[akpm-mm:mm-new /391] arch/powerpc/mm/book3s64/radix_pgtable.c:1274:46: error: call to undeclared function 'device_zone'; ISO C99 and later do not support implicit function declarations

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-new
head:   1f78f28a2945f9e856b4ea8428ac41a6788e4b67
commit: 88ef4ca76f70778f2f51c9e749dc9bcc607a2424 [/391] powerpc/mm: switch device DAX to shared tail vmemmap pages
config: powerpc64-randconfig-002-20260911 (https://download.01.org/0day-ci/archive/20260911/202609110857.T3uVHRo8-lkp@intel.com/config)
compiler: clang version 24.0.0git (https://github.com/llvm/llvm-project 96295a1412f9afbee9d4a3c2701e83f5a529a9cc)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260911/202609110857.T3uVHRo8-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/202609110857.T3uVHRo8-lkp@intel.com/

Note: the akpm-mm/mm-new HEAD 1f78f28a2945f9e856b4ea8428ac41a6788e4b67 builds fine.
      It only hurts bisectability.

All errors (new ones prefixed by >>):

>> arch/powerpc/mm/book3s64/radix_pgtable.c:1274:46: error: call to undeclared function 'device_zone'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    1274 |         tail_page = vmemmap_shared_tail_page(order, device_zone(node));
         |                                                     ^
   arch/powerpc/mm/book3s64/radix_pgtable.c:1274:46: note: did you mean 'device_move'?
   include/linux/device.h:1209:5: note: 'device_move' declared here
    1209 | int device_move(struct device *dev, struct device *new_parent,
         |     ^
>> arch/powerpc/mm/book3s64/radix_pgtable.c:1274:46: error: incompatible integer to pointer conversion passing 'int' to parameter of type 'struct zone *' [-Wint-conversion]
    1274 |         tail_page = vmemmap_shared_tail_page(order, device_zone(node));
         |                                                     ^~~~~~~~~~~~~~~~~
   include/linux/vmemmap-optimization.h:89:72: note: passing argument to parameter 'zone' here
      89 | struct page *vmemmap_shared_tail_page(unsigned int order, struct zone *zone);
         |                                                                        ^
   2 errors generated.


vim +/device_zone +1274 arch/powerpc/mm/book3s64/radix_pgtable.c

  1253	
  1254	int __meminit vmemmap_populate_compound_pages(unsigned long start_pfn,
  1255						      unsigned long start,
  1256						      unsigned long end, int node,
  1257						      struct dev_pagemap *pgmap)
  1258	{
  1259		/*
  1260		 * we want to map things as base page size mapping so that
  1261		 * we can save space in vmemmap. We could have huge mapping
  1262		 * covering out both edges.
  1263		 */
  1264		unsigned long addr;
  1265		unsigned long next;
  1266		pgd_t *pgd;
  1267		p4d_t *p4d;
  1268		pud_t *pud;
  1269		pmd_t *pmd;
  1270		pte_t *pte;
  1271		struct page *tail_page;
  1272		unsigned int order = pfn_to_section_order(start_pfn);
  1273	
> 1274		tail_page = vmemmap_shared_tail_page(order, device_zone(node));
  1275		if (!tail_page)
  1276			return -ENOMEM;
  1277	
  1278		for (addr = start; addr < end; addr = next) {
  1279	
  1280			pgd = pgd_offset_k(addr);
  1281			p4d = p4d_offset(pgd, addr);
  1282			pud = vmemmap_pud_alloc(p4d, node, addr);
  1283			if (!pud)
  1284				return -ENOMEM;
  1285			pmd = vmemmap_pmd_alloc(pud, node, addr);
  1286			if (!pmd)
  1287				return -ENOMEM;
  1288	
  1289			if (pmd_leaf(READ_ONCE(*pmd))) {
  1290				/* existing huge mapping. Skip the range */
  1291				next = pmd_addr_end(addr, end);
  1292				continue;
  1293			}
  1294			pte = vmemmap_pte_alloc(pmd, node, addr);
  1295			if (!pte)
  1296				return -ENOMEM;
  1297			if (!pte_none(*pte)) {
  1298				/*
  1299				 * This could be because we already have a compound
  1300				 * page whose VMEMMAP_RESERVE_NR pages were mapped and
  1301				 * this request fall in those pages.
  1302				 */
  1303				next = addr + PAGE_SIZE;
  1304				continue;
  1305			} else {
  1306				unsigned long nr_pages = 1UL << order;
  1307				unsigned long addr_pfn = page_to_pfn((struct page *)addr);
  1308				unsigned long pfn_offset = addr_pfn - ALIGN_DOWN(addr_pfn, nr_pages);
  1309	
  1310				/*
  1311				 * if the address is aligned to huge page size it is the
  1312				 * head mapping.
  1313				 */
  1314				if (pfn_offset == 0) {
  1315					/* Populate the head page vmemmap page */
  1316					pte = radix__vmemmap_pte_populate(pmd, addr, node, NULL, NULL);
  1317					if (!pte)
  1318						return -ENOMEM;
  1319					vmemmap_verify(pte, node, addr, addr + PAGE_SIZE);
  1320	
  1321					/*
  1322					 * Populate the tail pages vmemmap page
  1323					 * It can fall in different pmd, hence
  1324					 * vmemmap_populate_address()
  1325					 */
  1326					pte = radix__vmemmap_populate_address(addr + PAGE_SIZE, node, NULL, NULL);
  1327					if (!pte)
  1328						return -ENOMEM;
  1329	
  1330					next = addr + 2 * PAGE_SIZE;
  1331					continue;
  1332				}
  1333	
  1334				pte = radix__vmemmap_pte_populate(pmd, addr, node, NULL, tail_page);
  1335				if (!pte)
  1336					return -ENOMEM;
  1337				vmemmap_verify(pte, node, addr, addr + PAGE_SIZE);
  1338	
  1339				next = addr + PAGE_SIZE;
  1340				continue;
  1341			}
  1342		}
  1343		return 0;
  1344	}
  1345	

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