tree:   https://git.kernel.org/pub/scm/linux/kernel/git/andrea/aa.git mapcount_deshare
head:   3e2f198cce0c1792ad71d6d81974b091019b6483
commit: 8dec302e87453234fc7ac1cf4d09e4d577a06cf3 [20/27] mm: gup: pack has_pinned in MMF_HAS_PINNED
config: arm-randconfig-r014-20210511 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project a0fed635fe1701470062495a6ffee1c608f3f1bc)
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
        # install arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # https://git.kernel.org/pub/scm/linux/kernel/git/andrea/aa.git/commit/?id=8dec302e87453234fc7ac1cf4d09e4d577a06cf3
        git remote add aa https://git.kernel.org/pub/scm/linux/kernel/git/andrea/aa.git
        git fetch --no-tags aa mapcount_deshare
        git checkout 8dec302e87453234fc7ac1cf4d09e4d577a06cf3
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=arm 

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 >>):

>> mm/gup.c:2756:3: error: implicit declaration of function 'mm_set_has_pinned_flag' [-Werror,-Wimplicit-function-declaration]
                   mm_set_has_pinned_flag(&current->mm->flags);
                   ^
   1 error generated.


vim +/mm_set_has_pinned_flag +2756 mm/gup.c

  2740	
  2741	static int internal_get_user_pages_fast(unsigned long start,
  2742						unsigned long nr_pages,
  2743						unsigned int gup_flags,
  2744						struct page **pages)
  2745	{
  2746		unsigned long len, end;
  2747		unsigned long nr_pinned;
  2748		int ret;
  2749	
  2750		if (WARN_ON_ONCE(gup_flags & ~(FOLL_WRITE | FOLL_LONGTERM |
  2751					       FOLL_FORCE | FOLL_PIN | FOLL_GET |
  2752					       FOLL_FAST_ONLY)))
  2753			return -EINVAL;
  2754	
  2755		if (gup_flags & FOLL_PIN)
> 2756			mm_set_has_pinned_flag(&current->mm->flags);
  2757	
  2758		if (!(gup_flags & FOLL_FAST_ONLY))
  2759			might_lock_read(&current->mm->mmap_lock);
  2760	
  2761		start = untagged_addr(start) & PAGE_MASK;
  2762		len = nr_pages << PAGE_SHIFT;
  2763		if (check_add_overflow(start, len, &end))
  2764			return 0;
  2765		if (unlikely(!access_ok((void __user *)start, len)))
  2766			return -EFAULT;
  2767	
  2768		nr_pinned = lockless_pages_from_mm(start, end, gup_flags, pages);
  2769		if (nr_pinned == nr_pages || gup_flags & FOLL_FAST_ONLY)
  2770			return nr_pinned;
  2771	
  2772		/* Slow path: try to get the remaining pages with get_user_pages */
  2773		start += nr_pinned << PAGE_SHIFT;
  2774		pages += nr_pinned;
  2775		ret = __gup_longterm_unlocked(start, nr_pages - nr_pinned, gup_flags,
  2776					      pages);
  2777		if (ret < 0) {
  2778			/*
  2779			 * The caller has to unpin the pages we already pinned so
  2780			 * returning -errno is not an option
  2781			 */
  2782			if (nr_pinned)
  2783				return nr_pinned;
  2784			return ret;
  2785		}
  2786		return ret + nr_pinned;
  2787	}
  2788	

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