[dhowells-fs:afs-fixes 5/5] ERROR: modpost: "unmap_mapping_pages" [fs/afs/kafs.ko] undefined!

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git afs-fixes
head:   57ee305fb8ea4a4901e34c8c5fdc8856dbaea16d
commit: 57ee305fb8ea4a4901e34c8c5fdc8856dbaea16d [5/5] afs: Fix mmap coherency vs 3rd-party changes
config: x86_64-randconfig-a016-20210903 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git/commit/?id=57ee305fb8ea4a4901e34c8c5fdc8856dbaea16d
        git remote add dhowells-fs https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git
        git fetch --no-tags dhowells-fs afs-fixes
        git checkout 57ee305fb8ea4a4901e34c8c5fdc8856dbaea16d
        # save the attached .config to linux build tree
        make W=1 ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>, old ones prefixed by <<):

>> ERROR: modpost: "unmap_mapping_pages" [fs/afs/kafs.ko] undefined!

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0-DAY CI Kernel Test Service, Intel Corporation
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Attachment: .config.gz
Description: application/gzip