[pci:review/vga 1/9] drivers/pci/vgaarb.o: warning: objtool: vga_arb_read()+0x38a: unreachable instruction

[pci:review/vga 1/9] drivers/pci/vgaarb.o: warning: objtool: vga_arb_read()+0x38a: unreachable instruction

[kernel test robot]

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TO: Bjorn Helgaas <helgaas@kernel.org>

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git review/vga
head:   d3ff98e99536cd76e77696889600ee06fe5253b2
commit: e7d0ca67cfb1c61feb5fed7632cedb69e7ccdd79 [1/9] PCI/VGA: Move vgaarb to drivers/pci
config: x86_64-randconfig-r004-20210723 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 9625ca5b602616b2f5584e8a49ba93c52c141e40)
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/helgaas/pci.git/commit/?id=e7d0ca67cfb1c61feb5fed7632cedb69e7ccdd79
        git remote add pci https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git
        git fetch --no-tags pci review/vga
        git checkout e7d0ca67cfb1c61feb5fed7632cedb69e7ccdd79
        # save the attached .config to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross O=build_dir ARCH=x86_64 SHELL=/bin/bash block// drivers/

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/pci/vgaarb.o: warning: objtool: vga_arb_read()+0x38a: 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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