linux-yocto/kernel
Michal Koutný 1e53f83deb cgroup: Add compatibility option for content of /proc/cgroups
[ Upstream commit 646faf36d7 ]

/proc/cgroups lists only v1 controllers by default, however, this is
only enforced since the commit af000ce852 ("cgroup: Do not report
unavailable v1 controllers in /proc/cgroups") and there is software in
the wild that uses content of /proc/cgroups to decide on availability of
v2 (sic) controllers.

Add a boottime param that can bring back the previous behavior for
setups where the check in the software cannot be changed and it causes
e.g. unintended OOMs.

Also, this patch takes out cgrp_v1_visible from cgroup1_subsys_absent()
guard since it's only important to check which hierarchy (v1 vs v2) the
subsys is attached to. This has no effect on the printed message but
the code is cleaner since cgrp_v1_visible is really about mounted
hierarchies, not the content of /proc/cgroups.

Link: https://lore.kernel.org/r/b26b60b7d0d2a5ecfd2f3c45f95f32922ed24686.camel@decadent.org.uk
Fixes: af000ce852 ("cgroup: Do not report unavailable v1 controllers in /proc/cgroups")
Fixes: a0ab145322 ("cgroup: Print message when /proc/cgroups is read on v2-only system")
Signed-off-by: Michal Koutný <mkoutny@suse.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2025-08-15 16:39:10 +02:00
..
bpf bpf/preload: Don't select USERMODE_DRIVER 2025-08-15 16:38:56 +02:00
cgroup cgroup: Add compatibility option for content of /proc/cgroups 2025-08-15 16:39:10 +02:00
configs Kbuild updates for v6.16 2025-06-07 10:05:35 -07:00
debug TTY/Serial driver updates for 6.15-rc1 2025-04-02 18:17:33 -07:00
dma dma-contiguous: hornor the cma address limit setup by user 2025-06-12 08:38:40 +02:00
entry entry: Inline syscall_exit_to_user_mode() 2025-04-29 08:27:10 +02:00
events perf/core: Fix WARN in perf_sigtrap() 2025-07-09 13:40:17 +02:00
futex futex: Verify under the lock if hash can be replaced 2025-06-11 17:24:09 +02:00
gcov kbuild: require gcc-8 and binutils-2.30 2025-04-30 21:53:35 +02:00
irq genirq/irq_sim: Initialize work context pointers properly 2025-06-13 15:36:35 +02:00
kcsan kcsan: test: Initialize dummy variable 2025-08-15 16:38:50 +02:00
livepatch sched,livepatch: Untangle cond_resched() and live-patching 2025-05-14 13:16:24 +02:00
locking Generic: 2025-06-02 12:24:58 -07:00
module audit,module: restore audit logging in load failure case 2025-08-15 16:38:20 +02:00
power PM: suspend: clean up redundant filesystems_freeze/thaw() handling 2025-07-15 14:55:00 +02:00
printk printk changes for 6.15 2025-03-27 19:22:24 -07:00
rcu rcu: Fix delayed execution of hurry callbacks 2025-08-15 16:38:49 +02:00
sched sched/deadline: Reset extra_bw to max_bw when clearing root domains 2025-08-15 16:38:46 +02:00
time timekeeping: Zero initialize system_counterval when querying time from phc drivers 2025-07-22 14:25:21 +02:00
trace kernel: trace: preemptirq_delay_test: use offstack cpu mask 2025-08-15 16:39:06 +02:00
.gitignore
acct.c acct: block access to kernel internal filesystems 2025-02-12 12:24:16 +01:00
async.c
audit_fsnotify.c
audit_tree.c replace collect_mounts()/drop_collected_mounts() with a safer variant 2025-06-23 14:01:49 -04:00
audit_watch.c fs: add kern_path_locked_negative() 2025-04-15 11:32:34 +02:00
audit.c audit: record AUDIT_ANOM_* events regardless of presence of rules 2025-04-11 14:14:41 -04:00
audit.h audit,module: restore audit logging in load failure case 2025-08-15 16:38:20 +02:00
auditfilter.c audit: fix suffixed '/' filename matching 2024-12-05 19:22:38 -05:00
auditsc.c audit,module: restore audit logging in load failure case 2025-08-15 16:38:20 +02:00
backtracetest.c
bounds.c
capability.c capability: Remove unused has_capability 2025-03-07 22:03:09 -06:00
cfi.c Modules changes for 6.15-rc1 2025-03-30 15:44:36 -07:00
compat.c
configs.c
context_tracking.c context_tracking: Make RCU watch ct_kernel_exit_state() warning 2025-03-04 18:44:29 -08:00
cpu_pm.c
cpu.c perf: Remove too early and redundant CPU hotplug handling 2025-05-08 21:50:19 +02:00
crash_core.c crash: Use note name macros 2025-02-10 16:56:58 -08:00
crash_dump_dm_crypt.c crash_dump: retrieve dm crypt keys in kdump kernel 2025-05-21 10:48:21 -07:00
crash_reserve.c crash: fix spelling mistake "crahskernel" -> "crashkernel" 2025-05-11 17:54:10 -07:00
cred.c cred: remove old {override,revert}_creds() helpers 2024-12-02 11:25:09 +01:00
delayacct.c delayacct: remove redundant code and adjust indentation 2025-05-27 19:40:33 -07:00
dma.c
elfcorehdr.c
exec_domain.c
exit.c - Avoid a crash on a heterogeneous machine where not all cores support the 2025-06-22 10:11:45 -07:00
exit.h
extable.c
fail_function.c
fork.c - The 11 patch series "Add folio_mk_pte()" from Matthew Wilcox 2025-05-31 15:44:16 -07:00
freezer.c sched,freezer: Remove unnecessary warning in __thaw_task 2025-07-17 07:56:50 -10:00
gen_kheaders.sh Revert "kheaders: Ignore silly-rename files" 2025-03-15 21:22:52 +09:00
groups.c
hung_task.c hung_task: show the blocker task if the task is hung on semaphore 2025-05-11 17:54:08 -07:00
iomem.c mm/memremap: Pass down MEMREMAP_* flags to arch_memremap_wb() 2025-02-21 15:05:38 +01:00
irq_work.c kasan: make kasan_record_aux_stack_noalloc() the default behaviour 2025-01-13 22:40:36 -08:00
jump_label.c jump_label: Use RCU in all users of __module_text_address(). 2025-03-10 11:54:46 +01:00
kallsyms_internal.h
kallsyms_selftest.c kallsyms: Use kthread_run_on_cpu() 2025-01-02 22:12:12 +01:00
kallsyms_selftest.h
kallsyms.c kallsyms: Remove KALLSYMS_ABSOLUTE_PERCPU 2025-02-18 10:16:04 +01:00
kcmp.c kcmp: improve performance adding an unlikely hint to task comparisons 2025-02-21 10:25:33 +01:00
Kconfig.freezer
Kconfig.hz kernel: Fix "select" wording on HZ_250 description 2025-02-21 09:20:30 +01:00
Kconfig.kexec crashdump: add CONFIG_KEYS dependency 2025-06-25 15:55:04 -07:00
Kconfig.locks
Kconfig.preempt sched: No PREEMPT_RT=y for all{yes,mod}config 2024-11-07 15:25:05 +01:00
kcov.c kcov: mark in_softirq_really() as __always_inline 2024-12-30 17:59:08 -08:00
kexec_core.c kexec_core: Fix error code path in the KEXEC_JUMP flow 2025-08-15 16:38:34 +02:00
kexec_elf.c kexec: initialize ELF lowest address to ULONG_MAX 2025-03-16 22:30:47 -07:00
kexec_file.c - The 3 patch series "hung_task: extend blocking task stacktrace dump to 2025-05-31 19:12:53 -07:00
kexec_handover.c kho: initialize tail pages for higher order folios properly 2025-06-19 20:48:02 -07:00
kexec_internal.h kexec: add KHO support to kexec file loads 2025-05-12 23:50:40 -07:00
kexec.c
kheaders.c kheaders: Simplify attribute through __BIN_ATTR_SIMPLE_RO() 2024-12-24 09:46:49 +01:00
kprobes.c kprobes: Use RCU in all users of __module_text_address(). 2025-03-10 11:54:46 +01:00
ksyms_common.c
ksysfs.c kernel/ksysfs.c: simplify bin_attribute definition 2025-01-07 16:59:15 +01:00
kthread.c treewide, timers: Rename from_timer() to timer_container_of() 2025-06-08 09:07:37 +02:00
latencytop.c treewide: const qualify ctl_tables where applicable 2025-01-28 13:48:37 +01:00
Makefile - The 3 patch series "hung_task: extend blocking task stacktrace dump to 2025-05-31 19:12:53 -07:00
module_signature.c
notifier.c reboot: move reboot_notifier_list to kernel/reboot.c 2024-11-05 17:12:31 -08:00
nsproxy.c kernel/nsproxy: remove unnecessary guards 2025-05-09 13:13:54 +02:00
padata.c padata: Fix pd UAF once and for all 2025-08-15 16:38:58 +02:00
panic.c - The 3 patch series "hung_task: extend blocking task stacktrace dump to 2025-05-31 19:12:53 -07:00
params.c module: ensure that kobject_put() is safe for module type kobjects 2025-05-07 20:24:59 +02:00
pid_namespace.c pid: Do not set pid_max in new pid namespaces 2025-03-06 10:18:36 +01:00
pid_sysctl.h treewide: const qualify ctl_tables where applicable 2025-01-28 13:48:37 +01:00
pid.c pidfs: detect refcount bugs 2025-05-06 13:59:00 +02:00
profile.c
ptrace.c ptrace: introduce PTRACE_SET_SYSCALL_INFO request 2025-05-11 17:48:15 -07:00
range.c
reboot.c - The 7 patch series "powerpc/crash: use generic crashkernel 2025-04-01 10:06:52 -07:00
regset.c
relay.c relay: remove unused relay_late_setup_files 2025-05-11 17:54:09 -07:00
resource_kunit.c
resource.c resource: fix false warning in __request_region() 2025-07-24 17:57:59 -07:00
rseq.c rseq: Fix segfault on registration when rseq_cs is non-zero 2025-03-06 22:26:49 +01:00
scftorture.c scftorture: Handle NULL argument passed to scf_add_to_free_list(). 2024-11-14 16:09:51 -08:00
scs.c
seccomp.c seccomp: avoid the lock trip seccomp_filter_release in common case 2025-02-24 11:17:10 -08:00
signal.c signal: Move signal ctl tables into signal.c 2025-04-09 13:32:16 +02:00
smp.c CSD-lock pull request for v6.14 2025-01-28 11:34:03 -08:00
smpboot.c
smpboot.h
softirq.c lockdep: Fix wait context check on softirq for PREEMPT_RT 2025-03-25 10:46:44 +01:00
stackleak.c treewide: const qualify ctl_tables where applicable 2025-01-28 13:48:37 +01:00
stacktrace.c
static_call_inline.c Modules changes for 6.15-rc1 2025-03-30 15:44:36 -07:00
static_call.c
stop_machine.c sched/core: Fix migrate_swap() vs. hotplug 2025-07-01 15:02:03 +02:00
sys_ni.c
sys.c futex: Add basic infrastructure for local task local hash 2025-05-03 12:02:07 +02:00
sysctl-test.c sysctl: move u8 register test to lib/test_sysctl.c 2025-04-14 14:13:41 +02:00
sysctl.c sparc: mv sparc sysctls into their own file under arch/sparc/kernel 2025-04-09 13:32:16 +02:00
task_work.c kasan: make kasan_record_aux_stack_noalloc() the default behaviour 2025-01-13 22:40:36 -08:00
taskstats.c fdget(), more trivial conversions 2024-11-03 01:28:06 -05:00
torture.c torture: Add get_torture_init_jiffies() for test-start time 2025-02-05 07:14:24 -08:00
tracepoint.c tracepoint: Print the function symbol when tracepoint_debug is set 2025-03-21 15:30:10 -04:00
tsacct.c
ucount.c ucount: use rcuref_t for reference counting 2025-03-16 22:30:50 -07:00
uid16.c
uid16.h
umh.c treewide: const qualify ctl_tables where applicable 2025-01-28 13:48:37 +01:00
up.c
user_namespace.c uidgid: add map_id_range_up() 2025-02-12 12:12:27 +01:00
user-return-notifier.c
user.c
usermode_driver.c
utsname_sysctl.c treewide: const qualify ctl_tables where applicable 2025-01-28 13:48:37 +01:00
utsname.c
vhost_task.c vhost_task: fix vhost_task_create() documentation 2025-04-18 10:08:11 -04:00
vmcore_info.c crash: export PAGE_UNACCEPTED_MAPCOUNT_VALUE to vmcoreinfo 2025-05-11 17:54:04 -07:00
watch_queue.c vfs-6.15-rc1.pipe 2025-03-24 09:52:37 -07:00
watchdog_buddy.c
watchdog_perf.c - The 7 patch series "powerpc/crash: use generic crashkernel 2025-04-01 10:06:52 -07:00
watchdog.c kernel/watchdog: add /sys/kernel/{hard,soft}lockup_count 2025-05-21 10:48:22 -07:00
workqueue_internal.h
workqueue.c workqueue: Initialize wq_isolated_cpumask in workqueue_init_early() 2025-06-17 08:58:29 -10:00