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: arc-randconfig-r043-20220124 (https://download.01.org/0day-ci/archive/20220126/202201260308.f359R4GZ-lk...) 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://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=gcc-11.2.0 make.cross O=build_dir ARCH=arc 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: include/linux/cacheinfo.h: In function 'get_cpu_cacheinfo_id': 114 | return ~0ULL; | ^ include/linux/cacheinfo.h:120:32: warning: conversion from 'long long unsigned int' to 'long unsigned int' changes value from '18446744073709551615' to '4294967295' [-Woverflow] 120 | return ~0ULL; | ^ include/linux/cacheinfo.h:124:16: warning: conversion from 'long long unsigned int' to 'long unsigned int' changes value from '18446744073709551615' to '4294967295' [-Woverflow] 124 | return ~0ULL; | ^ 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