linux-kernel - Re: [PATCH] lockdep: Make LOCKDEP_CROSSRELEASE part of PROVE

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Date:   Thu, 17 Aug 2017 09:49:29 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Byungchul Park <byungchul.park@....com>
Cc:     peterz@...radead.org, linux-kernel@...r.kernel.org,
        kernel-team@....com
Subject: Re: [PATCH] lockdep: Make LOCKDEP_CROSSRELEASE part of PROVE_LOCKING


* Byungchul Park <byungchul.park@....com> wrote:

> I am not sure if I did as Ingo suggested. Is this what you intended?
> 
> ----->8-----
> From 64c705bfedf45b2c56a0d2f4c65a998a1b730310 Mon Sep 17 00:00:00 2001
> From: Byungchul Park <byungchul.park@....com>
> Date: Thu, 17 Aug 2017 09:12:18 +0900
> Subject: [PATCH] lockdep: Make LOCKDEP_CROSSRELEASE part of PROVE_LOCKING
> 
> Crossrelease added the following two configs in Kconfig:
> 
>    LOCKDEP_CROSSRELEASE depending on PROVE_LOCKING
>    LOCKDEP_COMPLETE depending on PROVE_LOCKING
> 
> Remove the dependencies and make them all part of PROVE_LOCKING, like
> most of the other lock debugging bits.
> 
> Signed-off-by: Byungchul Park <byungchul.park@....com>
> ---
>  lib/Kconfig.debug | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
> index ee9e534..43ab713 100644
> --- a/lib/Kconfig.debug
> +++ b/lib/Kconfig.debug
> @@ -1084,6 +1084,8 @@ config PROVE_LOCKING
>  	select DEBUG_MUTEXES
>  	select DEBUG_RT_MUTEXES if RT_MUTEXES
>  	select DEBUG_LOCK_ALLOC
> +	select LOCKDEP_CROSSRELEASE
> +	select LOCKDEP_COMPLETE
>  	select TRACE_IRQFLAGS
>  	default n
>  	help
> @@ -1155,7 +1157,7 @@ config LOCK_STAT
>  
>  config LOCKDEP_CROSSRELEASE
>  	bool "Lock debugging: make lockdep work for crosslocks"
> -	depends on PROVE_LOCKING
> +	depends on DEBUG_KERNEL

This should be a non-interactive option - it makes little sense to enable it when 
lockdep is disabled.

>  	default n
>  	help
>  	 This makes lockdep work for crosslock which is a lock allowed to
> @@ -1167,7 +1169,7 @@ config LOCKDEP_CROSSRELEASE
>  
>  config LOCKDEP_COMPLETE
>  	bool "Lock debugging: allow completions to use deadlock detector"
> -	depends on PROVE_LOCKING
> +	depends on DEBUG_KERNEL
>  	select LOCKDEP_CROSSRELEASE

Ditto.

Thanks,

	Ingo