net/mptcp/protocol.o: warning: objtool: mptcp_hash()+0x7: unreachable instruction

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

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

Hi Paolo,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   2b14864acbaaf03d9c01982e243a84632524c3ac
commit: 33d41c9cd74c56643a710810703b6bce6eb25efa mptcp: more accurate timeout
date:   4 months ago
config: x86_64-randconfig-a011-20211216 (https://download.01.org/0day-ci/archive/20211217/202112170523.cmGf0o7m-lkp@intel.com/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project dd245bab9fbb364faa1581e4f92ba3119a872fba)
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 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()+0x7: unreachable instruction

---
0-DAY CI Kernel Test Service, Intel Corporation
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