Waiman Long 7a60c21384 cgroup/cpuset: Fix a partition error with CPU hotplug ... [ Upstream commit 150e298ae0 ] It was found during testing that an invalid leaf partition with an empty effective exclusive CPU list can become a valid empty partition with no CPU afer an offline/online operation of an unrelated CPU. An empty partition root is allowed in the special case that it has no task in its cgroup and has distributed out all its CPUs to its child partitions. That is certainly not the case here. The problem is in the cpumask_subsets() test in the hotplug case (update with no new mask) of update_parent_effective_cpumask() as it also returns true if the effective exclusive CPU list is empty. Fix that by addding the cpumask_empty() test to root out this exception case. Also add the cpumask_empty() test in cpuset_hotplug_update_tasks() to avoid calling update_parent_effective_cpumask() for this special case. Fixes: 0c7f293efc ("cgroup/cpuset: Add cpuset.cpus.exclusive.effective for v2") Signed-off-by: Waiman Long <longman@redhat.com> Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		2025-08-28 16:31:11 +02:00
..
bpf	bpf: Make reg_not_null() true for CONST_PTR_TO_MAP	2025-08-20 18:30:39 +02:00
cgroup	cgroup/cpuset: Fix a partition error with CPU hotplug	2025-08-28 16:31:11 +02:00
configs
debug
dma	dma-mapping: Fix warning reported for missing prototype	2025-05-29 11:01:59 +02:00
entry
events	perf/core: Prevent VMA split of buffer mappings	2025-08-15 12:14:09 +02:00
futex	futex: Pass in task to futex_queue()	2025-03-22 12:54:14 -07:00
gcov
irq	genirq/irq_sim: Initialize work context pointers properly	2025-07-10 16:05:07 +02:00
kcsan	kcsan: test: Initialize dummy variable	2025-08-15 12:13:46 +02:00
livepatch
locking	locking/lockdep: Decrease nr_unused_locks if lock unused in zap_class()	2025-04-20 10:15:45 +02:00
module	module: Prevent silent truncation of module name in delete_module(2)	2025-08-20 18:30:46 +02:00
power	PM: sleep: console: Fix the black screen issue	2025-08-20 18:30:25 +02:00
printk	printk: nbcon: Allow reacquire during panic	2025-08-20 18:30:47 +02:00
rcu	rcu: Fix racy re-initialization of irq_work causing hangs	2025-08-20 18:30:58 +02:00
sched	sched_ext: initialize built-in idle state before ops.init()	2025-08-28 16:31:05 +02:00
time	timekeeping: Zero initialize system_counterval when querying time from phc drivers	2025-08-01 09:48:42 +01:00
trace	tracing: Limit access to parser->buffer when trace_get_user failed	2025-08-28 16:31:10 +02:00
.gitignore
acct.c	acct: block access to kernel internal filesystems	2025-02-27 04:30:23 -08:00
async.c
audit_fsnotify.c
audit_tree.c
audit_watch.c
audit.c
audit.h	audit,module: restore audit logging in load failure case	2025-08-15 12:13:31 +02:00
auditfilter.c
auditsc.c	audit,module: restore audit logging in load failure case	2025-08-15 12:13:31 +02:00
backtracetest.c
bounds.c
capability.c
cfi.c
compat.c
configs.c
context_tracking.c
cpu_pm.c
cpu.c	watchdog/hardlockup/perf: Fix perf_event memory leak	2025-04-10 14:39:11 +02:00
crash_core.c
crash_reserve.c
cred.c
delayacct.c
dma.c
elfcorehdr.c
exec_domain.c
exit.c	perf: Fix sample vs do_exit()	2025-06-27 11:11:45 +01:00
exit.h
extable.c
fail_function.c
fork.c	kernel/fork: only call untrack_pfn_clear() on VMAs duplicated for fork()	2025-05-29 11:03:14 +02:00
freezer.c	sched,freezer: Remove unnecessary warning in __thaw_task	2025-07-24 08:56:37 +02:00
gen_kheaders.sh	kheaders: Ignore silly-rename files	2025-01-23 17:22:55 +01:00
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	kcov: mark in_softirq_really() as __always_inline	2025-01-09 13:33:49 +01:00
kexec_core.c
kexec_elf.c	kexec: initialize ELF lowest address to ULONG_MAX	2025-04-10 14:39:24 +02:00
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
padata.c	padata: do not leak refcount in reorder_work	2025-05-29 11:03:19 +02:00
panic.c	objtool, panic: Disable SMAP in __stack_chk_fail()	2025-05-02 07:59:19 +02:00
params.c	module: ensure that kobject_put() is safe for module type kobjects	2025-05-18 08:24:54 +02:00
pid_namespace.c
pid_sysctl.h
pid.c
profile.c
ptrace.c
range.c
reboot.c	Flush console log from kernel_power_off()	2025-04-20 10:15:12 +02:00
regset.c
relay.c
resource_kunit.c
resource.c	resource: fix false warning in __request_region()	2025-08-01 09:48:44 +01:00
rseq.c	rseq: Fix segfault on registration when rseq_cs is non-zero	2025-07-17 18:37:24 +02:00
scftorture.c
scs.c
seccomp.c	seccomp: passthrough uretprobe systemcall without filtering	2025-02-17 10:05:12 +01:00
signal.c	pidfs: improve multi-threaded exec and premature thread-group leader exit polling	2025-05-29 11:02:09 +02:00
smp.c
smpboot.c
smpboot.h
softirq.c	lockdep: Fix wait context check on softirq for PREEMPT_RT	2025-05-29 11:02:08 +02:00
stackleak.c
stacktrace.c
static_call_inline.c	x86/static-call: provide a way to do very early static-call updates	2024-12-19 18:13:23 +01:00
static_call.c
stop_machine.c	sched/core: Fix migrate_swap() vs. hotplug	2025-07-17 18:37:03 +02:00
sys_ni.c
sys.c
sysctl-test.c
sysctl.c
task_work.c
taskstats.c
torture.c
tracepoint.c
tsacct.c
ucount.c	ucount: fix atomic_long_inc_below() argument type	2025-08-15 12:13:59 +02:00
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	vhost_task: fix vhost_task_create() documentation	2025-05-29 11:01:59 +02:00
vmcore_info.c
watch_queue.c	watch_queue: fix pipe accounting mismatch	2025-04-10 14:39:10 +02:00
watchdog_buddy.c
watchdog_perf.c	watchdog/hardlockup/perf: Fix perf_event memory leak	2025-04-10 14:39:11 +02:00
watchdog.c	watchdog: fix watchdog may detect false positive of softlockup	2025-06-27 11:11:22 +01:00
workqueue_internal.h
workqueue.c	workqueue: Initialize wq_isolated_cpumask in workqueue_init_early()	2025-06-27 11:11:42 +01:00