RCU Archive on lore.kernel.org
 help / color / Atom feed
From: Lukas Bulwahn <lukas.bulwahn@gmail.com>
To: Uladzislau Rezki <urezki@gmail.com>
Cc: "linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
	Josh Triplett <josh@joshtriplett.org>,
	rcu@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: Thu, 7 Jan 2021 08:28:18 +0100
Message-ID: <CAKXUXMx6mjMz=RejEpL-VZQYp8MTkpU=9qMgvKAVsnpqGqkFkw@mail.gmail.com> (raw)
In-Reply-To: <20210105162919.GA1800@pc638.lan>

On Tue, Jan 5, 2021 at 5:29 PM Uladzislau Rezki <urezki@gmail.com> wrote:
>
> 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@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.  ;-)
> >
> 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?
>

I think you can shorten the feedback loop.
IMHO, the documentation is as comprehensible as before and it makes a
warning go away (getting us back to the zero-documentation-warnings
state).

Just send out your patch with linux-doc as CC and if there is no
complaint within a few days, Paul will pick it up and it is all good.

Lukas

  reply index

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-05  7:32 Lukas Bulwahn
2021-01-05 13:14 ` Uladzislau Rezki
2021-01-05 14:03   ` Lukas Bulwahn
2021-01-05 14:56   ` Paul E. McKenney
2021-01-05 16:29     ` Uladzislau Rezki
2021-01-07  7:28       ` Lukas Bulwahn [this message]
2021-01-07 13:00         ` Uladzislau Rezki

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to='CAKXUXMx6mjMz=RejEpL-VZQYp8MTkpU=9qMgvKAVsnpqGqkFkw@mail.gmail.com' \
    --to=lukas.bulwahn@gmail.com \
    --cc=jiangshanlai@gmail.com \
    --cc=joel@joelfernandes.org \
    --cc=josh@joshtriplett.org \
    --cc=linux-doc@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=mathieu.desnoyers@efficios.com \
    --cc=rcu@vger.kernel.org \
    --cc=rostedt@goodmis.org \
    --cc=urezki@gmail.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

RCU Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/rcu/0 rcu/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 rcu rcu/ https://lore.kernel.org/rcu \
		rcu@vger.kernel.org
	public-inbox-index rcu

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.rcu


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git