Hi Sui,

[FYI, it's a private test report for your RFC patch.]
[auto build test ERROR on wsa/i2c/for-next]
[also build test ERROR on linux/master linus/master v5.16-rc3 next-20211203]
[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/Sui-Chen/I2C-statistics-as-sysfs-attributes/20211203-103913
base:   https://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git i2c/for-next
config: arc-nsimosci_defconfig (https://download.01.org/0day-ci/archive/20211203/202112032229.MtipbaGi-lkp(a)intel.com/config)
compiler: arc-elf-gcc (GCC) 11.2.0
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/16ccbe6d6d8b9a6e81ba9f40b70d3af92d04776e
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Sui-Chen/I2C-statistics-as-sysfs-attributes/20211203-103913
        git checkout 16ccbe6d6d8b9a6e81ba9f40b70d3af92d04776e
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=arc SHELL=/bin/bash

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 >>):

   arc-elf-ld: drivers/i2c/i2c-core-base.o: in function `i2c_register_adapter':
   i2c-core-base.c:(.text+0x1cbe): undefined reference to `i2c_adapter_create_stats_folder'
>> arc-elf-ld: i2c-core-base.c:(.text+0x1cbe): undefined reference to `i2c_adapter_create_stats_folder'

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