From: Johannes Berg <johannes@sipsolutions.net>
To: Bart Van Assche <bvanassche@acm.org>, Tejun Heo <tj@kernel.org>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Christoph Hellwig <hch@lst.de>, Sagi Grimberg <sagi@grimberg.me>,
"tytso@mit.edu" <tytso@mit.edu>
Subject: Re: [PATCH 1/3] kernel/workqueue: Remove lockdep annotation from __flush_work()
Date: Thu, 25 Oct 2018 17:57:22 +0200 [thread overview]
Message-ID: <61f01315bbbec872d4173ca4a89ba0268d199aa3.camel@sipsolutions.net> (raw)
In-Reply-To: <986cb39001ee9eb11dd546b79de9e0b4b8463d19.camel@sipsolutions.net>
On Thu, 2018-10-25 at 17:31 +0200, Johannes Berg wrote:
> On Thu, 2018-10-25 at 15:05 +0000, Bart Van Assche wrote:
> > As documented in a comment in start_flush_work(), calling flush_work()
> > from a multi-threaded workqueue is safe if that workqueue is not
> > equipped with a rescuer. Avoid that flush_work() calls from inside a
> > work item executing on such a queue trigger a lockdep complaint.
So actually, come to think of it, certainly this will cause a false
negative in this case?
mutex_lock(A);
flush_work(W);
worker_W_function()
{
mutex_lock(A);
}
right?
johannes
next prev parent reply other threads:[~2018-10-25 15:57 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 [this message]
2018-10-25 16:01 ` Bart Van Assche
2018-10-25 15:05 ` [PATCH 2/3] kernel/workqueue: Surround work execution with shared lock annotations Bart Van Assche
2018-10-25 16:53 ` 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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