	ltuikov89@...il.com,
	daniel@...ll.ch
Subject: [PATCH v2 1/5] workqueue: Split alloc_workqueue into internal function and lockdep init

Will help enable user-defined lockdep maps for workqueues.

Cc: Tejun Heo <tj@...nel.org>
Cc: Lai Jiangshan <jiangshanlai@...il.com>
Signed-off-by: Matthew Brost <matthew.brost@...el.com>
---
 kernel/workqueue.c | 31 +++++++++++++++++++++++--------
 1 file changed, 23 insertions(+), 8 deletions(-)

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 3fbaecfc88c2..c9bdd6a23a2b 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -5657,9 +5657,9 @@ static void wq_adjust_max_active(struct workqueue_struct *wq)
 }
 
 __printf(1, 4)
-struct workqueue_struct *alloc_workqueue(const char *fmt,
-					 unsigned int flags,
-					 int max_active, ...)
+static struct workqueue_struct *__alloc_workqueue(const char *fmt,
+						  unsigned int flags,
+						  int max_active, ...)
 {
 	va_list args;
 	struct workqueue_struct *wq;
@@ -5725,12 +5725,11 @@ struct workqueue_struct *alloc_workqueue(const char *fmt,
 	INIT_LIST_HEAD(&wq->flusher_overflow);
 	INIT_LIST_HEAD(&wq->maydays);
 
-	wq_init_lockdep(wq);
 	INIT_LIST_HEAD(&wq->list);
 
 	if (flags & WQ_UNBOUND) {
 		if (alloc_node_nr_active(wq->node_nr_active) < 0)
-			goto err_unreg_lockdep;
+			goto err_free_wq;
 	}
 
 	if (alloc_and_link_pwqs(wq) < 0)
@@ -5762,9 +5761,6 @@ struct workqueue_struct *alloc_workqueue(const char *fmt,
 err_free_node_nr_active:
 	if (wq->flags & WQ_UNBOUND)
 		free_node_nr_active(wq->node_nr_active);
-err_unreg_lockdep:
-	wq_unregister_lockdep(wq);
-	wq_free_lockdep(wq);
 err_free_wq:
 	free_workqueue_attrs(wq->unbound_attrs);
 	kfree(wq);
@@ -5773,6 +5769,25 @@ struct workqueue_struct *alloc_workqueue(const char *fmt,
 	destroy_workqueue(wq);
 	return NULL;
 }
+
+__printf(1, 4)
+struct workqueue_struct *alloc_workqueue(const char *fmt,
+					 unsigned int flags,
+					 int max_active, ...)
+{
+	struct workqueue_struct *wq;
+	va_list args;
+
+	va_start(args, max_active);
+	wq = __alloc_workqueue(fmt, flags, max_active, args);
+	va_end(args);
+	if (!wq)
+		return NULL;
+
+	wq_init_lockdep(wq);
+
+	return wq;
+}
 EXPORT_SYMBOL_GPL(alloc_workqueue);
 
 static bool pwq_busy(struct pool_workqueue *pwq)
-- 
2.34.1