linux-kernel - [PATCH 2/4] rcu/nocb: Fix segcblist state machine stale comments about timers

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Message-ID: <20240425141835.19776-3-frederic@kernel.org>
Date: Thu, 25 Apr 2024 16:18:33 +0200
From: Frederic Weisbecker <frederic@...nel.org>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Frederic Weisbecker <frederic@...nel.org>,
	"Paul E. McKenney" <paulmck@...nel.org>,
	Boqun Feng <boqun.feng@...il.com>,
	Joel Fernandes <joel@...lfernandes.org>,
	Neeraj Upadhyay <neeraj.upadhyay@....com>,
	Uladzislau Rezki <urezki@...il.com>,
	Zqiang <qiang.zhang1211@...il.com>,
	rcu <rcu@...r.kernel.org>
Subject: [PATCH 2/4] rcu/nocb: Fix segcblist state machine stale comments about timers

The (de-)offloading process used to take care about the NOCB timer when
it depended on the per-rdp NOCB locking. However this isn't the case
anymore for a long while. It can now safely be armed and run during the
(de-)offloading process, which doesn't care about it anymore.

Update the comments accordingly.

Signed-off-by: Frederic Weisbecker <frederic@...nel.org>
---
 include/linux/rcu_segcblist.h | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/include/linux/rcu_segcblist.h b/include/linux/rcu_segcblist.h
index 1e5b4ef167ca..8018045989af 100644
--- a/include/linux/rcu_segcblist.h
+++ b/include/linux/rcu_segcblist.h
@@ -80,8 +80,7 @@ struct rcu_cblist {
  *  |       SEGCBLIST_RCU_CORE | SEGCBLIST_LOCKING | SEGCBLIST_OFFLOADED       |
  *  |                                                                          |
  *  | Callbacks processed by rcu_core() from softirqs or local                 |
- *  | rcuc kthread, while holding nocb_lock. Waking up CB and GP kthreads,     |
- *  | allowing nocb_timer to be armed.                                         |
+ *  | rcuc kthread, while holding nocb_lock. Waking up CB and GP kthreads.     |
  *  ----------------------------------------------------------------------------
  *                                         |
  *                                         v
@@ -183,8 +182,7 @@ struct rcu_cblist {
  *  |                SEGCBLIST_RCU_CORE | SEGCBLIST_LOCKING                    |
  *  |                                                                          |
  *  | Callbacks processed by rcu_core() from softirqs or local                 |
- *  | rcuc kthread, while holding nocb_lock. Forbid nocb_timer to be armed.    |
- *  | Flush pending nocb_timer.                                                |
+ *  | rcuc kthread, while holding nocb_lock.                                   |
  *  ----------------------------------------------------------------------------
  *                                      |
  *                                      v
-- 
2.44.0