Replace the existing /* fall through */ comments and its variants with
the new pseudo-keyword macro fallthrough[1]. Also, remove unnecessary
fall-through markings when it is the case.

[1] 
https://www.kernel.org/doc/html/latest/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through

Signed-off-by: Gustavo A. R. Silva <[email protected]>
---
 fs/xfs/libxfs/xfs_ag_resv.c   |    4 ++--
 fs/xfs/libxfs/xfs_alloc.c     |    2 +-
 fs/xfs/libxfs/xfs_da_btree.c  |    2 +-
 fs/xfs/libxfs/xfs_inode_buf.c |    4 ++--
 fs/xfs/scrub/bmap.c           |    2 +-
 fs/xfs/scrub/btree.c          |    2 +-
 fs/xfs/scrub/common.c         |    6 +++---
 fs/xfs/scrub/dabtree.c        |    2 +-
 fs/xfs/scrub/repair.c         |    2 +-
 fs/xfs/xfs_bmap_util.c        |    2 +-
 fs/xfs/xfs_export.c           |    4 ++--
 fs/xfs/xfs_file.c             |    2 +-
 fs/xfs/xfs_fsmap.c            |    2 +-
 fs/xfs/xfs_inode.c            |    2 +-
 fs/xfs/xfs_ioctl.c            |    4 ++--
 fs/xfs/xfs_iomap.c            |    2 +-
 fs/xfs/xfs_trans_buf.c        |    2 +-
 17 files changed, 23 insertions(+), 23 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_ag_resv.c b/fs/xfs/libxfs/xfs_ag_resv.c
index fdfe6dc0d307..0b061a027e4e 100644
--- a/fs/xfs/libxfs/xfs_ag_resv.c
+++ b/fs/xfs/libxfs/xfs_ag_resv.c
@@ -338,7 +338,7 @@ xfs_ag_resv_alloc_extent(
                break;
        default:
                ASSERT(0);
-               /* fall through */
+               fallthrough;
        case XFS_AG_RESV_NONE:
                field = args->wasdel ? XFS_TRANS_SB_RES_FDBLOCKS :
                                       XFS_TRANS_SB_FDBLOCKS;
@@ -380,7 +380,7 @@ xfs_ag_resv_free_extent(
                break;
        default:
                ASSERT(0);
-               /* fall through */
+               fallthrough;
        case XFS_AG_RESV_NONE:
                xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, (int64_t)len);
                return;
diff --git a/fs/xfs/libxfs/xfs_alloc.c b/fs/xfs/libxfs/xfs_alloc.c
index 203e74fa64aa..6b153e6ee342 100644
--- a/fs/xfs/libxfs/xfs_alloc.c
+++ b/fs/xfs/libxfs/xfs_alloc.c
@@ -3119,7 +3119,7 @@ xfs_alloc_vextent(
                }
                args->agbno = XFS_FSB_TO_AGBNO(mp, args->fsbno);
                args->type = XFS_ALLOCTYPE_NEAR_BNO;
-               /* FALLTHROUGH */
+               fallthrough;
        case XFS_ALLOCTYPE_FIRST_AG:
                /*
                 * Rotate through the allocation groups looking for a winner.
diff --git a/fs/xfs/libxfs/xfs_da_btree.c b/fs/xfs/libxfs/xfs_da_btree.c
index 897749c41f36..c48beec0c0df 100644
--- a/fs/xfs/libxfs/xfs_da_btree.c
+++ b/fs/xfs/libxfs/xfs_da_btree.c
@@ -276,7 +276,7 @@ xfs_da3_node_read_verify(
                                                __this_address);
                                break;
                        }
-                       /* fall through */
+                       fallthrough;
                case XFS_DA_NODE_MAGIC:
                        fa = xfs_da3_node_verify(bp);
                        if (fa)
diff --git a/fs/xfs/libxfs/xfs_inode_buf.c b/fs/xfs/libxfs/xfs_inode_buf.c
index 6f84ea85fdd8..63b0d86ff985 100644
--- a/fs/xfs/libxfs/xfs_inode_buf.c
+++ b/fs/xfs/libxfs/xfs_inode_buf.c
@@ -439,8 +439,8 @@ xfs_dinode_verify_forkoff(
                if (dip->di_forkoff != (roundup(sizeof(xfs_dev_t), 8) >> 3))
                        return __this_address;
                break;
-       case XFS_DINODE_FMT_LOCAL:      /* fall through ... */
-       case XFS_DINODE_FMT_EXTENTS:    /* fall through ... */
+       case XFS_DINODE_FMT_LOCAL:
+       case XFS_DINODE_FMT_EXTENTS:
        case XFS_DINODE_FMT_BTREE:
                if (dip->di_forkoff >= (XFS_LITINO(mp) >> 3))
                        return __this_address;
diff --git a/fs/xfs/scrub/bmap.c b/fs/xfs/scrub/bmap.c
index 7badd6dfe544..10e8599b34f6 100644
--- a/fs/xfs/scrub/bmap.c
+++ b/fs/xfs/scrub/bmap.c
@@ -252,7 +252,7 @@ xchk_bmap_iextent_xref(
        case XFS_DATA_FORK:
                if (xfs_is_reflink_inode(info->sc->ip))
                        break;
-               /* fall through */
+               fallthrough;
        case XFS_ATTR_FORK:
                xchk_xref_is_not_shared(info->sc, agbno,
                                irec->br_blockcount);
diff --git a/fs/xfs/scrub/btree.c b/fs/xfs/scrub/btree.c
index f52a7b8256f9..990a379fc322 100644
--- a/fs/xfs/scrub/btree.c
+++ b/fs/xfs/scrub/btree.c
@@ -43,7 +43,7 @@ __xchk_btree_process_error(
                /* Note the badness but don't abort. */
                sc->sm->sm_flags |= errflag;
                *error = 0;
-               /* fall through */
+               fallthrough;
        default:
                if (cur->bc_flags & XFS_BTREE_ROOT_IN_INODE)
                        trace_xchk_ifork_btree_op_error(sc, cur, level,
diff --git a/fs/xfs/scrub/common.c b/fs/xfs/scrub/common.c
index 18876056e5e0..63f13c8ed8c7 100644
--- a/fs/xfs/scrub/common.c
+++ b/fs/xfs/scrub/common.c
@@ -81,7 +81,7 @@ __xchk_process_error(
                /* Note the badness but don't abort. */
                sc->sm->sm_flags |= errflag;
                *error = 0;
-               /* fall through */
+               fallthrough;
        default:
                trace_xchk_op_error(sc, agno, bno, *error,
                                ret_ip);
@@ -134,7 +134,7 @@ __xchk_fblock_process_error(
                /* Note the badness but don't abort. */
                sc->sm->sm_flags |= errflag;
                *error = 0;
-               /* fall through */
+               fallthrough;
        default:
                trace_xchk_file_op_error(sc, whichfork, offset, *error,
                                ret_ip);
@@ -713,7 +713,7 @@ xchk_get_inode(
                if (error)
                        return -ENOENT;
                error = -EFSCORRUPTED;
-               /* fall through */
+               fallthrough;
        default:
                trace_xchk_op_error(sc,
                                XFS_INO_TO_AGNO(mp, sc->sm->sm_ino),
diff --git a/fs/xfs/scrub/dabtree.c b/fs/xfs/scrub/dabtree.c
index 44b15015021f..238a0cab792c 100644
--- a/fs/xfs/scrub/dabtree.c
+++ b/fs/xfs/scrub/dabtree.c
@@ -47,7 +47,7 @@ xchk_da_process_error(
                /* Note the badness but don't abort. */
                sc->sm->sm_flags |= XFS_SCRUB_OFLAG_CORRUPT;
                *error = 0;
-               /* fall through */
+               fallthrough;
        default:
                trace_xchk_file_op_error(sc, ds->dargs.whichfork,
                                xfs_dir2_da_to_db(ds->dargs.geo,
diff --git a/fs/xfs/scrub/repair.c b/fs/xfs/scrub/repair.c
index db3cfd12803d..90948ca758a7 100644
--- a/fs/xfs/scrub/repair.c
+++ b/fs/xfs/scrub/repair.c
@@ -944,7 +944,7 @@ xrep_ino_dqattach(
                        xrep_force_quotacheck(sc, XFS_DQ_GROUP);
                if (XFS_IS_PQUOTA_ON(sc->mp) && !sc->ip->i_pdquot)
                        xrep_force_quotacheck(sc, XFS_DQ_PROJ);
-               /* fall through */
+               fallthrough;
        case -ESRCH:
                error = 0;
                break;
diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c
index f37f5cc4b19f..035896e81104 100644
--- a/fs/xfs/xfs_bmap_util.c
+++ b/fs/xfs/xfs_bmap_util.c
@@ -244,7 +244,7 @@ xfs_bmap_count_blocks(
                 */
                *count += btblocks - 1;
 
-               /* fall through */
+               fallthrough;
        case XFS_DINODE_FMT_EXTENTS:
                *nextents = xfs_bmap_count_leaves(ifp, count);
                break;
diff --git a/fs/xfs/xfs_export.c b/fs/xfs/xfs_export.c
index 5a4b0119143a..bc5fcb631c51 100644
--- a/fs/xfs/xfs_export.c
+++ b/fs/xfs/xfs_export.c
@@ -84,7 +84,7 @@ xfs_fs_encode_fh(
        case FILEID_INO32_GEN_PARENT:
                fid->i32.parent_ino = XFS_I(parent)->i_ino;
                fid->i32.parent_gen = parent->i_generation;
-               /*FALLTHRU*/
+               fallthrough;
        case FILEID_INO32_GEN:
                fid->i32.ino = XFS_I(inode)->i_ino;
                fid->i32.gen = inode->i_generation;
@@ -92,7 +92,7 @@ xfs_fs_encode_fh(
        case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG:
                fid64->parent_ino = XFS_I(parent)->i_ino;
                fid64->parent_gen = parent->i_generation;
-               /*FALLTHRU*/
+               fallthrough;
        case FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG:
                fid64->ino = XFS_I(inode)->i_ino;
                fid64->gen = inode->i_generation;
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 00db81eac80d..b85d1da85b82 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -769,7 +769,7 @@ xfs_break_layouts(
                        error = xfs_break_dax_layouts(inode, &retry);
                        if (error || retry)
                                break;
-                       /* fall through */
+                       fallthrough;
                case BREAK_WRITE:
                        error = xfs_break_leased_layouts(inode, iolock, &retry);
                        break;
diff --git a/fs/xfs/xfs_fsmap.c b/fs/xfs/xfs_fsmap.c
index 4eebcec4aae6..c334550aeea7 100644
--- a/fs/xfs/xfs_fsmap.c
+++ b/fs/xfs/xfs_fsmap.c
@@ -100,7 +100,7 @@ xfs_fsmap_owner_to_rmap(
                dest->rm_owner = XFS_RMAP_OWN_COW;
                break;
        case XFS_FMR_OWN_DEFECTIVE:     /* not implemented */
-               /* fall through */
+               fallthrough;
        default:
                return -EINVAL;
        }
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index 9aea7d68d8ab..52ce37ed14de 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -906,7 +906,7 @@ xfs_ialloc(
                        if (pip->i_d.di_flags2 & XFS_DIFLAG2_DAX)
                                ip->i_d.di_flags2 |= XFS_DIFLAG2_DAX;
                }
-               /* FALLTHROUGH */
+               fallthrough;
        case S_IFLNK:
                ip->i_df.if_format = XFS_DINODE_FMT_EXTENTS;
                ip->i_df.if_flags = XFS_IFEXTENTS;
diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index a190212ca85d..ea366a645c8e 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -557,7 +557,7 @@ xfs_ioc_attrmulti_one(
        case ATTR_OP_REMOVE:
                value = NULL;
                *len = 0;
-               /* fall through */
+               fallthrough;
        case ATTR_OP_SET:
                error = mnt_want_write_file(parfilp);
                if (error)
@@ -1660,7 +1660,7 @@ xfs_ioc_getbmap(
        switch (cmd) {
        case XFS_IOC_GETBMAPA:
                bmx.bmv_iflags = BMV_IF_ATTRFORK;
-               /*FALLTHRU*/
+               fallthrough;
        case XFS_IOC_GETBMAP:
                if (file->f_mode & FMODE_NOCMTIME)
                        bmx.bmv_iflags |= BMV_IF_NO_DMAPI_READ;
diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
index b9a8c3798e08..fc4b65b24fdf 100644
--- a/fs/xfs/xfs_iomap.c
+++ b/fs/xfs/xfs_iomap.c
@@ -1002,7 +1002,7 @@ xfs_buffered_write_iomap_begin(
                        prealloc_blocks = 0;
                        goto retry;
                }
-               /*FALLTHRU*/
+               fallthrough;
        default:
                goto out_unlock;
        }
diff --git a/fs/xfs/xfs_trans_buf.c b/fs/xfs/xfs_trans_buf.c
index 08174ffa2118..ad79065607cc 100644
--- a/fs/xfs/xfs_trans_buf.c
+++ b/fs/xfs/xfs_trans_buf.c
@@ -310,7 +310,7 @@ xfs_trans_read_buf_map(
        default:
                if (tp && (tp->t_flags & XFS_TRANS_DIRTY))
                        xfs_force_shutdown(tp->t_mountp, 
SHUTDOWN_META_IO_ERROR);
-               /* fall through */
+               fallthrough;
        case -ENOMEM:
        case -EAGAIN:
                return error;

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