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: arc-randconfig-r035-20230720 (https://download.01.org/0day-ci/archive/20230721/202307211030.2CJH6TkM-lkp@intel.com/config)
compiler: arceb-elf-gcc (GCC) 12.3.0
reproduce: (https://download.01.org/0day-ci/archive/20230721/202307211030.2CJH6TkM-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/202307211030.2CJH6TkM-lkp@intel.com/

All errors (new ones prefixed by >>):

   fs/proc/task_mmu.c: In function 'pagemap_scan_test_walk':
   fs/proc/task_mmu.c:1921:13: error: implicit declaration of function 'userfaultfd_wp_async'; did you mean 'userfaultfd_wp'? [-Werror=implicit-function-declaration]
    1921 |         if (userfaultfd_wp_async(vma) && userfaultfd_wp_use_markers(vma))
         |             ^~~~~~~~~~~~~~~~~~~~
         |             userfaultfd_wp
   fs/proc/task_mmu.c: In function 'pagemap_scan_pte_hole':
>> fs/proc/task_mmu.c:2200:19: error: implicit declaration of function 'uffd_wp_range' [-Werror=implicit-function-declaration]
    2200 |         int err = uffd_wp_range(vma, addr, end - addr, true);
         |                   ^~~~~~~~~~~~~
   fs/proc/task_mmu.c: In function 'pagemap_scan_init_bounce_buffer':
   fs/proc/task_mmu.c:2290:22: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
    2290 |         p->vec_out = (void __user *)p->arg.vec;
         |                      ^
   fs/proc/task_mmu.c: At top level:
   fs/proc/task_mmu.c:1967:13: warning: 'pagemap_scan_backout_range' defined but not used [-Wunused-function]
    1967 | static void pagemap_scan_backout_range(struct pagemap_scan_private *p,
         |             ^~~~~~~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors


vim +/uffd_wp_range +2200 fs/proc/task_mmu.c

  2182	
  2183	static int pagemap_scan_pte_hole(unsigned long addr, unsigned long end,
  2184					 int depth, struct mm_walk *walk)
  2185	{
  2186		struct pagemap_scan_private *p = walk->private;
  2187		struct vm_area_struct *vma = walk->vma;
  2188		int ret;
  2189	
  2190		if (!vma || !pagemap_scan_is_interesting_page(p->cur_vma_category, p))
  2191			return 0;
  2192	
  2193		ret = pagemap_scan_output(p->cur_vma_category, p, addr, &end);
  2194		if (addr == end)
  2195			return ret;
  2196	
  2197		if (~p->arg.flags & PM_SCAN_WP_MATCHING)
  2198			return ret;
  2199	
> 2200		int err = uffd_wp_range(vma, addr, end - addr, true);
  2201		if (err < 0)
  2202			ret = err;
  2203	
  2204		return ret;
  2205	}
  2206	

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