Hi Nhat,

I love your patch! Perhaps something to improve:

[auto build test WARNING on shuah-kselftest/next]
[also build test WARNING on shuah-kselftest/fixes tip/x86/asm akpm-mm/mm-everything linus/master v6.1-rc8 next-20221205]
[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#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Nhat-Pham/cachestat-a-new-syscall-for-page-cache-state-of-files/20221206-015308
base:   https://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest.git next
patch link:    https://lore.kernel.org/r/20221205175140.1543229-4-nphamcs%40gmail.com
patch subject: [PATCH v2 3/4] cachestat: implement cachestat syscall
config: arm-lpc32xx_defconfig
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 6e4cea55f0d1104408b26ac574566a0e4de48036)
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
        # install arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # https://github.com/intel-lab-lkp/linux/commit/b45ed49f9d4f655a5e95c14f7019b455929f419d
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Nhat-Pham/cachestat-a-new-syscall-for-page-cache-state-of-files/20221206-015308
        git checkout b45ed49f9d4f655a5e95c14f7019b455929f419d
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm prepare

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> <stdin>:1565:2: warning: syscall cachestat not implemented [-W#warnings]
   #warning syscall cachestat not implemented
    ^
   1 warning generated.
--
>> <stdin>:1565:2: warning: syscall cachestat not implemented [-W#warnings]
   #warning syscall cachestat not implemented
    ^
   1 warning generated.
--
>> <stdin>:1565:2: warning: syscall cachestat not implemented [-W#warnings]
   #warning syscall cachestat not implemented
    ^
   1 warning generated.

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp