[kbuild-all] [djwong-xfs:vectorized-scrub 196/308] fs/xfs/libxfs/xfs_alloc.c:2564:3: warning: Value stored to 'agno' is never read [clang-analyzer-deadcode.DeadStores]

tree: https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux.git vectorized-scrub head: d404c6b945070ba14d8db1ee79daa5df149877df commit: 13631516b02090441a5c788ae69b076009c44418 [196/308] xfs: support logging EFIs for realtime extents config: arm-randconfig-c002-20211017 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 746dd6a700931988dd9021d3d04718f1929885a5) 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 # install arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi # https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux.git/comm... 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 13631516b02090441a5c788ae69b076009c44418 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm clang-analyzer If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; clang-analyzer warnings: (new ones prefixed by >>) agno = 0; ^ ~ agbno = bno; ^ ~~~ vim +/agno +2564 fs/xfs/libxfs/xfs_alloc.c f8f2835a9cf300 Brian Foster 2018-05-07 2540 0c34a6f15b5c3a Darrick J. Wong 2021-09-01 2541 /* 0c34a6f15b5c3a Darrick J. Wong 2021-09-01 2542 * Add the extent to the list of extents to be free at transaction end. 0c34a6f15b5c3a Darrick J. Wong 2021-09-01 2543 * The list is maintained sorted (by block number). 0c34a6f15b5c3a Darrick J. Wong 2021-09-01 2544 */ 0c34a6f15b5c3a Darrick J. Wong 2021-09-01 2545 void 0c34a6f15b5c3a Darrick J. Wong 2021-09-01 2546 xfs_free_extent_later( 0c34a6f15b5c3a Darrick J. Wong 2021-09-01 2547 struct xfs_trans *tp, 0c34a6f15b5c3a Darrick J. Wong 2021-09-01 2548 xfs_fsblock_t bno, 0c34a6f15b5c3a Darrick J. Wong 2021-09-01 2549 xfs_filblks_t len, 0c34a6f15b5c3a Darrick J. Wong 2021-09-01 2550 const struct xfs_owner_info *oinfo, 30bb91bc0f3b93 Darrick J. Wong 2021-09-01 2551 unsigned int flags) 0c34a6f15b5c3a Darrick J. Wong 2021-09-01 2552 { 0c34a6f15b5c3a Darrick J. Wong 2021-09-01 2553 struct xfs_extent_free_item *new; /* new element */ 0c34a6f15b5c3a Darrick J. Wong 2021-09-01 2554 #ifdef DEBUG 0c34a6f15b5c3a Darrick J. Wong 2021-09-01 2555 struct xfs_mount *mp = tp->t_mountp; 0c34a6f15b5c3a Darrick J. Wong 2021-09-01 2556 xfs_agnumber_t agno; 0c34a6f15b5c3a Darrick J. Wong 2021-09-01 2557 xfs_agblock_t agbno; 0c34a6f15b5c3a Darrick J. Wong 2021-09-01 2558 0c34a6f15b5c3a Darrick J. Wong 2021-09-01 2559 ASSERT(bno != NULLFSBLOCK); 0c34a6f15b5c3a Darrick J. Wong 2021-09-01 2560 ASSERT(len > 0); 0c34a6f15b5c3a Darrick J. Wong 2021-09-01 2561 ASSERT(len <= MAXEXTLEN); 0c34a6f15b5c3a Darrick J. Wong 2021-09-01 2562 ASSERT(!isnullstartblock(bno)); 13631516b02090 Darrick J. Wong 2021-09-01 2563 if (flags & XFS_FREE_EXTENT_REALTIME) { 13631516b02090 Darrick J. Wong 2021-09-01 @2564 agno = 0; 13631516b02090 Darrick J. Wong 2021-09-01 @2565 agbno = bno; 13631516b02090 Darrick J. Wong 2021-09-01 2566 ASSERT(bno < mp->m_sb.sb_rblocks); 13631516b02090 Darrick J. Wong 2021-09-01 2567 ASSERT(len <= mp->m_sb.sb_rblocks); 13631516b02090 Darrick J. Wong 2021-09-01 2568 ASSERT(bno + len <= mp->m_sb.sb_rblocks); 13631516b02090 Darrick J. Wong 2021-09-01 2569 } else { 0c34a6f15b5c3a Darrick J. Wong 2021-09-01 2570 agno = XFS_FSB_TO_AGNO(mp, bno); 0c34a6f15b5c3a Darrick J. Wong 2021-09-01 2571 agbno = XFS_FSB_TO_AGBNO(mp, bno); 0c34a6f15b5c3a Darrick J. Wong 2021-09-01 2572 ASSERT(agno < mp->m_sb.sb_agcount); 0c34a6f15b5c3a Darrick J. Wong 2021-09-01 2573 ASSERT(agbno < mp->m_sb.sb_agblocks); 0c34a6f15b5c3a Darrick J. Wong 2021-09-01 2574 ASSERT(len < mp->m_sb.sb_agblocks); 0c34a6f15b5c3a Darrick J. Wong 2021-09-01 2575 ASSERT(agbno + len <= mp->m_sb.sb_agblocks); 13631516b02090 Darrick J. Wong 2021-09-01 2576 } 30bb91bc0f3b93 Darrick J. Wong 2021-09-01 2577 ASSERT(!(flags & ~XFS_FREE_EXTENT_ALL_FLAGS)); 0c34a6f15b5c3a Darrick J. Wong 2021-09-01 2578 #endif 0c34a6f15b5c3a Darrick J. Wong 2021-09-01 2579 ASSERT(xfs_extent_free_item_zone != NULL); 0c34a6f15b5c3a Darrick J. Wong 2021-09-01 2580 0c34a6f15b5c3a Darrick J. Wong 2021-09-01 2581 new = kmem_cache_alloc(xfs_extent_free_item_zone, 0c34a6f15b5c3a Darrick J. Wong 2021-09-01 2582 GFP_KERNEL | __GFP_NOFAIL); 0c34a6f15b5c3a Darrick J. Wong 2021-09-01 2583 new->xefi_startblock = bno; 0c34a6f15b5c3a Darrick J. Wong 2021-09-01 2584 new->xefi_blockcount = (xfs_extlen_t)len; 0c34a6f15b5c3a Darrick J. Wong 2021-09-01 2585 if (oinfo) 0c34a6f15b5c3a Darrick J. Wong 2021-09-01 2586 new->xefi_oinfo = *oinfo; 0c34a6f15b5c3a Darrick J. Wong 2021-09-01 2587 else 0c34a6f15b5c3a Darrick J. Wong 2021-09-01 2588 new->xefi_oinfo = XFS_RMAP_OINFO_SKIP_UPDATE; 30bb91bc0f3b93 Darrick J. Wong 2021-09-01 2589 new->xefi_skip_discard = !!(flags & XFS_FREE_EXTENT_SKIP_DISCARD); 13631516b02090 Darrick J. Wong 2021-09-01 2590 new->xefi_realtime = !!(flags & XFS_FREE_EXTENT_REALTIME); 5262e94653712f Darrick J. Wong 2021-09-01 2591 5262e94653712f Darrick J. Wong 2021-09-01 2592 trace_xfs_extent_free_defer(tp->t_mountp, XFS_FREE_EXTENT_REGULAR, 5262e94653712f Darrick J. Wong 2021-09-01 2593 new); 0c34a6f15b5c3a Darrick J. Wong 2021-09-01 2594 xfs_defer_add(tp, XFS_DEFER_OPS_TYPE_FREE, &new->xefi_list); 0c34a6f15b5c3a Darrick J. Wong 2021-09-01 2595 } 0c34a6f15b5c3a Darrick J. Wong 2021-09-01 2596 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org