tree: https://github.com/0day-ci/linux/commits/UPDATE-20211012-182031/Vasily-Av... head: e10c5e64a0799c75d26d2a82c03f757335616711 commit: e10c5e64a0799c75d26d2a82c03f757335616711 memcg: enable memory accounting in __alloc_pages_bulk date: 5 hours ago config: um-x86_64_defconfig (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://github.com/0day-ci/linux/commit/e10c5e64a0799c75d26d2a82c03f75733... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review UPDATE-20211012-182031/Vasily-Averin/memcg-enable-memory-accounting-in-__alloc_pages_bulk/20211008-172703 git checkout e10c5e64a0799c75d26d2a82c03f757335616711 # save the attached .config to linux build tree mkdir build_dir make W=1 O=build_dir ARCH=um SUBARCH=x86_64 SHELL=/bin/bash 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 >>): /usr/bin/ld: mm/page_alloc.o: in function `__alloc_pages_bulk': /usr/bin/ld: page_alloc.c:(.text+0x5ea9): undefined reference to `memcg_bulk_post_charge_hook' collect2: error: ld returned 1 exit status --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org