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

On Tue, Jun 15, 2021 at 05:03:40PM +0100, Matthew Wilcox wrote: > On Tue, Jun 15, 2021 at 11:58:36PM +0800, kernel test robot wrote: > > 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 >>): > > > > >> mm/hugetlb.c:1591:9: warning: no previous prototype for function 'hugetlb_basepage_index' [-Wmissing-prototypes] > > pgoff_t hugetlb_basepage_index(struct page *page) > > So clang requires the prototype to still be in scope, while gcc doesn't. > Does one of our clangers want to file a bug about that? I see the exact same warning with GCC 11.1.0: $ curl -LSs https://lore.kernel.org/linux-mm/202106152328.Mh5S48hE-lkp@intel.com/2-a.bin | gzip -d > .config $ make -skj"$(nproc)" ARCH=arm64 CROSS_COMPILE=aarch64-linux- W=1 olddefconfig mm/hugetlb.c mm/hugetlb.c:1591:9: warning: no previous prototype for 'hugetlb_basepage_index' [-Wmissing-prototypes] 1591 | pgoff_t hugetlb_basepage_index(struct page *page) | ^~~~~~~~~~~~~~~~~~~~~~