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

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Date:   Mon, 17 Jan 2022 14:35:15 +0200
From:   Roger Quadros <rogerq@...nel.org>
To:     kernel test robot <lkp@...el.com>,
        Krzysztof Kozlowski <krzk@...nel.org>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org, Krzysztof Kozlowski <krzk@...nel.org>
Subject: Re: ERROR: modpost: "gpmc_omap_get_nand_ops"
 [drivers/mtd/nand/raw/omap2_nand.ko] undefined!

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?

> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
> 

cheers,
-roger