[rppt:execmem/x86-rox/v8 3/6] arch/x86/mm/pat/set_memory.c:1314:17: error: implicit declaration of function 'collapse_page_count'; did you mean 'update_page_count'?

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/rppt/linux.git execmem/x86-rox/v8
head:   6c4eb6e17cdd71fe4df151523bb69db507c52b8c
commit: 84b77b5e5004c02f0f731ca69c66a8d8f4bcbc6c [3/6] x86/mm/pat: Restore large pages after fragmentation
config: x86_64-buildonly-randconfig-004-20241222 (https://download.01.org/0day-ci/archive/20241222/202412222227.GhIMiwUp-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241222/202412222227.GhIMiwUp-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/202412222227.GhIMiwUp-lkp@intel.com/

All errors (new ones prefixed by >>):

   arch/x86/mm/pat/set_memory.c: In function 'collapse_pmd_page':
>> arch/x86/mm/pat/set_memory.c:1314:17: error: implicit declaration of function 'collapse_page_count'; did you mean 'update_page_count'? [-Werror=implicit-function-declaration]
    1314 |                 collapse_page_count(PG_LEVEL_2M);
         |                 ^~~~~~~~~~~~~~~~~~~
         |                 update_page_count
   cc1: some warnings being treated as errors


vim +1314 arch/x86/mm/pat/set_memory.c

  1251	
  1252	static int collapse_pmd_page(pmd_t *pmd, unsigned long addr,
  1253				     struct list_head *pgtables)
  1254	{
  1255		pmd_t _pmd, old_pmd;
  1256		pte_t *pte, first;
  1257		unsigned long pfn;
  1258		pgprot_t pgprot;
  1259		int i = 0;
  1260	
  1261		addr &= PMD_MASK;
  1262		pte = pte_offset_kernel(pmd, addr);
  1263		first = *pte;
  1264		pfn = pte_pfn(first);
  1265	
  1266		/* Make sure alignment is suitable */
  1267		if (PFN_PHYS(pfn) & ~PMD_MASK)
  1268			return 0;
  1269	
  1270		/* The page is 4k intentionally */
  1271		if (pte_flags(first) & _PAGE_KERNEL_4K)
  1272			return 0;
  1273	
  1274		/* Check that the rest of PTEs are compatible with the first one */
  1275		for (i = 1, pte++; i < PTRS_PER_PTE; i++, pte++) {
  1276			pte_t entry = *pte;
  1277	
  1278			if (!pte_present(entry))
  1279				return 0;
  1280			if (pte_flags(entry) != pte_flags(first))
  1281				return 0;
  1282			if (pte_pfn(entry) != pte_pfn(first) + i)
  1283				return 0;
  1284		}
  1285	
  1286		old_pmd = *pmd;
  1287	
  1288		/* Success: set up a large page */
  1289		pgprot = pgprot_4k_2_large(pte_pgprot(first));
  1290		pgprot_val(pgprot) |= _PAGE_PSE;
  1291		_pmd = pfn_pmd(pfn, pgprot);
  1292		set_pmd(pmd, _pmd);
  1293	
  1294		/* Queue the page table to be freed after TLB flush */
  1295		list_add(&page_ptdesc(pmd_page(old_pmd))->pt_list, pgtables);
  1296	
  1297		if (IS_ENABLED(CONFIG_X86_32) && !SHARED_KERNEL_PMD) {
  1298			struct page *page;
  1299	
  1300			/* Update all PGD tables to use the same large page */
  1301			list_for_each_entry(page, &pgd_list, lru) {
  1302				pgd_t *pgd = (pgd_t *)page_address(page) + pgd_index(addr);
  1303				p4d_t *p4d = p4d_offset(pgd, addr);
  1304				pud_t *pud = pud_offset(p4d, addr);
  1305				pmd_t *pmd = pmd_offset(pud, addr);
  1306				/* Something is wrong if entries doesn't match */
  1307				if (WARN_ON(pmd_val(old_pmd) != pmd_val(*pmd)))
  1308					continue;
  1309				set_pmd(pmd, _pmd);
  1310			}
  1311		}
  1312	
  1313		if (pfn_range_is_mapped(pfn, pfn + 1))
> 1314			collapse_page_count(PG_LEVEL_2M);
  1315	
  1316		return 1;
  1317	}
  1318	

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