tree:   https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git fscache-iter-2
head:   23676c28d1a9add6ea09f19ca89b71be994a4b79
commit: 1d11750d6c025faf5867ecb731a0f4a36b79ddf2 [53/67] fscache: Add support for writing to the cache
config: x86_64-randconfig-a002-20210928 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project dc6e8dfdfe7efecfda318d43a06fae18b40eb498)
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://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git/commit/?id=1d11750d6c025faf5867ecb731a0f4a36b79ddf2
        git remote add dhowells-fs https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git
        git fetch --no-tags dhowells-fs fscache-iter-2
        git checkout 1d11750d6c025faf5867ecb731a0f4a36b79ddf2
        # save the attached .config to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash fs/fscache/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

   fs/fscache/io.c:26: warning: Function parameter or member 'cres' not described in 'fscache_wait_for_operation'
   fs/fscache/io.c:26: warning: Excess function parameter 'cookie' description in 'fscache_wait_for_operation'
>> fs/fscache/io.c:306: warning: expecting prototype for fscache_clear_page_bits(). Prototype was for __fscache_clear_page_bits() instead
>> fs/fscache/io.c:367: warning: expecting prototype for fscache_write_to_cache(). Prototype was for __fscache_write_to_cache() instead


vim +306 fs/fscache/io.c

   294	
   295	/**
   296	 * fscache_clear_page_bits - Clear the PG_fscache bits from a set of pages
   297	 * @mapping: The netfs inode to use as the source
   298	 * @start: The start position in @mapping
   299	 * @len: The amount of data to unlock
   300	 *
   301	 * Clear the PG_fscache flag from a sequence of pages and wake up anyone who's
   302	 * waiting.
   303	 */
   304	void __fscache_clear_page_bits(struct address_space *mapping,
   305				       loff_t start, size_t len)
 > 306	{
   307		pgoff_t first = start / PAGE_SIZE;
   308		pgoff_t last = (start + len - 1) / PAGE_SIZE;
   309		struct page *page;
   310	
   311		if (len) {
   312			XA_STATE(xas, &mapping->i_pages, first);
   313	
   314			rcu_read_lock();
   315			xas_for_each(&xas, page, last) {
   316				end_page_fscache(page);
   317			}
   318			rcu_read_unlock();
   319		}
   320	}
   321	EXPORT_SYMBOL(__fscache_clear_page_bits);
   322	
   323	/*
   324	 * Deal with the completion of writing the data to the cache.
   325	 */
   326	static void fscache_wreq_done(void *priv, ssize_t transferred_or_error,
   327				      bool was_async)
   328	{
   329		struct fscache_write_request *wreq = priv;
   330	
   331		fscache_clear_page_bits(wreq->mapping, wreq->start, wreq->len);
   332	
   333		if (wreq->term_func)
   334			wreq->term_func(wreq->term_func_priv, transferred_or_error,
   335					was_async);
   336		fscache_end_operation(&wreq->cache_resources);
   337		kfree(wreq);
   338	}
   339	
   340	/**
   341	 * fscache_write_to_cache - Save a write to the cache and clear PG_fscache
   342	 * @cookie: The cookie representing the cache object
   343	 * @mapping: The netfs inode to use as the source
   344	 * @start: The start position in @mapping
   345	 * @len: The amount of data to write back
   346	 * @i_size: The new size of the inode
   347	 * @term_func: The function to call upon completion
   348	 * @term_func_priv: The private data for @term_func
   349	 *
   350	 * Helper function for a netfs to write dirty data from an inode into the cache
   351	 * object that's backing it.
   352	 *
   353	 * @start and @len describe the range of the data.  This does not need to be
   354	 * page-aligned, but to satisfy DIO requirements, the cache may expand it up to
   355	 * the page boundaries on either end.  All the pages covering the range must be
   356	 * marked with PG_fscache.
   357	 *
   358	 * If given, @term_func will be called upon completion and supplied with
   359	 * @term_func_priv.  Note that the PG_fscache flags will have been cleared by
   360	 * this point, so the netfs must retain its own pin on the mapping.
   361	 */
   362	void __fscache_write_to_cache(struct fscache_cookie *cookie,
   363				      struct address_space *mapping,
   364				      loff_t start, size_t len, loff_t i_size,
   365				      netfs_io_terminated_t term_func,
   366				      void *term_func_priv)
 > 367	{

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org