linux-kernel - fs/xfs/xfs_file.c:1266:31: sparse: sparse: incorrect type in return expression (different base types)

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Message-ID: <202210242350.wz5psCFs-lkp@intel.com>
Date:   Tue, 25 Oct 2022 00:01:15 +0800
From:   kernel test robot <lkp@...el.com>
To:     Shiyang Ruan <ruansy.fnst@...itsu.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        "Darrick J. Wong" <djwong@...nel.org>
Subject: 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/torvalds/linux.git master
head:   247f34f7b80357943234f93f247a1ae6b6c3a740
commit: ea6c49b784f0998297fb206af81c28dfaf8bb343 xfs: support CoW in fsdax mode
date:   3 months ago
config: arm64-randconfig-s031-20221024
compiler: aarch64-linux-gcc (GCC) 12.1.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.4-39-gce1a6720-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ea6c49b784f0998297fb206af81c28dfaf8bb343
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout ea6c49b784f0998297fb206af81c28dfaf8bb343
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=arm64 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: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
   fs/xfs/xfs_file.c: note: in included file (through include/linux/irqflags.h, include/linux/spinlock.h, include/linux/mmzone.h, ...):
   arch/arm64/include/asm/percpu.h:127:1: sparse: sparse: cast truncates bits from constant value (ffffffff becomes ff)
   arch/arm64/include/asm/percpu.h:127:1: sparse: sparse: cast truncates bits from constant value (ffffffff becomes ffff)
   arch/arm64/include/asm/percpu.h:127:1: sparse: sparse: cast truncates bits from constant value (ffffffff becomes ff)
   arch/arm64/include/asm/percpu.h:127:1: sparse: sparse: cast truncates bits from constant value (ffffffff becomes ffff)

vim +1266 fs/xfs/xfs_file.c

  1257	
  1258	#ifdef CONFIG_FS_DAX
  1259	static 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	static 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	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp

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