Re: Re: fs/proc/task_mmu: Implement IOCTL for efficient page table scanning

[kernel test robot <lkp@intel.com>]

Hi Michał,

kernel test robot noticed the following build errors:

[auto build test ERROR on akpm-mm/mm-everything]
[also build test ERROR on linus/master v6.5-rc2 next-20230720]
[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/Micha-Miros-aw/Re-fs-proc-task_mmu-Implement-IOCTL-for-efficient-page-table-scanning/20230721-033050
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/a0b5c6776b2ed91f78a7575649f8b100e58bd3a9.1689881078.git.mirq-linux%40rere.qmqm.pl
patch subject: Re: fs/proc/task_mmu: Implement IOCTL for efficient page table scanning
config: i386-randconfig-r022-20230720 (https://download.01.org/0day-ci/archive/20230721/202307211337.5dwCMeHb-lkp@intel.com/config)
compiler: clang version 15.0.7 (https://github.com/llvm/llvm-project.git 8dfdcc7b7bf66834a761bd8de445840ef68e4d1a)
reproduce: (https://download.01.org/0day-ci/archive/20230721/202307211337.5dwCMeHb-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202307211337.5dwCMeHb-lkp@intel.com/

All errors (new ones prefixed by >>):

>> fs/proc/task_mmu.c:1921:6: error: call to undeclared function 'userfaultfd_wp_async'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]
           if (userfaultfd_wp_async(vma) && userfaultfd_wp_use_markers(vma))
               ^
>> fs/proc/task_mmu.c:2200:12: error: call to undeclared function 'uffd_wp_range'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]
           int err = uffd_wp_range(vma, addr, end - addr, true);
                     ^
   2 errors generated.


vim +/userfaultfd_wp_async +1921 fs/proc/task_mmu.c

  1913	
  1914	static int pagemap_scan_test_walk(unsigned long start, unsigned long end,
  1915					  struct mm_walk *walk)
  1916	{
  1917		struct pagemap_scan_private *p = walk->private;
  1918		struct vm_area_struct *vma = walk->vma;
  1919		unsigned long vma_category = 0;
  1920	
> 1921		if (userfaultfd_wp_async(vma) && userfaultfd_wp_use_markers(vma))
  1922			vma_category |= PAGE_IS_WPASYNC;
  1923		else if (p->arg.flags & PM_SCAN_CHECK_WPASYNC)
  1924			return -EPERM;
  1925	
  1926		if (vma->vm_flags & VM_PFNMAP)
  1927			return 1;
  1928	
  1929		if (!pagemap_scan_is_interesting_vma(vma_category, p))
  1930			return 1;
  1931	
  1932		p->cur_vma_category = vma_category;
  1933		return 0;
  1934	}
  1935	

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