linux-kernel - Re: rcu kernel-doc issues (4.14-rc1)

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Date:   Mon, 16 Oct 2017 13:26:19 -0700
From:   "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:     Randy Dunlap <rdunlap@...radead.org>
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 Mon, Oct 16, 2017 at 01:18:14PM -0700, Randy Dunlap wrote:
> On 10/16/17 13:07, Paul E. McKenney wrote:
> > On Mon, Oct 16, 2017 at 12:58:28PM -0700, Randy Dunlap wrote:
> >> Hi Jonathan and Paul,
> >>
> >> Please include these fixes before 4.14 final.
> > 
> > Hello, Randy,
> > 
> > I currently have them queued up for the 4.15 merge window.  Will that
> > work for you?
> 
> They should be fixed in 4.14 final IMO.

OK, how about if I submit them to the 4.15 merge window, but add the
appropriate -stable tags to get them backported?  Yes, these are bugs,
but I cannot in good conscience claim that they are v4.14 regressions.

But if Jon agrees with you, I will of course create a patch series,
pull request, or whatever and send it along to him.

							Thanx, Paul

> >> Thanks.
> >>
> >> On 09/17/17 12:49, Paul E. McKenney wrote:
> >>> On Sun, Sep 17, 2017 at 10:57:42AM -0700, Randy Dunlap wrote:
> >>>> 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:
> >>>
> >>> I have now fixed a number of these, thank you.
> >>>
> >>> Any hints for how to represent code samples within a "/**" comment?
> >>>
> >>> /home/git/linux-2.6-tip/include/linux/rcupdate.h:559: ERROR: Unexpected indentation.
> >>> /home/git/linux-2.6-tip/include/linux/rcupdate.h:563: WARNING: Block quote ends without a blank line; unexpected unindent.
> >>> /home/git/linux-2.6-tip/include/linux/rcupdate.h:777: ERROR: Unexpected indentation.
> >>> /home/git/linux-2.6-tip/include/linux/rcupdate.h:778: WARNING: Block quote ends without a blank line; unexpected unindent.
> >>>
> >>> 							Thanx, Paul
> >>>
> >>>> ../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
> >>
> > 
> 
> 
> -- 
> ~Randy
>