[peterz-queue:objtool/core 3/3] net/mptcp/protocol.o: warning: objtool: mptcp_reset_timer()+0x81: unreachable instruction

[peterz-queue:objtool/core 3/3] net/mptcp/protocol.o: warning: objtool: mptcp_reset_timer()+0x81: unreachable instruction

[kernel test robot]

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CC: kbuild-all(a)lists.01.org
CC: clang-built-linux(a)googlegroups.com

TO: Vasily Gorbik <gor@linux.ibm.com>
CC: Josh Poimboeuf <jpoimboe@redhat.com>

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git objtool/core
head:   c199f64ff93c48a45add92eee4456ffcabfc838e
commit: c199f64ff93c48a45add92eee4456ffcabfc838e [3/3] instrumentation.h: Avoid using inline asm operand modifiers
:::::: branch date: 3 days ago
:::::: commit date: 3 days ago
config: x86_64-randconfig-b001-20210523 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project e84a9b9bb3051c35dea993cdad7b3d2575638f85)
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
        # install x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git/commit/?id=c199f64ff93c48a45add92eee4456ffcabfc838e
        git remote add peterz-queue https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git
        git fetch --no-tags peterz-queue objtool/core
        git checkout c199f64ff93c48a45add92eee4456ffcabfc838e
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

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_reset_timer()+0x81: unreachable instruction
--
>> net/mptcp/crypto.o: warning: objtool: mptcp_crypto_hmac_sha()+0x1af: unreachable instruction

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

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