linux-kernel - Re: [PATCH -next v3 0/3] rcu/nocb: Cleanup patches for next merge window

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Message-ID: <78a11bfa-4613-450d-bc3c-238e0b44557b@paulmck-laptop>
Date: Wed, 21 Jan 2026 11:41:34 -0800
From: "Paul E. McKenney" <paulmck@...nel.org>
To: Joel Fernandes <joelagnelf@...dia.com>
Cc: linux-kernel@...r.kernel.org, Boqun Feng <boqun.feng@...il.com>,
	rcu@...r.kernel.org, Frederic Weisbecker <frederic@...nel.org>,
	Neeraj Upadhyay <neeraj.upadhyay@...nel.org>,
	Josh Triplett <josh@...htriplett.org>,
	Uladzislau Rezki <urezki@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Lai Jiangshan <jiangshanlai@...il.com>,
	Zqiang <qiang.zhang@...ux.dev>
Subject: Re: [PATCH -next v3 0/3] rcu/nocb: Cleanup patches for next merge
 window

On Wed, Jan 21, 2026 at 02:13:56PM -0500, Joel Fernandes wrote:
> 
> 
> On 1/21/2026 2:09 PM, Paul E. McKenney wrote:
> > On Mon, Jan 19, 2026 at 06:12:20PM -0500, Joel Fernandes wrote:
> >> These are a few nocb related cleanup patches for the next merge window.
> >>
> >> Also Frederic please object to the second patch ("Remove dead callback overload
> >> handling") if you would like, but I think based on our discussion I have
> >> implemented your suggestion, so it should be good.
> >>
> >> Changes from v2:
> >> - Dropped patch 2 "Add warning if no rcuog wake up attempt happened during
> >>   overload" as it was not needed since we removed the dead CB overload handling.
> >> - Replaced "Add warning to detect if overload advancement is ever useful" with
> >>   "Remove dead callback overload handling" per Frederic's feedback - instead of
> >>   adding a warning, just remove the dead code path entirely.
> >>
> >> nocb rcutorture scenarios passed overnight testing on my system.
> > 
> > I reverted three of your earlier patches in order to apply this, only
> > one of which I am really confident in.  Please check my -rcu tree to see
> > if any of the three should be added back in, and I am starting tests in
> > the meantime.Age	Commit message (Expand)	Author	Files	Lines
> 
> Per your latest /dev branch
> (https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git/log/?h=dev),
> you have the latest 3 patches:
> 
> Extract nocb_defer_wakeup_cancel() helperdev	Joel Fernandes	1	-8/+11
> rcu/nocb: Remove dead callback overload handling	Joel Fernandes	1	-12/+0
> rcu/nocb: Remove unnecessary WakeOvfIsDeferred wake path	Joel Fernandes	3	-36/+18

Thank you for checking!

And just to double-check, all of the patches that I reverted are obsolete,
correct?

							Thanx, Paul