Re: [PATCH 12/12] shmem: add large folio support to the write and fallocate paths

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

Hi Daniel,

kernel test robot noticed the following build warnings:

[auto build test WARNING on akpm-mm/mm-everything]
[also build test WARNING on xfs-linux/for-next brauner-vfs/vfs.all linus/master v6.9 next-20240515]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Daniel-Gomez/splice-don-t-check-for-uptodate-if-partially-uptodate-is-impl/20240515-135925
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20240515055719.32577-13-da.gomez%40samsung.com
patch subject: [PATCH 12/12] shmem: add large folio support to the write and fallocate paths
config: openrisc-defconfig (https://download.01.org/0day-ci/archive/20240516/202405160245.2EBqOCyg-lkp@intel.com/config)
compiler: or1k-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240516/202405160245.2EBqOCyg-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/202405160245.2EBqOCyg-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> mm/shmem.c:1864: warning: Function parameter or struct member 'sbinfo' not described in 'shmem_mapping_size_order'
   mm/shmem.c:2427: warning: Function parameter or struct member 'len' not described in 'shmem_get_folio'


vim +1864 mm/shmem.c

  1845	
  1846	/**
  1847	 * shmem_mapping_size_order - Get maximum folio order for the given file size.
  1848	 * @mapping: Target address_space.
  1849	 * @index: The page index.
  1850	 * @size: The suggested size of the folio to create.
  1851	 *
  1852	 * This returns a high order for folios (when supported) based on the file size
  1853	 * which the mapping currently allows at the given index. The index is relevant
  1854	 * due to alignment considerations the mapping might have. The returned order
  1855	 * may be less than the size passed.
  1856	 *
  1857	 * Like __filemap_get_folio order calculation.
  1858	 *
  1859	 * Return: The order.
  1860	 */
  1861	static inline unsigned int
  1862	shmem_mapping_size_order(struct address_space *mapping, pgoff_t index,
  1863				 size_t size, struct shmem_sb_info *sbinfo)
> 1864	{
  1865		unsigned int order = ilog2(size);
  1866	
  1867		if ((order <= PAGE_SHIFT) ||
  1868		    (!mapping_large_folio_support(mapping) || !sbinfo->noswap))
  1869			return 0;
  1870	
  1871		order -= PAGE_SHIFT;
  1872	
  1873		/* If we're not aligned, allocate a smaller folio */
  1874		if (index & ((1UL << order) - 1))
  1875			order = __ffs(index);
  1876	
  1877		order = min_t(size_t, order, MAX_PAGECACHE_ORDER);
  1878	
  1879		/* Order-1 not supported due to THP dependency */
  1880		return (order == 1) ? 0 : order;
  1881	}
  1882	

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