linux-kernel - Re: [PATCH 04/12] workqueue: Protect lockdep functions with #ifdef

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Date:   Tue, 8 Feb 2022 14:38:12 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>, Will Deacon <will@...nel.org>,
        Waiman Long <longman@...hat.com>,
        Boqun Feng <boqun.feng@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Byungchul Park <byungchul.park@....com>,
        "Paul E. McKenney" <paul.mckenney@...aro.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Radoslaw Burny <rburny@...gle.com>, Tejun Heo <tj@...nel.org>,
        Lai Jiangshan <jiangshanlai@...il.com>
Subject: Re: [PATCH 04/12] workqueue: Protect lockdep functions with #ifdef

On Tue,  8 Feb 2022 10:42:00 -0800
Namhyung Kim <namhyung@...nel.org> wrote:

> With upcoming lock tracepoints config, it'd define some of lockdep
> functions without enabling CONFIG_LOCKDEP actually.  The existing code
> assumes those functions will be removed by the preprocessor but it's
> not the case anymore.  Let's protect the code with #ifdef's explicitly.
> 
> Cc: Tejun Heo <tj@...nel.org>
> Cc: Lai Jiangshan <jiangshanlai@...il.com>
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---
>  kernel/workqueue.c | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> diff --git a/kernel/workqueue.c b/kernel/workqueue.c
> index 33f1106b4f99..405e27385f74 100644
> --- a/kernel/workqueue.c
> +++ b/kernel/workqueue.c
> @@ -2279,8 +2279,11 @@ __acquires(&pool->lock)
>  
>  	raw_spin_unlock_irq(&pool->lock);
>  
> +#ifdef CONFIG_LOCKDEP
>  	lock_map_acquire(&pwq->wq->lockdep_map);
>  	lock_map_acquire(&lockdep_map);
> +#endif

Same here:

	lock_map_acquire_raw() ?

That is always a nop when CONFIG_LOCKDEP is not set.

-- Steve