Messages in this thread | | | Date | Sat, 27 Nov 2021 21:09:21 +0800 | Subject | [djwong-xfs:direct-xfile-mapped-buffers 103/333] fs/xfs/xfs_rtalloc.c:1439:17: warning: Value stored to 'off' during its initialization is never read [clang-analyzer-deadcode.DeadStores] | From | kernel test robot <> |
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tree: https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux.git direct-xfile-mapped-buffers head: 014cdddffcddd5b13402721de744b9ea76961d74 commit: bd7fa0e8c47bcda25664e1b2572d33a8d61d29c3 [103/333] xfs: make atomic extent swapping support realtime files config: i386-randconfig-c001-20211031 (https://download.01.org/0day-ci/archive/20211126/202111260911.JKJz6fEX-lkp@intel.com/config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project d321548c3ce987f4f21350ba1c81fdb5d4354224) 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=bd7fa0e8c47bcda25664e1b2572d33a8d61d29c3 git remote add djwong-xfs https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux.git git fetch --no-tags djwong-xfs direct-xfile-mapped-buffers git checkout bd7fa0e8c47bcda25664e1b2572d33a8d61d29c3 # save the config file to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=i386 clang-analyzer
If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@intel.com>
clang-analyzer warnings: (new ones prefixed by >>)
>> fs/xfs/xfs_rtalloc.c:1439:17: warning: Value stored to 'off' during its initialization is never read [clang-analyzer-deadcode.DeadStores] xfs_fileoff_t off = XFS_B_TO_FSBT(mp, pos); ^~~
vim +/off +1439 fs/xfs/xfs_rtalloc.c
bd7fa0e8c47bcda Darrick J. Wong 2021-09-01 1422 bd7fa0e8c47bcda Darrick J. Wong 2021-09-01 1423 /* bd7fa0e8c47bcda Darrick J. Wong 2021-09-01 1424 * For all realtime extents backing the given range of a file, search for bd7fa0e8c47bcda Darrick J. Wong 2021-09-01 1425 * unwritten mappings that are do not cover a full rt extent and convert them bd7fa0e8c47bcda Darrick J. Wong 2021-09-01 1426 * to zeroed written mappings. The goal is to end up with one mapping per rt bd7fa0e8c47bcda Darrick J. Wong 2021-09-01 1427 * extent so that we can perform a remapping operation. Callers must ensure bd7fa0e8c47bcda Darrick J. Wong 2021-09-01 1428 * that there are no dirty pages in the given range. bd7fa0e8c47bcda Darrick J. Wong 2021-09-01 1429 */ bd7fa0e8c47bcda Darrick J. Wong 2021-09-01 1430 int bd7fa0e8c47bcda Darrick J. Wong 2021-09-01 1431 xfs_rtfile_convert_unwritten( bd7fa0e8c47bcda Darrick J. Wong 2021-09-01 1432 struct xfs_inode *ip, bd7fa0e8c47bcda Darrick J. Wong 2021-09-01 1433 loff_t pos, bd7fa0e8c47bcda Darrick J. Wong 2021-09-01 1434 uint64_t len) bd7fa0e8c47bcda Darrick J. Wong 2021-09-01 1435 { bd7fa0e8c47bcda Darrick J. Wong 2021-09-01 1436 struct xfs_bmbt_irec irec; bd7fa0e8c47bcda Darrick J. Wong 2021-09-01 1437 struct xfs_trans *tp; bd7fa0e8c47bcda Darrick J. Wong 2021-09-01 1438 struct xfs_mount *mp = ip->i_mount; bd7fa0e8c47bcda Darrick J. Wong 2021-09-01 @1439 xfs_fileoff_t off = XFS_B_TO_FSBT(mp, pos); bd7fa0e8c47bcda Darrick J. Wong 2021-09-01 1440 xfs_fileoff_t endoff; bd7fa0e8c47bcda Darrick J. Wong 2021-09-01 1441 unsigned int resblks; bd7fa0e8c47bcda Darrick J. Wong 2021-09-01 1442 int ret; bd7fa0e8c47bcda Darrick J. Wong 2021-09-01 1443 bd7fa0e8c47bcda Darrick J. Wong 2021-09-01 1444 if (mp->m_sb.sb_rextsize == 1) bd7fa0e8c47bcda Darrick J. Wong 2021-09-01 1445 return 0; bd7fa0e8c47bcda Darrick J. Wong 2021-09-01 1446 bd7fa0e8c47bcda Darrick J. Wong 2021-09-01 @1447 off = rounddown_64(XFS_B_TO_FSBT(mp, pos), mp->m_sb.sb_rextsize); bd7fa0e8c47bcda Darrick J. Wong 2021-09-01 1448 endoff = roundup_64(XFS_B_TO_FSB(mp, pos + len), mp->m_sb.sb_rextsize);
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