Re: ERROR: modpost: "gpmc_omap_get_nand_ops" [drivers/mtd/nand/raw/omap2_nand.ko] undefined!

Krzysztof Kozlowski
2022-01-17T13:08:32Z

On 17/01/2022 13:35, Roger Quadros wrote:
> Hi,
>
> On 17/01/2022 12:51, kernel test robot wrote:
>> tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>> head: 0c947b893d69231a9add855939da7c66237ab44f
>> commit: dbcb124acebd8148e9e858a231f1798956dd3ca6 mtd: rawnand: omap2: Select GPMC device driver for ARCH_K3
>> date: 4 weeks ago
>> config: arm64-randconfig-r001-20220117 (https://download.01.org/0day-ci/archive/20220117/202201171805.5HeoR4rS-lkp@intel.com/config)
>> compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 5f782d25a742302d25ef3c8b84b54f7483c2deb9)
>> reproduce (this is a W=1 build):
>> wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>> chmod +x ~/bin/make.cross
>> # install arm64 cross compiling tool for clang build
>> # apt-get install binutils-aarch64-linux-gnu
>> # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=dbcb124acebd8148e9e858a231f1798956dd3ca6
>> git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>> git fetch --no-tags linus master
>> git checkout dbcb124acebd8148e9e858a231f1798956dd3ca6
>> # save the config file to linux build tree
>> mkdir build_dir
>> COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash
>>
>> If you fix the issue, kindly add following tag as appropriate
>> Reported-by: kernel test robot <lkp@intel.com>
>>
>> All errors (new ones prefixed by >>, old ones prefixed by <<):
>>
>>>> ERROR: modpost: "gpmc_omap_get_nand_ops" [drivers/mtd/nand/raw/omap2_nand.ko] undefined!
>
> The issue is that CONFIG_MEMORY is not set so OMAP_GPMC driver is not built causing the above undefined symbol error.
>
>>
>> Kconfig warnings: (for reference only)
>> WARNING: unmet direct dependencies detected for OMAP_GPMC
>> Depends on MEMORY && OF_ADDRESS
>> Selected by
>> - MTD_NAND_OMAP2 && MTD && MTD_RAW_NAND && (ARCH_OMAP2PLUS || ARCH_KEYSTONE || COMPILE_TEST && HAS_IOMEM && ARCH_K3
>>
>
> A possible fix would be to select MEMORY along with OMAP_GPMC at the below location
>
> config MTD_NAND_OMAP2
> tristate "OMAP2, OMAP3, OMAP4 and Keystone NAND controller"
> depends on ARCH_OMAP2PLUS || ARCH_KEYSTONE || ARCH_K3 || COMPILE_TEST
> depends on HAS_IOMEM
> select MEMORY
> ^^
> select OMAP_GPMC if ARCH_K3
> help
> Support for NAND flash on Texas Instruments OMAP2, OMAP3, OMAP4
> and Keystone platforms.
>
>
> Is this OK?

Instead rather "select MEMORY if ARCH_K3"?

However I had impression that selecting a user-visible options is
discouraged, especially from within the drivers. What I would expect is
to select it from the machine/architecture code like you did before [1]
but was rejected by Nishanth.

https://lore.kernel.org/linux-devicetree/20211217161417.q2qwwlki7oieqzjd@headlock/

In such case, your choice (with if ARCH...?) seems sensible.
MTD_NAND_FSL_IFC already does it.

Best regards,
Krzysztof