ERROR: modpost: "devm_iio_dmaengine_buffer_alloc" [drivers/iio/adc/adi-axi-adc.ko] undefined!

[kernel test robot]

Hi Alexandru,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   a5e13c6df0e41702d2b2c77c8ad41677ebb065b3
commit: be24c65e9fa2486bb8ec98d9f592bdcf04bedd88 iio: adc: adi-axi-adc: add proper Kconfig dependencies
date:   6 weeks ago
config: i386-randconfig-a003-20210329 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=be24c65e9fa2486bb8ec98d9f592bdcf04bedd88
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout be24c65e9fa2486bb8ec98d9f592bdcf04bedd88
        # save the attached .config to linux build tree
        make W=1 ARCH=i386 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>, old ones prefixed by <<):

>> ERROR: modpost: "devm_iio_dmaengine_buffer_alloc" [drivers/iio/adc/adi-axi-adc.ko] undefined!

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for ADI_AXI_ADC
   Depends on IIO && HAS_IOMEM && OF
   Selected by
   - AD9467 && IIO && SPI

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