Hi "André, [FYI, it's a private test report for your RFC patch.] [auto build test WARNING on kselftest/next] [also build test WARNING on tip/x86/asm v5.7] [cannot apply to linus/master linux/master next-20200613] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/Andr-Almeida/futex2-Add-new-fute... base: https://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest.git next config: arm-randconfig-r006-20200612 (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project d7e6f116f4517952fbdf5ad4b5ff67e378600c60) 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 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>, old ones prefixed by <<): #warning syscall futex_wait not implemented ^ #warning syscall futex_wake not implemented ^ 2 warnings generated. -- #warning syscall futex_wait not implemented ^ #warning syscall futex_wake not implemented ^ 2 warnings generated. -- #warning syscall futex_wait not implemented ^ #warning syscall futex_wake not implemented ^ 2 warnings generated. --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org