Hi, 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: - CONFIG_VIDEO_TW68 and CONFIG_VIDEO_SAA7134 *select* CONFIG_VIDEOBUF2_DMA_SG - 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: #if IS_ENABLED(CONFIG_VIDEOBUF2_DMA_SG) #define MCAM_MODE_DMA_SG 1 #endif 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, Andreas 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 > -- To unsubscribe from this list: send the line "unsubscribe linux-next" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
