From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S1752119AbdIAQjA (ORCPT <rfc822;w@1wt.eu>);
        Fri, 1 Sep 2017 12:39:00 -0400
Received: from bombadil.infradead.org ([65.50.211.133]:40792 "EHLO
        bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S1751998AbdIAQi7 (ORCPT
        <rfc822;linux-kernel@vger.kernel.org>);
        Fri, 1 Sep 2017 12:38:59 -0400
Date: Fri, 1 Sep 2017 18:38:52 +0200
From: Peter Zijlstra <peterz@infradead.org>
To: Byungchul Park <max.byungchul.park@gmail.com>
Cc: Byungchul Park <byungchul.park@lge.com>,
        Ingo Molnar <mingo@kernel.org>, Tejun Heo <tj@kernel.org>,
        Boqun Feng <boqun.feng@gmail.com>, david@fromorbit.com,
        Johannes Berg <johannes@sipsolutions.net>, oleg@redhat.com,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        kernel-team@lge.com
Subject: Re: [PATCH 4/4] lockdep: Fix workqueue crossrelease annotation
Message-ID: <20170901163852.ckslrgldsalqmg3c@hirez.programming.kicks-ass.net>
References: <004701d32171$ce57d4c0$6b077e40$@lge.com>
 <20170830112546.GH3240@X58A-UD3R>
 <20170831080442.5vdgoaijzmrc776x@hirez.programming.kicks-ass.net>
 <20170831081501.GJ3240@X58A-UD3R>
 <20170831083453.5tfjofzk7idthsof@hirez.programming.kicks-ass.net>
 <20170901020512.GK3240@X58A-UD3R>
 <20170901094747.iv6s532ccuuzpry2@hirez.programming.kicks-ass.net>
 <20170901101629.GL3240@X58A-UD3R>
 <20170901123856.p2trpebau57yxftc@hirez.programming.kicks-ass.net>
 <CANrsvRMc4QXnRFpYY1m7X+WU52WrC7HvvhbvAUqTWQTx2Py6bQ@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <CANrsvRMc4QXnRFpYY1m7X+WU52WrC7HvvhbvAUqTWQTx2Py6bQ@mail.gmail.com>
User-Agent: NeoMutt/20170609 (1.8.3)
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Fri, Sep 01, 2017 at 10:51:48PM +0900, Byungchul Park wrote:
> On Fri, Sep 1, 2017 at 9:38 PM, Peter Zijlstra <peterz@infradead.org> wrote:
> > On Fri, Sep 01, 2017 at 07:16:29PM +0900, Byungchul Park wrote:
> >
> >> It would be gone _only_ at the time the history overrun, and then it
> >> will be built again. So, you are wrong.
> 
> s/it will be built again/the acquisition will be added into the xhlock
> array again/
> 
> Now, better to understand?

No, I still don't get it. How are we ever going to get the workqueue
thread setup code back after its spooled out?

> > How will it ever be build again? You only ever spawn the worker thread
> > _ONCE_, then it runs lots and lots of works.
> >
> > We _could_ go fix it, but I really don't see it being worth the time and
> 
> We don't need to fix it spending time and effort. Just *revert* all your
> wrong patches.

And get tangled up with the workqueue annotation again, no thanks.
Having the first few works see the thread setup isn't worth it.

And your work_id annotation had the same problem.