Hi Yafang, kernel test robot noticed the following build errors: [auto build test ERROR on akpm-mm/mm-everything] url: https://github.com/intel-lab-lkp/linux/commits/Yafang-Shao/mm-thp-remove-disabled-task-from-khugepaged_mm_slot/20250910-144850 base: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything patch link: https://lore.kernel.org/r/20250910024447.64788-2-laoar.shao%40gmail.com patch subject: [PATCH v7 mm-new 01/10] mm: thp: remove disabled task from khugepaged_mm_slot config: x86_64-allnoconfig (https://download.01.org/0day-ci/archive/20250911/202509110109.PSgSHb31-lkp@xxxxxxxxx/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/20250911/202509110109.PSgSHb31-lkp@xxxxxxxxx/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@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202509110109.PSgSHb31-lkp@xxxxxxxxx/ All errors (new ones prefixed by >>): >> kernel/sys.c:2500:6: error: call to undeclared function 'hugepage_pmd_enabled'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration] 2500 | hugepage_pmd_enabled()) | ^ >> kernel/sys.c:2501:3: error: call to undeclared function '__khugepaged_enter'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration] 2501 | __khugepaged_enter(mm); | ^ 2 errors generated. vim +/hugepage_pmd_enabled +2500 kernel/sys.c 2471 2472 static int prctl_set_thp_disable(bool thp_disable, unsigned long flags, 2473 unsigned long arg4, unsigned long arg5) 2474 { 2475 struct mm_struct *mm = current->mm; 2476 2477 if (arg4 || arg5) 2478 return -EINVAL; 2479 2480 /* Flags are only allowed when disabling. */ 2481 if ((!thp_disable && flags) || (flags & ~PR_THP_DISABLE_EXCEPT_ADVISED)) 2482 return -EINVAL; 2483 if (mmap_write_lock_killable(current->mm)) 2484 return -EINTR; 2485 if (thp_disable) { 2486 if (flags & PR_THP_DISABLE_EXCEPT_ADVISED) { 2487 mm_flags_clear(MMF_DISABLE_THP_COMPLETELY, mm); 2488 mm_flags_set(MMF_DISABLE_THP_EXCEPT_ADVISED, mm); 2489 } else { 2490 mm_flags_set(MMF_DISABLE_THP_COMPLETELY, mm); 2491 mm_flags_clear(MMF_DISABLE_THP_EXCEPT_ADVISED, mm); 2492 } 2493 } else { 2494 mm_flags_clear(MMF_DISABLE_THP_COMPLETELY, mm); 2495 mm_flags_clear(MMF_DISABLE_THP_EXCEPT_ADVISED, mm); 2496 } 2497 2498 if (!mm_flags_test(MMF_DISABLE_THP_COMPLETELY, mm) && 2499 !mm_flags_test(MMF_VM_HUGEPAGE, mm) && > 2500 hugepage_pmd_enabled()) > 2501 __khugepaged_enter(mm); 2502 mmap_write_unlock(current->mm); 2503 return 0; 2504 } 2505 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
