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

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Date:   Mon, 8 Feb 2021 07:30:37 +0100
From:   Mauro Carvalho Chehab <mchehab@...nel.org>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     Jacopo Mondi <jacopo+renesas@...ndi.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        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

Em Mon, 8 Feb 2021 11:32:08 +1100
Stephen Rothwell <sfr@...b.auug.org.au> escreveu:

> Hi all,
> 
> 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.

Thanks,
Mauro