linux-kernel - Re: [PATCH v2] rcu: Change return type of rcu_spawn_one_boost

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Date:   Mon, 1 Jul 2019 09:01:14 +0900
From:   Byungchul Park <byungchul.park@....com>
To:     "Paul E. McKenney" <paulmck@...ux.ibm.com>
Cc:     Joel Fernandes <joel@...lfernandes.org>, josh@...htriplett.org,
        rostedt@...dmis.org, mathieu.desnoyers@...icios.com,
        jiangshanlai@...il.com, rcu@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-team@....com
Subject: Re: [PATCH v2] rcu: Change return type of
 rcu_spawn_one_boost_kthread()

On Sun, Jun 30, 2019 at 12:38:34PM -0700, Paul E. McKenney wrote:
> On Fri, Jun 28, 2019 at 11:43:39AM +0900, Byungchul Park wrote:
> > On Thu, Jun 27, 2019 at 01:57:03PM -0700, Paul E. McKenney wrote:
> > > On Thu, Jun 27, 2019 at 09:42:40AM -0400, Joel Fernandes wrote:
> > > > On Thu, Jun 27, 2019 at 04:07:46PM +0900, Byungchul Park wrote:
> > > > > Hello,
> > > > > 
> > > > > I tested if the WARN_ON_ONCE() is fired with my box and it was ok.
> > > > 
> > > > Looks pretty safe to me and nice clean up!
> > > > 
> > > > Acked-by: Joel Fernandes (Google) <joel@...lfernandes.org>
> > > 
> > > Agreed, but I still cannot find where this applies.  I did try rcu/next,
> > > which is currently here:
> > > 
> > > commit b989ff070574ad8b8621d866de0a8e9a65d42c80 (rcu/rcu/next, rcu/next)
> > > Merge: 4289ee7d5a83 11ca7a9d541d
> > > Author: Paul E. McKenney <paulmck@...ux.ibm.com>
> > > Date:   Mon Jun 24 09:12:39 2019 -0700
> > > 
> > >     Merge LKMM and RCU commits
> > > 
> > > Help?
> > 
> > commit 204d7a60670f3f6399a4d0826667ab7863b3e429
> > 
> >      Merge LKMM and RCU commits
> > 
> > I made it on top of the above. And could you tell me which branch I'd
> > better use when developing. I think it's been changing sometimes.
> 
> That would be because idiot here took so much care to avoid risking
> pushing some early development commits into the upcoming merge window
> that he managed to misplace them entirely.  The -rcu tree's "dev" branch
> now includes them.  Could you please port to it?

Of course, I can.

> a1af11a24cb0 ("rcu/nocb: Make __call_rcu_nocb_wake() safe for many callbacks")
> 
> > Thank you for the answer in advance!
> 
> And please accept my apologies for the very confusing tree layout this
> time around!

It would be totally OK if you give me the answer when I feel confused
with branch for development. :)

> 
> 							Thanx, Paul