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

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Message-ID: <20170831080758.kludd4sn3zns6imd@hirez.programming.kicks-ass.net>
Date:   Thu, 31 Aug 2017 10:07:58 +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 06:24:39PM +0900, Byungchul Park wrote:
> > And there obviously _should_ not be any dependencies between those. A
> 
> 100% right. Since there obviously should not be any, it would be better
> to check them. So I've endlessly asked you 'do you have any reason removing
> the opportunity for that check?'. Overhead? Logical problem? Or want to
> believe workqueue setup code perfect forever? I mean, is it a problem if we
> check them?

Nothing is perfect. And cross-release less that others. Covering that
case for the first few works really isn't worth it.