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93c43008368d60f2cb11cc239a3219a2f4142c30
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Yunfeng Ye 93c4300836 tick/sched: Reduce seqcount held scope in tick_do_update_jiffies64() 
[ Upstream commit 94ad2e3ced ]

If jiffies are up to date already (caller lost the race against another
CPU) there is no point to change the sequence count. Doing that just forces
other CPUs into the seqcount retry loop in tick_nohz_next_event() for
nothing.

Just bail out early.

[ tglx: Rewrote most of it ]

Signed-off-by: Yunfeng Ye <yeyunfeng@huawei.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20201117132006.462195901@linutronix.de
Stable-dep-of: e9523a0d81 ("tick/common: Align tick period with the HZ tick.")
Signed-off-by: Sasha Levin <sashal@kernel.org>
2023-05-17 11:47:45 +02:00
..
bpf
bpf: Fix incorrect verifier pruning due to missing register precision taints
2023-04-26 11:27:36 +02:00
cgroup
cgroup/cpuset: Wake up cpuset_attach_wq tasks in cpuset_cancel_attach()
2023-04-20 12:10:27 +02:00
configs
…
debug
lockdown: also lock down previous kgdb use
2022-05-30 09:33:22 +02:00
dma
swiotlb: max mapping size takes min align mask into account
2022-10-05 10:38:40 +02:00
entry
entry/kvm: Exit to user mode when TIF_NOTIFY_SIGNAL is set
2023-01-04 11:39:22 +01:00
events
perf/core: Fix the same task check in perf_event_set_output
2023-04-20 12:10:23 +02:00
futex
futex: Resend potentially swallowed owner death notification
2023-01-14 10:15:20 +01:00
gcov
gcov: add support for checksum field
2023-01-14 10:16:24 +01:00
irq
irqdomain: Fix domain registration race
2023-03-17 08:45:08 +01:00
kcsan
kcsan: avoid passing -g for test
2023-04-05 11:23:44 +02:00
livepatch
livepatch: fix race between fork and KLP transition
2022-10-26 13:25:14 +02:00
locking
locking/lockdep: Fix lockdep_init_map_*() confusion
2022-08-21 15:15:33 +02:00
power
PM: EM: fix memory leak with using debugfs_lookup()
2023-03-11 16:39:51 +01:00
printk
printk: fix return value of printk.devkmsg __setup handler
2022-04-08 14:40:08 +02:00
rcu
rcu: Avoid stack overflow due to __rcu_irq_enter_check_tick() being kprobe-ed
2023-05-17 11:47:34 +02:00
sched
sched/fair: Fixes for capacity inversion detection
2023-04-26 11:27:39 +02:00
time
tick/sched: Reduce seqcount held scope in tick_do_update_jiffies64()
2023-05-17 11:47:45 +02:00
trace
ring-buffer: Sync IRQ works before buffer destruction
2023-05-17 11:47:33 +02:00
.gitignore
kbuild: update config_data.gz only when the content of .config is changed
2021-05-11 14:47:37 +02:00
acct.c
acct: fix potential integer overflow in encode_comp_t()
2023-01-14 10:16:14 +01:00
async.c
Revert "module, async: async_synchronize_full() on module init iff async is used"
2022-02-23 12:01:00 +01:00
audit_fsnotify.c
audit: fix potential double free on error path from fsnotify_add_inode_mark
2022-08-31 17:15:13 +02:00
audit_tree.c
audit: move put_tree() to avoid trim_trees refcount underflow and UAF
2021-09-03 10:09:31 +02:00
audit_watch.c
fsnotify: generalize handle_inode_event()
2020-12-30 11:54:18 +01:00
audit.c
audit: improve audit queue handling when "audit=1" on cmdline
2022-02-08 18:30:34 +01:00
audit.h
audit: log AUDIT_TIME_* records only from rules
2022-04-08 14:40:00 +02:00
auditfilter.c
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
auditsc.c
audit: log AUDIT_TIME_* records only from rules
2022-04-08 14:40:00 +02:00
backtracetest.c
treewide: Replace DECLARE_TASKLET() with DECLARE_TASKLET_OLD()
2020-07-30 11:15:58 -07:00
bounds.c
…
capability.c
LSM: Signal to SafeSetID when setting group IDs
2020-10-13 09:17:34 -07:00
compat.c
sched_getaffinity: don't assume 'cpumask_size()' is fully initialized
2023-04-05 11:23:45 +02:00
configs.c
…
context_tracking.c
…
cpu_pm.c
PM: cpu: Make notifier chain use a raw_spinlock_t
2021-09-15 09:50:40 +02:00
cpu.c
cpu/hotplug: Make target_store() a nop when target == state
2023-01-14 10:15:20 +01:00
crash_core.c
crash_core, vmcoreinfo: append 'SECTION_SIZE_BITS' to vmcoreinfo
2021-06-23 14:42:52 +02:00
crash_dump.c
…
cred.c
Revert "Add a reference to ucounts for each cred"
2021-09-08 08:49:00 +02:00
delayacct.c
…
dma.c
…
exec_domain.c
…
exit.c
exit: Use READ_ONCE() for all oops/warn limit reads
2023-02-01 08:23:21 +01:00
extable.c
…
fail_function.c
kernel/fail_function: fix memory leak with using debugfs_lookup()
2023-03-11 16:40:18 +01:00
fork.c
seccomp: Move copy_seccomp() to no failure path.
2023-05-17 11:47:27 +02:00
freezer.c
Revert "kernel: freezer should treat PF_IO_WORKER like PF_KTHREAD for freezing"
2021-04-07 15:00:14 +02:00
gen_kheaders.sh
…
groups.c
LSM: Signal to SafeSetID when setting group IDs
2020-10-13 09:17:34 -07:00
hung_task.c
kernel/hung_task.c: make type annotations consistent
2020-11-02 12:14:19 -08:00
iomem.c
…
irq_work.c
…
jump_label.c
jump_label: Fix jump_label_text_reserved() vs __init
2021-07-20 16:05:58 +02:00
kallsyms.c
treewide: Convert macro and uses of __section(foo) to __section("foo")
2020-10-25 14:51:49 -07:00
kcmp.c
exec: Transform exec_update_mutex into a rw_semaphore
2021-01-09 13:46:24 +01:00
Kconfig.freezer
…
Kconfig.hz
…
Kconfig.locks
…
Kconfig.preempt
…
kcov.c
kcov: make some symbols static
2020-08-12 10:58:02 -07:00
kexec_core.c
panic, kexec: make __crash_kexec() NMI safe
2023-04-20 12:10:29 +02:00
kexec_elf.c
…
kexec_file.c
panic, kexec: make __crash_kexec() NMI safe
2023-04-20 12:10:29 +02:00
kexec_internal.h
panic, kexec: make __crash_kexec() NMI safe
2023-04-20 12:10:29 +02:00
kexec.c
panic, kexec: make __crash_kexec() NMI safe
2023-04-20 12:10:29 +02:00
kheaders.c
kheaders: Use array declaration instead of char
2023-05-17 11:47:33 +02:00
kmod.c
kmod: remove redundant "be an" in the comment
2020-08-12 10:58:01 -07:00
kprobes.c
x86/kprobes: Fix arch_check_optimized_kprobe check within optimized_kprobe range
2023-03-11 16:39:59 +01:00
ksysfs.c
kexec: turn all kexec_mutex acquisitions into trylocks
2023-04-20 12:10:29 +02:00
kthread.c
kthread: Fix PF_KTHREAD vs to_kthread() race
2021-09-03 10:09:31 +02:00
latencytop.c
…
Makefile
futex: Move to kernel/futex/
2023-01-14 10:15:20 +01:00
module_signature.c
module: harden ELF info handling
2021-03-25 09:04:11 +01:00
module_signing.c
module: harden ELF info handling
2021-03-25 09:04:11 +01:00
module-internal.h
…
module.c
module: Don't wait for GOING modules
2023-02-01 08:23:22 +01:00
notifier.c
notifier: Fix broken error handling pattern
2020-09-01 09:58:03 +02:00
nsproxy.c
…
padata.c
padata: Fix list iterator in padata_do_serial()
2023-01-14 10:15:51 +01:00
panic.c
exit: Use READ_ONCE() for all oops/warn limit reads
2023-02-01 08:23:21 +01:00
params.c
params: Replace zero-length array with flexible-array member
2020-10-29 17:22:59 -05:00
pid_namespace.c
rcu-tasks: Fix synchronize_rcu_tasks() VS zap_pid_ns_processes()
2023-03-11 16:39:19 +01:00
pid.c
exec: Transform exec_update_mutex into a rw_semaphore
2021-01-09 13:46:24 +01:00
profile.c
profiling: fix shift too large makes kernel panic
2022-08-21 15:16:05 +02:00
ptrace.c
ptrace: Reimplement PTRACE_KILL by always sending SIGKILL
2022-06-09 10:20:49 +02:00
range.c
kernel.h: split out min()/max() et al. helpers
2020-10-16 11:11:19 -07:00
reboot.c
reboot: fix overflow parsing reboot cpu number
2020-11-14 11:26:03 -08:00
regset.c
regset: kill ->get()
2020-07-27 14:31:12 -04:00
relay.c
relayfs: fix out-of-bounds access in relay_file_read
2023-05-17 11:47:34 +02:00
resource.c
dax/kmem: Fix leak of memory-hotplug resources
2023-03-11 16:40:04 +01:00
rseq.c
rseq: Remove broken uapi field layout on 32-bit little endian
2022-04-08 14:40:03 +02:00
scftorture.c
scftorture: Fix distribution of short handler delays
2022-06-09 10:21:01 +02:00
scs.c
mm: memcontrol: account kernel stack per node
2020-08-07 11:33:25 -07:00
seccomp.c
seccomp: Fix setting loaded filter count during TSYNC
2021-08-18 08:59:06 +02:00
signal.c
task_work: unconditionally run task_work from get_signal()
2023-01-04 11:39:23 +01:00
smp.c
smp: Fix offline cpu check in flush_smp_call_function_queue()
2022-04-20 09:23:29 +02:00
smpboot.c
sched/core: Initialize the idle task with preemption disabled
2021-07-14 16:55:50 +02:00
smpboot.h
…
softirq.c
softirq: Add debug check to __raise_softirq_irqoff()
2020-09-16 15:18:56 +02:00
stackleak.c
gcc-plugins/stackleak: Use noinstr in favor of notrace
2022-02-23 12:01:00 +01:00
stacktrace.c
stacktrace: Remove reliable argument from arch_stack_walk() callback
2020-09-18 14:24:16 +01:00
static_call.c
static_call: Fix unused variable warn w/o MODULE
2021-09-08 08:49:00 +02:00
stop_machine.c
stop_machine, rcu: Mark functions as notrace
2020-10-26 12:12:27 +01:00
sys_ni.c
kernel/sys_ni: add compat entry for fadvise64_64
2022-08-31 17:15:13 +02:00
sys.c
kernel/sys.c: fix and improve control flow in __sys_setres[ug]id()
2023-04-26 11:27:38 +02:00
sysctl-test.c
…
sysctl.c
sysctl: Fix data-races in proc_dou8vec_minmax().
2023-04-20 12:10:29 +02:00
task_work.c
task_work: add helper for more targeted task_work canceling
2023-01-04 11:39:23 +01:00
taskstats.c
taskstats: move specifying netlink policy back to ops
2020-10-02 19:11:12 -07:00
test_kprobes.c
…
torture.c
…
tracepoint.c
tracepoint: Use rcu get state and cond sync for static call updates
2021-09-03 10:09:30 +02:00
tsacct.c
taskstats: Cleanup the use of task->exit_code
2022-01-27 10:54:33 +01:00
ucount.c
Revert "Add a reference to ucounts for each cred"
2021-09-08 08:49:00 +02:00
uid16.c
…
uid16.h
…
umh.c
usermodehelper: reset umask to default before executing user process
2020-10-06 10:31:52 -07:00
up.c
smp: Fix smp_call_function_single_async prototype
2021-05-14 09:50:46 +02:00
user_namespace.c
Revert "Add a reference to ucounts for each cred"
2021-09-08 08:49:00 +02:00
user-return-notifier.c
…
user.c
…
usermode_driver.c
bpf: Fix umd memory leak in copy_process()
2021-03-30 14:32:03 +02:00
utsname_sysctl.c
…
utsname.c
…
watch_queue.c
watch_queue: fix IOC_WATCH_QUEUE_SET_SIZE alloc error paths
2023-03-17 08:45:13 +01:00
watchdog_hld.c
…
watchdog.c
watchdog: export lockup_detector_reconfigure
2022-08-25 11:38:20 +02:00
workqueue_internal.h
…
workqueue.c
workqueue: don't skip lockdep work dependency in cancel_work_sync()
2022-09-28 11:10:40 +02:00