linux-kernel - Re: [PATCH] lockdep: Remove unnecessary acquisitions wrt workqueue flush

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Message-ID: <20170907094109.t5qzs3glfx32l327@hirez.programming.kicks-ass.net>
Date:   Thu, 7 Sep 2017 11:41:09 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Byungchul Park <byungchul.park@....com>
Cc:     tj@...nel.org, johannes.berg@...el.com, mingo@...nel.org,
        tglx@...utronix.de, oleg@...hat.com, david@...morbit.com,
        linux-kernel@...r.kernel.org, kernel-team@....com
Subject: Re: [PATCH] lockdep: Remove unnecessary acquisitions wrt workqueue
 flush

On Thu, Sep 07, 2017 at 09:33:16AM +0900, Byungchul Park wrote:
> Workqueue added manual acquisitions to catch deadlock cases. Now
> crossrelease was introduced, some of those are redundant because
> crossrelease-enabled wait_for_completeion() also does it. Removed it.

This does not explain how it doesn't become the regular timing dependent
stuff cross-release normally is.