From: kernel test robot <lkp@intel.com>
To: Gregory Price <gourry@gourry.net>
Cc: llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev
Subject: [gourryinverse:private_compression 48/60] mm/internal.h:1534:7: error: call to undeclared function 'pte_write'; ISO C99 and later do not support implicit function declarations
Date: Sun, 22 Feb 2026 16:52:14 +0800 [thread overview]
Message-ID: <202602221615.CP75D6Df-lkp@intel.com> (raw)
tree: https://github.com/gourryinverse/linux private_compression
head: 9fa5ffee4fd4726e31f05deebb938cccfa0b460f
commit: 48a8ea8dcaa2781e2ab529cf440334d15dca5512 [48/60] mm/mprotect: NP_OPS_PROTECT_WRITE - gate PTE/PMD write-upgrades
config: arm-allnoconfig (https://download.01.org/0day-ci/archive/20260222/202602221615.CP75D6Df-lkp@intel.com/config)
compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project e86750b29fa0ff207cd43213d66dabe565417638)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260222/202602221615.CP75D6Df-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/202602221615.CP75D6Df-lkp@intel.com/
All errors (new ones prefixed by >>):
In file included from mm/filemap.c:54:
>> mm/internal.h:1534:7: error: call to undeclared function 'pte_write'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
1534 | if (pte_write(pte))
| ^
mm/internal.h:1534:7: note: did you mean 'pgd_write'?
include/linux/hugetlb.h:475:19: note: 'pgd_write' declared here
475 | static inline int pgd_write(pgd_t pgd)
| ^
In file included from mm/filemap.c:54:
>> mm/internal.h:1535:12: error: call to undeclared function 'make_writable_device_private_entry'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
1535 | entry = make_writable_device_private_entry(
| ^
>> mm/internal.h:1535:10: error: assigning to 'softleaf_t' (aka 'swp_entry_t') from incompatible type 'int'
1535 | entry = make_writable_device_private_entry(
| ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1536 | page_to_pfn(new));
| ~~~~~~~~~~~~~~~~~
>> mm/internal.h:1538:12: error: call to undeclared function 'make_readable_device_private_entry'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
1538 | entry = make_readable_device_private_entry(
| ^
mm/internal.h:1538:10: error: assigning to 'softleaf_t' (aka 'swp_entry_t') from incompatible type 'int'
1538 | entry = make_readable_device_private_entry(
| ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1539 | page_to_pfn(new));
| ~~~~~~~~~~~~~~~~~
>> mm/internal.h:1540:9: error: call to undeclared function 'softleaf_to_pte'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
1540 | pte = softleaf_to_pte(entry);
| ^
>> mm/internal.h:1543:7: error: call to undeclared function 'pte_swp_uffd_wp'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
1543 | if (pte_swp_uffd_wp(old_pte))
| ^
mm/internal.h:1543:7: note: did you mean 'pte_swp_uffd_wp_any'?
include/linux/userfaultfd_k.h:463:20: note: 'pte_swp_uffd_wp_any' declared here
463 | static inline bool pte_swp_uffd_wp_any(pte_t pte)
| ^
In file included from mm/filemap.c:54:
>> mm/internal.h:1544:10: error: call to undeclared function 'pte_swp_mkuffd_wp'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
1544 | pte = pte_swp_mkuffd_wp(pte);
| ^
>> mm/internal.h:1546:9: error: call to undeclared function 'pte_wrprotect'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
1546 | pte = pte_wrprotect(pte);
| ^
9 errors generated.
--
In file included from mm/oom_kill.c:50:
>> mm/internal.h:1534:7: error: call to undeclared function 'pte_write'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
1534 | if (pte_write(pte))
| ^
>> mm/internal.h:1535:12: error: call to undeclared function 'make_writable_device_private_entry'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
1535 | entry = make_writable_device_private_entry(
| ^
>> mm/internal.h:1535:10: error: assigning to 'softleaf_t' (aka 'swp_entry_t') from incompatible type 'int'
1535 | entry = make_writable_device_private_entry(
| ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1536 | page_to_pfn(new));
| ~~~~~~~~~~~~~~~~~
>> mm/internal.h:1538:12: error: call to undeclared function 'make_readable_device_private_entry'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
1538 | entry = make_readable_device_private_entry(
| ^
mm/internal.h:1538:10: error: assigning to 'softleaf_t' (aka 'swp_entry_t') from incompatible type 'int'
1538 | entry = make_readable_device_private_entry(
| ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1539 | page_to_pfn(new));
| ~~~~~~~~~~~~~~~~~
>> mm/internal.h:1540:9: error: call to undeclared function 'softleaf_to_pte'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
1540 | pte = softleaf_to_pte(entry);
| ^
>> mm/internal.h:1543:7: error: call to undeclared function 'pte_swp_uffd_wp'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
1543 | if (pte_swp_uffd_wp(old_pte))
| ^
mm/internal.h:1543:7: note: did you mean 'pte_swp_uffd_wp_any'?
include/linux/userfaultfd_k.h:463:20: note: 'pte_swp_uffd_wp_any' declared here
463 | static inline bool pte_swp_uffd_wp_any(pte_t pte)
| ^
In file included from mm/oom_kill.c:50:
>> mm/internal.h:1544:10: error: call to undeclared function 'pte_swp_mkuffd_wp'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
1544 | pte = pte_swp_mkuffd_wp(pte);
| ^
>> mm/internal.h:1546:9: error: call to undeclared function 'pte_wrprotect'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
1546 | pte = pte_wrprotect(pte);
| ^
9 errors generated.
vim +/pte_write +1534 mm/internal.h
1509
1510 /**
1511 * folio_managed_fixup_migration_pte - Fixup PTE after migration for
1512 * managed memory pages.
1513 * @new: the destination page
1514 * @pte: the PTE being installed (normal PTE built by caller)
1515 * @old_pte: the original PTE (before migration, for swap entry flags)
1516 * @vma: the VMA
1517 *
1518 * For MEMORY_DEVICE_PRIVATE pages: replaces the PTE with a device-private
1519 * swap entry, preserving soft_dirty and uffd_wp from old_pte.
1520 *
1521 * For N_MEMORY_PRIVATE pages with NP_OPS_PROTECT_WRITE: strips the write
1522 * bit so the next write triggers the fault handler for promotion.
1523 *
1524 * For normal pages: returns pte unmodified.
1525 */
1526 static inline pte_t folio_managed_fixup_migration_pte(struct page *new,
1527 pte_t pte,
1528 pte_t old_pte,
1529 struct vm_area_struct *vma)
1530 {
1531 if (unlikely(is_device_private_page(new))) {
1532 softleaf_t entry;
1533
> 1534 if (pte_write(pte))
> 1535 entry = make_writable_device_private_entry(
1536 page_to_pfn(new));
1537 else
> 1538 entry = make_readable_device_private_entry(
1539 page_to_pfn(new));
> 1540 pte = softleaf_to_pte(entry);
1541 if (pte_swp_soft_dirty(old_pte))
1542 pte = pte_swp_mksoft_dirty(pte);
> 1543 if (pte_swp_uffd_wp(old_pte))
> 1544 pte = pte_swp_mkuffd_wp(pte);
1545 } else if (folio_managed_wrprotect(page_folio(new))) {
> 1546 pte = pte_wrprotect(pte);
1547 }
1548 return pte;
1549 }
1550
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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