linux-kernel - Re: linux-next: build warning after merge of the v4l-dvb tree

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Date:   Mon, 08 Feb 2021 13:57:56 -0300
From:   Ezequiel Garcia <ezequiel@...labora.com>
To:     Sakari Ailus <sakari.ailus@...ux.intel.com>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: Re: linux-next: build warning after merge of the v4l-dvb tree

On Mon, 2021-02-08 at 18:46 +0200, Sakari Ailus wrote:
> Hi Ezequiel,
> 
> Thanks for addressing this.
> 
> On Mon, Feb 08, 2021 at 01:42:21PM -0300, Ezequiel Garcia wrote:
> > Hi Stephen,
> > 
> > On Mon, 2021-02-08 at 23:37 +1100, Stephen Rothwell wrote:
> > > Hi all,
> > > 
> > > After merging the v4l-dvb tree, today's linux-next build (htmldocs)
> > > produced this warning:
> > > 
> > > include/media/v4l2-async.h:178: warning: expecting prototype for v4l2_async_notifier_add_fwnode_subdev(). Prototype was for
> > > __v4l2_async_notifier_add_fwnode_subdev() instead
> > > include/media/v4l2-async.h:207: warning: expecting prototype for v4l2_async_notifier_add_fwnode_remote_subdev(). Prototype was for
> > > __v4l2_async_notifier_add_fwnode_remote_subdev() instead
> > > include/media/v4l2-async.h:230: warning: expecting prototype for v4l2_async_notifier_add_i2c_subdev(). Prototype was for
> > > __v4l2_async_notifier_add_i2c_subdev() instead
> > > 
> > > Maybe introduced by commit
> > > 
> > >   c1cc23625062 ("media: v4l2-async: Discourage use of v4l2_async_notifier_add_subdev")
> > > 
> > 
> > Thanks for spotting this. Should be fixed by:
> > 
> > diff --git a/include/media/v4l2-async.h b/include/media/v4l2-async.h
> > index 6f22daa6f067..3785445282fc 100644
> > --- a/include/media/v4l2-async.h
> > +++ b/include/media/v4l2-async.h
> > @@ -157,7 +157,7 @@ int __v4l2_async_notifier_add_subdev(struct v4l2_async_notifier *notifier,
> >                                    struct v4l2_async_subdev *asd);
> >  
> >  /**
> > - * v4l2_async_notifier_add_fwnode_subdev - Allocate and add a fwnode async
> > + * __v4l2_async_notifier_add_fwnode_subdev - Allocate and add a fwnode async
> 
> The problem with the approach is that this no longer documents the API that
> drivers are intended to use, but the intermediate one. I guess fixing
> this properly could require changes to kerneldoc so I have no objections to
> the approach.
> 

Right, but do we have any other solution here?

> >   *                             subdev to the notifier's master asd_list.
> >   *
> >   * @notifier: pointer to &struct v4l2_async_notifier
> > @@ -181,7 +181,7 @@ __v4l2_async_notifier_add_fwnode_subdev(struct v4l2_async_notifier *notifier,
> >                                                    sizeof(__type)))
> >  
> >  /**
> > - * v4l2_async_notifier_add_fwnode_remote_subdev - Allocate and add a fwnode
> > + * __v4l2_async_notifier_add_fwnode_remote_subdev - Allocate and add a fwnode
> >   *                                               remote async subdev to the
> >   *                                               notifier's master asd_list.
> >   *
> > @@ -210,7 +210,7 @@ __v4l2_async_notifier_add_fwnode_remote_subdev(struct v4l2_async_notifier *notif
> >                                                           sizeof(__type)))
> >  
> >  /**
> > - * v4l2_async_notifier_add_i2c_subdev - Allocate and add an i2c async
> > + * __v4l2_async_notifier_add_i2c_subdev - Allocate and add an i2c async
> >   *                             subdev to the notifier's master asd_list.
> >   *
> >   * @notifier: pointer to &struct v4l2_async_notifier
> > @@ -228,7 +228,7 @@ struct v4l2_async_subdev *
> >  __v4l2_async_notifier_add_i2c_subdev(struct v4l2_async_notifier *notifier,
> >                                      int adapter_id, unsigned short address,
> >                                      unsigned int asd_struct_size);
> > -#define v4l2_async_notifier_add_i2c_subdev(__notifier, __adap, __addr, __type) \
> > +#define v4l2_async_notifier_i2c(__notifier, __adap, __addr, __type)    \
> 
> I guess this change was not intentional?
> 

Indeed :)

Thanks,
Ezequiel