net/mptcp/protocol.o: warning: objtool: mptcp_hash()+0x2: unreachable instruction

net/mptcp/protocol.o: warning: objtool: mptcp_hash()+0x2: unreachable instruction

[kernel test robot]

CC: linux-kernel@vger.kernel.org
TO: Paolo Abeni <pabeni@redhat.com>
CC: Mat Martineau <mathew.j.martineau@linux.intel.com>

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   12119cfa1052d512a92524e90ebee85029a918f8
commit: 33d41c9cd74c56643a710810703b6bce6eb25efa mptcp: more accurate timeout
date:   4 months ago
config: x86_64-randconfig-a001-20211204 (https://download.01.org/0day-ci/archive/20211205/202112050228.NJAd4z9O-lkp@intel.com/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 5f1d1854eb1450d352663ee732235893c5782237)
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/torvalds/linux.git/commit/?id=33d41c9cd74c56643a710810703b6bce6eb25efa
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 33d41c9cd74c56643a710810703b6bce6eb25efa
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/mtd/ fs// kernel/ net/

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

All warnings (new ones prefixed by >>):

>> net/mptcp/protocol.o: warning: objtool: mptcp_hash()+0x2: unreachable instruction

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