linux-kernel - [PATCH 16/16] srcu: Improve srcu_read_lock

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Message-ID: <20241112145159.23032-17-frederic@kernel.org>
Date: Tue, 12 Nov 2024 15:51:59 +0100
From: Frederic Weisbecker <frederic@...nel.org>
To: LKML <linux-kernel@...r.kernel.org>
Cc: "Paul E. McKenney" <paulmck@...nel.org>,
	Boqun Feng <boqun.feng@...il.com>,
	Joel Fernandes <joel@...lfernandes.org>,
	Josh Triplett <josh@...htriplett.org>,
	Lai Jiangshan <jiangshanlai@...il.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Neeraj Upadhyay <neeraj.upadhyay@....com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Uladzislau Rezki <urezki@...il.com>,
	Zqiang <qiang.zhang1211@...il.com>,
	rcu <rcu@...r.kernel.org>,
	Andrii Nakryiko <andrii@...nel.org>,
	Neeraj Upadhyay <Neeraj.Upadhyay@....com>,
	Frederic Weisbecker <frederic@...nel.org>
Subject: [PATCH 16/16] srcu: Improve srcu_read_lock_lite() kernel-doc comment

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

Where RCU is watching is where it is OK to invoke rcu_read_lock().

Reported-by: Andrii Nakryiko <andrii@...nel.org>
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
Acked-by: Andrii Nakryiko <andrii@...nel.org>
Reviewed-by: Neeraj Upadhyay <Neeraj.Upadhyay@....com>
Signed-off-by: Frederic Weisbecker <frederic@...nel.org>
---
 include/linux/srcu.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/linux/srcu.h b/include/linux/srcu.h
index 4ba96e2cfa40..bab1dae3f69e 100644
--- a/include/linux/srcu.h
+++ b/include/linux/srcu.h
@@ -270,7 +270,8 @@ static inline int srcu_read_lock(struct srcu_struct *ssp) __acquires(ssp)
  * synchronize_rcu_expedited(), IPIs and all.
  *
  * Note that srcu_read_lock_lite() can be invoked only from those contexts
- * where RCU is watching.  Otherwise, lockdep will complain.
+ * where RCU is watching, that is, from contexts where it would be legal
+ * to invoke rcu_read_lock().  Otherwise, lockdep will complain.
  */
 static inline int srcu_read_lock_lite(struct srcu_struct *ssp) __acquires(ssp)
 {
-- 
2.46.0