Re: kerneldoc warnings since commit 538fc2ee870a3 ("rcu: Introduce kfree_rcu() single-argument macro")

From: "Paul E. McKenney" <paulmck@kernel.org>
To: Uladzislau Rezki <urezki@gmail.com>
Cc: Lukas Bulwahn <lukas.bulwahn@gmail.com>,
	Josh Triplett <josh@joshtriplett.org>,
	rcu@vger.kernel.org,
	"linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Steven Rostedt <rostedt@goodmis.org>,
	Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
	Lai Jiangshan <jiangshanlai@gmail.com>,
	Joel Fernandes <joel@joelfernandes.org>
Subject: Re: kerneldoc warnings since commit 538fc2ee870a3 ("rcu: Introduce kfree_rcu() single-argument macro")
Date: Tue, 5 Jan 2021 06:56:59 -0800	[thread overview]
Message-ID: <20210105145659.GD17086@paulmck-ThinkPad-P72> (raw)
In-Reply-To: <20210105131441.GA2457@pc638.lan>

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@gmail.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@gmail.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.  ;-)

							Thanx, Paul