Hi John,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on rdma/for-next]
[also build test WARNING on linus/master v5.5-rc2 next-20191216]
[cannot apply to mmotm/master vfio/next]
[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/mm-gup-track-dma-pinned-pages-FOLL_PIN/20191212-013238
base:   https://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma.git for-next
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.1-104-gf934193-dirty
        make ARCH=x86_64 allmodconfig
        make C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'

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


sparse warnings: (new ones prefixed by >>)

quoted

mm/gup.c:78:26: sparse: sparse: symbol 'try_pin_compound_head' was not declared. Should it be static?

Please review and possibly fold the followup patch.

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0-DAY kernel test infrastructure                 Open Source Technology Center
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