Hi Chuck,

[FYI, it's a private test report for your RFC patch.]
[auto build test ERROR on nfs/linux-next]
[also build test ERROR on nfsd/nfsd-next v5.10-rc6]
[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]

url:    https://github.com/0day-ci/linux/commits/Chuck-Lever/xprtrdma-Fix-XDRBUF_SPARSE_PAGES-support/20201205-061457
base:   git://git.linux-nfs.org/projects/trondmy/linux-nfs.git linux-next
config: ia64-defconfig (attached as .config)
compiler: ia64-linux-gcc (GCC) 9.3.0
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://github.com/0day-ci/linux/commit/a30761dcbb486899f0ebacc6364ff181c089ddfb
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Chuck-Lever/xprtrdma-Fix-XDRBUF_SPARSE_PAGES-support/20201205-061457
        git checkout a30761dcbb486899f0ebacc6364ff181c089ddfb
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=ia64 

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

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

>> ERROR: modpost: "xdr_buf_pagecount" [net/sunrpc/xprtrdma/rpcrdma.ko] undefined!

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