[kbuild-all] [linux-next:master 9529/10007] mm/hugetlb.c:1591:9: warning: no previous prototype for function 'hugetlb_basepage_index'

tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 19ae1f2bd9c091059f80646604ccef8a1e614f57 commit: 1878ae46bd82ef0403393aee4935f29c07d5848b [9529/10007] mm, futex: fix shared futex pgoff on shmem huge page config: arm64-randconfig-r014-20210615 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 64720f57bea6a6bf033feef4a5751ab9c0c3b401) 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 arm64 cross compiling tool for clang build # apt-get install binutils-aarch64-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commi... git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next master git checkout 1878ae46bd82ef0403393aee4935f29c07d5848b # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64 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 >>): pgoff_t hugetlb_basepage_index(struct page *page) ^ mm/hugetlb.c:1591:1: note: declare 'static' if the function is not intended to be used outside of this translation unit pgoff_t hugetlb_basepage_index(struct page *page) ^ static include/linux/types.h:131:17: note: expanded from macro 'pgoff_t' #define pgoff_t unsigned long ^ 1 warning generated. vim +/hugetlb_basepage_index +1591 mm/hugetlb.c 1590 1592 { 1593 struct page *page_head = compound_head(page); 1594 pgoff_t index = page_index(page_head); 1595 unsigned long compound_idx; 1596 1597 if (compound_order(page_head) >= MAX_ORDER) 1598 compound_idx = page_to_pfn(page) - page_to_pfn(page_head); 1599 else 1600 compound_idx = page - page_head; 1601 1602 return (index << compound_order(page_head)) + compound_idx; 1603 } 1604 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org