[linux-next:master 4432/4710] arch/powerpc/mm/init_64.c:201:15: error: no previous prototype for '__vmemmap_populate'

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   d7b3af5a77e8d8da28f435f313e069aea5bcf172
commit: 30c80d3ed8d266bf42116b7f13dbb15b76989232 [4432/4710] powerpc/book3s64/radix: remove mmu_vmemmap_psize
config: powerpc-pasemi_defconfig (https://download.01.org/0day-ci/archive/20230731/202307311138.bn4Pj1Ht-lkp@intel.com/config)
compiler: powerpc64-linux-gcc (GCC) 12.3.0
reproduce: (https://download.01.org/0day-ci/archive/20230731/202307311138.bn4Pj1Ht-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/202307311138.bn4Pj1Ht-lkp@intel.com/

All errors (new ones prefixed by >>):

>> arch/powerpc/mm/init_64.c:201:15: error: no previous prototype for '__vmemmap_populate' [-Werror=missing-prototypes]
     201 | int __meminit __vmemmap_populate(unsigned long start, unsigned long end, int node,
         |               ^~~~~~~~~~~~~~~~~~
   cc1: all warnings being treated as errors


vim +/__vmemmap_populate +201 arch/powerpc/mm/init_64.c

   200	
 > 201	int __meminit __vmemmap_populate(unsigned long start, unsigned long end, int node,
   202					 struct vmem_altmap *altmap)
   203	{
   204		bool altmap_alloc;
   205		unsigned long page_size = 1 << mmu_psize_defs[mmu_vmemmap_psize].shift;
   206	
   207		/* Align to the page size of the linear mapping. */
   208		start = ALIGN_DOWN(start, page_size);
   209	
   210		pr_debug("vmemmap_populate %lx..%lx, node %d\n", start, end, node);
   211	
   212		for (; start < end; start += page_size) {
   213			void *p = NULL;
   214			int rc;
   215	
   216			/*
   217			 * This vmemmap range is backing different subsections. If any
   218			 * of that subsection is marked valid, that means we already
   219			 * have initialized a page table covering this range and hence
   220			 * the vmemmap range is populated.
   221			 */
   222			if (vmemmap_populated(start, page_size))
   223				continue;
   224	
   225			/*
   226			 * Allocate from the altmap first if we have one. This may
   227			 * fail due to alignment issues when using 16MB hugepages, so
   228			 * fall back to system memory if the altmap allocation fail.
   229			 */
   230			if (altmap && !altmap_cross_boundary(altmap, start, page_size)) {
   231				p = vmemmap_alloc_block_buf(page_size, node, altmap);
   232				if (!p)
   233					pr_debug("altmap block allocation failed, falling back to system memory");
   234				else
   235					altmap_alloc = true;
   236			}
   237			if (!p) {
   238				p = vmemmap_alloc_block_buf(page_size, node, NULL);
   239				altmap_alloc = false;
   240			}
   241			if (!p)
   242				return -ENOMEM;
   243	
   244			if (vmemmap_list_populate(__pa(p), start, node)) {
   245				/*
   246				 * If we don't populate vmemap list, we don't have
   247				 * the ability to free the allocated vmemmap
   248				 * pages in section_deactivate. Hence free them
   249				 * here.
   250				 */
   251				int nr_pfns = page_size >> PAGE_SHIFT;
   252				unsigned long page_order = get_order(page_size);
   253	
   254				if (altmap_alloc)
   255					vmem_altmap_free(altmap, nr_pfns);
   256				else
   257					free_pages((unsigned long)p, page_order);
   258				return -ENOMEM;
   259			}
   260	
   261			pr_debug("      * %016lx..%016lx allocated at %p\n",
   262				 start, start + page_size, p);
   263	
   264			rc = vmemmap_create_mapping(start, page_size, __pa(p));
   265			if (rc < 0) {
   266				pr_warn("%s: Unable to create vmemmap mapping: %d\n",
   267					__func__, rc);
   268				return -EFAULT;
   269			}
   270		}
   271	
   272		return 0;
   273	}
   274	

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