linux-kernel - Re: [PATCH printk v3 01/40] rcu: implement lockdep_rcu_enabled for !CONFIG_DEBUG_LOCK

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Date:   Mon, 7 Nov 2022 10:01:57 -0800
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     John Ogness <john.ogness@...utronix.de>
Cc:     Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org,
        Frederic Weisbecker <frederic@...nel.org>,
        Neeraj Upadhyay <quic_neeraju@...cinc.com>,
        Josh Triplett <josh@...htriplett.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Joel Fernandes <joel@...lfernandes.org>, rcu@...r.kernel.org
Subject: Re: [PATCH printk v3 01/40] rcu: implement lockdep_rcu_enabled for
 !CONFIG_DEBUG_LOCK_ALLOC

On Mon, Nov 07, 2022 at 03:21:59PM +0106, John Ogness wrote:
> Provide an implementation for debug_lockdep_rcu_enabled() when
> CONFIG_DEBUG_LOCK_ALLOC is not enabled. This allows code to check
> if rcu lockdep debugging is available without needing an extra
> check if CONFIG_DEBUG_LOCK_ALLOC is enabled.
> 
> Signed-off-by: John Ogness <john.ogness@...utronix.de>

If you would like me to take this one, please let me know.

Otherwise:

Acked-by: Paul E. McKenney <paulmck@...nel.org>

> ---
>  I also sent this patch to Paul as a suggestion. If it is not
>  acceptable, I just need to add an ifdef CONFIG_DEBUG_LOCK_ALLOC
>  into console_list_lock() of patch 21.
> 
>  include/linux/rcupdate.h | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
> index 08605ce7379d..65178c40ab6f 100644
> --- a/include/linux/rcupdate.h
> +++ b/include/linux/rcupdate.h
> @@ -340,6 +340,11 @@ static inline int rcu_read_lock_any_held(void)
>  	return !preemptible();
>  }
>  
> +static inline int debug_lockdep_rcu_enabled(void)
> +{
> +	return 0;
> +}
> +
>  #endif /* #else #ifdef CONFIG_DEBUG_LOCK_ALLOC */
>  
>  #ifdef CONFIG_PROVE_RCU
> -- 
> 2.30.2
>