linux-kernel - Re: linux-next: manual merge of the workqueues tree with the tip tree

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Message-ID: <20191118145607.GI2889@paulmck-ThinkPad-P72>
Date:   Mon, 18 Nov 2019 06:56:07 -0800
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Tejun Heo <tj@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "Joel Fernandes (Google)" <joel@...lfernandes.org>
Subject: Re: linux-next: manual merge of the workqueues tree with the tip tree

On Mon, Nov 18, 2019 at 01:50:46PM +0100, Ingo Molnar wrote:
> 
> * Sebastian Andrzej Siewior <bigeasy@...utronix.de> wrote:
> 
> > On 2019-11-18 15:08:58 [+1100], Stephen Rothwell wrote:
> > > Hi all,
> > Hi,
> > 
> > > Today's linux-next merge of the workqueues tree got a conflict in:
> > > 
> > >   kernel/workqueue.c
> > > 
> > > between commit:
> > > 
> > >   5a6446626d7e ("workqueue: Convert for_each_wq to use built-in list check")
> > > 
> > > from the tip tree and commit:
> > > 
> > >   49e9d1a9faf2 ("workqueue: Add RCU annotation for pwq list walk")
> > > 
> > > from the workqueues tree.
> > 
> > urgh. So the RCU warning is introduced in commit
> >    28875945ba98d ("rcu: Add support for consolidated-RCU reader checking")
> > 
> > which was merged in v5.4-rc1. I enabled it around -rc7 and saw a few
> > warnings including in the workqueue code. I asked about this and posted
> > later a patch which was applied by Tejun. Now I see that the tip tree
> > has a patch for this warning…
> > I would vote for the patch in -tip since it also removes the
> > assert_rcu_or_wq_mutex() macro.
> > It would be nice if this could be part of v5.4 since once the RCU
> > warning is enabled it will yell.
> 
> So 5a6446626d7e is currently queued up for v5.5 as part of the RCU tree. 
> 
> I can cherry pick 5a6446626d7e into tip:core/urgent if Paul and Tejun 
> agree.

No objections here.

							Thanx, Paul