[linux-next:master 4824/8441] fs/btrfs/extent_io.c:230:16: warning: variable 'pages_processed' set but not used

[linux-next:master 4824/8441] fs/btrfs/extent_io.c:230:16: warning: variable 'pages_processed' set but not used

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   21ef7b1e17d039053edaeaf41142423810572741
commit: e74cd6ee58375cbdd85c01c93f75e34133ebea4d [4824/8441] btrfs: split page locking out of __process_pages_contig
config: powerpc-randconfig-r031-20230811 (https://download.01.org/0day-ci/archive/20230811/202308111822.ITiKYDqp-lkp@intel.com/config)
compiler: clang version 16.0.4 (https://github.com/llvm/llvm-project.git ae42196bc493ffe877a7e3dff8be32035dea4d07)
reproduce: (https://download.01.org/0day-ci/archive/20230811/202308111822.ITiKYDqp-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/202308111822.ITiKYDqp-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> fs/btrfs/extent_io.c:230:16: warning: variable 'pages_processed' set but not used [-Wunused-but-set-variable]
           unsigned long pages_processed = 0;
                         ^
   1 warning generated.


vim +/pages_processed +230 fs/btrfs/extent_io.c

ed8f13bf4a2ccb Qu Wenruo             2021-05-31  221  
e74cd6ee58375c Christoph Hellwig     2023-06-28  222  static void __process_pages_contig(struct address_space *mapping,
e74cd6ee58375c Christoph Hellwig     2023-06-28  223  				   struct page *locked_page, u64 start, u64 end,
e74cd6ee58375c Christoph Hellwig     2023-06-28  224  				   unsigned long page_ops)
ed8f13bf4a2ccb Qu Wenruo             2021-05-31  225  {
e38992be1f6cf3 Qu Wenruo             2021-05-31  226  	struct btrfs_fs_info *fs_info = btrfs_sb(mapping->host->i_sb);
ed8f13bf4a2ccb Qu Wenruo             2021-05-31  227  	pgoff_t start_index = start >> PAGE_SHIFT;
ed8f13bf4a2ccb Qu Wenruo             2021-05-31  228  	pgoff_t end_index = end >> PAGE_SHIFT;
ed8f13bf4a2ccb Qu Wenruo             2021-05-31  229  	pgoff_t index = start_index;
ed8f13bf4a2ccb Qu Wenruo             2021-05-31 @230  	unsigned long pages_processed = 0;
04c6b79ae4f0bc Vishal Moola (Oracle  2022-08-23  231) 	struct folio_batch fbatch;
ed8f13bf4a2ccb Qu Wenruo             2021-05-31  232  	int i;
ed8f13bf4a2ccb Qu Wenruo             2021-05-31  233  
04c6b79ae4f0bc Vishal Moola (Oracle  2022-08-23  234) 	folio_batch_init(&fbatch);
04c6b79ae4f0bc Vishal Moola (Oracle  2022-08-23  235) 	while (index <= end_index) {
04c6b79ae4f0bc Vishal Moola (Oracle  2022-08-23  236) 		int found_folios;
04c6b79ae4f0bc Vishal Moola (Oracle  2022-08-23  237) 
04c6b79ae4f0bc Vishal Moola (Oracle  2022-08-23  238) 		found_folios = filemap_get_folios_contig(mapping, &index,
04c6b79ae4f0bc Vishal Moola (Oracle  2022-08-23  239) 				end_index, &fbatch);
04c6b79ae4f0bc Vishal Moola (Oracle  2022-08-23  240) 		for (i = 0; i < found_folios; i++) {
04c6b79ae4f0bc Vishal Moola (Oracle  2022-08-23  241) 			struct folio *folio = fbatch.folios[i];
e74cd6ee58375c Christoph Hellwig     2023-06-28  242  
e74cd6ee58375c Christoph Hellwig     2023-06-28  243  			process_one_page(fs_info, &folio->page, locked_page,
e74cd6ee58375c Christoph Hellwig     2023-06-28  244  					 page_ops, start, end);
04c6b79ae4f0bc Vishal Moola (Oracle  2022-08-23  245) 			pages_processed += folio_nr_pages(folio);
ed8f13bf4a2ccb Qu Wenruo             2021-05-31  246  		}
04c6b79ae4f0bc Vishal Moola (Oracle  2022-08-23  247) 		folio_batch_release(&fbatch);
ed8f13bf4a2ccb Qu Wenruo             2021-05-31  248  		cond_resched();
ed8f13bf4a2ccb Qu Wenruo             2021-05-31  249  	}
ed8f13bf4a2ccb Qu Wenruo             2021-05-31  250  }
da2c7009f6cafe Liu Bo                2017-02-10  251  

:::::: The code at line 230 was first introduced by commit
:::::: ed8f13bf4a2ccb6c90d3210421455c2ceae678de btrfs: refactor page status update into process_one_page()

:::::: TO: Qu Wenruo <wqu@suse.com>
:::::: CC: David Sterba <dsterba@suse.com>

-- 
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https://github.com/intel/lkp-tests/wiki