tree: https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git for-next/cast-function head: eed09ebd6f47aeb92b3fe3b8d338b2a55e534928 commit: f9d45e65ef7f67bdb39c15d09bc6021f197d893e [1/3] ftrace: Fix -Wcast-function-type warnings on powerpc64 config: nds32-randconfig-r011-20211013 (attached as .config) compiler: nds32le-linux-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/gustavoars/linux.git/comm... git remote add gustavoars https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git git fetch --no-tags gustavoars for-next/cast-function git checkout f9d45e65ef7f67bdb39c15d09bc6021f197d893e # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=nds32 SHELL=/bin/bash 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 >>): nds32le-linux-ld: kernel/trace/ftrace.o: in function `update_ftrace_function': ftrace.c:(.text+0x140): undefined reference to `ftrace_ops_list_func' nds32le-linux-ld: ftrace.c:(.text+0x168): undefined reference to `ftrace_ops_list_func' nds32le-linux-ld: ftrace.c:(.text+0x16c): undefined reference to `ftrace_ops_list_func' --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org