linux-kernel - [PATCH 04/12] workqueue: Protect lockdep functions with #ifdef

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Message-Id: <20220208194324.85333-5-namhyung@kernel.org>
Date:   Tue,  8 Feb 2022 11:43:16 -0800
From:   Namhyung Kim <namhyung@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>, Will Deacon <will@...nel.org>,
        Waiman Long <longman@...hat.com>,
        Boqun Feng <boqun.feng@...il.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Steven Rostedt <rostedt@...dmis.org>,
        Byungchul Park <byungchul.park@....com>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Radoslaw Burny <rburny@...gle.com>, Tejun Heo <tj@...nel.org>,
        Lai Jiangshan <jiangshanlai@...il.com>
Subject: [PATCH 04/12] workqueue: Protect lockdep functions with #ifdef

With upcoming lock tracepoints config, it'd define some of lockdep
functions without enabling CONFIG_LOCKDEP actually.  The existing code
assumes those functions will be removed by the preprocessor but it's
not the case anymore.  Let's protect the code with #ifdef's explicitly.

Cc: Tejun Heo <tj@...nel.org>
Cc: Lai Jiangshan <jiangshanlai@...il.com>
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 kernel/workqueue.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 33f1106b4f99..405e27385f74 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -2279,8 +2279,11 @@ __acquires(&pool->lock)
 
 	raw_spin_unlock_irq(&pool->lock);
 
+#ifdef CONFIG_LOCKDEP
 	lock_map_acquire(&pwq->wq->lockdep_map);
 	lock_map_acquire(&lockdep_map);
+#endif
+
 	/*
 	 * Strictly speaking we should mark the invariant state without holding
 	 * any locks, that is, before these two lock_map_acquire()'s.
@@ -2310,8 +2313,11 @@ __acquires(&pool->lock)
 	 * point will only record its address.
 	 */
 	trace_workqueue_execute_end(work, worker->current_func);
+
+#ifdef CONFIG_LOCKDEP
 	lock_map_release(&lockdep_map);
 	lock_map_release(&pwq->wq->lockdep_map);
+#endif
 
 	if (unlikely(in_atomic() || lockdep_depth(current) > 0)) {
 		pr_err("BUG: workqueue leaked lock or atomic: %s/0x%08x/%d\n"
@@ -2824,8 +2830,10 @@ void flush_workqueue(struct workqueue_struct *wq)
 	if (WARN_ON(!wq_online))
 		return;
 
+#ifdef CONFIG_LOCKDEP
 	lock_map_acquire(&wq->lockdep_map);
 	lock_map_release(&wq->lockdep_map);
+#endif
 
 	mutex_lock(&wq->mutex);
 
@@ -3052,6 +3060,7 @@ static bool start_flush_work(struct work_struct *work, struct wq_barrier *barr,
 	insert_wq_barrier(pwq, barr, work, worker);
 	raw_spin_unlock_irq(&pool->lock);
 
+#ifdef CONFIG_LOCKDEP
 	/*
 	 * Force a lock recursion deadlock when using flush_work() inside a
 	 * single-threaded or rescuer equipped workqueue.
@@ -3066,6 +3075,8 @@ static bool start_flush_work(struct work_struct *work, struct wq_barrier *barr,
 		lock_map_acquire(&pwq->wq->lockdep_map);
 		lock_map_release(&pwq->wq->lockdep_map);
 	}
+#endif
+
 	rcu_read_unlock();
 	return true;
 already_gone:
@@ -3084,10 +3095,12 @@ static bool __flush_work(struct work_struct *work, bool from_cancel)
 	if (WARN_ON(!work->func))
 		return false;
 
+#ifdef CONFIG_LOCKDEP
 	if (!from_cancel) {
 		lock_map_acquire(&work->lockdep_map);
 		lock_map_release(&work->lockdep_map);
 	}
+#endif
 
 	if (start_flush_work(work, &barr, from_cancel)) {
 		wait_for_completion(&barr.done);
-- 
2.35.0.263.gb82422642f-goog