linux-kernel - Re: [PATCH-wq v3 0/4] workqueue: Enable unbound cpumask update on ordered workqueues

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Message-ID: <ZcGOKNcqfr2t1NC9@slm.duckdns.org>
Date: Mon, 5 Feb 2024 15:40:56 -1000
From: Tejun Heo <tj@...nel.org>
To: Waiman Long <longman@...hat.com>
Cc: Lai Jiangshan <jiangshanlai@...il.com>, linux-kernel@...r.kernel.org,
	Juri Lelli <juri.lelli@...hat.com>,
	Cestmir Kalina <ckalina@...hat.com>,
	Alex Gladkov <agladkov@...hat.com>, Phil Auld <pauld@...hat.com>,
	Costa Shulyupin <cshulyup@...hat.com>
Subject: Re: [PATCH-wq v3 0/4] workqueue: Enable unbound cpumask update on
 ordered workqueues

On Mon, Feb 05, 2024 at 08:24:06PM -0500, Waiman Long wrote:
> 
> On 2/5/24 19:04, Tejun Heo wrote:
> > On Mon, Feb 05, 2024 at 09:53:09AM -1000, Tejun Heo wrote:
> > > On Mon, Feb 05, 2024 at 02:45:58PM -0500, Waiman Long wrote:
> > > >   v3:
> > > >    - [v2] https://lore.kernel.org/lkml/20240203154334.791910-1-longman@redhat.com/
> > > >    - Drop patch 1 as it has been merged into the for-6.9 branch.
> > > >    - Use rcu_access_pointer() to access wq->dfl_pwq.
> > > >    - Use RCU protection instead of acquiring wq->mutex in
> > > >      apply_wqattrs_cleanup().
> > > Looks like we raced each other. I'll wait for v4.
> > BTW, please don't bother to handle __WQ_ORDERED being cleared. We are very
> > close to removing the implicit ORDERED promotion, so we should be able to
> > apply the patch to remove the distinction between explicitly and implicitly
> > ordered workqueues.
> 
> BTW, the workqueue.c file in your latest for-6.9 branch still has a
> reference to __WQ_ORDERED_EXPLICIT in workqueue_apply_unbound_cpumask().
> Will that break compilation?

Right you are. Will post a followup patch.

Thanks.

-- 
tejun