linux-kernel - [PATCH -next v2 0/4] rcu/nocb: Cleanup patches for next merge window

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Message-Id: <20260114173154.1701056-1-joelagnelf@nvidia.com>
Date: Wed, 14 Jan 2026 12:31:50 -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 v2 0/4] rcu/nocb: Cleanup patches for next merge window

These are few nocb related cleanup patches for the next merge window that I am
resending. The fourth patch is trivial extraction of duplicate code for canceling
deferred wakeups.

I did not hear back about opinions on "Add warning to detect if overload
advancement is ever useful" [1] so I will hold off on deleting that code path till
the next merge window (for now the patch is just adding a warning).

Changes from v1:
- Added patch 4 to extract nocb_defer_wakeup_cancel() helper
- Add Frederic's review talk to "Remove unnecessary WakeOvfIsDeferred wake path"

nocb rcutorture scenarios passed overnight testing on my system.

The git tree with all patches can be found at:
git://git.kernel.org/pub/scm/linux/kernel/git/jfern/linux.git (tag: rcu-nocb-v2-20260114)

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

[1] https://lore.kernel.org/all/654e3bde-764b-49ae-8faa-bab8199b1f15@nvidia.com/#t

Joel Fernandes (4):
  rcu/nocb: Remove unnecessary WakeOvfIsDeferred wake path
  rcu/nocb: Add warning if no rcuog wake up attempt happened during
    overload
  rcu/nocb: Add warning to detect if overload advancement is ever useful
  rcu/nocb: Extract nocb_defer_wakeup_cancel() helper

 kernel/rcu/tree.c      |  6 ++-
 kernel/rcu/tree.h      |  4 +-
 kernel/rcu/tree_nocb.h | 91 +++++++++++++++++++++++-------------------
 3 files changed, 56 insertions(+), 45 deletions(-)

-- 
2.34.1