Re: [PATCH v2] mm/hugetlb: convert get_hwpoison_huge_page() to folios

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

Hi Sidhartha,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on akpm-mm/mm-everything]

url:    https://github.com/intel-lab-lkp/linux/commits/Sidhartha-Kumar/mm-hugetlb-convert-get_hwpoison_huge_page-to-folios/20230119-014337
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20230118174039.14247-1-sidhartha.kumar%40oracle.com
patch subject: [PATCH v2] mm/hugetlb: convert get_hwpoison_huge_page() to folios
config: arm64-buildonly-randconfig-r006-20230118 (https://download.01.org/0day-ci/archive/20230119/202301190837.bTrbAr7a-lkp@intel.com/config)
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 4196ca3278f78c6e19246e54ab0ecb364e37d66a)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # https://github.com/intel-lab-lkp/linux/commit/6704f4eff6775ce3ccc4156b41b9d1c4d091eb14
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Sidhartha-Kumar/mm-hugetlb-convert-get_hwpoison_huge_page-to-folios/20230119-014337
        git checkout 6704f4eff6775ce3ccc4156b41b9d1c4d091eb14
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash

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

All errors (new ones prefixed by >>):

>> mm/memory-failure.c:1335:8: error: call to undeclared function 'get_hwpoison_hugetlb_folio'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
           ret = get_hwpoison_hugetlb_folio(folio, &hugetlb, false);
                 ^
   mm/memory-failure.c:1335:8: note: did you mean 'get_hwpoison_huge_page'?
   include/linux/hugetlb.h:420:19: note: 'get_hwpoison_huge_page' declared here
   static inline int get_hwpoison_huge_page(struct page *page, bool *hugetlb, bool unpoison)
                     ^
   mm/memory-failure.c:1425:8: error: call to undeclared function 'get_hwpoison_hugetlb_folio'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
           ret = get_hwpoison_hugetlb_folio(folio, &hugetlb, true);
                 ^
   2 errors generated.


vim +/get_hwpoison_hugetlb_folio +1335 mm/memory-failure.c

  1328	
  1329	static int __get_hwpoison_page(struct page *page, unsigned long flags)
  1330	{
  1331		struct folio *folio = page_folio(page);
  1332		int ret = 0;
  1333		bool hugetlb = false;
  1334	
> 1335		ret = get_hwpoison_hugetlb_folio(folio, &hugetlb, false);
  1336		if (hugetlb)
  1337			return ret;
  1338	
  1339		/*
  1340		 * This check prevents from calling folio_try_get() for any
  1341		 * unsupported type of folio in order to reduce the risk of unexpected
  1342		 * races caused by taking a folio refcount.
  1343		 */
  1344		if (!HWPoisonHandlable(&folio->page, flags))
  1345			return -EBUSY;
  1346	
  1347		if (folio_try_get(folio)) {
  1348			if (folio == page_folio(page))
  1349				return 1;
  1350	
  1351			pr_info("%#lx cannot catch tail\n", page_to_pfn(page));
  1352			folio_put(folio);
  1353		}
  1354	
  1355		return 0;
  1356	}
  1357	

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