* [akpm-mm:mm-unstable 25/274] mm/hugetlb.c:7281:3: error: call to undeclared function '__huge_pmd_unshare'; ISO C99 and later do not support implicit function declarations
@ 2026-05-14 8:37 kernel test robot
2026-05-14 9:34 ` Lorenzo Stoakes
0 siblings, 1 reply; 2+ messages in thread
From: kernel test robot @ 2026-05-14 8:37 UTC (permalink / raw)
To: Lorenzo Stoakes
Cc: llvm, oe-kbuild-all, David Hildenbrand, Andrew Morton,
Linux Memory Management List, mm-commits
tree: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-unstable
head: 444fc9435e57157fcf30fc99aee44997f3458641
commit: 2bb8fe16f7bf4487248c9ff847fcf189c45b9508 [25/274] mm/hugetlb: avoid false positive lockdep assertion
config: powerpc64-randconfig-001-20260514 (https://download.01.org/0day-ci/archive/20260514/202605141638.b5ZBd6IF-lkp@intel.com/config)
compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project 5bac06718f502014fade905512f1d26d578a18f3)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260514/202605141638.b5ZBd6IF-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/202605141638.b5ZBd6IF-lkp@intel.com/
All errors (new ones prefixed by >>):
>> mm/hugetlb.c:7281:3: error: call to undeclared function '__huge_pmd_unshare'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
7281 | __huge_pmd_unshare(&tlb, vma, address, ptep, take_locks);
| ^
mm/hugetlb.c:7281:3: note: did you mean 'huge_pmd_unshare'?
mm/hugetlb.c:6973:5: note: 'huge_pmd_unshare' declared here
6973 | int huge_pmd_unshare(struct mmu_gather *tlb, struct vm_area_struct *vma,
| ^
1 error generated.
vim +/__huge_pmd_unshare +7281 mm/hugetlb.c
7233
7234 /*
7235 * If @take_locks is false, the caller must ensure that no concurrent page table
7236 * access can happen (except for gup_fast() and hardware page walks).
7237 * If @take_locks is true, we take the hugetlb VMA lock (to lock out things like
7238 * concurrent page fault handling) and the file rmap lock.
7239 */
7240 static void hugetlb_unshare_pmds(struct vm_area_struct *vma,
7241 unsigned long start,
7242 unsigned long end,
7243 bool take_locks)
7244 {
7245 struct hstate *h = hstate_vma(vma);
7246 unsigned long sz = huge_page_size(h);
7247 struct mm_struct *mm = vma->vm_mm;
7248 struct mmu_notifier_range range;
7249 struct mmu_gather tlb;
7250 unsigned long address;
7251 spinlock_t *ptl;
7252 pte_t *ptep;
7253
7254 if (!(vma->vm_flags & VM_MAYSHARE))
7255 return;
7256
7257 if (start >= end)
7258 return;
7259
7260 flush_cache_range(vma, start, end);
7261 tlb_gather_mmu_vma(&tlb, vma);
7262
7263 /*
7264 * No need to call adjust_range_if_pmd_sharing_possible(), because
7265 * we have already done the PUD_SIZE alignment.
7266 */
7267 mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, mm,
7268 start, end);
7269 mmu_notifier_invalidate_range_start(&range);
7270 if (take_locks) {
7271 hugetlb_vma_lock_write(vma);
7272 i_mmap_lock_write(vma->vm_file->f_mapping);
7273 } else {
7274 i_mmap_assert_write_locked(vma->vm_file->f_mapping);
7275 }
7276 for (address = start; address < end; address += PUD_SIZE) {
7277 ptep = hugetlb_walk(vma, address, sz);
7278 if (!ptep)
7279 continue;
7280 ptl = huge_pte_lock(h, mm, ptep);
> 7281 __huge_pmd_unshare(&tlb, vma, address, ptep, take_locks);
7282 spin_unlock(ptl);
7283 }
7284 huge_pmd_unshare_flush(&tlb, vma);
7285 if (take_locks) {
7286 i_mmap_unlock_write(vma->vm_file->f_mapping);
7287 hugetlb_vma_unlock_write(vma);
7288 }
7289 /*
7290 * No need to call mmu_notifier_arch_invalidate_secondary_tlbs(), see
7291 * Documentation/mm/mmu_notifier.rst.
7292 */
7293 mmu_notifier_invalidate_range_end(&range);
7294 tlb_finish_mmu(&tlb);
7295 }
7296
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
^ permalink raw reply [flat|nested] 2+ messages in thread* Re: [akpm-mm:mm-unstable 25/274] mm/hugetlb.c:7281:3: error: call to undeclared function '__huge_pmd_unshare'; ISO C99 and later do not support implicit function declarations
2026-05-14 8:37 [akpm-mm:mm-unstable 25/274] mm/hugetlb.c:7281:3: error: call to undeclared function '__huge_pmd_unshare'; ISO C99 and later do not support implicit function declarations kernel test robot
@ 2026-05-14 9:34 ` Lorenzo Stoakes
0 siblings, 0 replies; 2+ messages in thread
From: Lorenzo Stoakes @ 2026-05-14 9:34 UTC (permalink / raw)
To: kernel test robot
Cc: llvm, oe-kbuild-all, David Hildenbrand, Andrew Morton,
Linux Memory Management List, mm-commits
On Thu, May 14, 2026 at 04:37:45PM +0800, kernel test robot wrote:
> tree: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-unstable
> head: 444fc9435e57157fcf30fc99aee44997f3458641
> commit: 2bb8fe16f7bf4487248c9ff847fcf189c45b9508 [25/274] mm/hugetlb: avoid false positive lockdep assertion
> config: powerpc64-randconfig-001-20260514 (https://download.01.org/0day-ci/archive/20260514/202605141638.b5ZBd6IF-lkp@intel.com/config)
> compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project 5bac06718f502014fade905512f1d26d578a18f3)
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260514/202605141638.b5ZBd6IF-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/202605141638.b5ZBd6IF-lkp@intel.com/
>
> All errors (new ones prefixed by >>):
>
> >> mm/hugetlb.c:7281:3: error: call to undeclared function '__huge_pmd_unshare'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
> 7281 | __huge_pmd_unshare(&tlb, vma, address, ptep, take_locks);
> | ^
> mm/hugetlb.c:7281:3: note: did you mean 'huge_pmd_unshare'?
> mm/hugetlb.c:6973:5: note: 'huge_pmd_unshare' declared here
> 6973 | int huge_pmd_unshare(struct mmu_gather *tlb, struct vm_area_struct *vma,
> | ^
> 1 error generated.
Yup, I missed the !CONFIG_HUGETLB_PMD_PAGE_TABLE_SHARING case, sending a fix.
Cheers, Lorenzo
>
>
> vim +/__huge_pmd_unshare +7281 mm/hugetlb.c
>
> 7233
> 7234 /*
> 7235 * If @take_locks is false, the caller must ensure that no concurrent page table
> 7236 * access can happen (except for gup_fast() and hardware page walks).
> 7237 * If @take_locks is true, we take the hugetlb VMA lock (to lock out things like
> 7238 * concurrent page fault handling) and the file rmap lock.
> 7239 */
> 7240 static void hugetlb_unshare_pmds(struct vm_area_struct *vma,
> 7241 unsigned long start,
> 7242 unsigned long end,
> 7243 bool take_locks)
> 7244 {
> 7245 struct hstate *h = hstate_vma(vma);
> 7246 unsigned long sz = huge_page_size(h);
> 7247 struct mm_struct *mm = vma->vm_mm;
> 7248 struct mmu_notifier_range range;
> 7249 struct mmu_gather tlb;
> 7250 unsigned long address;
> 7251 spinlock_t *ptl;
> 7252 pte_t *ptep;
> 7253
> 7254 if (!(vma->vm_flags & VM_MAYSHARE))
> 7255 return;
> 7256
> 7257 if (start >= end)
> 7258 return;
> 7259
> 7260 flush_cache_range(vma, start, end);
> 7261 tlb_gather_mmu_vma(&tlb, vma);
> 7262
> 7263 /*
> 7264 * No need to call adjust_range_if_pmd_sharing_possible(), because
> 7265 * we have already done the PUD_SIZE alignment.
> 7266 */
> 7267 mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, mm,
> 7268 start, end);
> 7269 mmu_notifier_invalidate_range_start(&range);
> 7270 if (take_locks) {
> 7271 hugetlb_vma_lock_write(vma);
> 7272 i_mmap_lock_write(vma->vm_file->f_mapping);
> 7273 } else {
> 7274 i_mmap_assert_write_locked(vma->vm_file->f_mapping);
> 7275 }
> 7276 for (address = start; address < end; address += PUD_SIZE) {
> 7277 ptep = hugetlb_walk(vma, address, sz);
> 7278 if (!ptep)
> 7279 continue;
> 7280 ptl = huge_pte_lock(h, mm, ptep);
> > 7281 __huge_pmd_unshare(&tlb, vma, address, ptep, take_locks);
> 7282 spin_unlock(ptl);
> 7283 }
> 7284 huge_pmd_unshare_flush(&tlb, vma);
> 7285 if (take_locks) {
> 7286 i_mmap_unlock_write(vma->vm_file->f_mapping);
> 7287 hugetlb_vma_unlock_write(vma);
> 7288 }
> 7289 /*
> 7290 * No need to call mmu_notifier_arch_invalidate_secondary_tlbs(), see
> 7291 * Documentation/mm/mmu_notifier.rst.
> 7292 */
> 7293 mmu_notifier_invalidate_range_end(&range);
> 7294 tlb_finish_mmu(&tlb);
> 7295 }
> 7296
>
> --
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests/wiki
^ permalink raw reply [flat|nested] 2+ messages in thread
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2026-05-14 8:37 [akpm-mm:mm-unstable 25/274] mm/hugetlb.c:7281:3: error: call to undeclared function '__huge_pmd_unshare'; ISO C99 and later do not support implicit function declarations kernel test robot
2026-05-14 9:34 ` Lorenzo Stoakes
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