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

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Message-ID: <be3df000-915d-4fa1-b7e4-231df1344815@nvidia.com>
Date: Wed, 21 Jan 2026 14:13:56 -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 2:09 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

thanks,
-- 
Joel Fernandes