From: Joel Fernandes <joel@joelfernandes.org>
To: LKML <linux-kernel@vger.kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Jonathan Corbet <corbet@lwn.net>,
Josh Triplett <josh@joshtriplett.org>,
Lai Jiangshan <jiangshanlai@gmail.com>,
"open list:DOCUMENTATION" <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 <rcu@vger.kernel.org>, Steven Rostedt <rostedt@goodmis.org>,
Tejun Heo <tj@kernel.org>
Subject: Re: [PATCH 1/3] workqueue: Convert for_each_wq to use built-in list check (v2)
Date: Sun, 11 Aug 2019 18:12:32 -0400 [thread overview]
Message-ID: <CAEXW_YT8AE3A25ZJhFd3N5dJhFUb0nRDUvwupPq=7QQFw7_KQA@mail.gmail.com> (raw)
In-Reply-To: <20190811221111.99401-1-joel@joelfernandes.org>
On Sun, Aug 11, 2019 at 6:11 PM Joel Fernandes (Google)
<joel@joelfernandes.org> wrote:
>
> 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>
Tejun,
Could you please Ack this patch? I have resent it here.
Thank you,
- Joel
> ---
> 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 prev parent reply other threads:[~2019-08-11 22:12 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-11 22:11 [PATCH 1/3] workqueue: Convert for_each_wq to use built-in list check (v2) Joel Fernandes (Google)
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 ` Joel Fernandes [this message]
2019-08-14 19:48 ` [PATCH 1/3] workqueue: Convert for_each_wq to use built-in list check (v2) Tejun Heo
2019-08-14 22:42 ` Joel Fernandes
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