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

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Date:   Wed, 20 Jul 2022 17:37:44 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc:     Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] locking/lockdep: use pr_warn_once for reporting that
 lockdep is turned off

On Thu, Jul 21, 2022 at 12:13:31AM +0900, Tetsuo Handa wrote:
> On 2022/07/20 23:59, Peter Zijlstra wrote:
> > On Wed, Jul 20, 2022 at 10:01:36PM +0900, Tetsuo Handa wrote:
> >> debug_show_all_locks() can be called for multiple times if
> >> hung_task_call_panic = 0. No need to repeat this message.
> > 
> > That one extra line is really a problem?
> 
> When lockdep is turned off during boot or some testing, khungtaskd repeats
> this message, and I feel this repeated message useless.

I feel you should then fix the issue that lockdep is complaining about
instead of making the message go away.