[linux-next:master 2778/3213] arch/x86/mm/init_64.c:1583:6: error: implicit declaration of function 'vmemmap_use_new_sub_pmd'

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

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   b01d57bfdc41c8f635b08b8a5af8a31217d46936
commit: 3c583493688a0a1276f6a8c0bbc5ece84e77f086 [2778/3213] x86/vmemmap: handle unpopulated sub-pmd ranges
config: x86_64-randconfig-s022-20210309 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.3-262-g5e674421-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=3c583493688a0a1276f6a8c0bbc5ece84e77f086
        git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
        git fetch --no-tags linux-next master
        git checkout 3c583493688a0a1276f6a8c0bbc5ece84e77f086
        # save the attached .config to linux build tree
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   arch/x86/mm/init_64.c: In function 'vmemmap_populate_hugepages':
>> arch/x86/mm/init_64.c:1583:6: error: implicit declaration of function 'vmemmap_use_new_sub_pmd' [-Werror=implicit-function-declaration]
    1583 |      vmemmap_use_new_sub_pmd(addr, next);
         |      ^~~~~~~~~~~~~~~~~~~~~~~
>> arch/x86/mm/init_64.c:1589:4: error: implicit declaration of function 'vmemmap_use_sub_pmd' [-Werror=implicit-function-declaration]
    1589 |    vmemmap_use_sub_pmd(addr, next);
         |    ^~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors


vim +/vmemmap_use_new_sub_pmd +1583 arch/x86/mm/init_64.c

  1530	
  1531	static int __meminit vmemmap_populate_hugepages(unsigned long start,
  1532			unsigned long end, int node, struct vmem_altmap *altmap)
  1533	{
  1534		unsigned long addr;
  1535		unsigned long next;
  1536		pgd_t *pgd;
  1537		p4d_t *p4d;
  1538		pud_t *pud;
  1539		pmd_t *pmd;
  1540	
  1541		for (addr = start; addr < end; addr = next) {
  1542			next = pmd_addr_end(addr, end);
  1543	
  1544			pgd = vmemmap_pgd_populate(addr, node);
  1545			if (!pgd)
  1546				return -ENOMEM;
  1547	
  1548			p4d = vmemmap_p4d_populate(pgd, addr, node);
  1549			if (!p4d)
  1550				return -ENOMEM;
  1551	
  1552			pud = vmemmap_pud_populate(p4d, addr, node);
  1553			if (!pud)
  1554				return -ENOMEM;
  1555	
  1556			pmd = pmd_offset(pud, addr);
  1557			if (pmd_none(*pmd)) {
  1558				void *p;
  1559	
  1560				p = vmemmap_alloc_block_buf(PMD_SIZE, node, altmap);
  1561				if (p) {
  1562					pte_t entry;
  1563	
  1564					entry = pfn_pte(__pa(p) >> PAGE_SHIFT,
  1565							PAGE_KERNEL_LARGE);
  1566					set_pmd(pmd, __pmd(pte_val(entry)));
  1567	
  1568					/* check to see if we have contiguous blocks */
  1569					if (p_end != p || node_start != node) {
  1570						if (p_start)
  1571							pr_debug(" [%lx-%lx] PMD -> [%p-%p] on node %d\n",
  1572							       addr_start, addr_end-1, p_start, p_end-1, node_start);
  1573						addr_start = addr;
  1574						node_start = node;
  1575						p_start = p;
  1576					}
  1577	
  1578					addr_end = addr + PMD_SIZE;
  1579					p_end = p + PMD_SIZE;
  1580	
  1581					if (!IS_ALIGNED(addr, PMD_SIZE) ||
  1582					    !IS_ALIGNED(next, PMD_SIZE))
> 1583						vmemmap_use_new_sub_pmd(addr, next);
  1584					continue;
  1585				} else if (altmap)
  1586					return -ENOMEM; /* no fallback */
  1587			} else if (pmd_large(*pmd)) {
  1588				vmemmap_verify((pte_t *)pmd, node, addr, next);
> 1589				vmemmap_use_sub_pmd(addr, next);
  1590				continue;
  1591			}
  1592			if (vmemmap_populate_basepages(addr, next, node, NULL))
  1593				return -ENOMEM;
  1594		}
  1595		return 0;
  1596	}
  1597	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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