net/mptcp/protocol.o: warning: objtool: mptcp_sendmsg_frag()+0x5ac: unreachable instruction

net/mptcp/protocol.o: warning: objtool: mptcp_sendmsg_frag()+0x5ac: unreachable instruction

[kernel test robot]

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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:   fe91c4725aeed35023ba4f7a1e1adfebb6878c23
commit: ff5a0b421cb23bf6b2898939ffef5b683045d9d3 mptcp: faster active backup recovery
date:   3 months ago
config: x86_64-randconfig-a003-20211103 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 264d3b6d4e08401c5b50a85bd76e80b3461d77e6)
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=ff5a0b421cb23bf6b2898939ffef5b683045d9d3
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout ff5a0b421cb23bf6b2898939ffef5b683045d9d3
        # save the attached .config 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_sendmsg_frag()+0x5ac: unreachable instruction

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

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