[openeuler:OLK-5.10 2882/2882] fs/cachefiles/xattr.c:221:5: warning: no previous prototype for 'cachefiles_check_old_object_xattr'

[openeuler:OLK-5.10 2882/2882] fs/cachefiles/xattr.c:221:5: warning: no previous prototype for 'cachefiles_check_old_object_xattr'

[kernel test robot]

tree:   https://gitee.com/openeuler/kernel.git OLK-5.10
head:   b5ec139da1a4916dfc9644ee3d9426dbd6f23c13
commit: 62cbbf255badab153207e0a54d04da8c345ae307 [2882/2882] cachefiles: use mainline xattr in ondemand mode
config: x86_64-buildonly-randconfig-2003-20250502 (https://download.01.org/0day-ci/archive/20250604/202506041414.VCeF5Rgv-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250604/202506041414.VCeF5Rgv-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/202506041414.VCeF5Rgv-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> fs/cachefiles/xattr.c:221:5: warning: no previous prototype for 'cachefiles_check_old_object_xattr' [-Wmissing-prototypes]
     221 | int cachefiles_check_old_object_xattr(struct cachefiles_object *object,
         |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/cachefiles_check_old_object_xattr +221 fs/cachefiles/xattr.c

   220	
 > 221	int cachefiles_check_old_object_xattr(struct cachefiles_object *object,
   222					      struct cachefiles_xattr *auxdata)
   223	{
   224		struct cachefiles_xattr *auxbuf;
   225		unsigned int len = sizeof(struct cachefiles_xattr) + 512;
   226		struct dentry *dentry = object->dentry;
   227		int ret;
   228	
   229		auxbuf = kmalloc(len, cachefiles_gfp);
   230		if (!auxbuf)
   231			return -ENOMEM;
   232	
   233		/* read the current type label */
   234		ret = vfs_getxattr(dentry, cachefiles_xattr_cache,
   235				   &auxbuf->type, 512 + 1);
   236		if (ret < 0)
   237			goto error;
   238	
   239		/* check the on-disk object */
   240		if (ret < 1) {
   241			pr_err("Cache object %lu xattr length incorrect\n",
   242			       d_backing_inode(dentry)->i_ino);
   243			goto stale;
   244		}
   245	
   246		if (auxbuf->type != auxdata->type)
   247			goto stale;
   248	
   249		auxbuf->len = ret;
   250	
   251		/* consult the netfs */
   252		if (object->fscache.cookie->def->check_aux) {
   253			enum fscache_checkaux result;
   254			unsigned int dlen;
   255	
   256			dlen = auxbuf->len - 1;
   257	
   258			_debug("checkaux %s #%u",
   259			       object->fscache.cookie->def->name, dlen);
   260	
   261			result = fscache_check_aux(&object->fscache,
   262						   &auxbuf->data, dlen,
   263						   i_size_read(d_backing_inode(dentry)));
   264	
   265			switch (result) {
   266				/* entry okay as is */
   267			case FSCACHE_CHECKAUX_OKAY:
   268				goto okay;
   269	
   270				/* entry requires update */
   271			case FSCACHE_CHECKAUX_NEEDS_UPDATE:
   272				break;
   273	
   274				/* entry requires deletion */
   275			case FSCACHE_CHECKAUX_OBSOLETE:
   276				goto stale;
   277	
   278			default:
   279				BUG();
   280			}
   281	
   282			/* update the current label */
   283			ret = vfs_setxattr(dentry, cachefiles_xattr_cache,
   284					   &auxdata->type, auxdata->len,
   285					   XATTR_REPLACE);
   286			if (ret < 0) {
   287				cachefiles_io_error_obj(object,
   288							"Can't update xattr on %lu"
   289							" (error %d)",
   290							d_backing_inode(dentry)->i_ino, -ret);
   291				goto error;
   292			}
   293		}
   294	
   295	okay:
   296		ret = 0;
   297	
   298	error:
   299		kfree(auxbuf);
   300		return ret;
   301	
   302	stale:
   303		ret = -ESTALE;
   304		goto error;
   305	}
   306	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki