[PATCH 14/16] objtool: Add arch specific function arch_ftrace_match()

[kernel test robot]

Hi Sathvika,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v5.19 next-20220812]
[cannot apply to powerpc/next powerpc/topic/ppc-kvm masahiroy-kbuild/for-next]
[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#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Sathvika-Vasireddy/objtool-Enable-and-implement-mcount-option-on-powerpc/20220808-200702
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 4e23eeebb2e57f5a28b36221aa776b5a1122dde5
config: x86_64-defconfig (https://download.01.org/0day-ci/archive/20220812/202208121847.XuEAqabf-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-3) 11.3.0
reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/2b03c8be7104e834933d2f5928e69828190e935c
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Sathvika-Vasireddy/objtool-Enable-and-implement-mcount-option-on-powerpc/20220808-200702
        git checkout 2b03c8be7104e834933d2f5928e69828190e935c
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 prepare

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp at intel.com>

All errors (new ones prefixed by >>):

   arch/x86/decode.c: In function 'arch_ftrace_match':
>> arch/x86/decode.c:28:21: error: 'func' undeclared (first use in this function)
      28 |         if (!strcmp(func->name, "__fentry__"))
         |                     ^~~~
   arch/x86/decode.c:28:21: note: each undeclared identifier is reported only once for each function it appears in
   make[5]: *** [tools/build/Makefile.build:96: tools/objtool/arch/x86/decode.o] Error 1
   make[4]: *** [tools/build/Makefile.build:139: arch/x86] Error 2
   make[4]: *** Waiting for unfinished jobs....
   make[3]: *** [Makefile:54: tools/objtool/objtool-in.o] Error 2
   make[2]: *** [Makefile:73: objtool] Error 2
   make[1]: *** [Makefile:1347: tools/objtool] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:219: __sub-make] Error 2
   make: Target 'prepare' not remade because of errors.

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