Re: [PATCH 11/12] shmem: add file length arg in shmem_get_folio() path

[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/20240515055719.32577-12-da.gomez%40samsung.com
patch subject: [PATCH 11/12] shmem: add file length arg in shmem_get_folio() path
config: openrisc-defconfig (https://download.01.org/0day-ci/archive/20240516/202405160144.a9ad9CX5-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/20240516/202405160144.a9ad9CX5-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/202405160144.a9ad9CX5-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> mm/shmem.c:2382: warning: Function parameter or struct member 'len' not described in 'shmem_get_folio'


vim +2382 mm/shmem.c

^1da177e4c3f41 Linus Torvalds          2005-04-16  2356  
d7468609ee0f90 Christoph Hellwig       2024-02-19  2357  /**
d7468609ee0f90 Christoph Hellwig       2024-02-19  2358   * shmem_get_folio - find, and lock a shmem folio.
d7468609ee0f90 Christoph Hellwig       2024-02-19  2359   * @inode:	inode to search
d7468609ee0f90 Christoph Hellwig       2024-02-19  2360   * @index:	the page index.
d7468609ee0f90 Christoph Hellwig       2024-02-19  2361   * @foliop:	pointer to the folio if found
d7468609ee0f90 Christoph Hellwig       2024-02-19  2362   * @sgp:	SGP_* flags to control behavior
d7468609ee0f90 Christoph Hellwig       2024-02-19  2363   *
d7468609ee0f90 Christoph Hellwig       2024-02-19  2364   * Looks up the page cache entry at @inode & @index.  If a folio is
d7468609ee0f90 Christoph Hellwig       2024-02-19  2365   * present, it is returned locked with an increased refcount.
d7468609ee0f90 Christoph Hellwig       2024-02-19  2366   *
9d8b36744935f8 Christoph Hellwig       2024-02-19  2367   * If the caller modifies data in the folio, it must call folio_mark_dirty()
9d8b36744935f8 Christoph Hellwig       2024-02-19  2368   * before unlocking the folio to ensure that the folio is not reclaimed.
9d8b36744935f8 Christoph Hellwig       2024-02-19  2369   * There is no need to reserve space before calling folio_mark_dirty().
9d8b36744935f8 Christoph Hellwig       2024-02-19  2370   *
d7468609ee0f90 Christoph Hellwig       2024-02-19  2371   * When no folio is found, the behavior depends on @sgp:
8d4dd9d741c330 Akira Yokosawa          2024-02-27  2372   *  - for SGP_READ, *@foliop is %NULL and 0 is returned
8d4dd9d741c330 Akira Yokosawa          2024-02-27  2373   *  - for SGP_NOALLOC, *@foliop is %NULL and -ENOENT is returned
d7468609ee0f90 Christoph Hellwig       2024-02-19  2374   *  - for all other flags a new folio is allocated, inserted into the
d7468609ee0f90 Christoph Hellwig       2024-02-19  2375   *    page cache and returned locked in @foliop.
d7468609ee0f90 Christoph Hellwig       2024-02-19  2376   *
d7468609ee0f90 Christoph Hellwig       2024-02-19  2377   * Context: May sleep.
d7468609ee0f90 Christoph Hellwig       2024-02-19  2378   * Return: 0 if successful, else a negative error code.
d7468609ee0f90 Christoph Hellwig       2024-02-19  2379   */
4e1fc793ad9892 Matthew Wilcox (Oracle  2022-09-02  2380) int shmem_get_folio(struct inode *inode, pgoff_t index, struct folio **foliop,
02efe2fbe45ffd Daniel Gomez            2024-05-15  2381  		enum sgp_type sgp, size_t len)
4e1fc793ad9892 Matthew Wilcox (Oracle  2022-09-02 @2382) {
4e1fc793ad9892 Matthew Wilcox (Oracle  2022-09-02  2383) 	return shmem_get_folio_gfp(inode, index, foliop, sgp,
02efe2fbe45ffd Daniel Gomez            2024-05-15  2384  			mapping_gfp_mask(inode->i_mapping), NULL, NULL, len);
4e1fc793ad9892 Matthew Wilcox (Oracle  2022-09-02  2385) }
d7468609ee0f90 Christoph Hellwig       2024-02-19  2386  EXPORT_SYMBOL_GPL(shmem_get_folio);
4e1fc793ad9892 Matthew Wilcox (Oracle  2022-09-02  2387) 

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