Hi Faiyaz, Thank you for the patch! Yet something to improve: [auto build test ERROR on v5.12-rc6] [cannot apply to hnaz-linux-mm/master next-20210406] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Faiyaz-Mohammed/mm-slub-move-sysfs-slab-alloc-free-interfaces-to-debugfs/20210406-202954 base: e49d033bddf5b565044e2abe4241353959bc9120 config: mips-ath25_defconfig (attached as .config) compiler: mips-linux-gcc (GCC) 9.3.0 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 # https://github.com/0day-ci/linux/commit/00c0bfb05271bdd3e80f4e9c62da9ce5287b8f93 git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Faiyaz-Mohammed/mm-slub-move-sysfs-slab-alloc-free-interfaces-to-debugfs/20210406-202954 git checkout 00c0bfb05271bdd3e80f4e9c62da9ce5287b8f93 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=mips If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot All errors (new ones prefixed by >>): mips-linux-ld: mm/slub.o: in function `__kmem_cache_create': >> slub.c:(.text+0x2c78): undefined reference to `debugfs_slab_add' --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org