Re: [PATCH v4 2/2] vdpasim: support doorbell mapping

[kernel test robot]

Hi Longpeng(Mike),

Thank you for the patch! Yet something to improve:

[auto build test ERROR on v6.2]
[also build test ERROR on next-20230227]
[cannot apply to mst-vhost/linux-next linus/master]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Longpeng-Mike/vdpa-support-specify-the-pgprot-of-vq-notification-area/20230227-172516
patch link:    https://lore.kernel.org/r/20230227091857.2406-3-longpeng2%40huawei.com
patch subject: [PATCH v4 2/2] vdpasim: support doorbell mapping
config: arm-randconfig-r046-20230227 (https://download.01.org/0day-ci/archive/20230227/202302272333.Jioo8IEs-lkp@xxxxxxxxx/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project db89896bbbd2251fff457699635acbbedeead27f)
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 arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # https://github.com/intel-lab-lkp/linux/commit/a472c7ad92f68b5b596fd68e1936b2d47fe2ea0b
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Longpeng-Mike/vdpa-support-specify-the-pgprot-of-vq-notification-area/20230227-172516
        git checkout a472c7ad92f68b5b596fd68e1936b2d47fe2ea0b
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Link: https://lore.kernel.org/oe-kbuild-all/202302272333.Jioo8IEs-lkp@xxxxxxxxx/

All errors (new ones prefixed by >>):

>> ld.lld: error: undefined symbol: __bad_xchg
   >>> referenced by cmpxchg.h:110 (arch/arm/include/asm/cmpxchg.h:110)
   >>>               drivers/vdpa/vdpa_sim/vdpa_sim.o:(vdpasim_notify_work) in archive vmlinux.a

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests