[dhowells-fs:netfs-next 33/36] fs/netfs/write_collect.c:204:4: error: call to undeclared function 'mempool_free'; ISO C99 and later do not support implicit function declarations

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git netfs-next
head:   8f0e78ba82ccca8613b01c5f0215f8ce7c7c5cf3
commit: e09967cf018fd9ee7f1324d6ccea2d0a5f6b0f46 [33/36] netfs: Rework writeback to use a separate list of regions to be unlocked
config: i386-randconfig-141-20260826 (https://download.01.org/0day-ci/archive/20260826/[email protected]/config)
compiler: clang version 22.1.3 (https://github.com/llvm/llvm-project e9846648fd6183ee6d8cbdb4502213fcf902a211)
smatch: v0.5.0-9187-g5189e3fb
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260826/[email protected]/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 <[email protected]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/

All errors (new ones prefixed by >>):

>> fs/netfs/write_collect.c:204:4: error: call to undeclared function 'mempool_free'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     204 |                         mempool_free(wback, &netfs_bvecq_pool);
         |                         ^
   1 error generated.
--
>> fs/netfs/write_issue.c:795:11: error: call to undeclared function 'mempool_alloc'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     795 |                 wback = mempool_alloc(&netfs_writeback_pool, wreq->gfp);
         |                         ^
>> fs/netfs/write_issue.c:795:9: error: incompatible integer to pointer conversion assigning to 'struct netfs_writeback *' from 'int' [-Wint-conversion]
     795 |                 wback = mempool_alloc(&netfs_writeback_pool, wreq->gfp);
         |                       ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   2 errors generated.


vim +/mempool_free +204 fs/netfs/write_collect.c

   163	
   164	/*
   165	 * Unlock any folios we've finished with.
   166	 */
   167	static void netfs_writeback_unlock_folios(struct netfs_io_request *wreq,
   168						  unsigned int *notes)
   169	{
   170		struct netfs_writeback *wback, *next;
   171	
   172		if (wreq->origin == NETFS_PGPRIV2_COPY_TO_CACHE) {
   173			if (netfs_pgpriv2_unlock_copied_folios(wreq))
   174				*notes |= MADE_PROGRESS;
   175			return;
   176		}
   177	
   178		wback = wreq->writebacks;
   179	
   180		for (;;) {
   181			uoff_t stop_at;
   182			size_t len;
   183	
   184			/* Jump over discontiguities. */
   185			if (wreq->cleaned_to < wback->start)
   186				wreq->cleaned_to = wback->start;
   187	
   188			if (wreq->collected_to <= wreq->cleaned_to)
   189				break;
   190	
   191			/* Order read of region length before reading folios. */
   192			len = smp_load_acquire(&wback->len);
   193	
   194			if (wreq->cleaned_to >= wback->start + len) {
   195				/* Order read of next before recheck length. */
   196				next = smp_load_acquire(&wback->next);
   197				if (!next)
   198					break; /* We don't remove the tail writeback. */
   199	
   200				/* Order read of region length before reading folios. */
   201				if (len != smp_load_acquire(&wback->len))
   202					continue; /* len/next update race. */
   203	
 > 204				mempool_free(wback, &netfs_bvecq_pool);
   205				wreq->writebacks = next;
   206				wback = next;
   207				continue;
   208			}
   209	
   210			stop_at = min(wreq->collected_to, wback->start + len);
   211	
   212			trace_netfs_collect_folios(wreq, wback->start, len);
   213			if (!folio_end_writeback_range(wreq->mapping, &wreq->cleaned_to, stop_at,
   214						       netfs_folio_written_back, wreq))
   215				break;
   216			*notes |= MADE_PROGRESS;
   217		}
   218	}
   219	

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