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23e490336467fcdaf95e1efcf8f58067b59f647b
linux/fs
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Mateusz Guzik 23e4903364 fs: predict no error in close() 
Vast majority of the time the system call returns 0.

Letting the compiler know shortens the routine (119 -> 116) and the fast
path.

Disasm starting at the call to __fput_sync():

before:
<+55>:    call   0xffffffff816b0da0 <__fput_sync>
<+60>:    lea    0x201(%rbx),%eax
<+66>:    cmp    $0x1,%eax
<+69>:    jbe    0xffffffff816ab707 <__x64_sys_close+103>
<+71>:    mov    %ebx,%edx
<+73>:    movslq %ebx,%rax
<+76>:    and    $0xfffffffd,%edx
<+79>:    cmp    $0xfffffdfc,%edx
<+85>:    mov    $0xfffffffffffffffc,%rdx
<+92>:    cmove  %rdx,%rax
<+96>:    pop    %rbx
<+97>:    pop    %rbp
<+98>:    jmp    0xffffffff82242fa0 <__x86_return_thunk>
<+103>:   mov    $0xfffffffffffffffc,%rax
<+110>:   jmp    0xffffffff816ab700 <__x64_sys_close+96>
<+112>:   mov    $0xfffffffffffffff7,%rax
<+119>:   jmp    0xffffffff816ab700 <__x64_sys_close+96>

after:
<+56>:    call   0xffffffff816b0da0 <__fput_sync>
<+61>:    xor    %eax,%eax
<+63>:    test   %ebp,%ebp
<+65>:    jne    0xffffffff816ab6ea <__x64_sys_close+74>
<+67>:    pop    %rbx
<+68>:    pop    %rbp
<+69>:    jmp    0xffffffff82242fa0 <__x86_return_thunk> # the jmp out
<+74>:    lea    0x201(%rbp),%edx
<+80>:    mov    $0xfffffffffffffffc,%rax
<+87>:    cmp    $0x1,%edx
<+90>:    jbe    0xffffffff816ab6e3 <__x64_sys_close+67>
<+92>:    mov    %ebp,%edx
<+94>:    and    $0xfffffffd,%edx
<+97>:    cmp    $0xfffffdfc,%edx
<+103>:   cmovne %rbp,%rax
<+107>:   jmp    0xffffffff816ab6e3 <__x64_sys_close+67>
<+109>:   mov    $0xfffffffffffffff7,%rax
<+116>:   jmp    0xffffffff816ab6e3 <__x64_sys_close+67>

Signed-off-by: Mateusz Guzik <mjguzik@gmail.com>
Link: https://lore.kernel.org/r/20250301104356.246031-1-mjguzik@gmail.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
2025-03-05 18:25:36 +01:00
..
9p
Merge tag 'pull-revalidate' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2025-01-30 09:13:35 -08:00
adfs
Merge patch series "adfs, affs, befs, hfs, hfsplus: convert to new mount api"
2024-10-08 14:41:53 +02:00
affs
Merge patch series "adfs, affs, befs, hfs, hfsplus: convert to new mount api"
2024-10-08 14:41:53 +02:00
afs
Merge tag 'pull-revalidate' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2025-01-30 09:13:35 -08:00
autofs
autofs: fix thinko in validate_dev_ioctl()
2024-10-28 13:16:56 +01:00
bcachefs
Merge tag 'pull-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2025-02-01 15:07:56 -08:00
befs
befs: convert befs to use the new mount api
2024-09-18 11:44:43 +02:00
bfs
fs: Convert aops->write_begin to take a folio
2024-08-07 11:33:21 +02:00
btrfs
Merge tag 'mm-stable-2025-01-26-14-59' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2025-01-26 18:36:23 -08:00
cachefiles
treewide: const qualify ctl_tables where applicable
2025-01-28 13:48:37 +01:00
ceph
Merge tag 'ceph-for-6.14-rc1' of https://github.com/ceph/ceph-client
2025-01-31 10:30:34 -08:00
coda
Merge tag 'pull-revalidate' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2025-01-30 09:13:35 -08:00
configfs
configfs: improve item creation performance
2024-11-14 07:45:20 +01:00
cramfs
Merge tag 'vfs-6.11.module.description' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2024-07-15 11:14:59 -07:00
crypto
fscrypt_d_revalidate(): use stable parent inode passed by caller
2025-01-27 19:25:23 -05:00
debugfs
debugfs: Fix the missing initializations in __debugfs_file_get()
2025-01-30 08:22:31 +01:00
devpts
treewide: const qualify ctl_tables where applicable
2025-01-28 13:48:37 +01:00
dlm
dlm: return -ENOENT if no comm was found
2024-12-19 13:11:24 -06:00
ecryptfs
Pass parent directory inode and expected name to ->d_revalidate()
2025-01-27 19:25:23 -05:00
efivarfs
efivarfs: add variable resync after hibernation
2025-01-22 13:28:17 +01:00
efs
efs: fix the efs new mount api implementation
2024-10-15 15:58:36 +02:00
erofs
Merge tag 'pull-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2025-02-01 15:07:56 -08:00
exfat
Merge tag 'pull-revalidate' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2025-01-30 09:13:35 -08:00
exportfs
fs: prepare for "explicit connectable" file handles
2024-11-15 11:34:57 +01:00
ext2
Merge tag 'vfs-6.12.file' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2024-09-16 09:14:02 +02:00
ext4
Merge tag 'pull-revalidate' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2025-01-30 09:13:35 -08:00
f2fs
Merge tag 'f2fs-for-6.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs
2025-01-27 20:58:58 -08:00
fat
vfat_revalidate{,_ci}(): use stable parent inode passed by caller
2025-01-27 19:25:24 -05:00
freevxfs
freevxfs: Replace one-element array with flexible array member
2024-11-06 10:42:06 +01:00
fuse
Merge tag 'pull-revalidate' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2025-01-30 09:13:35 -08:00
gfs2
Merge tag 'pull-revalidate' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2025-01-30 09:13:35 -08:00
hfs
Merge tag 'pull-revalidate' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2025-01-30 09:13:35 -08:00
hfsplus
Merge tag 'vfs-6.13.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2024-11-18 09:35:30 -08:00
hostfs
Merge tag 'pull-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2025-01-31 09:33:54 -08:00
hpfs
hpfs: convert hpfs to use the new mount api
2024-10-08 14:41:53 +02:00
hugetlbfs
mm/hugetlb: rename avoid_reserve to cow_from_owner
2025-01-25 20:22:30 -08:00
iomap
Merge tag 'mm-stable-2025-01-26-14-59' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2025-01-26 18:36:23 -08:00
isofs
isofs: Partially convert zisofs_read_folio to use a folio
2024-12-05 13:52:37 +01:00
jbd2
Merge tag 'crc-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiggers/linux
2025-01-22 19:55:08 -08:00
jffs2
jffs2: Fix rtime decompressor
2024-12-05 12:31:40 +01:00
jfs
Pass parent directory inode and expected name to ->d_revalidate()
2025-01-27 19:25:23 -05:00
kernfs
Merge tag 'pull-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2025-02-01 15:07:56 -08:00
lockd
treewide: const qualify ctl_tables where applicable
2025-01-28 13:48:37 +01:00
minix
buffer: Convert __block_write_begin() to take a folio
2024-08-07 11:33:36 +02:00
netfs
Merge tag 'vfs-6.14-rc1.netfs' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-01-20 09:29:11 -08:00
nfs
Merge tag 'pull-revalidate' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2025-01-30 09:13:35 -08:00
nfs_common
nfs: fix incorrect error handling in LOCALIO
2025-01-21 11:34:43 -05:00
nfsd
Merge tag 'nfs-for-6.14-1' of git://git.linux-nfs.org/projects/anna/linux-nfs
2025-01-28 14:23:46 -08:00
nilfs2
nilfs2: fix possible int overflows in nilfs_fiemap()
2025-02-01 03:53:26 -08:00
nls
move asm/unaligned.h to linux/unaligned.h
2024-10-02 17:23:23 -04:00
notify
treewide: const qualify ctl_tables where applicable
2025-01-28 13:48:37 +01:00
ntfs3
fs/ntfs3: Unify inode corruption marking with _ntfs_bad_inode()
2024-12-30 11:37:40 +03:00
ocfs2
ocfs2: fix incorrect CPU endianness conversion causing mount failure
2025-02-01 03:53:24 -08:00
omfs
fs: Convert aops->write_begin to take a folio
2024-08-07 11:33:21 +02:00
openpromfs
…
orangefs
Merge tag 'for-linus-6.14-ofs4' of git://git.kernel.org/pub/scm/linux/kernel/git/hubcap/linux
2025-01-31 09:40:31 -08:00
overlayfs
Merge tag 'pull-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2025-02-01 15:07:56 -08:00
proc
Merge tag 'pull-revalidate' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2025-01-30 09:13:35 -08:00
pstore
Merge tag 'pstore-v6.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux
2025-01-20 13:37:14 -08:00
qnx4
…
qnx6
fs/qnx6: Fix building with GCC 15
2024-12-03 10:40:36 +01:00
quota
treewide: const qualify ctl_tables where applicable
2025-01-28 13:48:37 +01:00
ramfs
…
romfs
romfs: fix romfs_read_folio()
2024-08-21 22:32:58 +02:00
smb
Merge tag 'v6.14-rc-smb3-client-fixes-part2' of git://git.samba.org/sfrench/cifs-2.6
2025-02-01 11:30:41 -08:00
squashfs
squashfs: convert squashfs_fill_page() to take a folio
2025-01-24 22:47:22 -08:00
sysfs
sysfs: constify bin_attribute argument of sysfs_bin_attr_simple_read()
2025-01-09 10:43:58 +01:00
sysv
buffer: Convert __block_write_begin() to take a folio
2024-08-07 11:33:36 +02:00
tests
execve: Move KUnit tests to tests/ subdirectory
2024-07-22 18:25:47 -07:00
tracefs
Pass parent directory inode and expected name to ->d_revalidate()
2025-01-27 19:25:23 -05:00
ubifs
ubifs: skip dumping tnc tree when zroot is null
2025-01-18 15:31:35 +01:00
udf
udf: Verify inode link counts before performing rename
2024-11-26 22:54:24 +01:00
ufs
ufs: ufs_sb_private_info: remove unused s_{2,3}apb fields
2024-11-12 19:02:12 -05:00
unicode
Revert "unicode: Don't special case ignorable code points"
2024-12-11 14:11:23 -08:00
vboxsf
Merge tag 'pull-revalidate' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2025-01-30 09:13:35 -08:00
verity
treewide: const qualify ctl_tables where applicable
2025-01-28 13:48:37 +01:00
xfs
treewide: const qualify ctl_tables where applicable
2025-01-28 13:48:37 +01:00
zonefs
Merge tag 'zonefs-6.12-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/dlemoal/zonefs
2024-10-02 12:02:15 -07:00
aio.c
treewide: const qualify ctl_tables where applicable
2025-01-28 13:48:37 +01:00
anon_inodes.c
add a string-to-qstr constructor
2025-01-27 19:25:45 -05:00
attr.c
fs: handle delegated timestamps in setattr_copy_mgtime
2024-10-10 10:20:51 +02:00
backing-file.c
tree-wide: s/revert_creds_light()/revert_creds()/g
2024-12-02 11:25:09 +01:00
bad_inode.c
…
binfmt_elf_fdpic.c
fs: don't block write during exec on pre-content watched files
2024-12-11 17:45:18 +01:00
binfmt_elf.c
fs: don't block write during exec on pre-content watched files
2024-12-11 17:45:18 +01:00
binfmt_flat.c
binfmt_flat: Fix integer overflow bug on 32 bit systems
2025-01-10 08:49:05 -08:00
binfmt_misc.c
Merge tag 'execve-v6.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux
2025-01-20 13:27:58 -08:00
binfmt_script.c
…
bpf_fs_kfuncs.c
bpf: Add kfunc bpf_get_dentry_xattr() to read xattr from dentry
2024-08-07 11:26:54 -07:00
buffer.c
Merge tag 'mm-stable-2024-11-18-19-27' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2024-11-23 09:58:07 -08:00
char_dev.c
fs: Reorganize kerneldoc parameter names
2024-10-22 11:16:57 +02:00
compat_binfmt_elf.c
binfmt_elf: Wire up AT_HWCAP3 at AT_HWCAP4
2024-10-17 18:38:49 +01:00
coredump.c
treewide: const qualify ctl_tables where applicable
2025-01-28 13:48:37 +01:00
d_path.c
…
dax.c
fsdax: dax_unshare_iter needs to copy entire blocks
2024-10-07 13:51:47 +02:00
dcache.c
Merge tag 'pull-revalidate' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2025-01-30 09:13:35 -08:00
direct-io.c
fs/direct-io: Remove linux/prefetch.h include
2024-08-19 13:45:02 +02:00
drop_caches.c
sysctl: treewide: constify the ctl_table argument of proc_handlers
2024-07-24 20:59:29 +02:00
eventfd.c
fdget(), trivial conversions
2024-11-03 01:28:06 -05:00
eventpoll.c
treewide: const qualify ctl_tables where applicable
2025-01-28 13:48:37 +01:00
exec.c
treewide: const qualify ctl_tables where applicable
2025-01-28 13:48:37 +01:00
fcntl.c
fs: get rid of __FMODE_NONOTIFY kludge
2024-12-09 11:34:29 +01:00
fhandle.c
exportfs: add permission method
2024-12-17 09:16:11 +01:00
file_table.c
Merge tag 'pull-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2025-02-01 15:07:56 -08:00
file.c
Merge tag 'vfs-6.14-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-01-20 09:40:49 -08:00
filesystems.c
…
fs_context.c
fs: fc_log replace magic number 7 with ARRAY_SIZE()
2024-12-22 11:29:52 +01:00
fs_parser.c
bcachefs: add support for true/false & yes/no in bool-type options
2024-12-21 01:36:17 -05:00
fs_pin.c
…
fs_struct.c
…
fs_types.c
…
fs-writeback.c
Merge patch series "two little writeback cleanups v2"
2024-11-13 14:08:34 +01:00
fsopen.c
fdget(), more trivial conversions
2024-11-03 01:28:06 -05:00
init.c
…
inode.c
treewide: const qualify ctl_tables where applicable
2025-01-28 13:48:37 +01:00
internal.h
Merge tag 'pull-statx' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2024-11-18 14:54:10 -08:00
ioctl.c
fdget(), trivial conversions
2024-11-03 01:28:06 -05:00
Kconfig
reiserfs: The last commit
2024-10-21 16:29:38 +02:00
Kconfig.binfmt
…
kernel_read_file.c
fdget(), trivial conversions
2024-11-03 01:28:06 -05:00
libfs.c
Merge tag 'pull-revalidate' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2025-01-30 09:13:35 -08:00
locks.c
treewide: const qualify ctl_tables where applicable
2025-01-28 13:48:37 +01:00
Makefile
reiserfs: The last commit
2024-10-21 16:29:38 +02:00
mbcache.c
…
mnt_idmapping.c
Merge tag 'fuse-update-6.12' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse
2024-09-24 15:29:42 -07:00
mount.h
fs: cache first and last mount
2025-01-09 16:58:54 +01:00
mpage.c
fs/writeback: convert wbc_account_cgroup_owner to take a folio
2024-10-28 13:26:54 +01:00
namei.c
Merge tag 'pull-revalidate' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2025-01-30 09:13:35 -08:00
namespace.c
treewide: const qualify ctl_tables where applicable
2025-01-28 13:48:37 +01:00
nsfs.c
fs: lockless mntns lookup for nsfs
2025-01-09 16:58:52 +01:00
open.c
fs: predict no error in close()
2025-03-05 18:25:36 +01:00
pidfs.c
pidfs: allow bind-mounts
2024-12-22 11:03:10 +01:00
pipe.c
treewide: const qualify ctl_tables where applicable
2025-01-28 13:48:37 +01:00
pnode.c
fs: Fix grammar and spelling in propagate_umount()
2024-12-22 11:29:52 +01:00
pnode.h
…
posix_acl.c
acl: Annotate struct posix_acl with __counted_by()
2024-10-22 11:16:59 +02:00
proc_namespace.c
fs: rename show_mnt_opts -> show_vfsmnt_opts
2024-06-28 14:36:43 +02:00
read_write.c
Merge tag 'pull-fd' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2024-11-18 12:24:06 -08:00
readdir.c
introduce "fd_pos" class, convert fdget_pos() users to it.
2024-11-03 01:28:06 -05:00
remap_range.c
convert vfs_dedupe_file_range().
2024-11-03 01:28:07 -05:00
select.c
select: Fix unbalanced user_access_end()
2025-01-13 16:24:16 +01:00
seq_file.c
fs: Reorganize kerneldoc parameter names
2024-10-22 11:16:57 +02:00
signalfd.c
fdget(), trivial conversions
2024-11-03 01:28:06 -05:00
splice.c
mm: alloc_pages_bulk: rename API
2025-01-25 20:22:31 -08:00
stack.c
…
stat.c
fs: add STATX_DIO_READ_ALIGN
2025-01-09 16:23:17 +01:00
statfs.c
fdget_raw() users: switch to CLASS(fd_raw)
2024-11-03 01:28:06 -05:00
super.c
lib/list_debug.c: add object information in case of invalid object
2025-01-25 20:22:23 -08:00
sync.c
fdget(), trivial conversions
2024-11-03 01:28:06 -05:00
sysctls.c
treewide: const qualify ctl_tables where applicable
2025-01-28 13:48:37 +01:00
timerfd.c
Merge tag 'timers-core-2024-11-18' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2024-11-19 16:35:06 -08:00
userfaultfd.c
treewide: const qualify ctl_tables where applicable
2025-01-28 13:48:37 +01:00
utimes.c
fdget(), more trivial conversions
2024-11-03 01:28:06 -05:00
xattr.c
xattr: remove redundant check on variable err
2024-11-06 13:00:01 -05:00