tree: https://git.kernel.org/pub/scm/linux/kernel/git/djbw/nvdimm.git libnvdimm-pending head: bb12557751a16ec04d801b01492257f720e4718e commit: b00239d425d5c3c3d20f62bb1180905c0d133ab3 [297/299] x86, powerpc: Rename memcpy_mcsafe() to copy_mc_to_{user,kernel}() config: powerpc-allnoconfig (attached as .config) compiler: powerpc-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout b00239d425d5c3c3d20f62bb1180905c0d133ab3 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day GCC_VERSION=9.3.0 make.cross ARCH=powerpc If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>, old ones prefixed by <<): In file included from include/linux/uaccess.h:11, from include/linux/crypto.h:21, from include/crypto/hash.h:11, from include/linux/uio.h:10, from include/linux/socket.h:8, from include/linux/compat.h:15, from arch/powerpc/kernel/asm-offsets.c:14: 331 | copy_mc_to_kernel(void *to, const void *from, unsigned long size) | ^~~~~~~~~~~~~~~~~ In file included from include/linux/bitmap.h:9, from include/linux/cpumask.h:12, from include/linux/workqueue.h:15, from include/linux/rhashtable-types.h:15, from include/linux/ipc.h:7, from include/uapi/linux/sem.h:5, from include/linux/sem.h:5, from include/linux/compat.h:14, from arch/powerpc/kernel/asm-offsets.c:14: include/linux/string.h:176:15: note: previous definition of 'copy_mc_to_kernel' was here 176 | unsigned long copy_mc_to_kernel(void *dst, const void *src, size_t cnt) | ^~~~~~~~~~~~~~~~~ In file included from include/linux/uaccess.h:11, from include/linux/crypto.h:21, from include/crypto/hash.h:11, from include/linux/uio.h:10, from include/linux/socket.h:8, from include/linux/compat.h:15, from arch/powerpc/kernel/asm-offsets.c:14: arch/powerpc/include/asm/uaccess.h: In function 'copy_mc_to_kernel': arch/powerpc/include/asm/uaccess.h:333:9: error: implicit declaration of function 'copy_mc_generic' [-Werror=implicit-function-declaration] 333 | return copy_mc_generic(to, from, size); | ^~~~~~~~~~~~~~~ cc1: some warnings being treated as errors make[2]: *** [scripts/Makefile.build:100: arch/powerpc/kernel/asm-offsets.s] Error 1 make[2]: Target '__build' not remade because of errors. make[1]: *** [Makefile:1142: prepare0] Error 2 make[1]: Target 'prepare' not remade because of errors. make: *** [Makefile:180: sub-make] Error 2 vim +/copy_mc_to_kernel +331 arch/powerpc/include/asm/uaccess.h 326 327 extern unsigned long __copy_tofrom_user(void __user *to, 328 const void __user *from, unsigned long size); 329 330 static inline unsigned long 332 { 333 return copy_mc_generic(to, from, size); 334 } 335 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org