Re: [RFC PATCH 2/7] mm: memory: add ptep_clear_flush_range function

[kernel test robot <lkp@intel.com>]

Hi Vernon,

[This is a private test report for your RFC patch.]
kernel test robot noticed the following build errors:

[auto build test ERROR on akpm-mm/mm-everything]
[also build test ERROR on linus/master v6.17-rc1 next-20250814]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Vernon-Yang/mm-memory-replace-single-operation-with-multi-operation-in-wp/20250814-195529
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20250814113813.4533-3-vernon2gm%40gmail.com
patch subject: [RFC PATCH 2/7] mm: memory: add ptep_clear_flush_range function
config: arm-randconfig-002-20250815 (https://download.01.org/0day-ci/archive/20250815/202508151338.3rHqeTte-lkp@intel.com/config)
compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250815/202508151338.3rHqeTte-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/202508151338.3rHqeTte-lkp@intel.com/

All errors (new ones prefixed by >>):

>> mm/pgtable-generic.c:120:3: error: call to undeclared function 'flush_tlb_mm_range'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     120 |                 flush_tlb_mm_range(vma->vm_mm, address, address + nr * PAGE_SIZE,
         |                 ^
   1 error generated.


vim +/flush_tlb_mm_range +120 mm/pgtable-generic.c

   104	
   105	void ptep_clear_flush_range(struct vm_area_struct *vma, unsigned long address,
   106				    pte_t *ptep, unsigned int nr)
   107	{
   108		struct mm_struct *mm = (vma)->vm_mm;
   109		bool accessible = false;
   110		pte_t pte;
   111		int i;
   112	
   113		for (i = 0; i < nr; i++) {
   114			pte = ptep_get_and_clear(mm, address + i * PAGE_SIZE, ptep + i);
   115			if (!accessible && pte_accessible(mm, pte))
   116				accessible = true;
   117		}
   118	
   119		if (accessible) {
 > 120			flush_tlb_mm_range(vma->vm_mm, address, address + nr * PAGE_SIZE,
   121					   PAGE_SHIFT, false);
   122		}
   123	}
   124	#endif
   125	

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