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Date: Tue, 19 May 2020 15:12:24 -0700 From: Nick Desaulniers <ndesaulniers@...gle.com> To: Masahiro Yamada <masahiroy@...nel.org>, Philip Li <philip.li@...el.com> Cc: Borislav Petkov <bp@...en8.de>, kbuild test robot <lkp@...el.com>, Christoph Hellwig <hch@....de>, kbuild-all@...ts.01.org, clang-built-linux <clang-built-linux@...glegroups.com>, LKML <linux-kernel@...r.kernel.org>, "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>, Benjamin Thiel <b.thiel@...teo.de>, Nathan Chancellor <natechancellor@...il.com> Subject: Re: [tip:x86/mm 1/23] arch/x86/mm/init.c:75:6: warning: no previous prototype for function 'x86_has_pat_wp' Masahiro and Philip, We're seeing a bunch of -Wmissing-prototypes warnings from 0day bot suddenly today. Did something change on the Kbuild or 0day bot side? On Tue, May 19, 2020 at 2:25 PM Nathan Chancellor <natechancellor@...il.com> wrote: > > 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 <lkp@...el.com> > > > > > > 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/kbuild-all@lists.01.org > > > > > > > > -- > > Regards/Gruss, > > Boris. > > > > https://people.kernel.org/tglx/notes-about-netiquette > > > > -- > You received this message because you are subscribed to the Google Groups "Clang Built Linux" group. > To unsubscribe from this group and stop receiving emails from it, send an email to clang-built-linux+unsubscribe@...glegroups.com. > To view this discussion on the web visit https://groups.google.com/d/msgid/clang-built-linux/20200519212541.GA3580016%40ubuntu-s3-xlarge-x86. -- Thanks, ~Nick Desaulniers
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