Hi John,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v5.4]
[cannot apply to mmotm/master rdma/for-next linuxtv-media/master next-20191129]
[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/20191122-092349
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git c74386d50fbaf4a54fd3fe560f1abc709c0cff4b
config: sh-allmodconfig (attached as .config)
compiler: sh4-linux-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=sh 

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

All errors (new ones prefixed by >>):

   mm/gup.c: In function 'pin_user_pages_remote':

quoted

mm/gup.c:2684:9: error: implicit declaration of function '__get_user_pages_remote'; did you mean 'get_user_pages_remote'? [-Werror=implicit-function-declaration]

     return __get_user_pages_remote(tsk, mm, start, nr_pages, gup_flags,
            ^~~~~~~~~~~~~~~~~~~~~~~
            get_user_pages_remote
   cc1: some warnings being treated as errors

vim +2684 mm/gup.c

  2660	
  2661	/**
  2662	 * pin_user_pages_remote() - pin pages of a remote process (task != current)
  2663	 *
  2664	 * Nearly the same as get_user_pages_remote(), except that FOLL_PIN is set. See
  2665	 * get_user_pages_remote() for documentation on the function arguments, because
  2666	 * the arguments here are identical.
  2667	 *
  2668	 * FOLL_PIN means that the pages must be released via unpin_user_page(). Please
  2669	 * see Documentation/vm/pin_user_pages.rst for details.
  2670	 *
  2671	 * This is intended for Case 1 (DIO) in Documentation/vm/pin_user_pages.rst. It
  2672	 * is NOT intended for Case 2 (RDMA: long-term pins).
  2673	 */
  2674	long pin_user_pages_remote(struct task_struct *tsk, struct mm_struct *mm,
  2675				   unsigned long start, unsigned long nr_pages,
  2676				   unsigned int gup_flags, struct page **pages,
  2677				   struct vm_area_struct **vmas, int *locked)
  2678	{
  2679		/* FOLL_GET and FOLL_PIN are mutually exclusive. */
  2680		if (WARN_ON_ONCE(gup_flags & FOLL_GET))
  2681			return -EINVAL;
  2682	
  2683		gup_flags |= FOLL_PIN;

2684		return __get_user_pages_remote(tsk, mm, start, nr_pages, gup_flags,

  2685					       pages, vmas, locked);
  2686	}
  2687	EXPORT_SYMBOL(pin_user_pages_remote);
  2688	

---
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