linux-kernel - Re: [PATCH] lockdep: be nice about building from userspace

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Date:	Tue, 20 Nov 2012 01:40:24 -0500
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Sasha Levin <sasha.levin@...cle.com>
CC:	peterz@...radead.org, mingo@...hat.com,
	linux-kernel@...r.kernel.org, penberg@...nel.org
Subject: Re: [PATCH] lockdep: be nice about building from userspace

Ping?

On 11/12/2012 03:50 PM, Sasha Levin wrote:
> Lockdep is an awesome piece of code which detects locking issues which are
> relevant both to userspace and kernelspace. We can easily make lockdep
> work in userspace since there is really no kernel spacific magic going
> on in the code.
> 
> All we need is to wrap two functions which are used by lockdep and are
> very kernel specific.
> 
> Doing that will allow tools located in tools/ to easily utilize lockdep's
> code for their own use.
> 
> Signed-off-by: Sasha Levin <sasha.levin@...cle.com>
> ---
>  kernel/lockdep.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/kernel/lockdep.c b/kernel/lockdep.c
> index 7981e5b..e898cfe 100644
> --- a/kernel/lockdep.c
> +++ b/kernel/lockdep.c
> @@ -584,6 +584,7 @@ static int very_verbose(struct lock_class *class)
>  /*
>   * Is this the address of a static object:
>   */
> +#ifdef __KERNEL__
>  static int static_obj(void *obj)
>  {
>  	unsigned long start = (unsigned long) &_stext,
> @@ -610,6 +611,7 @@ static int static_obj(void *obj)
>  	 */
>  	return is_module_address(addr) || is_module_percpu_address(addr);
>  }
> +#endif
>  
>  /*
>   * To make lock name printouts unique, we calculate a unique
> @@ -4109,6 +4111,7 @@ void debug_check_no_locks_held(struct task_struct *task)
>  		print_held_locks_bug(task);
>  }
>  
> +#ifdef __KERNEL__
>  void debug_show_all_locks(void)
>  {
>  	struct task_struct *g, *p;
> @@ -4166,6 +4169,7 @@ retry:
>  		read_unlock(&tasklist_lock);
>  }
>  EXPORT_SYMBOL_GPL(debug_show_all_locks);
> +#endif
>  
>  /*
>   * Careful: only use this function if you are sure that
> 

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