From: "Joel Fernandes (Google)" <joel@joelfernandes.org>
To: linux-kernel@vger.kernel.org
Cc: "Joel Fernandes (Google)" <joel@joelfernandes.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Jonathan Corbet <corbet@lwn.net>,
Josh Triplett <josh@joshtriplett.org>,
Lai Jiangshan <jiangshanlai@gmail.com>,
linux-doc@vger.kernel.org,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
"Paul E. McKenney" <paulmck@linux.ibm.com>,
"Rafael J. Wysocki" <rafael@kernel.org>,
rcu@vger.kernel.org, Steven Rostedt <rostedt@goodmis.org>,
Tejun Heo <tj@kernel.org>
Subject: [PATCH 1/3] workqueue: Convert for_each_wq to use built-in list check (v2)
Date: Sun, 11 Aug 2019 18:11:09 -0400 [thread overview]
Message-ID: <20190811221111.99401-1-joel@joelfernandes.org> (raw)
list_for_each_entry_rcu now has support to check for RCU reader sections
as well as lock. Just use the support in it, instead of explicitly
checking in the caller.
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
---
kernel/workqueue.c | 10 ++--------
1 file changed, 2 insertions(+), 8 deletions(-)
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 601d61150b65..e882477ebf6e 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -364,11 +364,6 @@ static void workqueue_sysfs_unregister(struct workqueue_struct *wq);
!lockdep_is_held(&wq_pool_mutex), \
"RCU or wq_pool_mutex should be held")
-#define assert_rcu_or_wq_mutex(wq) \
- RCU_LOCKDEP_WARN(!rcu_read_lock_held() && \
- !lockdep_is_held(&wq->mutex), \
- "RCU or wq->mutex should be held")
-
#define assert_rcu_or_wq_mutex_or_pool_mutex(wq) \
RCU_LOCKDEP_WARN(!rcu_read_lock_held() && \
!lockdep_is_held(&wq->mutex) && \
@@ -425,9 +420,8 @@ static void workqueue_sysfs_unregister(struct workqueue_struct *wq);
* ignored.
*/
#define for_each_pwq(pwq, wq) \
- list_for_each_entry_rcu((pwq), &(wq)->pwqs, pwqs_node) \
- if (({ assert_rcu_or_wq_mutex(wq); false; })) { } \
- else
+ list_for_each_entry_rcu((pwq), &(wq)->pwqs, pwqs_node, \
+ lock_is_held(&(wq->mutex).dep_map))
#ifdef CONFIG_DEBUG_OBJECTS_WORK
--
2.23.0.rc1.153.gdeed80330f-goog
next reply other threads:[~2019-08-11 22:11 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-11 22:11 Joel Fernandes (Google) [this message]
2019-08-11 22:11 ` [PATCH 2/3] doc: Update documentation about list_for_each_entry_rcu (v1) Joel Fernandes (Google)
2019-08-12 20:22 ` Paul E. McKenney
2019-08-12 20:42 ` Joel Fernandes
2019-08-12 21:24 ` Paul E. McKenney
2019-08-11 22:11 ` [PATCH 3/3] driver/core: Fix build error when SRCU and lockdep disabled Joel Fernandes (Google)
2019-08-12 5:02 ` Greg Kroah-Hartman
2019-08-12 13:03 ` Joel Fernandes
2019-08-12 18:11 ` Steven Rostedt
2019-08-12 20:01 ` Joel Fernandes
2019-08-12 20:05 ` Steven Rostedt
2019-08-11 22:12 ` [PATCH 1/3] workqueue: Convert for_each_wq to use built-in list check (v2) Joel Fernandes
2019-08-14 19:48 ` Tejun Heo
2019-08-14 22:42 ` Joel Fernandes
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