On Tue, May 19, 2020 at 10:55:05PM +0200, Borislav Petkov wrote: > On Wed, May 20, 2020 at 01:51:25AM +0800, kbuild test robot wrote: > > tree: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86/mm > > head: bd1de2a7aace4d1d312fb1be264b8fafdb706208 > > commit: 1f6f655e01adebf5bd5e6c3da2e843c104ded051 [1/23] x86/mm: Add a > > x86_has_pat_wp() helper > > config: x86_64-randconfig-r012-20200519 (attached as .config) > > compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project > > 135b877874fae96b4372c8a3fbfaa8ff44ff86e3) > > reproduce: > > wget > > https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O > > ~/bin/make.cross > > chmod +x ~/bin/make.cross > > # install x86_64 cross compiling tool for clang build > > # apt-get install binutils-x86-64-linux-gnu > > git checkout 1f6f655e01adebf5bd5e6c3da2e843c104ded051 > > # save the attached .config to linux build tree > > COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross > > ARCH=x86_64 > > > > If you fix the issue, kindly add following tag as appropriate > > Reported-by: kbuild test robot <[email protected]> > > > > All warnings (new ones prefixed by >>, old ones prefixed by <<): > > > > >> arch/x86/mm/init.c:75:6: warning: no previous prototype for function > > >> 'x86_has_pat_wp' [-Wmissing-prototypes] > > bool x86_has_pat_wp(void) > > ^ > > Triggers with gcc too: > > make W=1 arch/x86/mm/init.o > > ... > > arch/x86/mm/init.c:81:6: warning: no previous prototype for ‘x86_has_pat_wp’ > [-Wmissing-prototypes] > 81 | bool x86_has_pat_wp(void) > | ^~~~~~~~~~~~~~ > > > -Wmissing-prototypes is default off, though, dunno why clang 11 has it > on.
It doesn't: https://godbolt.org/z/rU5_5H I assume this is caused by some sort of internal change to the 0day infrastructure (testing W=1?) I cannot see this without adding W=1 to make at the listed commit with the provided config. Cheers, Nathan > Anyway, something for Benni to fix. CCed and leaving the rest for him as > reference. > > > arch/x86/mm/init.c:75:1: note: declare 'static' if the function is not > > intended to be used outside of this translation unit > > bool x86_has_pat_wp(void) > > ^ > > static > > arch/x86/mm/init.c:866:13: warning: no previous prototype for function > > 'mem_encrypt_free_decrypted_mem' [-Wmissing-prototypes] > > void __weak mem_encrypt_free_decrypted_mem(void) { } > > ^ > > arch/x86/mm/init.c:866:1: note: declare 'static' if the function is not > > intended to be used outside of this translation unit > > void __weak mem_encrypt_free_decrypted_mem(void) { } > > ^ > > static > > 2 warnings generated. > > > > vim +/x86_has_pat_wp +75 arch/x86/mm/init.c > > > > 73 > > 74 /* Check that the write-protect PAT entry is set for > > write-protect */ > > > 75 bool x86_has_pat_wp(void) > > 76 { > > 77 return __pte2cachemode_tbl[_PAGE_CACHE_MODE_WP] == > > _PAGE_CACHE_MODE_WP; > > 78 } > > 79 > > > > --- > > 0-DAY CI Kernel Test Service, Intel Corporation > > https://lists.01.org/hyperkitty/list/[email protected] > > > > -- > Regards/Gruss, > Boris. > > https://people.kernel.org/tglx/notes-about-netiquette >
