tree: https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git master head: 7b18c2d1930b99fc2acd4b9499a55f51df2a6678 commit: 37e309a0e8dba5ae589e784f1a6517c4de009937 [388/476] x86/mm/tlb: Privatize cpu_tlbstate config: x86_64-randconfig-a003-20210215 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project c9439ca36342fb6013187d0a69aef92736951476) 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 x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # 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 master git checkout 37e309a0e8dba5ae589e784f1a6517c4de009937 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 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 >>): DEFINE_PER_CPU_ALIGNED(struct tlb_state_shared, cpu_tlbstate_shared); ^ include/linux/percpu-defs.h:151:2: note: expanded from macro 'DEFINE_PER_CPU_ALIGNED' DEFINE_PER_CPU_SECTION(type, name, PER_CPU_ALIGNED_SECTION) \ ^ include/linux/percpu-defs.h:94:9: note: expanded from macro 'DEFINE_PER_CPU_SECTION' extern __PCPU_ATTRS(sec) __typeof__(type) name; \ ^ include/linux/percpu-defs.h:50:26: note: expanded from macro '__PCPU_ATTRS' __percpu __attribute__((section(PER_CPU_BASE_SECTION sec))) \ ^ arch/x86/include/asm/tlbflush.h:157:1: note: previous attribute is here DECLARE_PER_CPU_SHARED_ALIGNED(struct tlb_state_shared, cpu_tlbstate_shared); ^ include/linux/percpu-defs.h:139:2: note: expanded from macro 'DECLARE_PER_CPU_SHARED_ALIGNED' DECLARE_PER_CPU_SECTION(type, name, PER_CPU_SHARED_ALIGNED_SECTION) \ ^ include/linux/percpu-defs.h:88:9: note: expanded from macro 'DECLARE_PER_CPU_SECTION' extern __PCPU_ATTRS(sec) __typeof__(type) name ^ include/linux/percpu-defs.h:50:26: note: expanded from macro '__PCPU_ATTRS' __percpu __attribute__((section(PER_CPU_BASE_SECTION sec))) \ ^ arch/x86/mm/tlb.c:1175:18: warning: variable 'info' is uninitialized when used here [-Wuninitialized] flush_tlb_func(info); ^~~~ arch/x86/mm/tlb.c:1161:29: note: initialize the variable 'info' to silence this warning struct flush_tlb_info *info; ^ = NULL 2 warnings generated. vim +798 arch/x86/mm/tlb.c 797 799 EXPORT_PER_CPU_SYMBOL(cpu_tlbstate_shared); 800 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org