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

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Message-Id: <20260119231223.989409-1-joelagnelf@nvidia.com>
Date: Mon, 19 Jan 2026 18:12:20 -0500
From: Joel Fernandes <joelagnelf@...dia.com>
To: linux-kernel@...r.kernel.org
Cc: "Paul E . McKenney" <paulmck@...nel.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>,
	Joel Fernandes <joelagnelf@...dia.com>
Subject: [PATCH -next v3 0/3] rcu/nocb: Cleanup patches for next merge window

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.

Link to v2: https://lore.kernel.org/all/20260114173154.1701056-1-joelagnelf@nvidia.com/
Link to v1: https://lore.kernel.org/all/20260101163417.1065705-1-joelagnelf@nvidia.com/

Joel Fernandes (3):
  rcu/nocb: Remove unnecessary WakeOvfIsDeferred wake path
  rcu/nocb: Remove dead callback overload handling
  rcu/nocb: Extract nocb_defer_wakeup_cancel() helper

 kernel/rcu/tree.c      |  2 +-
 kernel/rcu/tree.h      |  3 +-
 kernel/rcu/tree_nocb.h | 80 ++++++++++++++----------------------------
 3 files changed, 29 insertions(+), 56 deletions(-)

-- 
2.34.1