linux-kernel - Re: [PATCH 4/4] lockdep: Fix workqueue crossrelease annotation

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Message-ID: <20170831080442.5vdgoaijzmrc776x@hirez.programming.kicks-ass.net>
Date:   Thu, 31 Aug 2017 10:04:42 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Byungchul Park <byungchul.park@....com>
Cc:     mingo@...nel.org, tj@...nel.org, boqun.feng@...il.com,
        david@...morbit.com, johannes@...solutions.net, oleg@...hat.com,
        linux-kernel@...r.kernel.org, kernel-team@....com
Subject: Re: [PATCH 4/4] lockdep: Fix workqueue crossrelease annotation

On Wed, Aug 30, 2017 at 08:25:46PM +0900, Byungchul Park wrote:

> For example - I'm giving you the same example repeatedly:
> 
> context X                 context Y
> ---------                 ---------
>                           wait_for_completion(C)
> acquire(A)
> process_one_work()
>    acquire(B)
>    work->fn()
>       complete(C)
> 
> Please check C->A and C->B.

Is there a caller of procesS_one_work() that holds a lock?