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

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Message-ID: <cddea3f4-4041-491c-87f8-0ffba948a3b6@nvidia.com>
Date: Wed, 21 Jan 2026 14:50:54 -0500
From: Joel Fernandes <joelagnelf@...dia.com>
To: paulmck@...nel.org
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 1/21/2026 2:41 PM, Paul E. McKenney wrote:
> 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?

Yes, those patches were from v2. You have correctly applied the latest v3 version.

thanks,
-- 
Joel Fernandes