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

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/commi... 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(a)intel.com&gt; All errors (new ones prefixed by >>, old ones prefixed by <<): --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org