linux-kernel - Re: linux-next: build failure after merge of the driver-core tree

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Message-ID: <CAD=FV=WxwVQ5o3C8QkRe4BQwhQMimme1tX_2x-+Vw-BRm5D9jA@mail.gmail.com>
Date:   Thu, 12 Aug 2021 13:51:12 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>
Cc:     Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Greg KH <greg@...ah.com>, Dave Airlie <airlied@...ux.ie>,
        DRI <dri-devel@...ts.freedesktop.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: Re: linux-next: build failure after merge of the driver-core tree

Hi,

On Tue, Aug 10, 2021 at 5:13 AM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>
> On Fri, Jul 23, 2021 at 7:35 AM Uwe Kleine-König
> <u.kleine-koenig@...gutronix.de> wrote:
> > On Fri, Jul 23, 2021 at 03:09:44PM +1000, Stephen Rothwell wrote:
> > > After merging the driver-core tree, today's linux-next build (arm
> > > multi_v7_defconfig) failed like this:
> > >
> > > drivers/gpu/drm/drm_dp_aux_bus.c:106:13: error: initialization of 'void (*)(struct device *)' from incompatible pointer type 'int (*)(struct device *)' [-Werror=incompatible-pointer-types]
> > >   106 |  .remove  = dp_aux_ep_remove,
> > >       |             ^~~~~~~~~~~~~~~~
> > > drivers/gpu/drm/drm_dp_aux_bus.c:106:13: note: (near initialization for 'dp_aux_bus_type.remove')
> > >
> > > Caused by commit
> > >
> > >   aeb33699fc2c ("drm: Introduce the DP AUX bus")
> > >
> > > from the drm tree interacting with commit
> > >
> > >   fc7a6209d571 ("bus: Make remove callback return void")
> > >
> > > from the driver-core tree.
> > >
> > > I applied the following merge fix patch.
> > >
> > > From: Stephen Rothwell <sfr@...b.auug.org.au>
> > > Date: Fri, 23 Jul 2021 14:58:25 +1000
> > > Subject: [PATCH] fix for "drm: Introduce the DP AUX bus"
> > >
> > > interaction with "bus: Make remove callback return void"
> > >
> > > Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
> > > ---
> > >  drivers/gpu/drm/drm_dp_aux_bus.c | 5 +----
> > >  1 file changed, 1 insertion(+), 4 deletions(-)
> > >
> > > diff --git a/drivers/gpu/drm/drm_dp_aux_bus.c b/drivers/gpu/drm/drm_dp_aux_bus.c
> > > index e49a70f3691b..298ea7a49591 100644
> > > --- a/drivers/gpu/drm/drm_dp_aux_bus.c
> > > +++ b/drivers/gpu/drm/drm_dp_aux_bus.c
> > > @@ -67,9 +67,8 @@ static int dp_aux_ep_probe(struct device *dev)
> > >   *
> > >   * Calls through to the endpoint driver remove.
> > >   *
> > > - * Return: 0 if no error or negative error code.
> > >   */
> > > -static int dp_aux_ep_remove(struct device *dev)
> > > +static void dp_aux_ep_remove(struct device *dev)
> > >  {
> > >       struct dp_aux_ep_driver *aux_ep_drv = to_dp_aux_ep_drv(dev->driver);
> > >       struct dp_aux_ep_device *aux_ep = to_dp_aux_ep_dev(dev);
> > > @@ -77,8 +76,6 @@ static int dp_aux_ep_remove(struct device *dev)
> > >       if (aux_ep_drv->remove)
> > >               aux_ep_drv->remove(aux_ep);
> > >       dev_pm_domain_detach(dev, true);
> > > -
> > > -     return 0;
> > >  }
> >
> > This looks right.
> >
> > Greg provided a tag containing fc7a6209d571 ("bus: Make remove callback
> > return void") at
> >
> >         git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git tags/bus_remove_return_void-5.15
> >
> > (see https://lore.kernel.org/lkml/YPkwQwf0dUKnGA7L@kroah.com).
> >
> > It would be great if this could be merged into the drm tree with the
> > above diff squashed into the merge commit.
>
> +1.

I looked at trying to do this but I think it's beyond the scope of
privileges that I'm granted as a drm_misc committer (not a drm_misc
maintainer). Adding the official maintainers [1].
Maarten/Maxime/Thomas would this be something you could do?

[1] https://drm.pages.freedesktop.org/maintainer-tools/repositories.html

-Doug