linux-kernel - Re: kerneldoc warnings since commit 538fc2ee870a3 ("rcu: Introduce kfree

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Date:   Tue, 5 Jan 2021 17:29:19 +0100
From:   Uladzislau Rezki <urezki@...il.com>
To:     "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>
Cc:     Uladzislau Rezki <urezki@...il.com>,
        Lukas Bulwahn <lukas.bulwahn@...il.com>,
        Josh Triplett <josh@...htriplett.org>, rcu@...r.kernel.org,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Joel Fernandes <joel@...lfernandes.org>
Subject: Re: kerneldoc warnings since commit 538fc2ee870a3 ("rcu: Introduce
 kfree_rcu() single-argument macro")

On Tue, Jan 05, 2021 at 06:56:59AM -0800, Paul E. McKenney wrote:
> On Tue, Jan 05, 2021 at 02:14:41PM +0100, Uladzislau Rezki wrote:
> > Dear, Lukas.
> > 
> > > Dear Uladzislau,
> > > 
> > > in commit 538fc2ee870a3 ("rcu: Introduce kfree_rcu() single-argument
> > > macro"), you have refactored the kfree_rcu macro.
> > > 
> > > Since then, make htmldocs warns:
> > > 
> > > ./include/linux/rcupdate.h:882: warning: Excess function parameter
> > > 'ptr' description in 'kfree_rcu'
> > > ./include/linux/rcupdate.h:882: warning: Excess function parameter
> > > 'rhf' description in 'kfree_rcu'
> > > 
> > > As you deleted the two arguments in the macro definition, kerneldoc
> > > cannot resolve the argument names in the macro's kerneldoc
> > > documentation anymore and warns about that.
> > > 
> > > Probably, it is best to just turn the formal kerneldoc references to
> > > the two arguments, which are not used in the macro definition anymore,
> > > simply into two informal references in the documentation.
> > > 
> > Thanks for your suggestion. I am not sure if htmldocs supports something
> > like "__maybe_unused", but tend to say that it does not. See below the
> > patch:
> > 
> > <snip>
> > >From 65ecc7c58810c963c02e0596ce2e5758c54ef55d Mon Sep 17 00:00:00 2001
> > From: "Uladzislau Rezki (Sony)" <urezki@...il.com>
> > Date: Tue, 5 Jan 2021 13:23:30 +0100
> > Subject: [PATCH] rcu: fix kerneldoc warnings
> > 
> > After refactoring of the kfree_rcu(), it becomes possible to use
> > the macro with one or two arguments. From the other hand, in the
> > description there are two arguments in the macro definition expected.
> > That is why the "htmldocs" emits a warning about it:
> > 
> > <snip>
> > ./include/linux/rcupdate.h:882: warning: Excess function parameter
> > 'ptr' description in 'kfree_rcu'
> > ./include/linux/rcupdate.h:882: warning: Excess function parameter
> > 'rhf' description in 'kfree_rcu'
> > <snip>
> > 
> > Fix it by converting two parameters into informal references in the
> > macro description.
> > 
> > Fixes: 3d3d9ff077a9 ("rcu: Introduce kfree_rcu() single-argument macro")
> > Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>
> > ---
> >  include/linux/rcupdate.h | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
> > index ebd8dcca4997..e678ce7f5ca2 100644
> > --- a/include/linux/rcupdate.h
> > +++ b/include/linux/rcupdate.h
> > @@ -854,8 +854,8 @@ static inline notrace void rcu_read_unlock_sched_notrace(void)
> >  
> >  /**
> >   * kfree_rcu() - kfree an object after a grace period.
> > - * @ptr: pointer to kfree for both single- and double-argument invocations.
> > - * @rhf: the name of the struct rcu_head within the type of @ptr,
> > + * ptr: pointer to kfree for both single- and double-argument invocations.
> > + * rhf: the name of the struct rcu_head within the type of ptr,
> >   *       but only for double-argument invocations.
> >   *
> >   * Many rcu callbacks functions just call kfree() on the base structure.
> > -- 
> > 2.20.1
> > <snip>
> > 
> > Paul, does it work for you?
> 
> If it works for the documentation generation, then it works for me.  ;-)
> 
OK. Then we need the patch to be reviewed by the documentation generation :)

Dear, linux-doc folk!

Could you please review the patch that is in question?

Thank you in advance.

--
Vlad Rezki