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From: Bart Van Assche <bvanassche@acm.org>
To: Tejun Heo <tj@kernel.org>
Cc: linux-kernel@vger.kernel.org,
	Johannes Berg <johannes.berg@intel.com>,
	Christoph Hellwig <hch@lst.de>, Sagi Grimberg <sagi@grimberg.me>,
	tytso@mit.edu, bvanassche@acm.org
Subject: [PATCH 2/3] kernel/workqueue: Surround work execution with shared lock annotations
Date: Thu, 25 Oct 2018 08:05:39 -0700	[thread overview]
Message-ID: <20181025150540.259281-3-bvanassche@acm.org> (raw)
In-Reply-To: <20181025150540.259281-1-bvanassche@acm.org>

Surround execution of work with a shared lockdep annotation because multiple
work items associated with a work queue may execute concurrently.

Cc: Johannes Berg <johannes.berg@intel.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---
 kernel/workqueue.c | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 6755ef21a679..fc9129d5909e 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -2125,8 +2125,8 @@ __acquires(&pool->lock)
 
 	spin_unlock_irq(&pool->lock);
 
-	lock_map_acquire(&pwq->wq->lockdep_map);
-	lock_map_acquire(&lockdep_map);
+	lock_acquire_shared(&pwq->wq->lockdep_map, 0, 0, NULL, _THIS_IP_);
+	lock_acquire_shared(&lockdep_map, 0, 0, NULL, _THIS_IP_);
 	/*
 	 * Strictly speaking we should mark the invariant state without holding
 	 * any locks, that is, before these two lock_map_acquire()'s.
@@ -2156,8 +2156,8 @@ __acquires(&pool->lock)
 	 * point will only record its address.
 	 */
 	trace_workqueue_execute_end(work);
-	lock_map_release(&lockdep_map);
-	lock_map_release(&pwq->wq->lockdep_map);
+	lock_release(&lockdep_map, 0, _THIS_IP_);
+	lock_release(&pwq->wq->lockdep_map, 0, _THIS_IP_);
 
 	if (unlikely(in_atomic() || lockdep_depth(current) > 0)) {
 		pr_err("BUG: workqueue leaked lock or atomic: %s/0x%08x/%d\n"
@@ -2652,8 +2652,8 @@ void flush_workqueue(struct workqueue_struct *wq)
 	if (WARN_ON(!wq_online))
 		return;
 
-	lock_map_acquire(&wq->lockdep_map);
-	lock_map_release(&wq->lockdep_map);
+	lock_acquire_exclusive(&wq->lockdep_map, 0, 0, NULL, _THIS_IP_);
+	lock_release(&wq->lockdep_map, 0, _THIS_IP_);
 
 	mutex_lock(&wq->mutex);
 
@@ -2891,8 +2891,9 @@ static bool start_flush_work(struct work_struct *work, struct wq_barrier *barr,
 	 */
 	if (!from_cancel &&
 	    (pwq->wq->saved_max_active == 1 || pwq->wq->rescuer)) {
-		lock_map_acquire(&pwq->wq->lockdep_map);
-		lock_map_release(&pwq->wq->lockdep_map);
+		lock_acquire_exclusive(&pwq->wq->lockdep_map, 0, 0, NULL,
+				       _THIS_IP_);
+		lock_release(&pwq->wq->lockdep_map, 0, _THIS_IP_);
 	}
 
 	return true;
-- 
2.19.1.568.g152ad8e336-goog


  parent reply	other threads:[~2018-10-25 15:07 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-25 15:05 [PATCH 0/3] Suppress false positives triggered by workqueue lockdep annotations Bart Van Assche
2018-10-25 15:05 ` [PATCH 1/3] kernel/workqueue: Remove lockdep annotation from __flush_work() Bart Van Assche
2018-10-25 15:31   ` Johannes Berg
2018-10-25 15:57     ` Johannes Berg
2018-10-25 16:01     ` Bart Van Assche
2018-10-25 15:05 ` Bart Van Assche [this message]
2018-10-25 16:53   ` [PATCH 2/3] kernel/workqueue: Surround work execution with shared lock annotations Johannes Berg
2018-10-25 17:22     ` Bart Van Assche
2018-10-25 19:17       ` Johannes Berg
2018-10-25 15:05 ` [PATCH 3/3] kernel/workqueue: Suppress a false positive lockdep complaint Bart Van Assche
2018-10-25 15:34   ` Johannes Berg
2018-10-25 15:55     ` Bart Van Assche
2018-10-25 19:59       ` Johannes Berg
2018-10-25 20:21         ` Theodore Y. Ts'o
2018-10-25 20:26           ` Johannes Berg
2018-10-25 15:36   ` Tejun Heo
2018-10-25 15:37     ` Tejun Heo
2018-10-25 20:13     ` Johannes Berg
2018-10-25 15:40   ` Theodore Y. Ts'o
2018-10-25 17:02   ` Johannes Berg
2018-10-25 17:11     ` Bart Van Assche
2018-10-25 19:51       ` Johannes Berg
2018-10-25 20:39         ` Bart Van Assche
2018-10-25 20:47           ` Johannes Berg
2018-10-25 15:27 ` [PATCH 0/3] Suppress false positives triggered by workqueue lockdep annotations Johannes Berg
2018-10-25 15:47   ` Bart Van Assche

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