tree: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-4.14.y head: db507a48851781973fbcaf77b9185543a56bd4b2 commit: a1fe39636e6fb60c8fe7e3b87a32cb561585399f [1552/3419] powerpc/64s: flush L1D after user accesses config: powerpc-ps3_defconfig (attached as .config) compiler: powerpc64-linux-gcc (GCC) 7.5.0 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/stable/linux-stable-rc.gi... git remote add linux-stable-rc https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git git fetch --no-tags linux-stable-rc linux-4.14.y git checkout a1fe39636e6fb60c8fe7e3b87a32cb561585399f # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-7.5.0 make.cross ARCH=powerpc If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): In file included from arch/powerpc/include/asm/book3s/64/mmu-hash.h:24:0, from arch/powerpc/include/asm/book3s/64/mmu.h:30, from arch/powerpc/include/asm/mmu.h:305, from arch/powerpc/include/asm/lppaca.h:36, from arch/powerpc/include/asm/paca.h:21, from arch/powerpc/include/asm/current.h:16, from include/linux/sched.h:12, from arch/powerpc/kernel/setup_64.c:17: arch/powerpc/include/asm/book3s/64/pgtable.h:1218:15: error: type qualifiers ignored on function return type [-Werror=ignored-qualifiers] static inline const int pud_pfn(pud_t pud) ^~~~~ In file included from arch/powerpc/include/asm/kup.h:10:0, from arch/powerpc/include/asm/uaccess.h:10, from include/linux/uaccess.h:14, from include/asm-generic/termios-base.h:8, from arch/powerpc/include/asm/termios.h:20, from include/uapi/linux/termios.h:6, from include/linux/tty.h:7, from arch/powerpc/kernel/setup_64.c:27: arch/powerpc/include/asm/book3s/64/kup-radix.h:5:1: error: data definition has no type or storage class [-Werror] DECLARE_STATIC_KEY_FALSE(uaccess_flush_key); ^~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/include/asm/book3s/64/kup-radix.h:5:1: error: type defaults to 'int' in declaration of 'DECLARE_STATIC_KEY_FALSE' [-Werror=implicit-int] arch/powerpc/include/asm/book3s/64/kup-radix.h:5:1: error: parameter names (without types) in function declaration [-Werror] arch/powerpc/include/asm/book3s/64/kup-radix.h: In function 'prevent_user_access': arch/powerpc/include/asm/book3s/64/kup-radix.h:18:6: error: implicit declaration of function 'static_branch_unlikely' [-Werror=implicit-function-declaration] if (static_branch_unlikely(&uaccess_flush_key)) ^~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/include/asm/book3s/64/kup-radix.h:18:30: error: 'uaccess_flush_key' undeclared (first use in this function); did you mean 'do_uaccess_flush'? if (static_branch_unlikely(&uaccess_flush_key)) ^~~~~~~~~~~~~~~~~ do_uaccess_flush arch/powerpc/include/asm/book3s/64/kup-radix.h:18:30: note: each undeclared identifier is reported only once for each function it appears in arch/powerpc/kernel/setup_64.c: At top level: arch/powerpc/kernel/setup_64.c:133:13: error: no previous declaration for 'check_smt_enabled' [-Werror=missing-declarations] void __init check_smt_enabled(void) ^~~~~~~~~~~~~~~~~ arch/powerpc/kernel/setup_64.c:273:13: error: no previous declaration for 'early_setup' [-Werror=missing-declarations] void __init early_setup(unsigned long dt_ptr) ^~~~~~~~~~~ arch/powerpc/kernel/setup_64.c:343:6: error: no previous declaration for 'early_setup_secondary' [-Werror=missing-declarations] void early_setup_secondary(void) ^~~~~~~~~~~~~~~~~~~~~ arch/powerpc/kernel/setup_64.c:494:13: error: no previous declaration for 'initialize_cache_info' [-Werror=missing-declarations] void __init initialize_cache_info(void) ^~~~~~~~~~~~~~~~~~~~~ arch/powerpc/kernel/setup_64.c:580:13: error: no previous declaration for 'irqstack_early_init' [-Werror=missing-declarations] void __init irqstack_early_init(void) ^~~~~~~~~~~~~~~~~~~ arch/powerpc/kernel/setup_64.c:648:13: error: no previous declaration for 'emergency_stack_init' [-Werror=missing-declarations] void __init emergency_stack_init(void) ^~~~~~~~~~~~~~~~~~~~ arch/powerpc/kernel/setup_64.c:858:6: error: no previous declaration for 'entry_flush_enable' [-Werror=missing-declarations] void entry_flush_enable(bool enable) ^~~~~~~~~~~~~~~~~~ void uaccess_flush_enable(bool enable) ^~~~~~~~~~~~~~~~~~~~ In file included from include/linux/serial_8250.h:14:0, from arch/powerpc/kernel/setup_64.c:33: include/linux/serial_core.h:391:19: error: 'earlycon_init_is_deferred' defined but not used [-Werror=unused-const-variable=] static const bool earlycon_init_is_deferred; ^~~~~~~~~~~~~~~~~~~~~~~~~ cc1: all warnings being treated as errors vim +/uaccess_flush_enable +870 arch/powerpc/kernel/setup_64.c 869 871 { 872 if (enable) { 873 do_uaccess_flush_fixups(enabled_flush_types); 874 static_branch_enable(&uaccess_flush_key); 875 on_each_cpu(do_nothing, NULL, 1); 876 } else { 877 static_branch_disable(&uaccess_flush_key); 878 do_uaccess_flush_fixups(L1D_FLUSH_NONE); 879 } 880 881 uaccess_flush = enable; 882 } 883 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org