[kbuild-all] [xiang-linux:erofs/lzma 8/8] fs/erofs/decompressor-lzma.c:140:5: warning: no previous prototype for 'z_erofs_lzma_decompress'

tree: https://git.kernel.org/pub/scm/linux/kernel/git/xiang/linux.git erofs/lzma head: 7b0fd4b18c0c2228c19a84736441fced1bbf0dd6 commit: 7b0fd4b18c0c2228c19a84736441fced1bbf0dd6 [8/8] erofs: lzma compression support config: arc-allyesconfig (attached as .config) compiler: arceb-elf-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/xiang/linux.git/commit/?i... git remote add xiang-linux https://git.kernel.org/pub/scm/linux/kernel/git/xiang/linux.git git fetch --no-tags xiang-linux erofs/lzma git checkout 7b0fd4b18c0c2228c19a84736441fced1bbf0dd6 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arc 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 >>): 140 | int z_erofs_lzma_decompress(struct z_erofs_decompress_req *rq, | ^~~~~~~~~~~~~~~~~~~~~~~ vim +/z_erofs_lzma_decompress +140 fs/erofs/decompressor-lzma.c 139 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org