tree: https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git perf/hybrid head: d8d36d49b08781039deaf70e63f661cf55d28d2a commit: bfe6f62d7a8f3927461ac9615867b3654d438a02 [3/26] x86/cpu: Add helper function to get the type of the current hybrid CPU config: i386-randconfig-m031-20210414 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git/commit/?... git remote add peterz-queue https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git git fetch --no-tags peterz-queue perf/hybrid git checkout bfe6f62d7a8f3927461ac9615867b3654d438a02 # save the attached .config to linux build tree make W=1 W=1 ARCH=i386 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 >>): 95 | u8 get_this_hybrid_cpu_type(void) | ^~~~~~~~~~~~~~~~~~~~~~~~ vim +/get_this_hybrid_cpu_type +95 arch/x86/kernel/cpu/intel.c 88 89 /** 90 * get_this_hybrid_cpu_type() - Get the type of this hybrid CPU 91 * 92 * Returns the CPU type [31:24] (i.e., Atom or Core) of a CPU in 93 * a hybrid processor. If the processor is not hybrid, returns 0. 94 */ 96 { 97 if (!cpu_feature_enabled(X86_FEATURE_HYBRID_CPU)) 98 return 0; 99 100 return cpuid_eax(0x0000001a) >> X86_HYBRID_CPU_TYPE_ID_SHIFT; 101 } 102 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org