[openeuler:openEuler-1.0-LTS 1418/1418] mm/hugetlb.c:1370:6: warning: no previous prototype for function 'free_huge_page_to_dhugetlb_pool'

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

Hi Liu,

FYI, the error/warning still remains.

tree:   https://gitee.com/openeuler/kernel.git openEuler-1.0-LTS
head:   3191c9e4e7c581bfe0a40ee198ffcbd5c3dea53e
commit: 0bc0d0d57edacd59ebe38d05ad9c4b2bc185aa51 [1418/1418] dhugetlb: backport dynamic hugetlb feature
config: x86_64-buildonly-randconfig-003-20250207 (https://download.01.org/0day-ci/archive/20250408/202504081022.SWpK2BGS-lkp@intel.com/config)
compiler: clang version 19.1.3 (https://github.com/llvm/llvm-project ab51eccf88f5321e7c60591c5546b254b6afab99)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250408/202504081022.SWpK2BGS-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/202504081022.SWpK2BGS-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> mm/hugetlb.c:1370:6: warning: no previous prototype for function 'free_huge_page_to_dhugetlb_pool' [-Wmissing-prototypes]
    1370 | void free_huge_page_to_dhugetlb_pool(struct page *page, bool restore_reserve)
         |      ^
   mm/hugetlb.c:1370:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
    1370 | void free_huge_page_to_dhugetlb_pool(struct page *page, bool restore_reserve)
         | ^
         | static 
   In file included from mm/hugetlb.c:14:
   include/linux/mempolicy.h:329:13: warning: unused function '__do_mbind' [-Wunused-function]
     329 | static long __do_mbind(unsigned long start, unsigned long len,
         |             ^~~~~~~~~~
   2 warnings generated.


vim +/free_huge_page_to_dhugetlb_pool +1370 mm/hugetlb.c

  1324	
  1325	#ifdef CONFIG_DYNAMIC_HUGETLB
  1326	static void free_huge_page_to_dhugetlb_pool(struct page *page,
  1327						    bool restore_reserve)
  1328	{
  1329		struct hstate *h = page_hstate(page);
  1330		struct dhugetlb_pool *hpool;
  1331	
  1332		hpool = get_dhugetlb_pool_from_dhugetlb_pagelist(page);
  1333		if (unlikely(!hpool)) {
  1334			pr_err("dhugetlb: free error: get hpool failed\n");
  1335			return;
  1336		}
  1337	
  1338		spin_lock(&hpool->lock);
  1339		ClearPagePool(page);
  1340		set_compound_page_dtor(page, NULL_COMPOUND_DTOR);
  1341		if (!hstate_is_gigantic(h)) {
  1342			list_add(&page->lru, &hpool->dhugetlb_2M_freelists);
  1343			hpool->free_reserved_2M++;
  1344			hpool->used_2M--;
  1345			if (restore_reserve) {
  1346				hpool->mmap_reserved_2M++;
  1347				trace_dhugetlb_acct_memory(hpool,
  1348							   hpool->mmap_reserved_2M,
  1349							   DHUGETLB_RESV_2M);
  1350			}
  1351			trace_dhugetlb_alloc_free(hpool, page, hpool->free_reserved_2M,
  1352						  DHUGETLB_FREE_2M);
  1353		} else {
  1354			list_add(&page->lru, &hpool->dhugetlb_1G_freelists);
  1355			hpool->free_reserved_1G++;
  1356			hpool->used_1G--;
  1357			if (restore_reserve) {
  1358				hpool->mmap_reserved_1G++;
  1359				trace_dhugetlb_acct_memory(hpool,
  1360							   hpool->mmap_reserved_1G,
  1361							   DHUGETLB_RESV_1G);
  1362			}
  1363			trace_dhugetlb_alloc_free(hpool, page, hpool->free_reserved_1G,
  1364						  DHUGETLB_FREE_1G);
  1365		}
  1366		spin_unlock(&hpool->lock);
  1367		dhugetlb_pool_put(hpool);
  1368	}
  1369	#else
> 1370	void free_huge_page_to_dhugetlb_pool(struct page *page, bool restore_reserve)
  1371	{
  1372	}
  1373	#endif
  1374	

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