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14498ca7e0f18cd73ab0010cbfbf9413a9f0a96f
linux/fs
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Uros Bizjak 14498ca7e0 fs: Use try_cmpxchg() in start_dir_add() 
Use try_cmpxchg() instead of cmpxchg(*ptr, old, new) == old.

The x86 CMPXCHG instruction returns success in the ZF flag,
so this change saves a compare after CMPXCHG (and related
move instruction in front of CMPXCHG).

Note that the value from *ptr should be read using READ_ONCE() to
prevent the compiler from merging, refetching or reordering the read.

No functional change intended.

Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Link: https://lore.kernel.org/20250811125308.616717-1-ubizjak@gmail.com
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>
2025-08-25 14:09:00 +02:00
..
9p
Merge tag 'vfs-6.17-rc1.mmap_prepare' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-07-28 13:43:25 -07:00
adfs
Merge tag 'vfs-6.17-rc1.mmap_prepare' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-07-28 13:43:25 -07:00
affs
Merge tag 'vfs-6.17-rc1.mmap_prepare' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-07-28 13:43:25 -07:00
afs
Merge tag 'vfs-6.17-rc1.mmap_prepare' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-07-28 13:43:25 -07:00
autofs
new helper: set_default_d_op()
2025-06-10 22:21:16 -04:00
bcachefs
Merge tag 'vfs-6.17-rc1.fileattr' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-07-28 15:24:14 -07:00
befs
…
bfs
Merge tag 'vfs-6.17-rc1.mmap_prepare' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-07-28 13:43:25 -07:00
btrfs
Merge tag 'for-6.17-fix-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux
2025-08-06 15:52:56 +03:00
cachefiles
Merge tag 'vfs-6.17-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-07-28 11:22:56 -07:00
ceph
Merge tag 'mm-stable-2025-07-30-15-25' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2025-07-31 14:57:54 -07:00
coda
Merge tag 'vfs-6.17-rc1.mmap_prepare' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-07-28 13:43:25 -07:00
configfs
configfs: use DCACHE_DONTCACHE
2025-06-11 13:41:05 -04:00
cramfs
mm: remove callers of pfn_t functionality
2025-07-09 22:42:19 -07:00
crypto
fscrypt: Remove gfp_t argument from fscrypt_encrypt_block_inplace()
2025-07-10 12:33:13 -07:00
debugfs
debugfs: fix mount options not being applied
2025-08-19 13:11:29 +02:00
devpts
devpts, sunrpc, hostfs: don't bother with ->d_op
2025-06-11 13:40:04 -04:00
dlm
treewide, timers: Rename from_timer() to timer_container_of()
2025-06-08 09:07:37 +02:00
ecryptfs
Merge tag 'vfs-6.17-rc1.fileattr' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-07-28 15:24:14 -07:00
efivarfs
Merge tag 'vfs-6.17-rc1.fileattr' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-07-28 15:24:14 -07:00
efs
…
erofs
Merge tag 'vfs-6.17-rc1.mmap_prepare' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-07-28 13:43:25 -07:00
exfat
exfat: add cluster chain loop check for dir
2025-08-01 08:34:23 +09:00
exportfs
exportfs: use lookup_one_unlocked()
2025-06-11 13:44:15 +02:00
ext2
Merge tag 'fs_for_v6.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
2025-07-28 16:16:09 -07:00
ext4
Merge tag 'mm-stable-2025-07-30-15-25' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2025-07-31 14:57:54 -07:00
f2fs
Merge tag 'f2fs-for-6.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs
2025-08-04 16:27:21 -07:00
fat
Merge tag 'mm-nonmm-stable-2025-08-03-12-47' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2025-08-03 16:23:09 -07:00
freevxfs
…
fuse
Merge tag 'mm-stable-2025-07-30-15-25' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2025-07-31 14:57:54 -07:00
gfs2
Merge tag 'vfs-6.17-rc1.iomap' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-07-28 16:09:03 -07:00
hfs
Merge tag 'hfs-v6.17-tag1' of git://git.kernel.org/pub/scm/linux/kernel/git/vdubeyko/hfs
2025-07-28 16:17:44 -07:00
hfsplus
Merge tag 'hfs-v6.17-tag1' of git://git.kernel.org/pub/scm/linux/kernel/git/vdubeyko/hfs
2025-07-28 16:17:44 -07:00
hostfs
Merge tag 'vfs-6.17-rc1.mmap_prepare' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-07-28 13:43:25 -07:00
hpfs
Merge tag 'vfs-6.17-rc1.mmap_prepare' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-07-28 13:43:25 -07:00
hugetlbfs
Merge tag 'mm-stable-2025-07-30-15-25' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2025-07-31 14:57:54 -07:00
iomap
Merge tag 'vfs-6.17-rc1.iomap' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-07-28 16:09:03 -07:00
isofs
Merge tag 'pull-dcache' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2025-07-28 09:17:57 -07:00
jbd2
treewide, timers: Rename from_timer() to timer_container_of()
2025-06-08 09:07:37 +02:00
jffs2
Merge tag 'vfs-6.17-rc1.mmap_prepare' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-07-28 13:43:25 -07:00
jfs
Merge tag 'jfs-6.17' of github.com:kleikamp/linux-shaggy
2025-07-31 10:27:11 -07:00
kernfs
Merge tag 'bpf-next-6.17' of git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next
2025-07-30 09:58:50 -07:00
lockd
…
minix
minixfs: Verify inode mode when loading from disk
2025-08-19 13:30:46 +02:00
netfs
netfs: Fix race between cache write completion and ALL_QUEUED being set
2025-07-14 11:05:02 +02:00
nfs
Merge tag 'nfs-for-6.17-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs
2025-08-09 07:20:44 +03:00
nfs_common
NFS/localio: nfs_uuid_put() fix the wake up after unlinking the file
2025-08-05 16:45:40 -07:00
nfsd
Merge tag 'net-next-6.17' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next
2025-07-30 08:58:55 -07:00
nilfs2
Merge tag 'vfs-6.17-rc1.fileattr' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-07-28 15:24:14 -07:00
nls
…
notify
Merge tag 'fsnotify_for_v6.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
2025-07-31 10:31:00 -07:00
ntfs3
Merge tag 'vfs-6.17-rc1.mmap_prepare' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-07-28 13:43:25 -07:00
ocfs2
Merge tag 'mm-nonmm-stable-2025-08-03-12-47' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2025-08-03 16:23:09 -07:00
omfs
Merge tag 'vfs-6.17-rc1.mmap_prepare' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-07-28 13:43:25 -07:00
openpromfs
…
orangefs
Merge tag 'for-linus-6.17-ofs1' of git://git.kernel.org/pub/scm/linux/kernel/git/hubcap/linux
2025-07-31 10:22:48 -07:00
overlayfs
Merge tag 'vfs-6.17-rc1.fileattr' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-07-28 15:24:14 -07:00
proc
Merge tag 'mm-nonmm-stable-2025-08-03-12-47' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2025-08-03 16:23:09 -07:00
pstore
pstore: switch to locked_recursive_removal()
2025-07-02 22:36:51 -04:00
qnx4
…
qnx6
…
quota
VFS: rename lookup_one_len family to lookup_noperm and remove permission check
2025-04-08 11:24:36 +02:00
ramfs
Merge tag 'vfs-6.17-rc1.mmap_prepare' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-07-28 13:43:25 -07:00
resctrl
resctrl: get rid of pointless debugfs_file_{get,put}()
2025-07-09 13:30:28 +02:00
romfs
fs: replace mmap hook with .mmap_prepare for simple mappings
2025-06-19 13:56:59 +02:00
smb
Merge tag 'v6.17rc-part2-SMB3-client-fixes' of git://git.samba.org/sfrench/cifs-2.6
2025-08-09 07:12:43 +03:00
squashfs
squashfs: fix incorrect argument to sizeof in kmalloc_array call
2025-07-19 19:08:27 -07:00
sysfs
sysfs: constify internal references to 'struct bin_attribute'
2025-06-17 10:44:09 +02:00
tests
…
tracefs
Merge tag 'pull-rpc_pipefs' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2025-07-28 09:56:09 -07:00
ubifs
Merge tag 'ubifs-for-linus-6.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/ubifs
2025-07-31 10:08:44 -07:00
udf
Merge tag 'fs_for_v6.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
2025-07-28 16:16:09 -07:00
ufs
Merge tag 'vfs-6.17-rc1.mmap_prepare' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-07-28 13:43:25 -07:00
unicode
…
vboxsf
Merge tag 'vfs-6.17-rc1.mmap_prepare' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-07-28 13:43:25 -07:00
verity
fsverity: Switch from crypto_shash to SHA-2 library
2025-07-14 11:29:32 -07:00
xfs
Merge tag 'mm-stable-2025-07-30-15-25' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2025-07-31 14:57:54 -07:00
zonefs
Merge tag 'zonefs-6.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/dlemoal/zonefs
2025-07-28 17:06:51 -07:00
aio.c
fs: replace mmap hook with .mmap_prepare for simple mappings
2025-06-19 13:56:59 +02:00
anon_inodes.c
fs: export anon_inode_make_secure_inode() and fix secretmem LSM bypass
2025-06-23 12:41:17 +02:00
attr.c
docs/vfs: update references to i_mutex to i_rwsem
2025-06-23 12:17:33 +02:00
backing-file.c
Merge tag 'vfs-6.17-rc1.mmap_prepare' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-07-28 13:43:25 -07:00
bad_inode.c
…
binfmt_elf_fdpic.c
Merge tag 'execve-v6.17' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux
2025-07-28 17:11:40 -07:00
binfmt_elf.c
Merge tag 'execve-v6.17' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux
2025-07-28 17:11:40 -07:00
binfmt_flat.c
…
binfmt_misc.c
binfmt_misc: switch to locked_recursive_removal()
2025-07-02 22:36:51 -04:00
binfmt_script.c
…
bpf_fs_kfuncs.c
bpf: Introduce bpf_cgroup_read_xattr to read xattr of cgroup's node
2025-07-02 14:18:20 +02:00
buffer.c
fs: change write_begin/write_end interface to take struct kiocb *
2025-07-16 14:48:18 +02:00
char_dev.c
…
compat_binfmt_elf.c
…
coredump.c
Merge tag 'vfs-6.17-rc1.pidfs' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-07-28 14:10:15 -07:00
d_path.c
fold fs_struct->{lock,seq} into a seqlock
2025-07-08 10:25:19 +02:00
dax.c
mm: remove callers of pfn_t functionality
2025-07-09 22:42:19 -07:00
dcache.c
fs: Use try_cmpxchg() in start_dir_add()
2025-08-25 14:09:00 +02:00
direct-io.c
Merge tag 'mm-stable-2025-07-30-15-25' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2025-07-31 14:57:54 -07:00
drop_caches.c
…
eventfd.c
…
eventpoll.c
Merge tag 'vfs-6.17-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-07-28 11:22:56 -07:00
exec.c
Merge tag 'mm-stable-2025-07-30-15-25' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2025-07-31 14:57:54 -07:00
fcntl.c
…
fhandle.c
fold fs_struct->{lock,seq} into a seqlock
2025-07-08 10:25:19 +02:00
file_attr.c
fs: tighten a sanity check in file_attr_to_fileattr()
2025-07-16 10:22:01 +02:00
file_table.c
Merge tag 'fsnotify_for_v6.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
2025-07-31 10:31:00 -07:00
file.c
fs: always return zero on success from replace_fd()
2025-08-11 14:52:25 +02:00
filesystems.c
fs/filesystems: Fix potential unsigned integer underflow in fs_name()
2025-04-14 13:05:59 +02:00
fs_context.c
fs/fs_context: Mark an unlikely if condition with unlikely() in vfs_parse_monolithic_sep()
2025-04-14 13:05:59 +02:00
fs_parser.c
fs/fs_parse: Remove unused and problematic validate_constant_table()
2025-04-21 10:27:59 +02:00
fs_pin.c
…
fs_struct.c
fold fs_struct->{lock,seq} into a seqlock
2025-07-08 10:25:19 +02:00
fs_types.c
…
fs-writeback.c
fs-writeback: Remove redundant __GFP_NOWARN
2025-08-15 16:06:32 +02:00
fsopen.c
…
init.c
…
inode.c
vfs: show filesystem name at dump_inode()
2025-08-11 15:50:48 +02:00
internal.h
Merge tag 'vfs-6.17-rc1.pidfs' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-07-28 14:10:15 -07:00
ioctl.c
fs: split fileattr related helpers into separate file
2025-07-01 22:44:22 +02:00
Kconfig
fs/Kconfig: enable HUGETLBFS only if ARCH_SUPPORTS_HUGETLBFS
2025-07-24 19:12:38 -07:00
Kconfig.binfmt
…
kernel_read_file.c
…
libfs.c
Merge tag 'vfs-6.17-rc1.pidfs' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-07-28 14:10:15 -07:00
locks.c
locks: Remove the last reference to EXPORT_OP_ASYNC_LOCK.
2025-08-11 14:52:24 +02:00
Makefile
fs: split fileattr related helpers into separate file
2025-07-01 22:44:22 +02:00
mbcache.c
…
mnt_idmapping.c
…
mount.h
copy_tree(): don't link the mounts via mnt_list
2025-06-29 19:03:37 -04:00
mpage.c
fs: use writeback_iter directly in mpage_writepages
2025-05-09 12:37:48 +02:00
namei.c
fs: fix "writen"->"written"
2025-08-11 14:52:25 +02:00
namespace.c
fs: Add 'initramfs_options' to set initramfs mount options
2025-08-21 10:23:48 +02:00
nsfs.c
Merge tag 'vfs-6.15-rc1.nsfs' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-03-24 11:38:12 -07:00
open.c
Merge tag 'fsnotify_for_v6.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
2025-07-31 10:31:00 -07:00
pidfs.c
Merge tag 'vfs-6.17-rc1.pidfs' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-07-28 14:10:15 -07:00
pipe.c
fs/pipe: set FMODE_NOWAIT in create_pipe_files()
2025-06-10 13:16:19 +02:00
pnode.c
copy_tree(): don't link the mounts via mnt_list
2025-06-29 19:03:37 -04:00
pnode.h
get rid of CL_SHARE_TO_SLAVE
2025-06-29 19:03:46 -04:00
posix_acl.c
…
proc_namespace.c
->mnt_devname is never NULL
2025-05-23 14:20:44 +02:00
read_write.c
copy_file_range: limit size if in compat mode
2025-08-15 16:11:47 +02:00
readdir.c
readdir: supply dir_context.count as readdir buffer size hint
2025-05-29 12:31:23 +02:00
remap_range.c
…
select.c
fs: annotate suspected data race between poll_schedule_timeout() and pollwake()
2025-06-23 12:36:51 +02:00
seq_file.c
…
signalfd.c
…
splice.c
splice: remove duplicate noinline from pipe_clear_nowait
2025-04-25 12:11:56 +02:00
stack.c
docs/vfs: update references to i_mutex to i_rwsem
2025-06-23 12:17:33 +02:00
stat.c
Merge tag 'xfs-merge-6.16' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux
2025-05-26 12:56:01 -07:00
statfs.c
…
super.c
Merge tag 'vfs-6.17-rc1.super' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-07-28 15:50:15 -07:00
sync.c
…
sysctls.c
…
timerfd.c
Merge tag 'timers-cleanups-2025-03-23' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2025-03-25 10:54:15 -07:00
userfaultfd.c
mm/mremap: use an explicit uffd failure path for mremap
2025-07-24 19:12:29 -07:00
utimes.c
…
xattr.c
Merge tag 'vfs-6.17-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-07-28 11:22:56 -07:00