linux-kernel - [dhowells-fs:fscache-iter-2 57/68] fs/fscache/io.c:235: warning: expecting prototype for fscache_clear_page_bits(). Prototype was for __fscache_clear_page

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Message-ID: <202107130542.3tT0dBc4-lkp@intel.com>
Date:   Tue, 13 Jul 2021 05:10:45 +0800
From:   kernel test robot <lkp@...el.com>
To:     David Howells <dhowells@...hat.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: [dhowells-fs:fscache-iter-2 57/68] fs/fscache/io.c:235: warning:
 expecting prototype for fscache_clear_page_bits(). Prototype was for
 __fscache_clear_page_bits() instead

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git fscache-iter-2
head:   d45090b191774b11ecfe2421f5619827aa08ad00
commit: e29afe6f941d92e05bfaf15c9fcb4fbc4760244f [57/68] fscache: Add support for writing to the cache
config: m68k-buildonly-randconfig-r005-20210712 (attached as .config)
compiler: m68k-linux-gcc (GCC) 9.3.0
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=e29afe6f941d92e05bfaf15c9fcb4fbc4760244f
        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 e29afe6f941d92e05bfaf15c9fcb4fbc4760244f
        # save the attached .config to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross O=build_dir ARCH=m68k SHELL=/bin/bash drivers/nvme/target/ fs/fscache/

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

All warnings (new ones prefixed by >>):

   fs/fscache/io.c:25: warning: Function parameter or member 'cres' not described in 'fscache_wait_for_operation'
   fs/fscache/io.c:25: warning: Excess function parameter 'cookie' description in 'fscache_wait_for_operation'
>> fs/fscache/io.c:235: warning: expecting prototype for fscache_clear_page_bits(). Prototype was for __fscache_clear_page_bits() instead
>> fs/fscache/io.c:296: warning: expecting prototype for fscache_write_to_cache(). Prototype was for __fscache_write_to_cache() instead


vim +235 fs/fscache/io.c

   223	
   224	/**
   225	 * fscache_clear_page_bits - Clear the PG_fscache bits from a set of pages
   226	 * @mapping: The netfs inode to use as the source
   227	 * @start: The start position in @mapping
   228	 * @len: The amount of data to unlock
   229	 *
   230	 * Clear the PG_fscache flag from a sequence of pages and wake up anyone who's
   231	 * waiting.
   232	 */
   233	void __fscache_clear_page_bits(struct address_space *mapping,
   234				       loff_t start, size_t len)
 > 235	{
   236		pgoff_t first = start / PAGE_SIZE;
   237		pgoff_t last = (start + len - 1) / PAGE_SIZE;
   238		struct page *page;
   239	
   240		if (len) {
   241			XA_STATE(xas, &mapping->i_pages, first);
   242	
   243			rcu_read_lock();
   244			xas_for_each(&xas, page, last) {
   245				end_page_fscache(page);
   246			}
   247			rcu_read_unlock();
   248		}
   249	}
   250	EXPORT_SYMBOL(__fscache_clear_page_bits);
   251	
   252	/*
   253	 * Deal with the completion of writing the data to the cache.
   254	 */
   255	static void fscache_wreq_done(void *priv, ssize_t transferred_or_error,
   256				      bool was_async)
   257	{
   258		struct fscache_write_request *wreq = priv;
   259	
   260		fscache_clear_page_bits(wreq->mapping, wreq->start, wreq->len);
   261	
   262		if (wreq->term_func)
   263			wreq->term_func(wreq->term_func_priv, transferred_or_error,
   264					was_async);
   265		fscache_end_operation(&wreq->cache_resources);
   266		kfree(wreq);
   267	}
   268	
   269	/**
   270	 * fscache_write_to_cache - Save a write to the cache and clear PG_fscache
   271	 * @cookie: The cookie representing the cache object
   272	 * @mapping: The netfs inode to use as the source
   273	 * @start: The start position in @mapping
   274	 * @len: The amount of data to write back
   275	 * @i_size: The new size of the inode
   276	 * @term_func: The function to call upon completion
   277	 * @term_func_priv: The private data for @term_func
   278	 *
   279	 * Helper function for a netfs to write dirty data from an inode into the cache
   280	 * object that's backing it.
   281	 *
   282	 * @start and @len describe the range of the data.  This does not need to be
   283	 * page-aligned, but to satisfy DIO requirements, the cache may expand it up to
   284	 * the page boundaries on either end.  All the pages covering the range must be
   285	 * marked with PG_fscache.
   286	 *
   287	 * If given, @term_func will be called upon completion and supplied with
   288	 * @term_func_priv.  Note that the PG_fscache flags will have been cleared by
   289	 * this point, so the netfs must retain its own pin on the mapping.
   290	 */
   291	void __fscache_write_to_cache(struct fscache_cookie *cookie,
   292				      struct address_space *mapping,
   293				      loff_t start, size_t len, loff_t i_size,
   294				      netfs_io_terminated_t term_func,
   295				      void *term_func_priv)
 > 296	{

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

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