[kbuild-all] arch/mips/boot/compressed/ashldi3.c:9:19: warning: no previous prototype for '__ashldi3'

Hi Krzysztof, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 009c9aa5be652675a06d5211e1640e02bbb1c33d commit: 84a0124a9d715d844675c8cfbe5bbc9147121f73 MIPS: ralink: define stubs for clk_set_parent to fix compile testing date: 3 months ago config: mips-randconfig-r021-20210615 (attached as .config) compiler: mipsel-linux-gcc (GCC) 9.3.0 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/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 84a0124a9d715d844675c8cfbe5bbc9147121f73 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=mips 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 >>): 9 | long long notrace __ashldi3(long long u, word_type b) | ^~~~~~~~~ -- 5 | unsigned int notrace __bswapsi2(unsigned int u) | ^~~~~~~~~~ --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org