linux-kernel - [PATCH rcu 4/7] srcu: Point call_srcu() to call

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Message-Id: <20250218054547.7364-5-boqun.feng@gmail.com>
Date: Mon, 17 Feb 2025 21:45:44 -0800
From: Boqun Feng <boqun.feng@...il.com>
To: rcu@...r.kernel.org
Cc: "Paul E. McKenney" <paulmck@...nel.org>,
	Frederic Weisbecker <frederic@...nel.org>,
	Neeraj Upadhyay <neeraj.upadhyay@...nel.org>,
	Joel Fernandes <joel@...lfernandes.org>,
	Josh Triplett <josh@...htriplett.org>,
	Boqun Feng <boqun.feng@...il.com>,
	Uladzislau Rezki <urezki@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Lai Jiangshan <jiangshanlai@...il.com>,
	Zqiang <qiang.zhang1211@...il.com>,
	Jonathan Corbet <corbet@....net>,
	linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH rcu 4/7] srcu: Point call_srcu() to call_rcu() for detailed memory ordering

From: "Paul E. McKenney" <paulmck@...nel.org>

This commit causes the call_srcu() kernel-doc header to reference that
of call_rcu() for detailed memory-ordering guarantees.

Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
Signed-off-by: Boqun Feng <boqun.feng@...il.com>
---
 kernel/rcu/srcutree.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/kernel/rcu/srcutree.c b/kernel/rcu/srcutree.c
index b83c74c4dcc0..f87a9fb6d6bb 100644
--- a/kernel/rcu/srcutree.c
+++ b/kernel/rcu/srcutree.c
@@ -1398,8 +1398,12 @@ static void __call_srcu(struct srcu_struct *ssp, struct rcu_head *rhp,
  * read-side critical sections are delimited by srcu_read_lock() and
  * srcu_read_unlock(), and may be nested.
  *
- * The callback will be invoked from process context, but must nevertheless
- * be fast and must not block.
+ * The callback will be invoked from process context, but with bh
+ * disabled.  The callback function must therefore be fast and must
+ * not block.
+ *
+ * See the description of call_rcu() for more detailed information on
+ * memory ordering guarantees.
  */
 void call_srcu(struct srcu_struct *ssp, struct rcu_head *rhp,
 	       rcu_callback_t func)
-- 
2.39.5 (Apple Git-154)