linux-kernel - Re: single-threaded wq lockdep is broken

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Message-ID: <1496393508.20223.0.camel@sipsolutions.net>
Date:   Fri, 02 Jun 2017 10:51:48 +0200
From:   Johannes Berg <johannes@...solutions.net>
To:     Lai Jiangshan <jiangshanlai@...il.com>
Cc:     Tejun Heo <tj@...nel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: single-threaded wq lockdep is broken

On Fri, 2017-06-02 at 15:03 +0800, Lai Jiangshan wrote:
> 
> the @w2 is not queued before flush_work(&w2), it is expected
> that @w2 is not associated with @wq, and the dependence
> mtx -> wq will not be recorded. And it is expected no warning.

Lockdep is symmetric. So then maybe it won't warn when executing
flush_work(), but should later when executing @w2. No real difference?

johannes