Re: [PATCH 12/21] objtool: Add CONFIG_CFI_CLANG support

[kernel test robot <lkp@intel.com>]

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Hi Josh,

I love your patch! Yet something to improve:

[auto build test ERROR on tip/master]
[also build test ERROR on linus/master v5.11-rc3 next-20210115]
[cannot apply to xen-tip/linux-next tip/x86/core]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Josh-Poimboeuf/objtool-vmlinux-o-and-CLANG-LTO-support/20210115-125439
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 2c2adbc40b7276518921864053f3c02034b2290f
config: x86_64-rhel (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/0day-ci/linux/commit/8bd968235f05d3e12d27c48feea19efdb7abeca6
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Josh-Poimboeuf/objtool-vmlinux-o-and-CLANG-LTO-support/20210115-125439
        git checkout 8bd968235f05d3e12d27c48feea19efdb7abeca6
        # save the attached .config to linux build tree
        make W=1 ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

Note: it may well be a FALSE warning. FWIW you are at least aware of it now.
http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings

All errors (new ones prefixed by >>):

   elf.c: In function 'read_symbols':
   elf.c:414:8: error: unused variable 'coldstr' [-Werror=unused-variable]
     414 |  char *coldstr;
         |        ^~~~~~~
   elf.c: In function 'elf_open_read':
>> elf.c:640:12: error: 'sym' may be used uninitialized in this function [-Werror=maybe-uninitialized]
     640 |      sym = find_func_by_offset(sym->sec,
         |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     641 |           reloc->addend);
         |           ~~~~~~~~~~~~~~
   elf.c:637:27: note: 'sym' was declared here
     637 |     struct symbol *func, *sym;
         |                           ^~~
   cc1: all warnings being treated as errors
   make[4]: *** [tools/build/Makefile.build:96: tools/objtool/elf.o] Error 1
   make[3]: *** [Makefile:59: tools/objtool/objtool-in.o] Error 2
--
   elf.c: In function 'read_symbols':
   elf.c:414:8: error: unused variable 'coldstr' [-Werror=unused-variable]
     414 |  char *coldstr;
         |        ^~~~~~~
   elf.c: In function 'elf_open_read':
>> elf.c:640:12: error: 'sym' may be used uninitialized in this function [-Werror=maybe-uninitialized]
     640 |      sym = find_func_by_offset(sym->sec,
         |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     641 |           reloc->addend);
         |           ~~~~~~~~~~~~~~
   elf.c:637:27: note: 'sym' was declared here
     637 |     struct symbol *func, *sym;
         |                           ^~~
   cc1: all warnings being treated as errors
   make[4]: *** [tools/build/Makefile.build:96: tools/objtool/elf.o] Error 1
   make[3]: *** [Makefile:59: tools/objtool/objtool-in.o] Error 2
   make[2]: *** [Makefile:68: objtool] Error 2
   make[1]: *** [Makefile:1931: tools/objtool] Error 2
   make[1]: Target 'modules_prepare' not remade because of errors.
   make: *** [Makefile:185: __sub-make] Error 2
   make: Target 'modules_prepare' not remade because of errors.
--
   elf.c: In function 'read_symbols':
   elf.c:414:8: error: unused variable 'coldstr' [-Werror=unused-variable]
     414 |  char *coldstr;
         |        ^~~~~~~
   elf.c: In function 'elf_open_read':
>> elf.c:640:12: error: 'sym' may be used uninitialized in this function [-Werror=maybe-uninitialized]
     640 |      sym = find_func_by_offset(sym->sec,
         |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     641 |           reloc->addend);
         |           ~~~~~~~~~~~~~~
   elf.c:637:27: note: 'sym' was declared here
     637 |     struct symbol *func, *sym;
         |                           ^~~
   cc1: all warnings being treated as errors
   make[4]: *** [tools/build/Makefile.build:96: tools/objtool/elf.o] Error 1
   make[4]: *** Waiting for unfinished jobs....
   make[3]: *** [Makefile:59: tools/objtool/objtool-in.o] Error 2
   make[2]: *** [Makefile:68: objtool] Error 2
   make[1]: *** [Makefile:1931: tools/objtool] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:185: __sub-make] Error 2
   make: Target 'prepare' not remade because of errors.

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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