tree: https://github.com/hnaz/linux-mm master head: b8280145cf2a894c873fdf91fb2af474c52ac6cc commit: eaadd3a1784064254eb06b36fbd4b653f0228478 [343/435] include/linux/delay.h: replace kernel.h with the necessary inclusions config: riscv-randconfig-r031-20211103 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 264d3b6d4e08401c5b50a85bd76e80b3461d77e6) 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 riscv cross compiling tool for clang build # apt-get install binutils-riscv64-linux-gnu # https://github.com/hnaz/linux-mm/commit/eaadd3a1784064254eb06b36fbd4b653f0228478 git remote add hnaz-mm https://github.com/hnaz/linux-mm git fetch --no-tags hnaz-mm master git checkout eaadd3a1784064254eb06b36fbd4b653f0228478 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=riscv If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All errors (new ones prefixed by >>): >> arch/riscv/lib/delay.c:77:3: error: implicit declaration of function 'cpu_relax' [-Werror,-Wimplicit-function-declaration] cpu_relax(); ^ 1 error generated. vim +/cpu_relax +77 arch/riscv/lib/delay.c 6d60b6ee0c9777 Palmer Dabbelt 2017-07-10 71 6d60b6ee0c9777 Palmer Dabbelt 2017-07-10 72 void __delay(unsigned long cycles) 6d60b6ee0c9777 Palmer Dabbelt 2017-07-10 73 { 6d60b6ee0c9777 Palmer Dabbelt 2017-07-10 74 u64 t0 = get_cycles(); 6d60b6ee0c9777 Palmer Dabbelt 2017-07-10 75 6d60b6ee0c9777 Palmer Dabbelt 2017-07-10 76 while ((unsigned long)(get_cycles() - t0) < cycles) 6d60b6ee0c9777 Palmer Dabbelt 2017-07-10 @77 cpu_relax(); 6d60b6ee0c9777 Palmer Dabbelt 2017-07-10 78 } 24948b7ec0f31d Olof Johansson 2017-11-29 79 EXPORT_SYMBOL(__delay); 6d60b6ee0c9777 Palmer Dabbelt 2017-07-10 80 :::::: The code at line 77 was first introduced by commit :::::: 6d60b6ee0c9777b92c47f6dc8aad1dd90612e4fa RISC-V: Device, timer, IRQs, and the SBI :::::: TO: Palmer Dabbelt <palmer@xxxxxxxxxxx> :::::: CC: Palmer Dabbelt <palmer@xxxxxxxxxxx> --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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