On 11/18/20 11:52 AM, Nick Desaulniers wrote: > On Wed, Nov 18, 2020 at 11:22 AM Dan Williams <dan.j.williams@xxxxxxxxx> wrote: >> >> On Wed, Nov 18, 2020 at 4:27 AM kernel test robot <lkp@xxxxxxxxx> wrote: >>> >>> tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master >>> head: 2052923327794192c5d884623b5ee5fec1867bda >>> commit: d106ad47e292fde47fc09e16a2ddc13609ff2ad1 [5868/6773] mm-fix-phys_to_target_node-and-memory_add_physaddr_to_nid-exports-v4 >>> config: powerpc64-randconfig-r026-20201118 (attached as .config) > > ^ randconfig > >>> compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project b2613fb2f0f53691dd0211895afbb9413457fca7) >>> reproduce (this is a W=1 build): > > ^ W=1 > >>> wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross >>> chmod +x ~/bin/make.cross >>> # install powerpc64 cross compiling tool for clang build >>> # apt-get install binutils-powerpc64-linux-gnu >>> # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=d106ad47e292fde47fc09e16a2ddc13609ff2ad1 >>> 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 d106ad47e292fde47fc09e16a2ddc13609ff2ad1 >>> # save the attached .config to linux build tree >>> COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc64 >> >> I get: >> >> Makefile:597: arch/powerpc64/Makefile: No such file or directory >> make[1]: *** No rule to make target 'arch/powerpc64/Makefile'. Stop. >> make: *** [Makefile:712: include/config/auto.conf.cmd] Error 2 >> >> ...changing it to ARCH=powerpc I get: >> >> Assembler messages: >> Fatal error: invalid listing option `3' >> clang: error: assembler command failed with exit code 1 (use -v to see >> invocation) >> make[1]: *** [scripts/Makefile.build:283: scripts/mod/empty.o] Error 1 >> make[1]: *** Waiting for unfinished jobs.... >> make: *** [Makefile:1199: prepare0] Error 2 >> >> This is on a Fedora 31 host. >> >>> >>> If you fix the issue, kindly add following tag as appropriate >>> Reported-by: kernel test robot <lkp@xxxxxxxxx> >>> >>> All warnings (new ones prefixed by >>): >>> >>>>> arch/powerpc/mm/mem.c:91:12: warning: no previous prototype for function 'create_section_mapping' [-Wmissing-prototypes] >>> int __weak create_section_mapping(unsigned long start, unsigned long end, >>> ^ >>> arch/powerpc/mm/mem.c:91:1: note: declare 'static' if the function is not intended to be used outside of this translation unit >>> int __weak create_section_mapping(unsigned long start, unsigned long end, >>> ^ >>> static >>> 1 warning generated. >> >> I do not see these errors with gcc. >> >> I feel like clang errors should be flagged / de-emphasized when the >> same error does not appear on gcc. > > Note this is a W=1 build. For this warning, you either need to mark > functions as having static linkage, or provide a prototype in a header > so that callers know the correct function signature. Yes, so with gcc, that gave me something like 109 missing prototype warnings -- including one for 'create_section_mapping'. -- ~Randy
