8:12 a.m.
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(a)gmail.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(a)intel.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
>
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Thanks,
~Nick Desaulniers