[aa:master 15/20] mm/util.c:738:13: error: implicit declaration of function 'page_mapcount_seq_begin'; did you mean

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

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/andrea/aa.git master
head:   34dd03a2fe9af1f1a9dbd7ec65eb1f247bdfe0db
commit: 4e14c9de85753f6debbd4e6559a3036d99696326 [15/20] mm: thp: make the THP mapcount atomic against __split_huge_pmd_locked()
config: arc-randconfig-r011-20210115 (attached as .config)
compiler: arc-elf-gcc (GCC) 9.3.0
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
        # https://git.kernel.org/pub/scm/linux/kernel/git/andrea/aa.git/commit/?id=4e14c9de85753f6debbd4e6559a3036d99696326
        git remote add aa https://git.kernel.org/pub/scm/linux/kernel/git/andrea/aa.git
        git fetch --no-tags aa master
        git checkout 4e14c9de85753f6debbd4e6559a3036d99696326
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arc 

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 >>):

   mm/util.c: In function 'page_mapping':
   mm/util.c:700:15: warning: variable 'entry' set but not used [-Wunused-but-set-variable]
     700 |   swp_entry_t entry;
         |               ^~~~~
   mm/util.c: In function '__page_mapcount':
>> mm/util.c:738:13: error: implicit declaration of function 'page_mapcount_seq_begin'; did you mean 'page_mapcount_reset'? [-Werror=implicit-function-declaration]
     738 |  seqcount = page_mapcount_seq_begin(page);
         |             ^~~~~~~~~~~~~~~~~~~~~~~
         |             page_mapcount_reset
>> mm/util.c:745:6: error: implicit declaration of function 'page_mapcount_seq_retry'; did you mean 'page_mapcount_reset'? [-Werror=implicit-function-declaration]
     745 |  if (page_mapcount_seq_retry(page, seqcount))
         |      ^~~~~~~~~~~~~~~~~~~~~~~
         |      page_mapcount_reset
   cc1: some warnings being treated as errors


vim +738 mm/util.c

   723	
   724	/* Slow path of page_mapcount() for compound pages */
   725	int __page_mapcount(struct page *page)
   726	{
   727		unsigned long seqcount;
   728		int ret;
   729	
   730		/*
   731		 * For file THP page->_mapcount contains total number of mapping
   732		 * of the page: no need to look into compound_mapcount.
   733		 */
   734		if (!PageAnon(page) && !PageHuge(page))
   735			return atomic_read(&page->_mapcount) + 1;
   736		page = compound_head(page);
   737	again:
 > 738		seqcount = page_mapcount_seq_begin(page);
   739	
   740		ret = atomic_read(&page->_mapcount) + 1;
   741		ret += atomic_read(compound_mapcount_ptr(page)) + 1;
   742		if (PageDoubleMap(page))
   743			ret--;
   744	
 > 745		if (page_mapcount_seq_retry(page, seqcount))
   746			goto again;
   747		return ret;
   748	}
   749	EXPORT_SYMBOL_GPL(__page_mapcount);
   750	

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

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