[kbuild-all] fs/xfs/xfs_trans.c:559:8: warning: variable 'error' set but not used

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 136057256686de39cc3a07c2e39ef6bc43003ff6 commit: dc3ffbb14060c943469d5e12900db3a60bc3fa64 xfs: gut error handling in xfs_trans_unreserve_and_mod_sb() date: 1 year, 6 months ago config: x86_64-randconfig-a015-20211118 (https://download.01.org/0day-ci/archive/20211124/202111240723.ALWlwQXv-lk...) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout dc3ffbb14060c943469d5e12900db3a60bc3fa64 # save the config file to linux build tree make W=1 ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): fs/xfs/xfs_trans.c: In function 'xfs_trans_unreserve_and_mod_sb': 559 | int error; | ^~~~~ vim +/error +559 fs/xfs/xfs_trans.c ^1da177e4c3f41 Linus Torvalds 2005-04-16 536 ^1da177e4c3f41 Linus Torvalds 2005-04-16 537 /* dc3ffbb14060c9 Dave Chinner 2020-05-20 538 * xfs_trans_unreserve_and_mod_sb() is called to release unused reservations and dc3ffbb14060c9 Dave Chinner 2020-05-20 539 * apply superblock counter changes to the in-core superblock. The 45c34141126a89 David Chinner 2007-06-18 540 * t_res_fdblocks_delta and t_res_frextents_delta fields are explicitly NOT 45c34141126a89 David Chinner 2007-06-18 541 * applied to the in-core superblock. The idea is that that has already been 45c34141126a89 David Chinner 2007-06-18 542 * done. ^1da177e4c3f41 Linus Torvalds 2005-04-16 543 * 45c34141126a89 David Chinner 2007-06-18 544 * If we are not logging superblock counters, then the inode allocated/free and 45c34141126a89 David Chinner 2007-06-18 545 * used block counts are not updated in the on disk superblock. In this case, 45c34141126a89 David Chinner 2007-06-18 546 * XFS_TRANS_SB_DIRTY will not be set when the transaction is updated but we 45c34141126a89 David Chinner 2007-06-18 547 * still need to update the incore superblock with the changes. ^1da177e4c3f41 Linus Torvalds 2005-04-16 548 */ 71e330b593905e Dave Chinner 2010-05-21 549 void ^1da177e4c3f41 Linus Torvalds 2005-04-16 550 xfs_trans_unreserve_and_mod_sb( 0bd5ddedccca44 Dave Chinner 2015-02-23 551 struct xfs_trans *tp) ^1da177e4c3f41 Linus Torvalds 2005-04-16 552 { 0bd5ddedccca44 Dave Chinner 2015-02-23 553 struct xfs_mount *mp = tp->t_mountp; 0d485ada404b36 Dave Chinner 2015-02-23 554 bool rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0; 45c34141126a89 David Chinner 2007-06-18 555 int64_t blkdelta = 0; 45c34141126a89 David Chinner 2007-06-18 556 int64_t rtxdelta = 0; 1b0407125f9a5b Christoph Hellwig 2010-09-30 557 int64_t idelta = 0; 1b0407125f9a5b Christoph Hellwig 2010-09-30 558 int64_t ifreedelta = 0; 0bd5ddedccca44 Dave Chinner 2015-02-23 @559 int error; ^1da177e4c3f41 Linus Torvalds 2005-04-16 560 1b0407125f9a5b Christoph Hellwig 2010-09-30 561 /* calculate deltas */ 45c34141126a89 David Chinner 2007-06-18 562 if (tp->t_blk_res > 0) 45c34141126a89 David Chinner 2007-06-18 563 blkdelta = tp->t_blk_res; 45c34141126a89 David Chinner 2007-06-18 564 if ((tp->t_fdblocks_delta != 0) && 45c34141126a89 David Chinner 2007-06-18 565 (xfs_sb_version_haslazysbcount(&mp->m_sb) || 45c34141126a89 David Chinner 2007-06-18 566 (tp->t_flags & XFS_TRANS_SB_DIRTY))) 45c34141126a89 David Chinner 2007-06-18 567 blkdelta += tp->t_fdblocks_delta; 45c34141126a89 David Chinner 2007-06-18 568 45c34141126a89 David Chinner 2007-06-18 569 if (tp->t_rtx_res > 0) 45c34141126a89 David Chinner 2007-06-18 570 rtxdelta = tp->t_rtx_res; 45c34141126a89 David Chinner 2007-06-18 571 if ((tp->t_frextents_delta != 0) && 45c34141126a89 David Chinner 2007-06-18 572 (tp->t_flags & XFS_TRANS_SB_DIRTY)) 45c34141126a89 David Chinner 2007-06-18 573 rtxdelta += tp->t_frextents_delta; 45c34141126a89 David Chinner 2007-06-18 574 1b0407125f9a5b Christoph Hellwig 2010-09-30 575 if (xfs_sb_version_haslazysbcount(&mp->m_sb) || 1b0407125f9a5b Christoph Hellwig 2010-09-30 576 (tp->t_flags & XFS_TRANS_SB_DIRTY)) { 1b0407125f9a5b Christoph Hellwig 2010-09-30 577 idelta = tp->t_icount_delta; 1b0407125f9a5b Christoph Hellwig 2010-09-30 578 ifreedelta = tp->t_ifree_delta; ^1da177e4c3f41 Linus Torvalds 2005-04-16 579 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 580 1b0407125f9a5b Christoph Hellwig 2010-09-30 581 /* apply the per-cpu counters */ 1b0407125f9a5b Christoph Hellwig 2010-09-30 582 if (blkdelta) { 0d485ada404b36 Dave Chinner 2015-02-23 583 error = xfs_mod_fdblocks(mp, blkdelta, rsvd); dc3ffbb14060c9 Dave Chinner 2020-05-20 584 ASSERT(!error); 1b0407125f9a5b Christoph Hellwig 2010-09-30 585 } 45c34141126a89 David Chinner 2007-06-18 586 1b0407125f9a5b Christoph Hellwig 2010-09-30 587 if (idelta) { 501ab323875339 Dave Chinner 2015-02-23 588 error = xfs_mod_icount(mp, idelta); dc3ffbb14060c9 Dave Chinner 2020-05-20 589 ASSERT(!error); ^1da177e4c3f41 Linus Torvalds 2005-04-16 590 } 1b0407125f9a5b Christoph Hellwig 2010-09-30 591 1b0407125f9a5b Christoph Hellwig 2010-09-30 592 if (ifreedelta) { e88b64ea1f3da6 Dave Chinner 2015-02-23 593 error = xfs_mod_ifree(mp, ifreedelta); dc3ffbb14060c9 Dave Chinner 2020-05-20 594 ASSERT(!error); ^1da177e4c3f41 Linus Torvalds 2005-04-16 595 } 1b0407125f9a5b Christoph Hellwig 2010-09-30 596 0bd5ddedccca44 Dave Chinner 2015-02-23 597 if (rtxdelta == 0 && !(tp->t_flags & XFS_TRANS_SB_DIRTY)) 0bd5ddedccca44 Dave Chinner 2015-02-23 598 return; 0bd5ddedccca44 Dave Chinner 2015-02-23 599 1b0407125f9a5b Christoph Hellwig 2010-09-30 600 /* apply remaining deltas */ 0bd5ddedccca44 Dave Chinner 2015-02-23 601 spin_lock(&mp->m_sb_lock); dc3ffbb14060c9 Dave Chinner 2020-05-20 602 mp->m_sb.sb_frextents += rtxdelta; dc3ffbb14060c9 Dave Chinner 2020-05-20 603 mp->m_sb.sb_dblocks += tp->t_dblocks_delta; dc3ffbb14060c9 Dave Chinner 2020-05-20 604 mp->m_sb.sb_agcount += tp->t_agcount_delta; dc3ffbb14060c9 Dave Chinner 2020-05-20 605 mp->m_sb.sb_imax_pct += tp->t_imaxpct_delta; dc3ffbb14060c9 Dave Chinner 2020-05-20 606 mp->m_sb.sb_rextsize += tp->t_rextsize_delta; dc3ffbb14060c9 Dave Chinner 2020-05-20 607 mp->m_sb.sb_rbmblocks += tp->t_rbmblocks_delta; dc3ffbb14060c9 Dave Chinner 2020-05-20 608 mp->m_sb.sb_rblocks += tp->t_rblocks_delta; dc3ffbb14060c9 Dave Chinner 2020-05-20 609 mp->m_sb.sb_rextents += tp->t_rextents_delta; dc3ffbb14060c9 Dave Chinner 2020-05-20 610 mp->m_sb.sb_rextslog += tp->t_rextslog_delta; 0bd5ddedccca44 Dave Chinner 2015-02-23 611 spin_unlock(&mp->m_sb_lock); 1b0407125f9a5b Christoph Hellwig 2010-09-30 612 dc3ffbb14060c9 Dave Chinner 2020-05-20 613 /* dc3ffbb14060c9 Dave Chinner 2020-05-20 614 * Debug checks outside of the spinlock so they don't lock up the dc3ffbb14060c9 Dave Chinner 2020-05-20 615 * machine if they fail. dc3ffbb14060c9 Dave Chinner 2020-05-20 616 */ dc3ffbb14060c9 Dave Chinner 2020-05-20 617 ASSERT(mp->m_sb.sb_imax_pct >= 0); dc3ffbb14060c9 Dave Chinner 2020-05-20 618 ASSERT(mp->m_sb.sb_rextslog >= 0); 1b0407125f9a5b Christoph Hellwig 2010-09-30 619 return; ^1da177e4c3f41 Linus Torvalds 2005-04-16 620 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 621 :::::: The code at line 559 was first introduced by commit :::::: 0bd5ddedccca4451ac2390d1155b4ab74b990eff xfs: replace xfs_mod_incore_sb_batched :::::: TO: Dave Chinner <dchinner(a)redhat.com&gt; :::::: CC: Dave Chinner <david(a)fromorbit.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org