On 11/25/19 12:44 AM, kbuild test robot wrote:

Hi John,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on rdma/for-next]
[cannot apply to v5.4 next-20191122]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/John-Hubbard/pin_user_pages-reduced-risk-series-for-Linux-5-5/20191125-125637
base:   https://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma.git for-next
config: arm-randconfig-a001-20191125 (attached as .config)
compiler: arm-linux-gnueabi-gcc (GCC) 7.4.0
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=7.4.0 make.cross ARCH=arm 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <redacted>

All errors (new ones prefixed by >>):

   mm/gup.o: In function `pin_user_pages_remote':

quoted

quoted

mm/gup.c:2528: undefined reference to `get_user_pages_remote'

vim +2528 mm/gup.c

This, and the other (sh) report, is due to !CONFIG_MMU lacking a get_user_pages_remote(), 
but pin_user_pages_remote() needs it for a (temporary) implementation. I'll post the fix, 
in v2.


thanks,
-- 
John Hubbard
NVIDIA