linux-kernel - [linux-next:master 728/1207] fs/xfs/xfs_file.c:1266:31: sparse: sparse: incorrect type in return expression (different base types)

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Date:   Tue, 7 Jun 2022 15:09:18 +0800
From:   kernel test robot <lkp@...el.com>
To:     Shiyang Ruan <ruansy.fnst@...itsu.com>
Cc:     kbuild-all@...ts.01.org,
        Linux Memory Management List <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Darrick J. Wong" <djwong@...nel.org>, linux-xfs@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [linux-next:master 728/1207] fs/xfs/xfs_file.c:1266:31: sparse:
 sparse: incorrect type in return expression (different base types)

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   73d0e32571a0786151eb72634f1a4c5891166176
commit: d5f5b32dee7c09e3152cbbce45c73f0b1ea7d94c [728/1207] xfs: support CoW in fsdax mode
config: x86_64-rhel-8.3-kselftests (https://download.01.org/0day-ci/archive/20220607/202206071511.FI7WLdZo-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-1) 11.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.4-18-g56afb504-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=d5f5b32dee7c09e3152cbbce45c73f0b1ea7d94c
        git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
        git fetch --no-tags linux-next master
        git checkout d5f5b32dee7c09e3152cbbce45c73f0b1ea7d94c
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=x86_64 SHELL=/bin/bash fs/xfs/

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


sparse warnings: (new ones prefixed by >>)
>> fs/xfs/xfs_file.c:1266:31: sparse: sparse: incorrect type in return expression (different base types) @@     expected int @@     got restricted vm_fault_t @@
   fs/xfs/xfs_file.c:1266:31: sparse:     expected int
   fs/xfs/xfs_file.c:1266:31: sparse:     got restricted vm_fault_t
>> fs/xfs/xfs_file.c:1260:1: sparse: sparse: symbol 'xfs_dax_fault' was not declared. Should it be static?
>> fs/xfs/xfs_file.c:1314:21: sparse: sparse: incorrect type in assignment (different base types) @@     expected restricted vm_fault_t [usertype] ret @@     got int @@
   fs/xfs/xfs_file.c:1314:21: sparse:     expected restricted vm_fault_t [usertype] ret
   fs/xfs/xfs_file.c:1314:21: sparse:     got int

Please review and possibly fold the followup patch.

vim +1266 fs/xfs/xfs_file.c

  1257	
  1258	#ifdef CONFIG_FS_DAX
  1259	int
> 1260	xfs_dax_fault(
  1261		struct vm_fault		*vmf,
  1262		enum page_entry_size	pe_size,
  1263		bool			write_fault,
  1264		pfn_t			*pfn)
  1265	{
> 1266		return dax_iomap_fault(vmf, pe_size, pfn, NULL,
  1267				(write_fault && !vmf->cow_page) ?
  1268					&xfs_dax_write_iomap_ops :
  1269					&xfs_read_iomap_ops);
  1270	}
  1271	#else
  1272	int
  1273	xfs_dax_fault(
  1274		struct vm_fault		*vmf,
  1275		enum page_entry_size	pe_size,
  1276		bool			write_fault,
  1277		pfn_t			*pfn)
  1278	{
  1279		return 0;
  1280	}
  1281	#endif
  1282	
  1283	/*
  1284	 * Locking for serialisation of IO during page faults. This results in a lock
  1285	 * ordering of:
  1286	 *
  1287	 * mmap_lock (MM)
  1288	 *   sb_start_pagefault(vfs, freeze)
  1289	 *     invalidate_lock (vfs/XFS_MMAPLOCK - truncate serialisation)
  1290	 *       page_lock (MM)
  1291	 *         i_lock (XFS - extent map serialisation)
  1292	 */
  1293	static vm_fault_t
  1294	__xfs_filemap_fault(
  1295		struct vm_fault		*vmf,
  1296		enum page_entry_size	pe_size,
  1297		bool			write_fault)
  1298	{
  1299		struct inode		*inode = file_inode(vmf->vma->vm_file);
  1300		struct xfs_inode	*ip = XFS_I(inode);
  1301		vm_fault_t		ret;
  1302	
  1303		trace_xfs_filemap_fault(ip, pe_size, write_fault);
  1304	
  1305		if (write_fault) {
  1306			sb_start_pagefault(inode->i_sb);
  1307			file_update_time(vmf->vma->vm_file);
  1308		}
  1309	
  1310		if (IS_DAX(inode)) {
  1311			pfn_t pfn;
  1312	
  1313			xfs_ilock(XFS_I(inode), XFS_MMAPLOCK_SHARED);
> 1314			ret = xfs_dax_fault(vmf, pe_size, write_fault, &pfn);
  1315			if (ret & VM_FAULT_NEEDDSYNC)
  1316				ret = dax_finish_sync_fault(vmf, pe_size, pfn);
  1317			xfs_iunlock(XFS_I(inode), XFS_MMAPLOCK_SHARED);
  1318		} else {
  1319			if (write_fault) {
  1320				xfs_ilock(XFS_I(inode), XFS_MMAPLOCK_SHARED);
  1321				ret = iomap_page_mkwrite(vmf,
  1322						&xfs_buffered_write_iomap_ops);
  1323				xfs_iunlock(XFS_I(inode), XFS_MMAPLOCK_SHARED);
  1324			} else {
  1325				ret = filemap_fault(vmf);
  1326			}
  1327		}
  1328	
  1329		if (write_fault)
  1330			sb_end_pagefault(inode->i_sb);
  1331		return ret;
  1332	}
  1333	

-- 
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