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- Stop testing the group->parent pointer as it is not guaranteed to be stable over a chain of operations by design. This includes a warning which would be nice to have but it produces false positives due to the racy nature of the check. - Plug a race between CPUs going in and out of idle and a CPU hotplug operation. The latter can create and connect a new hierarchy level which is missed in the concurrent updates of CPUs which go into idle. As a result the events of such a CPU might not be processed and timers go stale. Cure it by splitting the hotplug operation into a prepare and online callback. The prepare callback is guaranteed to run on an online and therefore active CPU. This CPU updates the hierarchy and being online ensures that there is always at least one migrator active which handles the modified hierarchy correctly when going idle. The online callback which runs on the incoming CPU then just marks the CPU active and brings it into operation. - Improve tracing and polish the code further so it is more obvious what's going on. -----BEGIN PGP SIGNATURE----- iQJHBAABCgAxFiEEQp8+kY+LLUocC4bMphj1TA10mKEFAmajmXYTHHRnbHhAbGlu dXRyb25peC5kZQAKCRCmGPVMDXSYoWaGD/4iAuj0S3AQ+odB/Fkg1cvCF8YbOJGy PEMSDnYtW7ErShEwVQMsWnXCFhIMuqMN0KIzOChpya2ZkmdT47mNwKuwdOMEQZzg dKhmqGWR+sk4LMszCFbf5u6JjJeQ+nnxthgJ1IieJwC4VEfRceXYk7ng6Wvu1+lU JEIukUh9nRJWma7FYW8MeNZ4lJGdvawZ5UjUAkPtzeKWn0+0/oqV5t1c8E/1jBbi sKZW2soL716Xd/3QJUKKmtAcH7yDFwq5AY5bJURr5ztJw/yr2loVdvAPEdn/RQ6f fzN/J+nu2ig14g/QvhI8Ke+HbHJEZHpo6simSZRbdaqnCX3R/lYZwLDe7EGjqKIb 0slsx2V1UxQ+qIYRplrtr/HGChjG/mXDLPIWRWjsiUAqyygy6QtUIko9AuH99Kd6 7cBjOzajKIAA/J9SUD03VgjXcQ53bW64NMe2pOX9ED1mbfmmu/ROd0neOgksKw5o G5XQ+T6tNOoHMzJgv4R8PiViVdrf53A/g1wYTY1RR3XI8IWpounkyDExDvbtigGo N+reKoawDGpXeMAByO2E6UDFNA05NYPjlvSrzTS5ywwyF1qCowKI1Qyup9wA/God WJvfesmOJHtfcuUcVZf6Pm6+otJiKrT3reauFd6laEbyRuGTKvtNN/pQa6yxiZzT FTxZKpcYkPE76g== =G1Lg -----END PGP SIGNATURE----- Merge tag 'timers-urgent-2024-07-26' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull timer migration updates from Thomas Gleixner: "Fixes and minor updates for the timer migration code: - Stop testing the group->parent pointer as it is not guaranteed to be stable over a chain of operations by design. This includes a warning which would be nice to have but it produces false positives due to the racy nature of the check. - Plug a race between CPUs going in and out of idle and a CPU hotplug operation. The latter can create and connect a new hierarchy level which is missed in the concurrent updates of CPUs which go into idle. As a result the events of such a CPU might not be processed and timers go stale. Cure it by splitting the hotplug operation into a prepare and online callback. The prepare callback is guaranteed to run on an online and therefore active CPU. This CPU updates the hierarchy and being online ensures that there is always at least one migrator active which handles the modified hierarchy correctly when going idle. The online callback which runs on the incoming CPU then just marks the CPU active and brings it into operation. - Improve tracing and polish the code further so it is more obvious what's going on" * tag 'timers-urgent-2024-07-26' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: timers/migration: Fix grammar in comment timers/migration: Spare write when nothing changed timers/migration: Rename childmask by groupmask to make naming more obvious timers/migration: Read childmask and parent pointer in a single place timers/migration: Use a single struct for hierarchy walk data timers/migration: Improve tracing timers/migration: Move hierarchy setup into cpuhotplug prepare callback timers/migration: Do not rely always on group->parent |
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bpf | ||
cgroup | ||
configs | ||
debug | ||
dma | ||
entry | ||
events | ||
futex | ||
gcov | ||
irq | ||
kcsan | ||
livepatch | ||
locking | ||
module | ||
power | ||
printk | ||
rcu | ||
sched | ||
time | ||
trace | ||
.gitignore | ||
acct.c | ||
async.c | ||
audit_fsnotify.c | ||
audit_tree.c | ||
audit_watch.c | ||
audit.c | ||
audit.h | ||
auditfilter.c | ||
auditsc.c | ||
backtracetest.c | ||
bounds.c | ||
capability.c | ||
cfi.c | ||
compat.c | ||
configs.c | ||
context_tracking.c | ||
cpu_pm.c | ||
cpu.c | ||
crash_core.c | ||
crash_reserve.c | ||
cred.c | ||
delayacct.c | ||
dma.c | ||
elfcorehdr.c | ||
exec_domain.c | ||
exit.c | ||
exit.h | ||
extable.c | ||
fail_function.c | ||
fork.c | ||
freezer.c | ||
gen_kheaders.sh | ||
groups.c | ||
hung_task.c | ||
iomem.c | ||
irq_work.c | ||
jump_label.c | ||
kallsyms_internal.h | ||
kallsyms_selftest.c | ||
kallsyms_selftest.h | ||
kallsyms.c | ||
kcmp.c | ||
Kconfig.freezer | ||
Kconfig.hz | ||
Kconfig.kexec | ||
Kconfig.locks | ||
Kconfig.preempt | ||
kcov.c | ||
kexec_core.c | ||
kexec_elf.c | ||
kexec_file.c | ||
kexec_internal.h | ||
kexec.c | ||
kheaders.c | ||
kprobes.c | ||
ksyms_common.c | ||
ksysfs.c | ||
kthread.c | ||
latencytop.c | ||
Makefile | ||
module_signature.c | ||
notifier.c | ||
nsproxy.c | ||
numa.c | ||
padata.c | ||
panic.c | ||
params.c | ||
pid_namespace.c | ||
pid_sysctl.h | ||
pid.c | ||
profile.c | ||
ptrace.c | ||
range.c | ||
reboot.c | ||
regset.c | ||
relay.c | ||
resource_kunit.c | ||
resource.c | ||
rseq.c | ||
scftorture.c | ||
scs.c | ||
seccomp.c | ||
signal.c | ||
smp.c | ||
smpboot.c | ||
smpboot.h | ||
softirq.c | ||
stackleak.c | ||
stacktrace.c | ||
static_call_inline.c | ||
static_call.c | ||
stop_machine.c | ||
sys_ni.c | ||
sys.c | ||
sysctl-test.c | ||
sysctl.c | ||
task_work.c | ||
taskstats.c | ||
torture.c | ||
tracepoint.c | ||
tsacct.c | ||
ucount.c | ||
uid16.c | ||
uid16.h | ||
umh.c | ||
up.c | ||
user_namespace.c | ||
user-return-notifier.c | ||
user.c | ||
usermode_driver.c | ||
utsname_sysctl.c | ||
utsname.c | ||
vhost_task.c | ||
vmcore_info.c | ||
watch_queue.c | ||
watchdog_buddy.c | ||
watchdog_perf.c | ||
watchdog.c | ||
workqueue_internal.h | ||
workqueue.c |