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Date:	Tue, 21 Oct 2014 00:56:57 +0200
From:	Andreas Ruprecht <>
To:	Jim Davis <>,
	Stephen Rothwell <>,
	linux-kernel <>,
	linux-next <>,
	linux-media <>,
	"m.chehab" <>,
Subject: Re: randconfig build error with next-20141020, in drivers/media/platform/marvell-ccic/mcam-core.c


after a lot of staring at the configuration it seems like this boils
down to an issue within the Kconfig constraint description.

Broken down to the important bits:


- Both of these options are set to "*m*" in the configuration provided,
which means that CONFIG_VIDEOBUF2_DMA_SG will also be selected as "m".
According to Documentation/kbuild/kconfig-language.txt, line 101, "m" is
set as the minimal value for CONFIG_VIDEOBUF2_DMA_SG by the selects, and
as no other options select it as "y", it stays "m".

- CONFIG_VIDEO_CAFE_CCIC is set to "*y*".
The header file at drivers/media/platform/marvell-ccic/mcam-core.h then
sets an internal preprocessor variable in line 28:

#define MCAM_MODE_DMA_SG 1

The source code right around line 1299 in
drivers/media/platform/marvell-ccic/mcam-core.c, where the undefined
reference occurs, depends on MCAM_MODE_DMA_SG.

This means that CONFIG_VIDEOBUF2_DMA_SG is compiled as an LKM, thus the
reference for vb2_dma_sg_memops from mcam-core.c (which is statically
compiled) can not be resolved in the builtin.o files and vmlinux.

Unfortunately, I haven't got a solution on how to resolve that, but
maybe this summary helps someone else to come up with one.

Best regards,

On 20.10.2014 19:52, Jim Davis wrote:
> Building with the attached random configuration file,
> drivers/built-in.o: In function `mcam_setup_vb2':
> /home/jim/linux/drivers/media/platform/marvell-ccic/mcam-core.c:1299: undefined
> reference to `vb2_dma_sg_memops'
> make: *** [vmlinux] Error 1

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