Re: [PATCH] mm: Move page_mapping_file to pagemap.h

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

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Hi "Matthew,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on hnaz-linux-mm/master]

url:    https://github.com/0day-ci/linux/commits/Matthew-Wilcox-Oracle/mm-Move-page_mapping_file-to-pagemap-h/20210316-221138
base:   https://github.com/hnaz/linux-mm master
config: mips-randconfig-r032-20210316 (attached as .config)
compiler: mips-linux-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://github.com/0day-ci/linux/commit/5f7b112de945843f38fbf9f602dd547010e8b8d0
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Matthew-Wilcox-Oracle/mm-Move-page_mapping_file-to-pagemap-h/20210316-221138
        git checkout 5f7b112de945843f38fbf9f602dd547010e8b8d0
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=mips 

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

All error/warnings (new ones prefixed by >>):

   arch/mips/mm/cache.c: In function '__flush_dcache_page':
>> arch/mips/mm/cache.c:85:34: error: implicit declaration of function 'page_mapping_file'; did you mean 'page_mapping'? [-Werror=implicit-function-declaration]
      85 |  struct address_space *mapping = page_mapping_file(page);
         |                                  ^~~~~~~~~~~~~~~~~
         |                                  page_mapping
>> arch/mips/mm/cache.c:85:34: warning: initialization of 'struct address_space *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
   arch/mips/mm/cache.c: At top level:
   arch/mips/mm/cache.c:129:6: warning: no previous prototype for '__update_cache' [-Wmissing-prototypes]
     129 | void __update_cache(unsigned long address, pte_t pte)
         |      ^~~~~~~~~~~~~~
   arch/mips/mm/cache.c:236:12: warning: no previous prototype for '__uncached_access' [-Wmissing-prototypes]
     236 | int __weak __uncached_access(struct file *file, unsigned long addr)
         |            ^~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors


vim +85 arch/mips/mm/cache.c

^1da177e4c3f41 Linus Torvalds 2005-04-16   82  
^1da177e4c3f41 Linus Torvalds 2005-04-16   83  void __flush_dcache_page(struct page *page)
^1da177e4c3f41 Linus Torvalds 2005-04-16   84  {
cb9f753a3731f7 Huang Ying     2018-04-05  @85  	struct address_space *mapping = page_mapping_file(page);
^1da177e4c3f41 Linus Torvalds 2005-04-16   86  	unsigned long addr;
^1da177e4c3f41 Linus Torvalds 2005-04-16   87  
^1da177e4c3f41 Linus Torvalds 2005-04-16   88  	if (mapping && !mapping_mapped(mapping)) {
^1da177e4c3f41 Linus Torvalds 2005-04-16   89  		SetPageDcacheDirty(page);
^1da177e4c3f41 Linus Torvalds 2005-04-16   90  		return;
^1da177e4c3f41 Linus Torvalds 2005-04-16   91  	}
^1da177e4c3f41 Linus Torvalds 2005-04-16   92  
^1da177e4c3f41 Linus Torvalds 2005-04-16   93  	/*
^1da177e4c3f41 Linus Torvalds 2005-04-16   94  	 * We could delay the flush for the !page_mapping case too.  But that
^1da177e4c3f41 Linus Torvalds 2005-04-16   95  	 * case is for exec env/arg pages and those are %99 certainly going to
^1da177e4c3f41 Linus Torvalds 2005-04-16   96  	 * get faulted into the tlb (and thus flushed) anyways.
^1da177e4c3f41 Linus Torvalds 2005-04-16   97  	 */
234859e49a1532 Paul Burton    2016-03-01   98  	if (PageHighMem(page))
234859e49a1532 Paul Burton    2016-03-01   99  		addr = (unsigned long)kmap_atomic(page);
234859e49a1532 Paul Burton    2016-03-01  100  	else
^1da177e4c3f41 Linus Torvalds 2005-04-16  101  		addr = (unsigned long)page_address(page);
234859e49a1532 Paul Burton    2016-03-01  102  
^1da177e4c3f41 Linus Torvalds 2005-04-16  103  	flush_data_cache_page(addr);
234859e49a1532 Paul Burton    2016-03-01  104  
234859e49a1532 Paul Burton    2016-03-01  105  	if (PageHighMem(page))
abca2500c0c1b2 Ira Weiny      2020-06-04  106  		kunmap_atomic((void *)addr);
^1da177e4c3f41 Linus Torvalds 2005-04-16  107  }
^1da177e4c3f41 Linus Torvalds 2005-04-16  108  

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

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