[cxl:pending 9/46] drivers/cxl/pci.o: warning: objtool: cxl_pci_mbox_send()+0x452: unreachable instruction

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

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CC: Alison Schofield <alison.schofield@intel.com>
CC: Vishal Verma <vishal.l.verma@intel.com>
CC: Ira Weiny <ira.weiny@intel.com>
CC: Ben Widawsky <ben.widawsky@intel.com>
CC: Dan Williams <dan.j.williams@intel.com>
CC: linux-kernel@vger.kernel.org
TO: Dan Williams <dan.j.williams@intel.com>
CC: Jonathan Cameron <Jonathan.Cameron@huawei.com>
CC: Ben Widawsky <ben.widawsky@intel.com>

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl.git pending
head:   44a88683e4a9db51bf83dcd08dc7b0af37e4b0f9
commit: b64955a92929346f16df058ad2bb53630eb80466 [9/46] cxl/mbox: Introduce the mbox_send operation
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/cxl/cxl.git/commit/?id=b64955a92929346f16df058ad2bb53630eb80466
        git remote add cxl https://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl.git
        git fetch --no-tags cxl pending
        git checkout b64955a92929346f16df058ad2bb53630eb80466
        # 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 drivers/ kernel// mm//

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 >>):

>> drivers/cxl/pci.o: warning: objtool: cxl_pci_mbox_send()+0x452: 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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