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: nios2-defconfig (attached as .config)
compiler: nios2-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=nios2 

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/nios2/mm/cacheflush.c:160:6: warning: no previous prototype for '__flush_dcache_page' [-Wmissing-prototypes]
     160 | void __flush_dcache_page(struct address_space *mapping, struct page *page)
         |      ^~~~~~~~~~~~~~~~~~~
   arch/nios2/mm/cacheflush.c: In function 'flush_dcache_page':
>> arch/nios2/mm/cacheflush.c:183:12: error: implicit declaration of function 'page_mapping_file'; did you mean 'page_mapping'? [-Werror=implicit-function-declaration]
     183 |  mapping = page_mapping_file(page);
         |            ^~~~~~~~~~~~~~~~~
         |            page_mapping
>> arch/nios2/mm/cacheflush.c:183:10: warning: assignment to 'struct address_space *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
     183 |  mapping = page_mapping_file(page);
         |          ^
   arch/nios2/mm/cacheflush.c: In function 'update_mmu_cache':
   arch/nios2/mm/cacheflush.c:221:10: warning: assignment to 'struct address_space *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
     221 |  mapping = page_mapping_file(page);
         |          ^
   cc1: some warnings being treated as errors


vim +183 arch/nios2/mm/cacheflush.c

93c91cb228e76b Ley Foon Tan 2014-11-06  159  
1a70db49a73535 Ley Foon Tan 2015-04-24 @160  void __flush_dcache_page(struct address_space *mapping, struct page *page)
1a70db49a73535 Ley Foon Tan 2015-04-24  161  {
1a70db49a73535 Ley Foon Tan 2015-04-24  162  	/*
1a70db49a73535 Ley Foon Tan 2015-04-24  163  	 * Writeback any data associated with the kernel mapping of this
1a70db49a73535 Ley Foon Tan 2015-04-24  164  	 * page.  This ensures that data in the physical page is mutually
1a70db49a73535 Ley Foon Tan 2015-04-24  165  	 * coherent with the kernels mapping.
1a70db49a73535 Ley Foon Tan 2015-04-24  166  	 */
1a70db49a73535 Ley Foon Tan 2015-04-24  167  	unsigned long start = (unsigned long)page_address(page);
1a70db49a73535 Ley Foon Tan 2015-04-24  168  
8e3d7c834ba0f7 Ley Foon Tan 2015-11-26  169  	__flush_dcache(start, start + PAGE_SIZE);
1a70db49a73535 Ley Foon Tan 2015-04-24  170  }
1a70db49a73535 Ley Foon Tan 2015-04-24  171  
93c91cb228e76b Ley Foon Tan 2014-11-06  172  void flush_dcache_page(struct page *page)
93c91cb228e76b Ley Foon Tan 2014-11-06  173  {
93c91cb228e76b Ley Foon Tan 2014-11-06  174  	struct address_space *mapping;
93c91cb228e76b Ley Foon Tan 2014-11-06  175  
93c91cb228e76b Ley Foon Tan 2014-11-06  176  	/*
93c91cb228e76b Ley Foon Tan 2014-11-06  177  	 * The zero page is never written to, so never has any dirty
93c91cb228e76b Ley Foon Tan 2014-11-06  178  	 * cache lines, and therefore never needs to be flushed.
93c91cb228e76b Ley Foon Tan 2014-11-06  179  	 */
93c91cb228e76b Ley Foon Tan 2014-11-06  180  	if (page == ZERO_PAGE(0))
93c91cb228e76b Ley Foon Tan 2014-11-06  181  		return;
93c91cb228e76b Ley Foon Tan 2014-11-06  182  
cb9f753a3731f7 Huang Ying   2018-04-05 @183  	mapping = page_mapping_file(page);
93c91cb228e76b Ley Foon Tan 2014-11-06  184  
93c91cb228e76b Ley Foon Tan 2014-11-06  185  	/* Flush this page if there are aliases. */
93c91cb228e76b Ley Foon Tan 2014-11-06  186  	if (mapping && !mapping_mapped(mapping)) {
93c91cb228e76b Ley Foon Tan 2014-11-06  187  		clear_bit(PG_dcache_clean, &page->flags);
93c91cb228e76b Ley Foon Tan 2014-11-06  188  	} else {
1a70db49a73535 Ley Foon Tan 2015-04-24  189  		__flush_dcache_page(mapping, page);
1a70db49a73535 Ley Foon Tan 2015-04-24  190  		if (mapping) {
93c91cb228e76b Ley Foon Tan 2014-11-06  191  			unsigned long start = (unsigned long)page_address(page);
93c91cb228e76b Ley Foon Tan 2014-11-06  192  			flush_aliases(mapping,  page);
1a70db49a73535 Ley Foon Tan 2015-04-24  193  			flush_icache_range(start, start + PAGE_SIZE);
1a70db49a73535 Ley Foon Tan 2015-04-24  194  		}
93c91cb228e76b Ley Foon Tan 2014-11-06  195  		set_bit(PG_dcache_clean, &page->flags);
93c91cb228e76b Ley Foon Tan 2014-11-06  196  	}
93c91cb228e76b Ley Foon Tan 2014-11-06  197  }
93c91cb228e76b Ley Foon Tan 2014-11-06  198  EXPORT_SYMBOL(flush_dcache_page);
93c91cb228e76b Ley Foon Tan 2014-11-06  199  

---
0-DAY CI Kernel Test Service, Intel Corporation
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