tree: https://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git mpam/snapshot/v5.16 head: 364c1c42b229912132e1615c2ce15be7154e2156 commit: 626a68b7eb02b0a0bb7faaa4b91371c2f3d550d0 [88/137] cacheinfo: Allow for >32-bit cache 'id' config: arm-shannon_defconfig (https://download.01.org/0day-ci/archive/20220126/202201260326.obpo9ntU-lk...) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 997e128e2a78f5a5434fc75997441ae1ee76f8a4) 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://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git/commit/?i... git remote add morse https://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git git fetch --no-tags morse mpam/snapshot/v5.16 git checkout 626a68b7eb02b0a0bb7faaa4b91371c2f3d550d0 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash drivers/base/ 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 >>): In file included from drivers/base/cacheinfo.c:12: return ~0ULL; ~~~~~~ ^~~~~ include/linux/cacheinfo.h:120:11: warning: implicit conversion from 'unsigned long long' to 'unsigned long' changes value from 18446744073709551615 to 4294967295 [-Wconstant-conversion] return ~0ULL; ~~~~~~ ^~~~~ include/linux/cacheinfo.h:124:9: warning: implicit conversion from 'unsigned long long' to 'unsigned long' changes value from 18446744073709551615 to 4294967295 [-Wconstant-conversion] return ~0ULL; ~~~~~~ ^~~~~ 3 warnings generated. vim +114 include/linux/cacheinfo.h 103 104 /* 105 * Get the id of the cache associated with @cpu at level @level. 106 * cpuhp lock must be held. 107 */ 108 static inline unsigned long get_cpu_cacheinfo_id(int cpu, int level) 109 { 110 struct cpu_cacheinfo *ci = get_cpu_cacheinfo(cpu); 111 int i; 112 113 if (!ci->info_list) 115 116 for (i = 0; i < ci->num_leaves; i++) { 117 if (ci->info_list[i].level == level) { 118 if (ci->info_list[i].attributes & CACHE_ID) 119 return ci->info_list[i].id; 120 return ~0ULL; 121 } 122 } 123 124 return ~0ULL; 125 } 126 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org