linux-kernel - [PATCH rcu 01/10] rcu: Split rcu_report_exp_cpu_mult() mask parameter and use for tracing

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Message-ID: <20250305030505.94059-2-boqun.feng@gmail.com>
Date: Tue,  4 Mar 2025 19:04:56 -0800
From: Boqun Feng <boqun.feng@...il.com>
To: rcu@...r.kernel.org
Cc: Petr Mladek <pmladek@...e.com>,	Steven Rostedt <rostedt@...dmis.org>,
	John Ogness <john.ogness@...utronix.de>,
	Sergey Senozhatsky <senozhatsky@...omium.org>,
	"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>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Lai Jiangshan <jiangshanlai@...il.com>,
	Zqiang <qiang.zhang1211@...il.com>,	Davidlohr Bueso <dave@...olabs.net>,
	Shuah Khan <shuah@...nel.org>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Clark Williams <clrkwllms@...nel.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,	Yuntao Wang <ytcoode@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rasmus Villemoes <linux@...musvillemoes.dk>,
	Guo Weikang <guoweikang.kernel@...il.com>,	KP Singh <kpsingh@...nel.org>,
	Huang Shijie <shijie@...amperecomputing.com>,
	Raul E Rangel <rrangel@...omium.org>,
	Joel Granados <joel.granados@...nel.org>,
	Anna Schumaker <anna.schumaker@...cle.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Thomas Weißschuh <linux@...ssschuh.net>,
	zhangguopeng <zhangguopeng@...inos.cn>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Neeraj Upadhyay (AMD)" <neeraj.iitr10@...il.com>,
	linux-kernel@...r.kernel.org,	linux-kselftest@...r.kernel.org,
	linux-rt-devel@...ts.linux.dev
Subject: [PATCH rcu 01/10] rcu: Split rcu_report_exp_cpu_mult() mask parameter and use for tracing

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

This commit renames the rcu_report_exp_cpu_mult() function from "mask"
to "mask_in" and introduced a "mask" local variable to better support
upcoming event-tracing additions.

Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
Cc: Frederic Weisbecker <frederic@...nel.org>
Signed-off-by: Boqun Feng <boqun.feng@...il.com>
---
 kernel/rcu/tree_exp.h | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/kernel/rcu/tree_exp.h b/kernel/rcu/tree_exp.h
index 77efed89c79e..8d4895c854c5 100644
--- a/kernel/rcu/tree_exp.h
+++ b/kernel/rcu/tree_exp.h
@@ -230,17 +230,19 @@ static void __maybe_unused rcu_report_exp_rnp(struct rcu_node *rnp, bool wake)
  * specified leaf rcu_node structure, which is acquired by the caller.
  */
 static void rcu_report_exp_cpu_mult(struct rcu_node *rnp, unsigned long flags,
-				    unsigned long mask, bool wake)
+				    unsigned long mask_in, bool wake)
 				    __releases(rnp->lock)
 {
 	int cpu;
+	unsigned long mask;
 	struct rcu_data *rdp;
 
 	raw_lockdep_assert_held_rcu_node(rnp);
-	if (!(rnp->expmask & mask)) {
+	if (!(rnp->expmask & mask_in)) {
 		raw_spin_unlock_irqrestore_rcu_node(rnp, flags);
 		return;
 	}
+	mask = mask_in & rnp->expmask;
 	WRITE_ONCE(rnp->expmask, rnp->expmask & ~mask);
 	for_each_leaf_node_cpu_mask(rnp, cpu, mask) {
 		rdp = per_cpu_ptr(&rcu_data, cpu);
-- 
2.48.1