[linux-stable-rc:linux-5.15.y 5773/8107] arch/x86/kernel/head64.o: warning: objtool: __startup_64() falls through to next function startup_64_setup_env()

[linux-stable-rc:linux-5.15.y 5773/8107] arch/x86/kernel/head64.o: warning: objtool: __startup_64() falls through to next function startup_64_setup_env()

[kernel test robot]

BCC: lkp@intel.com
CC: linux-kernel@vger.kernel.org
TO: Kees Cook <keescook@chromium.org>
CC: "Greg Kroah-Hartman" <gregkh@linuxfoundation.org>
CC: Marco Elver <elver@google.com>
CC: Andrew Morton <akpm@linux-foundation.org>
CC: Linux Memory Management List <linux-mm@kvack.org>

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-5.15.y
head:   2c21dc5c2cb635c1b549c0f3eb0ff3d3744be11a
commit: 33db9912ff7c491f839c89a08e98f755aa09598f [5773/8107] ubsan: remove CONFIG_UBSAN_OBJECT_SIZE
config: x86_64-buildonly-randconfig-r002-20220627 (https://download.01.org/0day-ci/archive/20220627/202206272327.X6yeZ9sN-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 016342e319fd31e41cf5ed16a6140a8ea2de74dd)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git/commit/?id=33db9912ff7c491f839c89a08e98f755aa09598f
        git remote add linux-stable-rc https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git
        git fetch --no-tags linux-stable-rc linux-5.15.y
        git checkout 33db9912ff7c491f839c89a08e98f755aa09598f
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash arch/x86/

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

All warnings (new ones prefixed by >>):

>> arch/x86/kernel/head64.o: warning: objtool: __startup_64() falls through to next function startup_64_setup_env()

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp