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 <l...@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.
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-...@lists.01.org
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
