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Date:   Mon, 8 Feb 2021 09:49:01 +0100
From:   Mauro Carvalho Chehab <mchehab@kernel.org>
To:     Geert Uytterhoeven <geert@linux-m68k.org>
Cc:     Stephen Rothwell <sfr@canb.auug.org.au>,
        Jacopo Mondi <jacopo+renesas@jmondi.org>,
        Sakari Ailus <sakari.ailus@linux.intel.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linux Next Mailing List <linux-next@vger.kernel.org>
Subject: Re: linux-next: build warning after merge of the v4l-dvb tree
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        <CAMuHMdVTSCtwbTqBOag_sYHfDnVevZHxZyYOgHMVx936x=e1ZA@mail.gmail.com>
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Em Mon, 8 Feb 2021 09:33:14 +0100
Geert Uytterhoeven <geert@linux-m68k.org> escreveu:

> On Mon, Feb 8, 2021 at 7:35 AM Mauro Carvalho Chehab <mchehab@kernel.org> wrote:
> > Em Mon, 8 Feb 2021 11:32:08 +1100
> > Stephen Rothwell <sfr@canb.auug.org.au> escreveu:
> >  
> > > After merging the v4l-dvb tree, today's linux-next build (x86_64
> > > allmodconfig) produced this warning:
> > >
> > > WARNING: modpost: drivers/media/i2c/rdacm21-camera_module: 'max9271_set_serial_link' exported twice. Previous export was in drivers/media/i2c/rdacm20-camera_module.ko
> > > WARNING: modpost: drivers/media/i2c/rdacm21-camera_module: 'max9271_configure_i2c' exported twice. Previous export was in drivers/media/i2c/rdacm20-camera_module.ko
> > > WARNING: modpost: drivers/media/i2c/rdacm21-camera_module: 'max9271_set_high_threshold' exported twice. Previous export was in drivers/media/i2c/rdacm20-camera_module.ko
> > > WARNING: modpost: drivers/media/i2c/rdacm21-camera_module: 'max9271_configure_gmsl_link' exported twice. Previous export was in drivers/media/i2c/rdacm20-camera_module.ko
> > > WARNING: modpost: drivers/media/i2c/rdacm21-camera_module: 'max9271_set_gpios' exported twice. Previous export was in drivers/media/i2c/rdacm20-camera_module.ko
> > > WARNING: modpost: drivers/media/i2c/rdacm21-camera_module: 'max9271_clear_gpios' exported twice. Previous export was in drivers/media/i2c/rdacm20-camera_module.ko
> > > WARNING: modpost: drivers/media/i2c/rdacm21-camera_module: 'max9271_enable_gpios' exported twice. Previous export was in drivers/media/i2c/rdacm20-camera_module.ko
> > > WARNING: modpost: drivers/media/i2c/rdacm21-camera_module: 'max9271_disable_gpios' exported twice. Previous export was in drivers/media/i2c/rdacm20-camera_module.ko
> > > WARNING: modpost: drivers/media/i2c/rdacm21-camera_module: 'max9271_verify_id' exported twice. Previous export was in drivers/media/i2c/rdacm20-camera_module.ko
> > > WARNING: modpost: drivers/media/i2c/rdacm21-camera_module: 'max9271_set_address' exported twice. Previous export was in drivers/media/i2c/rdacm20-camera_module.ko
> > > WARNING: modpost: drivers/media/i2c/rdacm21-camera_module: 'max9271_set_deserializer_address' exported twice. Previous export was in drivers/media/i2c/rdacm20-camera_module.ko
> > > WARNING: modpost: drivers/media/i2c/rdacm21-camera_module: 'max9271_set_translation' exported twice. Previous export was in drivers/media/i2c/rdacm20-camera_module.ko
> > >
> > > Introduced by commit
> > >
> > >   a59f853b3b4b ("media: i2c: Add driver for RDACM21 camera module")
> > >  
> >
> > It sounds to be due to a Makefile mess:
> >
> >         drivers/media/i2c/Makefile:rdacm20-camera_module-objs   := rdacm20.o max9271.o
> >         drivers/media/i2c/Makefile:rdacm21-camera_module-objs   := rdacm21.o max9271.o
> >
> > Neither drivers should be including max9271.o as their objects, but, instead,
> > be addressing max9271 dependency via Kconfig.  
> 
> Wouldn't
> 
>     obj-$(CONFIG_VIDEO_RDACM20)     += rdacm20.o max9271.o
>     obj-$(CONFIG_VIDEO_RDACM21)     += rdacm21.o max9271.o
> 
> work, too?

Not 100% sure, but I guess this would cause problems with allyesconfig.

Thanks,
Mauro