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

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Message-ID: <20241001131755.1c8e62ff@foz.lan>
Date: Tue, 1 Oct 2024 13:18:00 +0200
From: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
To: Sakari Ailus <sakari.ailus@...ux.intel.com>
Cc: Stephen Rothwell <sfr@...b.auug.org.au>, Greg KH <greg@...ah.com>, Mauro
 Carvalho Chehab <mchehab@...nel.org>, David Plowman
 <david.plowman@...pberrypi.com>, Hans Verkuil <hverkuil-cisco@...all.nl>,
 Jacopo Mondi <jacopo.mondi@...asonboard.com>, Naushir Patuck
 <naush@...pberrypi.com>, Nick Hollinghurst
 <nick.hollinghurst@...pberrypi.org>, Uwe Kleine-König
 <u.kleine-koenig@...gutronix.de>, Linux Kernel Mailing List
 <linux-kernel@...r.kernel.org>, Linux Next Mailing List
 <linux-next@...r.kernel.org>
Subject: Re: linux-next: build failure after merge of the driver-core tree

Em Tue, 9 Jul 2024 15:26:36 +0000
Sakari Ailus <sakari.ailus@...ux.intel.com> escreveu:

> On Tue, Jul 09, 2024 at 03:09:34PM +0000, Sakari Ailus wrote:
> > Hi Stephen,
> > 
> > Thanks for the patch.
> > 
> > On Tue, Jul 09, 2024 at 04:37:15PM +1000, Stephen Rothwell wrote:  
> > > Hi all,
> > > 
> > > After merging the driver-core tree, today's linux-next build (x86_64
> > > allmodconfig) failed like this:
> > > 
> > > drivers/media/platform/raspberrypi/pisp_be/pisp_be.c:1786:27: error: initialization of 'void (*)(struct platform_device *)' from incompatible pointer type 'int (*)(struct platform_device *)' [-Werror=incompatible-pointer-types]
> > >  1786 |         .remove         = pispbe_remove,
> > >       |                           ^~~~~~~~~~~~~
> > > drivers/media/platform/raspberrypi/pisp_be/pisp_be.c:1786:27: note: (near initialization for 'pispbe_pdrv.<anonymous>.remove')
> > > cc1: all warnings being treated as errors
> > > 
> > > Caused by commit
> > > 
> > >   0edb555a65d1 ("platform: Make platform_driver::remove() return void")
> > > 
> > > interacting withc commit
> > > 
> > >   12187bd5d4f8 ("media: raspberrypi: Add support for PiSP BE")
> > > 
> > > from the vl4-dvb-next tree.
> > > 
> > > I have applied the following fix up patch.
> > > 
> > > From: Stephen Rothwell <sfr@...b.auug.org.au>
> > > Date: Tue, 9 Jul 2024 16:03:05 +1000
> > > Subject: [PATCH] fix up for "platform: Make platform_driver::remove() return void"
> > > 
> > > interacting with commit
> > > 
> > >   12187bd5d4f8 ("media: raspberrypi: Add support for PiSP BE")
> > > 
> > > from the v4l-dvb-next tree.
> > > 
> > > Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
> > > ---
> > >  drivers/media/platform/raspberrypi/pisp_be/pisp_be.c | 4 +---
> > >  1 file changed, 1 insertion(+), 3 deletions(-)
> > > 
> > > diff --git a/drivers/media/platform/raspberrypi/pisp_be/pisp_be.c b/drivers/media/platform/raspberrypi/pisp_be/pisp_be.c
> > > index e74df5b116dc..7596ae1f7de6 100644
> > > --- a/drivers/media/platform/raspberrypi/pisp_be/pisp_be.c
> > > +++ b/drivers/media/platform/raspberrypi/pisp_be/pisp_be.c
> > > @@ -1756,7 +1756,7 @@ static int pispbe_probe(struct platform_device *pdev)
> > >  	return ret;
> > >  }
> > >  
> > > -static int pispbe_remove(struct platform_device *pdev)
> > > +static void pispbe_remove(struct platform_device *pdev)  
> > 
> > While this approach works when the patch is squashed to commit
> > 0edb555a65d1, it's better to also use the remove_new op as its return type
> > won't be changed. That can be merged independently of commit 0edb555a65d1.
> > 
> > Feel free to submit v2, I can post a modified patch as well.  
> 
> IOW, I'll add this and post v2:
> 
> diff --git a/drivers/media/platform/raspberrypi/pisp_be/pisp_be.c b/drivers/media/platform/raspberrypi/pisp_be/pisp_be.c
> index 7596ae1f7de6..65ff2382cffe 100644
> --- a/drivers/media/platform/raspberrypi/pisp_be/pisp_be.c
> +++ b/drivers/media/platform/raspberrypi/pisp_be/pisp_be.c
> @@ -1781,7 +1781,7 @@ MODULE_DEVICE_TABLE(of, pispbe_of_match);
>  
>  static struct platform_driver pispbe_pdrv = {
>         .probe          = pispbe_probe,
> -       .remove         = pispbe_remove,
> +       .remove_new     = pispbe_remove,
>         .driver         = {
>                 .name   = PISPBE_NAME,
>                 .of_match_table = pispbe_of_match,
> 

Makes sense to me, as it prevents having a patch floating around at
-next to solve the conflict.

We can later migrate this one from remove_new to remove for
6.13, as the return argument for pispbe_remove is bogus.


Thanks,
Mauro