[linux-next:master 2500/12695] ERROR: modpost: "iio_triggered_buffer_cleanup" [drivers/iio/dummy/iio_dummy.ko] undefined!

[linux-next:master 2500/12695] ERROR: modpost: "iio_triggered_buffer_cleanup" [drivers/iio/dummy/iio_dummy.ko] undefined!

[kernel test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   1c8ce959b41a18b9657eaafd7a1215a8da67d3ab
commit: 738f6ba1180046904402ffbe210fbd2fa2c4b050 [2500/12695] iio: dummy: iio_simple_dummy_buffer: use triggered buffer core calls
config: um-randconfig-r025-20210414 (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/next/linux-next.git/commit/?id=738f6ba1180046904402ffbe210fbd2fa2c4b050
        git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
        git fetch --no-tags linux-next master
        git checkout 738f6ba1180046904402ffbe210fbd2fa2c4b050
        # save the attached .config to linux build tree
        make W=1 W=1 ARCH=um 

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: "iio_triggered_buffer_cleanup" [drivers/iio/dummy/iio_dummy.ko] undefined!
>> ERROR: modpost: "iio_triggered_buffer_setup_ext" [drivers/iio/dummy/iio_dummy.ko] undefined!

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

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