[djwong-xfs:vectorized-scrub 242/312] fs/xfs/scrub/rtrmap_repair.c:350:6: warning: variable 'error' is used uninitialized whenever 'if' condition is false

[djwong-xfs:vectorized-scrub 242/312] fs/xfs/scrub/rtrmap_repair.c:350:6: warning: variable 'error' is used uninitialized whenever 'if' condition is false

[kernel test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux.git vectorized-scrub
head:   1804f4671b76293a8a792e5be4e514cefc0f012f
commit: 28686c6c3ab632596568e0dbb4c56f955b0c3930 [242/312] xfs: online repair of the realtime rmap btree
config: hexagon-randconfig-r031-20211025 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project a461fa64bb37cffd73f683c74f6b0780379fc2ca)
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/djwong/xfs-linux.git/commit/?id=28686c6c3ab632596568e0dbb4c56f955b0c3930
        git remote add djwong-xfs https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux.git
        git fetch --no-tags djwong-xfs vectorized-scrub
        git checkout 28686c6c3ab632596568e0dbb4c56f955b0c3930
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=hexagon 

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/xfs/scrub/rtrmap_repair.c:350:6: warning: variable 'error' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
           if (XFS_IS_REALTIME_INODE(ip)) {
               ^~~~~~~~~~~~~~~~~~~~~~~~~
   fs/xfs/xfs_linux.h:241:2: note: expanded from macro 'XFS_IS_REALTIME_INODE'
           (((ip)->i_diflags & XFS_DIFLAG_REALTIME) &&     \
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   fs/xfs/scrub/rtrmap_repair.c:359:9: note: uninitialized use occurs here
           return error;
                  ^~~~~
   fs/xfs/scrub/rtrmap_repair.c:350:2: note: remove the 'if' if its condition is always true
           if (XFS_IS_REALTIME_INODE(ip)) {
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> fs/xfs/scrub/rtrmap_repair.c:350:6: warning: variable 'error' is used uninitialized whenever '&&' condition is false [-Wsometimes-uninitialized]
           if (XFS_IS_REALTIME_INODE(ip)) {
               ^~~~~~~~~~~~~~~~~~~~~~~~~
   fs/xfs/xfs_linux.h:241:3: note: expanded from macro 'XFS_IS_REALTIME_INODE'
           (((ip)->i_diflags & XFS_DIFLAG_REALTIME) &&     \
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   fs/xfs/scrub/rtrmap_repair.c:359:9: note: uninitialized use occurs here
           return error;
                  ^~~~~
   fs/xfs/scrub/rtrmap_repair.c:350:6: note: remove the '&&' if its condition is always true
           if (XFS_IS_REALTIME_INODE(ip)) {
               ^
   fs/xfs/xfs_linux.h:241:3: note: expanded from macro 'XFS_IS_REALTIME_INODE'
           (((ip)->i_diflags & XFS_DIFLAG_REALTIME) &&     \
            ^
   fs/xfs/scrub/rtrmap_repair.c:344:13: note: initialize the variable 'error' to silence this warning
           int                     error;
                                        ^
                                         = 0
   2 warnings generated.


vim +350 fs/xfs/scrub/rtrmap_repair.c

   336	
   337	/* Record reverse mappings for a file. */
   338	STATIC int
   339	xrep_rtrmap_scan_inode(
   340		struct xrep_rtrmap	*rr,
   341		struct xfs_inode	*ip)
   342	{
   343		unsigned int		lock_mode;
   344		int			error;
   345	
   346		xfs_ilock(ip, XFS_IOLOCK_SHARED | XFS_MMAPLOCK_SHARED);
   347		lock_mode = xfs_ilock_data_map_shared(ip);
   348	
   349		/* Check the data fork if it's on the realtime device. */
 > 350		if (XFS_IS_REALTIME_INODE(ip)) {
   351			error = xrep_rtrmap_scan_dfork(rr, ip);
   352			if (error)
   353				goto out_unlock;
   354		}
   355	
   356		xchk_iscan_mark_visited(&rr->iscan, ip);
   357	out_unlock:
   358		xfs_iunlock(ip, XFS_IOLOCK_SHARED | XFS_MMAPLOCK_SHARED | lock_mode);
   359		return error;
   360	}
   361	

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

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