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5fdfa161b2043001f82cbce49e87e8e9f581d510
linux/kernel
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Uros Bizjak 5fdfa161b2 task_work: use try_cmpxchg in task_work_add, task_work_cancel_match and task_work_run 
Use try_cmpxchg instead of cmpxchg (*ptr, old, new) == old in
task_work_add, task_work_cancel_match and task_work_run.  x86 CMPXCHG
instruction returns success in ZF flag, so this change saves a compare
after cmpxchg (and related move instruction in front of cmpxchg).

Also, atomic_try_cmpxchg implicitly assigns old *ptr value to "old"
when cmpxchg fails, enabling further code simplifications.

The patch avoids extra memory read in case cmpxchg fails.

Link: https://lkml.kernel.org/r/20220823152632.4517-1-ubizjak@gmail.com
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2022-09-11 21:55:10 -07:00
..
bpf
net: Fix suspicious RCU usage in bpf_sk_reuseport_detach()
2022-08-17 16:42:59 -07:00
cgroup
cgroup: Add missing cpus_read_lock() to cgroup_attach_task_all()
2022-08-25 07:36:30 -10:00
configs
Merge tag 'for-linus-6.0-rc1b-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip
2022-08-14 09:28:54 -07:00
debug
Merge tag 'modules-5.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux
2022-05-26 17:13:43 -07:00
dma
Merge tag 'rproc-v5.20' of git://git.kernel.org/pub/scm/linux/kernel/git/remoteproc/linux
2022-08-08 15:16:29 -07:00
entry
context_tracking: Take NMI eqs entrypoints over RCU
2022-07-05 13:32:59 -07:00
events
Merge tag 'perf-urgent-2022-08-06' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2022-08-06 17:28:12 -07:00
futex
Merge tag 'drm-next-2022-05-25' of git://anongit.freedesktop.org/drm/drm
2022-05-25 16:18:27 -07:00
gcov
gcov: Remove compiler version check
2021-12-02 17:25:21 +09:00
irq
Merge tag 'irqchip-5.20' of git://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms into irq/core
2022-07-28 12:36:35 +02:00
kcsan
kcsan: test: Add a .kunitconfig to run KCSAN tests
2022-07-22 09:22:59 -06:00
livepatch
Merge tag 'livepatching-for-5.19' of git://git.kernel.org/pub/scm/linux/kernel/git/livepatching/livepatching
2022-06-02 08:55:01 -07:00
locking
Merge tag 'rcu.2022.07.26a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu
2022-08-02 19:12:45 -07:00
module
module: kunit: Load .kunit_test_suites section when CONFIG_KUNIT=m
2022-08-15 13:51:07 -06:00
power
Merge tag 'char-misc-6.0-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc
2022-08-04 11:05:48 -07:00
printk
printk: do not wait for consoles when suspended
2022-07-15 10:52:11 +02:00
rcu
Merge tag 'mm-stable-2022-08-03' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2022-08-05 16:32:45 -07:00
sched
wait_on_bit: add an acquire memory barrier
2022-08-26 09:30:25 -07:00
time
time: Correct the prototype of ns_to_kernel_old_timeval and ns_to_timespec64
2022-08-09 20:02:13 +02:00
trace
ftrace: Fix build warning for ops_references_rec() not used
2022-08-22 09:41:12 -04:00
.gitignore
.gitignore: prefix local generated files with a slash
2021-05-02 00:43:35 +09:00
acct.c
kernel/acct: move acct sysctls to its own file
2022-04-06 13:43:44 -07:00
async.c
Revert "module, async: async_synchronize_full() on module init iff async is used"
2022-02-03 11:20:34 -08:00
audit_fsnotify.c
audit: fix potential double free on error path from fsnotify_add_inode_mark
2022-08-22 18:50:06 -04:00
audit_tree.c
audit: use fsnotify group lock helpers
2022-04-25 14:37:28 +02:00
audit_watch.c
fsnotify: pass flags argument to fsnotify_alloc_group()
2022-04-25 14:37:12 +02:00
audit.c
audit: make is_audit_feature_set() static
2022-06-13 14:08:57 -04:00
audit.h
audit: log AUDIT_TIME_* records only from rules
2022-02-22 13:51:40 -05:00
auditfilter.c
Merge tag 'audit-pr-20220110' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/audit
2022-01-11 13:08:21 -08:00
auditsc.c
audit: move audit_return_fixup before the filters
2022-08-25 17:25:08 -04:00
backtracetest.c
treewide: Replace DECLARE_TASKLET() with DECLARE_TASKLET_OLD()
2020-07-30 11:15:58 -07:00
bounds.c
…
capability.c
xfs: don't generate selinux audit messages for capability testing
2022-03-09 10:32:06 -08:00
cfi.c
context_tracking: Take IRQ eqs entrypoints over RCU
2022-07-05 13:32:59 -07:00
compat.c
arch: remove compat_alloc_user_space
2021-09-08 15:32:35 -07:00
configs.c
…
context_tracking.c
MAINTAINERS: Add Paul as context tracking maintainer
2022-07-05 13:33:00 -07:00
cpu_pm.c
context_tracking: Take IRQ eqs entrypoints over RCU
2022-07-05 13:32:59 -07:00
cpu.c
Merge tag 'x86_tdx_for_v5.19_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2022-05-23 17:51:12 -07:00
crash_core.c
vmcoreinfo: add kallsyms_num_syms symbol
2022-08-28 14:02:44 -07:00
crash_dump.c
…
cred.c
x86: Mark __invalid_creds() __noreturn
2022-03-15 10:32:44 +01:00
delayacct.c
delayacct: track delays from write-protect copy
2022-06-01 15:55:25 -07:00
dma.c
…
exec_domain.c
…
exit.c
kernel: exit: cleanup release_thread()
2022-09-11 21:55:07 -07:00
extable.c
context_tracking: Take NMI eqs entrypoints over RCU
2022-07-05 13:32:59 -07:00
fail_function.c
fault-injection: handle EI_ETYPE_TRUE
2020-12-15 22:46:19 -08:00
fork.c
Merge tag 'trace-v6.0' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
2022-08-05 09:41:12 -07:00
freezer.c
sched: Add get_current_state()
2021-06-18 11:43:08 +02:00
gen_kheaders.sh
kheaders: Have cpio unconditionally replace files
2022-05-08 03:16:59 +09:00
groups.c
security: Add LSM hook to setgroups() syscall
2022-07-15 18:21:49 +00:00
hung_task.c
kernel/hung_task: fix address space of proc_dohung_task_timeout_secs
2022-07-29 18:12:35 -07:00
iomem.c
…
irq_work.c
irq_work: use kasan_record_aux_stack_noalloc() record callstack
2022-04-15 14:49:55 -07:00
jump_label.c
jump_label: make initial NOP patching the special case
2022-06-24 09:48:55 +02:00
kallsyms_internal.h
kallsyms: move declarations to internal header
2022-07-17 17:31:39 -07:00
kallsyms.c
Merge tag 'mm-nonmm-stable-2022-08-06-2' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2022-08-07 10:03:24 -07:00
kcmp.c
Merge branch 'exec-update-lock-for-v5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2020-12-15 19:36:48 -08:00
Kconfig.freezer
…
Kconfig.hz
…
Kconfig.locks
locking/rwlock: Provide RT variant
2021-08-17 17:50:51 +02:00
Kconfig.preempt
Revert "signal, x86: Delay calling signals in atomic on RT enabled kernels"
2022-03-31 10:36:55 +02:00
kcov.c
kcov: update pos before writing pc in trace function
2022-05-25 13:05:42 -07:00
kexec_core.c
kexec: replace kmap() with kmap_local_page()
2022-09-11 21:55:08 -07:00
kexec_elf.c
…
kexec_file.c
panic, kexec: make __crash_kexec() NMI safe
2022-09-11 21:55:06 -07:00
kexec_internal.h
panic, kexec: make __crash_kexec() NMI safe
2022-09-11 21:55:06 -07:00
kexec.c
panic, kexec: make __crash_kexec() NMI safe
2022-09-11 21:55:06 -07:00
kheaders.c
…
kmod.c
modules: add CONFIG_MODPROBE_PATH
2021-05-07 00:26:33 -07:00
kprobes.c
kprobes: don't call disarm_kprobe() for disabled kprobes
2022-08-20 15:17:46 -07:00
ksysfs.c
kexec: turn all kexec_mutex acquisitions into trylocks
2022-09-11 21:55:06 -07:00
kthread.c
kthread: make it clear that kthread_create_on_node() might be terminated by any fatal signal
2022-06-16 19:11:30 -07:00
latencytop.c
latencytop: move sysctl to its own file
2022-04-21 11:40:59 -07:00
Makefile
kernel: remove platform_has() infrastructure
2022-08-01 07:42:56 +02:00
module_signature.c
module: harden ELF info handling
2021-01-19 10:24:45 +01:00
notifier.c
notifier: Add blocking/atomic_notifier_chain_register_unique_prio()
2022-05-19 19:30:30 +02:00
nsproxy.c
fs/exec: allow to unshare a time namespace on vfork+exec
2022-06-15 07:58:04 -07:00
padata.c
padata: replace cpumask_weight with cpumask_empty in padata.c
2022-01-31 11:21:46 +11:00
panic.c
Merge tag 'linux-kselftest-kunit-5.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest
2022-08-02 19:34:45 -07:00
params.c
kobject: remove kset from struct kset_uevent_ops callbacks
2021-12-28 11:26:18 +01:00
pid_namespace.c
kernel: pid_namespace: use NULL instead of using plain integer as pointer
2022-04-29 14:38:00 -07:00
pid.c
pid: add pidfd_get_task() helper
2021-10-14 13:29:18 +02:00
profile.c
profile: setup_profiling_timer() is moslty not implemented
2022-07-29 18:12:36 -07:00
ptrace.c
ptrace: fix clearing of JOBCTL_TRACED in ptrace_unfreeze_traced()
2022-07-09 11:06:19 -07:00
range.c
kernel.h: split out min()/max() et al. helpers
2020-10-16 11:11:19 -07:00
reboot.c
Merge branch 'rework/kthreads' into for-linus
2022-06-23 19:11:28 +02:00
regset.c
regset: kill ->get()
2020-07-27 14:31:12 -04:00
relay.c
relay: remove redundant assignment to pointer buf
2022-05-12 20:38:37 -07:00
resource_kunit.c
resource: provide meaningful MODULE_LICENSE() in test suite
2020-11-25 18:52:35 +01:00
resource.c
resource: Introduce alloc_free_mem_region()
2022-07-21 17:19:25 -07:00
rseq.c
rseq: Kill process when unknown flags are encountered in ABI structures
2022-08-01 15:21:42 +02:00
scftorture.c
scftorture: Fix distribution of short handler delays
2022-04-11 17:07:29 -07:00
scs.c
kasan, vmalloc: only tag normal vmalloc allocations
2022-03-24 19:06:48 -07:00
seccomp.c
seccomp: Add wait_killable semantic to seccomp user notifier
2022-05-03 14:11:58 -07:00
signal.c
signal handling: don't use BUG_ON() for debugging
2022-07-07 09:53:43 -07:00
smp.c
locking/csd_lock: Change csdlock_debug from early_param to __setup
2022-07-19 11:40:00 -07:00
smpboot.c
cpu/hotplug: Allow the CPU in CPU_UP_PREPARE state to be brought up again.
2022-04-12 14:13:01 +02:00
smpboot.h
…
softirq.c
context_tracking: Take IRQ eqs entrypoints over RCU
2022-07-05 13:32:59 -07:00
stackleak.c
stackleak: add on/off stack variants
2022-05-08 01:33:09 -07:00
stacktrace.c
uaccess: remove CONFIG_SET_FS
2022-02-25 09:36:06 +01:00
static_call_inline.c
static_call: Don't make __static_call_return0 static
2022-04-05 09:59:38 +02:00
static_call.c
static_call: Don't make __static_call_return0 static
2022-04-05 09:59:38 +02:00
stop_machine.c
Merge tag 'sched-core-2022-05-23' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2022-05-24 11:11:13 -07:00
sys_ni.c
kernel/sys_ni: add compat entry for fadvise64_64
2022-08-20 15:17:45 -07:00
sys.c
arm64/sme: Implement vector length configuration prctl()s
2022-04-22 18:50:54 +01:00
sysctl-test.c
kernel/sysctl-test: Remove some casts which are no-longer required
2021-06-23 16:41:24 -06:00
sysctl.c
kernel/sysctl.c: Remove trailing white space
2022-08-08 09:01:36 -07:00
task_work.c
task_work: use try_cmpxchg in task_work_add, task_work_cancel_match and task_work_run
2022-09-11 21:55:10 -07:00
taskstats.c
kernel: make taskstats available from all net namespaces
2022-04-29 14:38:03 -07:00
torture.c
torture: Wake up kthreads after storing task_struct pointer
2022-02-01 17:24:39 -08:00
tracepoint.c
tracepoint: Fix kerneldoc comments
2021-08-16 11:39:51 -04:00
tsacct.c
taskstats: version 12 with thread group and exe info
2022-04-29 14:38:03 -07:00
ucount.c
ucounts: Handle wrapping in is_ucounts_overlimit
2022-02-17 09:11:57 -06:00
uid16.c
…
uid16.h
…
umh.c
kthread: Don't allocate kthread_struct for init and umh
2022-05-06 14:49:44 -05:00
up.c
Merge tag 'locking-urgent-2021-05-09' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2021-05-09 13:07:03 -07:00
user_namespace.c
ucounts: Fix systemd LimitNPROC with private users regression
2022-02-25 10:40:14 -06:00
user-return-notifier.c
…
user.c
fs/epoll: use a per-cpu counter for user's watches count
2021-09-08 11:50:27 -07:00
usermode_driver.c
blob_to_mnt(): kern_unmount() is needed to undo kern_mount()
2022-05-19 23:25:47 -04:00
utsname_sysctl.c
…
utsname.c
uts: Use generic ns_common::count
2020-08-19 14:13:20 +02:00
watch_queue.c
Merge tag 'docs-6.0' of git://git.lwn.net/linux
2022-08-02 19:24:24 -07:00
watchdog_hld.c
Revert "printk: add functions to prefer direct printing"
2022-06-23 18:41:40 +02:00
watchdog.c
Merge tag 'powerpc-6.0-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
2022-08-06 16:38:17 -07:00
workqueue_internal.h
workqueue: Assign a color to barrier work items
2021-08-17 07:49:10 -10:00
workqueue.c
Merge tag 'drm-next-2022-08-03' of git://anongit.freedesktop.org/drm/drm
2022-08-03 19:52:08 -07:00