linux-kernel - Re: [PATCH next 1/2] mm/huge_memory: Implementation of THP COW for executable file mmap

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Message-ID: <202512161240.Ej5BIvIk-lkp@intel.com>
Date: Tue, 16 Dec 2025 13:03:26 +0800
From: kernel test robot <lkp@...el.com>
To: Zhang Qilong <zhangqilong3@...wei.com>, akpm@...ux-foundation.org,
	david@...nel.org, lorenzo.stoakes@...cle.com, corbet@....net
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev, ziy@...dia.com,
	baolin.wang@...ux.alibaba.com, Liam.Howlett@...cle.com,
	npache@...hat.com, ryan.roberts@....com, dev.jain@....com,
	baohua@...nel.org, lance.yang@...ux.dev, vbabka@...e.cz,
	rppt@...nel.org, surenb@...gle.com, mhocko@...e.com,
	wangkefeng.wang@...wei.com, sunnanyong@...wei.com,
	linux-mm@...ck.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Zhang Qilong <zhangqilong3@...wei.com>
Subject: Re: [PATCH next 1/2] mm/huge_memory: Implementation of THP COW for
 executable file mmap

Hi Zhang,

kernel test robot noticed the following build errors:

[auto build test ERROR on next-20251215]

url:    https://github.com/intel-lab-lkp/linux/commits/Zhang-Qilong/mm-huge_memory-Implementation-of-THP-COW-for-executable-file-mmap/20251215-204035
base:   next-20251215
patch link:    https://lore.kernel.org/r/20251215123407.380813-2-zhangqilong3%40huawei.com
patch subject: [PATCH next 1/2] mm/huge_memory: Implementation of THP COW for executable file mmap
config: x86_64-allnoconfig (https://download.01.org/0day-ci/archive/20251216/202512161240.Ej5BIvIk-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/20251216/202512161240.Ej5BIvIk-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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202512161240.Ej5BIvIk-lkp@intel.com/

All errors (new ones prefixed by >>):

>> mm/memory.c:6134:7: error: call to undeclared function 'vma_is_special_huge'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    6134 |                 if (vma_is_special_huge(vma) || vma_is_shmem(vma))
         |                     ^
   1 error generated.


vim +/vma_is_special_huge +6134 mm/memory.c

  6104	
  6105	/* `inline' is required to avoid gcc 4.1.2 build error */
  6106	static inline vm_fault_t wp_huge_pmd(struct vm_fault *vmf)
  6107	{
  6108		struct vm_area_struct *vma = vmf->vma;
  6109		const bool unshare = vmf->flags & FAULT_FLAG_UNSHARE;
  6110		vm_fault_t ret;
  6111	
  6112		if (vma_is_anonymous(vma)) {
  6113			if (likely(!unshare) &&
  6114			    userfaultfd_huge_pmd_wp(vma, vmf->orig_pmd)) {
  6115				if (userfaultfd_wp_async(vmf->vma))
  6116					goto split;
  6117				return handle_userfault(vmf, VM_UFFD_WP);
  6118			}
  6119			return do_huge_pmd_wp_page(vmf);
  6120		}
  6121	
  6122		if (vma->vm_flags & (VM_SHARED | VM_MAYSHARE)) {
  6123			if (vma->vm_ops->huge_fault) {
  6124				ret = vma->vm_ops->huge_fault(vmf, PMD_ORDER);
  6125				if (!(ret & VM_FAULT_FALLBACK))
  6126					return ret;
  6127			}
  6128		}
  6129	
  6130	
  6131		if (is_exec_mapping(vma->vm_flags) &&
  6132		    is_cow_mapping(vma->vm_flags)) {
  6133			/* Skip special and shmem */
> 6134			if (vma_is_special_huge(vma) || vma_is_shmem(vma))
  6135				goto split;
  6136	
  6137			ret = do_huge_pmd_exec_cow(vmf);
  6138			if (!(ret & VM_FAULT_FALLBACK))
  6139				return ret;
  6140		}
  6141	
  6142	split:
  6143		/* COW or write-notify handled on pte level: split pmd. */
  6144		__split_huge_pmd(vma, vmf->pmd, vmf->address, false);
  6145	
  6146		return VM_FAULT_FALLBACK;
  6147	}
  6148	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki