Re: [PATCH v9 2/3] fs/proc/task_mmu: Implement IOCTL to get and/or the clear info about PTEs

[kernel test robot]

Hi Muhammad,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on shuah-kselftest/fixes]
[also build test ERROR on linus/master v6.2-rc6 next-20230131]
[cannot apply to shuah-kselftest/next]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Muhammad-Usama-Anjum/userfaultfd-Add-UFFD-WP-Async-support/20230131-163537
base:   https://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest.git fixes
patch link:    https://lore.kernel.org/r/20230131083257.3302830-3-usama.anjum%40collabora.com
patch subject: [PATCH v9 2/3] fs/proc/task_mmu: Implement IOCTL to get and/or the clear info about PTEs
config: arc-defconfig (https://download.01.org/0day-ci/archive/20230131/202301312359.8WtBkSkQ-lkp@xxxxxxxxx/config)
compiler: arc-elf-gcc (GCC) 12.1.0
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
        # https://github.com/intel-lab-lkp/linux/commit/11677b6b7fda958031115ea40aa219fc32c7dea4
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Muhammad-Usama-Anjum/userfaultfd-Add-UFFD-WP-Async-support/20230131-163537
        git checkout 11677b6b7fda958031115ea40aa219fc32c7dea4
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arc olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arc SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

   fs/proc/task_mmu.c: In function 'pagemap_scan_pmd_entry':
>> fs/proc/task_mmu.c:1927:17: error: implicit declaration of function 'uffd_wp_range' [-Werror=implicit-function-declaration]
    1927 |                 uffd_wp_range(walk->mm, vma, start, addr - start, true);
         |                 ^~~~~~~~~~~~~
   cc1: some warnings being treated as errors


vim +/uffd_wp_range +1927 fs/proc/task_mmu.c

  1915	
  1916		pte = pte_offset_map_lock(vma->vm_mm, pmd, start, &ptl);
  1917		if (IS_GET_OP(p)) {
  1918			for (addr = start; addr < end; pte++, addr += PAGE_SIZE) {
  1919				ret = pagemap_scan_output(!is_pte_uffd_wp(*pte), vma->vm_file,
  1920							  pte_present(*pte), is_swap_pte(*pte), p, addr, 1);
  1921				if (ret)
  1922					break;
  1923			}
  1924		}
  1925		pte_unmap_unlock(pte - 1, ptl);
  1926		if ((!ret || ret == -ENOSPC) && IS_WP_ENGAGE_OP(p) && (addr - start))
> 1927			uffd_wp_range(walk->mm, vma, start, addr - start, true);
  1928	
  1929		cond_resched();
  1930		return ret;
  1931	}
  1932	

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https://github.com/intel/lkp-tests