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Date:   Sun, 17 Sep 2017 12:49:10 -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 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
> 

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