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Date:   Sun, 17 Sep 2017 10:57:42 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     paulmck@...ux.vnet.ibm.com
Cc:     LKML <linux-kernel@...r.kernel.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        Jonathan Corbet <corbet@....net>
Subject: Re: rcu kernel-doc issues (4.14-rc1)

On 09/17/17 10:47, Paul E. McKenney wrote:
> On Sat, Sep 16, 2017 at 09:41:45PM -0700, Paul E. McKenney wrote:
>> On Sat, Sep 16, 2017 at 06:26:04PM -0700, Randy Dunlap wrote:
>>> On 4.14-rc1, I am seeing lots of warnings on rcu kernel-doc:
>>>
>>> .. kernel-doc:: include/linux/rcupdate.h
>>>    :external:
>>> ./Documentation/core-api/kernel-api.rst:357: ERROR: Error in "kernel-doc" directive:
>>> unknown option: "external".
>>
>> $ grep external include/linux/rcupdate.h
>>  * by a single external-to-structure RCU-protected pointer, then you may
>>  * external-to-structure pointer -after- you have completely initialized
>>
>> Do these comments somehow qualify as an "external" option?  If so, how
>> do I tell kernel-doc to ignore them?  Or must I reword them to avoid
>> the word "external"?
>>
>>> .. kernel-doc:: include/linux/rcupdate_wait.h
>>>    :external:
>>> ./Documentation/core-api/kernel-api.rst:360: ERROR: Error in "kernel-doc" directive:
>>> unknown option: "external".
>>
>> $ grep external include/linux/rcupdate_wait.h
>>
>> There is no occurrence of the string "external" in this file.  So this
>> "external" option is unknown to me as well.  So, any hints on how I
>> should interpret these error messages?
> 
> And thanks to Akira Yokosawa for pointing out my confusion in reading
> these error messages.  The line numbers of course apply to the file
> Documentation/core-api/kernel-api.rst rather than the various RCU
> C-language source files.
> 
> The patch below removes the error messages for me.  Is this what you
> had in mind?  (Might need other options at some point, but somewhere
> to start.)
> 

Yes, much better.  Thanks.

Just some missing kernel-doc on parameters mostly remaining:

../include/linux/rcupdate.h:818: warning: No description found for parameter 'p'
../include/linux/rcupdate.h:818: warning: No description found for parameter 'v'
../include/linux/rcupdate.h:826: warning: No description found for parameter 'p'
../include/linux/rcupdate.h:826: warning: No description found for parameter 'v'
../include/linux/srcu.h:95: warning: No description found for parameter 'sp'
../kernel/rcu/srcutree.c:873: warning: No description found for parameter 'rhp'
../kernel/rcu/srcutree.c:873: warning: Excess function parameter 'head' description in 'call_srcu'
../include/linux/rculist.h:302: warning: Incorrect use of kernel-doc format:  * list_first_or_null_rcu - get the first element from a list
../include/linux/rculist.h:317: warning: No description found for parameter 'ptr'
../include/linux/rculist.h:317: warning: No description found for parameter 'type'
../include/linux/rculist.h:317: warning: No description found for parameter 'member'
../kernel/rcu/sync.c:94: warning: No description found for parameter 'rsp'
../kernel/rcu/sync.c:162: warning: No description found for parameter 'rcu'
../kernel/rcu/sync.c:162: warning: Excess function parameter 'rsp' description in 'rcu_sync_func'

> 
> ------------------------------------------------------------------------
> 
> diff --git a/Documentation/core-api/kernel-api.rst b/Documentation/core-api/kernel-api.rst
> index 8282099e0cbf..30b2666bf494 100644
> --- a/Documentation/core-api/kernel-api.rst
> +++ b/Documentation/core-api/kernel-api.rst
> @@ -352,44 +352,44 @@ Read-Copy Update (RCU)
>  ----------------------
>  
>  .. kernel-doc:: include/linux/rcupdate.h
> -   :external:
> +   :export
>  
>  .. kernel-doc:: include/linux/rcupdate_wait.h
> -   :external:
> +   :export
>  
>  .. kernel-doc:: include/linux/rcutree.h
> -   :external:
> +   :export
>  
>  .. kernel-doc:: kernel/rcu/tree.c
> -   :external:
> +   :export
>  
>  .. kernel-doc:: kernel/rcu/tree_plugin.h
> -   :external:
> +   :export
>  
>  .. kernel-doc:: kernel/rcu/tree_exp.h
> -   :external:
> +   :export
>  
>  .. kernel-doc:: kernel/rcu/update.c
> -   :external:
> +   :export
>  
>  .. kernel-doc:: include/linux/srcu.h
> -   :external:
> +   :export
>  
>  .. kernel-doc:: kernel/rcu/srcutree.c
> -   :external:
> +   :export
>  
>  .. kernel-doc:: include/linux/rculist_bl.h
> -   :external:
> +   :export
>  
>  .. kernel-doc:: include/linux/rculist.h
> -   :external:
> +   :export
>  
>  .. kernel-doc:: include/linux/rculist_nulls.h
> -   :external:
> +   :export
>  
>  .. kernel-doc:: include/linux/rcu_sync.h
> -   :external:
> +   :export
>  
>  .. kernel-doc:: kernel/rcu/sync.c
> -   :external:
> +   :export
>  
> 
> --


-- 
~Randy

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