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Date:   Thu, 10 Jan 2019 16:51:42 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Bart Van Assche <bvanassche@....org>
Cc:     mingo@...hat.com, tj@...nel.org, longman@...hat.com,
        johannes.berg@...el.com, linux-kernel@...r.kernel.org,
        Johannes Berg <johannes@...solutions.net>
Subject: Re: [PATCH v5 11/15] locking/lockdep: Check data structure
 consistency

On Mon, Dec 17, 2018 at 01:29:58PM -0800, Bart Van Assche wrote:
> Debugging lockdep data structure inconsistencies is challenging. Add
> disabled code that verifies data structure consistency at runtime.
> 
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Waiman Long <longman@...hat.com>
> Cc: Johannes Berg <johannes@...solutions.net>
> Signed-off-by: Bart Van Assche <bvanassche@....org>
> ---
>  kernel/locking/lockdep.c | 183 +++++++++++++++++++++++++++++++++++++++
>  1 file changed, 183 insertions(+)
> 
> diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
> index 3a63142d4764..d411660572e1 100644
> --- a/kernel/locking/lockdep.c
> +++ b/kernel/locking/lockdep.c
> @@ -74,6 +74,8 @@ module_param(lock_stat, int, 0644);
>  #define lock_stat 0
>  #endif
>  
> +static bool check_data_structure_consistency;

Should this maybe be CONFIG_DEBUG_LOCKDEP ?

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