Hi Trond,

I love your patch! Yet something to improve:

[auto build test ERROR on nfs/linux-next]
[cannot apply to v5.1-rc1 next-20190318]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Trond-Myklebust/Updates-for-pNFS-flexfiles/20190302-165857
base:   git://git.linux-nfs.org/projects/trondmy/linux-nfs.git linux-next
config: arm-shmobile_defconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        GCC_VERSION=7.2.0 make.cross ARCH=arm 

All errors (new ones prefixed by >>):

   fs/nfs/flexfilelayout/flexfilelayout.o: In function `ff_layout_send_layouterror':
>> flexfilelayout.c:(.text+0x338c): undefined reference to `nfs42_proc_layouterror'

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation