linux-kernel - [PATCH] locking/lockdep: use pr_warn_once for reporting that lockdep is turned off

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Date:   Wed, 20 Jul 2022 22:01:36 +0900
From:   Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] locking/lockdep: use pr_warn_once for reporting that lockdep
 is turned off

debug_show_all_locks() can be called for multiple times if
hung_task_call_panic = 0. No need to repeat this message.

Signed-off-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
---
 kernel/locking/lockdep.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
index 64a13eb56078..27be3c83c753 100644
--- a/kernel/locking/lockdep.c
+++ b/kernel/locking/lockdep.c
@@ -6490,7 +6490,7 @@ void debug_show_all_locks(void)
 	struct task_struct *g, *p;
 
 	if (unlikely(!debug_locks)) {
-		pr_warn("INFO: lockdep is turned off.\n");
+		pr_warn_once("INFO: lockdep is turned off.\n");
 		return;
 	}
 	pr_warn("\nShowing all locks held in the system:\n");
@@ -6518,7 +6518,7 @@ EXPORT_SYMBOL_GPL(debug_show_all_locks);
 void debug_show_held_locks(struct task_struct *task)
 {
 	if (unlikely(!debug_locks)) {
-		printk("INFO: lockdep is turned off.\n");
+		pr_warn_once("INFO: lockdep is turned off.\n");
 		return;
 	}
 	lockdep_print_held_locks(task);
-- 
2.18.4