fs/proc/task_mmu.c:2517:5: error: call to undeclared function 'make_uffd_wp_pud'; ISO C99 and later do not support implicit function declarations

fs/proc/task_mmu.c:2517:5: error: call to undeclared function 'make_uffd_wp_pud'; ISO C99 and later do not support implicit function declarations

[kernel test robot]

tree:   https://github.com/intel-lab-lkp/linux/commits/Oscar-Salvador/mm-Add-softleaf_from_pud/20260416-123625
head:   258d05b2de477745977b64b126df65257709931d
commit: 258d05b2de477745977b64b126df65257709931d mm: Make /proc/pid/pagemap use the new generic pagewalk API
date:   16 hours ago
config: x86_64-kexec (https://download.01.org/0day-ci/archive/20260416/202604162242.51z63ao3-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260416/202604162242.51z63ao3-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/202604162242.51z63ao3-lkp@intel.com/

All errors (new ones prefixed by >>):

>> fs/proc/task_mmu.c:2517:5: error: call to undeclared function 'make_uffd_wp_pud'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    2517 |                                 make_uffd_wp_pud(ptw.vma, curr_addr, ptw.pudp);
         |                                 ^
   fs/proc/task_mmu.c:2517:5: note: did you mean 'make_uffd_wp_pmd'?
   fs/proc/task_mmu.c:2054:13: note: 'make_uffd_wp_pmd' declared here
    2054 | static void make_uffd_wp_pmd(struct vm_area_struct *vma,
         |             ^
   1 error generated.


vim +/make_uffd_wp_pud +2517 fs/proc/task_mmu.c

  2467	
  2468	static int pagemap_scan_walk(struct vm_area_struct *vma, struct pagemap_scan_private *p,
  2469				      unsigned long addr)
  2470	{
  2471		int ret = 0;
  2472		struct pt_range_walk ptw = {
  2473			.mm = vma->vm_mm
  2474		};
  2475		enum pt_range_walk_type type;
  2476		pt_type_flags_t flags = PT_TYPE_ALL;
  2477	
  2478	keep_walking:
  2479		type = pt_range_walk_start(&ptw, vma, addr, vma->vm_end, flags);
  2480		while (type != PTW_DONE) {
  2481			unsigned long categories = p->cur_vma_category |
  2482						   pagemap_set_category(p, &ptw, type);
  2483			unsigned long curr_addr = ptw.curr_addr;
  2484	
  2485			if (pagemap_scan_is_interesting_page(categories, p)) {
  2486				unsigned long end;
  2487	
  2488				end = ptw.next_addr;
  2489	
  2490				if (~p->arg.flags & PM_SCAN_WP_MATCHING)
  2491					goto keep_walking;
  2492				if (~categories & PAGE_IS_WRITTEN)
  2493					goto keep_walking;
  2494	
  2495				ret = pagemap_scan_output(categories, p, curr_addr, &end);
  2496				if (curr_addr == end)
  2497					goto out;
  2498	
  2499				if (end != curr_addr + HPAGE_SIZE) {
  2500					if (is_vm_hugetlb_page(ptw.vma)) {
  2501						/* Partial HugeTLB page WP isn't possible. */
  2502						pagemap_scan_backout_range(p, curr_addr, end);
  2503						p->arg.walk_end = curr_addr;
  2504						ret = 0;
  2505						goto keep_walking;
  2506					}
  2507					if (ptw.level == PTW_PMD_LEVEL) {
  2508						pt_range_walk_done(&ptw);
  2509						split_huge_pmd(ptw.vma, ptw.pmdp, curr_addr);
  2510						pagemap_scan_backout_range(p, curr_addr, end);
  2511						/* Relaunch now that we split the pmd */
  2512						goto keep_walking;
  2513					}
  2514				}
  2515	
  2516				if (ptw.level == PTW_PUD_LEVEL)
> 2517					make_uffd_wp_pud(ptw.vma, curr_addr, ptw.pudp);
  2518				if (ptw.level == PTW_PMD_LEVEL)
  2519					make_uffd_wp_pmd(ptw.vma, curr_addr, ptw.pmdp);
  2520				if (ptw.level == PTW_PTE_LEVEL)
  2521					make_uffd_wp_pte(ptw.vma, curr_addr, ptw.ptep, ptw.pte);
  2522			}
  2523			type = pt_range_walk_next(&ptw, vma, vma->vm_start, vma->vm_end, flags);
  2524		}
  2525	out:
  2526		pt_range_walk_done(&ptw);
  2527		return ret;
  2528	}
  2529	

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