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

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Message-ID: <CA+1xoqdUg8O709MTqv4puCtQ9=yKKQd++HzMDx-jEvi9omTTwA@mail.gmail.com>
Date:	Thu, 13 Dec 2012 13:42:49 -0500
From:	Sasha Levin <levinsasha928@...il.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 Tue, Nov 20, 2012 at 1:40 AM, Sasha Levin <sasha.levin@...cle.com> wrote:
> 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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