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Message-ID: <20250305030505.94059-7-boqun.feng@gmail.com>
Date: Tue, 4 Mar 2025 19:05:01 -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, Breno Leitao <leitao@...ian.org>,
Valentin Schneider <vschneid@...hat.com>
Subject: [PATCH rcu 06/10] context_tracking: Make RCU watch ct_kernel_exit_state() warning
From: "Paul E. McKenney" <paulmck@...nel.org>
The WARN_ON_ONCE() in ct_kernel_exit_state() follows the call to
ct_state_inc(), which means that RCU is not watching this WARN_ON_ONCE().
This can (and does) result in extraneous lockdep warnings when this
WARN_ON_ONCE() triggers. These extraneous warnings are the opposite
of helpful.
Therefore, invert the WARN_ON_ONCE() condition and move it before the
call to ct_state_inc(). This does mean that the ct_state_inc() return
value can no longer be used in the WARN_ON_ONCE() condition, so discard
this return value and instead use a call to rcu_is_watching_curr_cpu().
This call is executed only in CONFIG_RCU_EQS_DEBUG=y kernels, so there
is no added overhead in production use.
[Boqun: Add the subsystem tag in the title]
Reported-by: Breno Leitao <leitao@...ian.org>
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
Reviewed-by: Valentin Schneider <vschneid@...hat.com>
Reviewed-by: Frederic Weisbecker <frederic@...nel.org>
Link: https://lore.kernel.org/r/bd911cd9-1fe9-447c-85e0-ea811a1dc896@paulmck-laptop
Signed-off-by: Boqun Feng <boqun.feng@...il.com>
---
kernel/context_tracking.c | 9 ++++-----
1 file changed, 4 insertions(+), 5 deletions(-)
diff --git a/kernel/context_tracking.c b/kernel/context_tracking.c
index 938c48952d26..fb5be6e9b423 100644
--- a/kernel/context_tracking.c
+++ b/kernel/context_tracking.c
@@ -80,17 +80,16 @@ static __always_inline void rcu_task_trace_heavyweight_exit(void)
*/
static noinstr void ct_kernel_exit_state(int offset)
{
- int seq;
-
/*
* CPUs seeing atomic_add_return() must see prior RCU read-side
* critical sections, and we also must force ordering with the
* next idle sojourn.
*/
rcu_task_trace_heavyweight_enter(); // Before CT state update!
- seq = ct_state_inc(offset);
- // RCU is no longer watching. Better be in extended quiescent state!
- WARN_ON_ONCE(IS_ENABLED(CONFIG_RCU_EQS_DEBUG) && (seq & CT_RCU_WATCHING));
+ // RCU is still watching. Better not be in extended quiescent state!
+ WARN_ON_ONCE(IS_ENABLED(CONFIG_RCU_EQS_DEBUG) && !rcu_is_watching_curr_cpu());
+ (void)ct_state_inc(offset);
+ // RCU is no longer watching.
}
/*
--
2.48.1
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