linux-kernel - Re: ERROR: modpost: "gpmc_omap_get_nand_ops" [drivers/mtd/nand/raw/omap2

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Message-ID: <57ad6f87-2198-92c6-8c26-f5b5a8d8a354@canonical.com>
Date:   Mon, 17 Jan 2022 14:08:21 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Roger Quadros <rogerq@...nel.org>,
        kernel test robot <lkp@...el.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: Re: ERROR: modpost: "gpmc_omap_get_nand_ops"
 [drivers/mtd/nand/raw/omap2_nand.ko] undefined!

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@...el.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