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linux-stable/kernel
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Linus Torvalds 3cd139875e sched/membarrier: reduce the ability to hammer on sys_membarrier 
commit 944d5fe50f3f03daacfea16300e656a1691c4a23 upstream.

On some systems, sys_membarrier can be very expensive, causing overall
slowdowns for everything.  So put a lock on the path in order to
serialize the accesses to prevent the ability for this to be called at
too high of a frequency and saturate the machine.

Reviewed-and-tested-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Acked-by: Borislav Petkov <bp@alien8.de>
Fixes: 22e4ebb97582 ("membarrier: Provide expedited private command")
Fixes: c5f58bd58f43 ("membarrier: Provide GLOBAL_EXPEDITED command")
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
[ converted to explicit mutex_*() calls - cleanup.h is not in this stable
  branch - gregkh ]
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2024-02-23 08:12:58 +01:00
..
bpf
bpf: Add map and need_defer parameters to .map_fd_put_ptr()
2024-02-23 08:12:46 +01:00
cgroup
cgroup: Remove duplicates in cgroup v1 tasks file
2023-10-25 11:16:34 +02:00
configs
kconfig: tinyconfig: remove stale stack protector fixups
2018-06-15 07:15:28 +09:00
debug
kdb: Fix a potential buffer overflow in kdb_local()
2024-01-25 14:33:39 -08:00
dma
dma-mapping: clear dev->dma_mem to NULL after freeing it
2024-01-25 14:33:34 -08:00
events
perf: Fix perf_event_validate_size() lockdep splat
2023-12-20 15:38:03 +01:00
gcov
gcov: add support for checksum field
2023-01-18 11:30:39 +01:00
irq
genirq/generic_chip: Make irq_remove_generic_chip() irqdomain aware
2023-11-28 16:46:34 +00:00
livepatch
livepatch: fix race between fork and KLP transition
2022-10-26 13:19:23 +02:00
locking
locking/ww_mutex/test: Fix potential workqueue corruption
2023-11-28 16:46:30 +00:00
power
PM: hibernate: Enforce ordering during image compression/decompression
2024-02-23 08:12:39 +01:00
printk
printk: fix return value of printk.devkmsg __setup handler
2022-04-15 14:14:45 +02:00
rcu
rcu: Suppress smp_processor_id() complaint in synchronize_rcu_expedited_wait()
2023-03-11 16:31:45 +01:00
sched
sched/membarrier: reduce the ability to hammer on sys_membarrier
2024-02-23 08:12:58 +01:00
time
hrtimer: Report offline hrtimer enqueue
2024-02-23 08:12:55 +01:00
trace
ring-buffer: Clean ring_buffer_poll_wait() error return
2024-02-23 08:12:57 +01:00
.gitignore
…
acct.c
acct: fix potential integer overflow in encode_comp_t()
2023-01-18 11:30:34 +01:00
async.c
treewide: Remove uninitialized_var() usage
2023-08-11 11:45:01 +02:00
audit_fsnotify.c
audit: fix potential double free on error path from fsnotify_add_inode_mark
2022-09-05 10:26:28 +02:00
audit_tree.c
audit: Embed key into chunk
2019-12-13 08:51:11 +01:00
audit_watch.c
audit: don't WARN_ON_ONCE(!current->mm) in audit_exe_compare()
2023-11-28 16:46:34 +00:00
audit.c
audit: Send netlink ACK before setting connection in auditd_set
2024-02-23 08:12:44 +01:00
audit.h
audit: fix a net reference leak in audit_list_rules_send()
2020-06-22 09:05:13 +02:00
auditfilter.c
audit: fix a net reference leak in audit_list_rules_send()
2020-06-22 09:05:13 +02:00
auditsc.c
audit: fix possible soft lockup in __audit_inode_child()
2023-09-23 10:48:04 +02:00
backtracetest.c
…
bounds.c
kbuild: fix kernel/bounds.c 'W=1' warning
2018-11-13 11:08:47 -08:00
capability.c
LSM: generalize flag passing to security_capable
2020-01-23 08:21:29 +01:00
compat.c
sched_getaffinity: don't assume 'cpumask_size()' is fully initialized
2023-04-05 11:15:39 +02:00
configs.c
…
context_tracking.c
…
cpu_pm.c
kernel/cpu_pm: Fix uninitted local in cpu_pm
2020-06-22 09:05:28 +02:00
cpu.c
hrtimers: Push pending hrtimers away from outgoing CPU earlier
2023-12-13 17:42:15 +01:00
crash_core.c
kernel/crash_core.c: print timestamp using time64_t
2018-08-22 10:52:47 -07:00
crash_dump.c
…
cred.c
cred: switch to using atomic_long_t
2023-12-20 15:38:01 +01:00
delayacct.c
…
dma.c
proc: introduce proc_create_single{,_data}
2018-05-16 07:23:35 +02:00
exec_domain.c
proc: introduce proc_create_single{,_data}
2018-05-16 07:23:35 +02:00
exit.c
treewide: Remove uninitialized_var() usage
2023-08-11 11:45:01 +02:00
extable.c
kernel/extable.c: use address-of operator on section symbols
2023-06-09 10:24:02 +02:00
fail_function.c
fail_function: Remove a redundant mutex unlock
2020-11-24 13:27:23 +01:00
fork.c
mm/hugetlb: initialize hugetlb_usage in mm_init
2021-09-22 11:48:09 +02:00
freezer.c
PM / reboot: Eliminate race between reboot and suspend
2018-08-06 12:35:20 +02:00
futex.c
treewide: Remove uninitialized_var() usage
2023-08-11 11:45:01 +02:00
groups.c
…
hung_task.c
kernel: hung_task.c: disable on suspend
2019-04-20 09:16:02 +02:00
iomem.c
memremap: split devm_memremap_pages() and memremap() infrastructure
2018-05-15 23:08:33 -07:00
irq_work.c
irq_work: Do not raise an IPI when queueing work on the local CPU
2019-05-31 06:46:19 -07:00
jump_label.c
locking/static_key: Fix false positive warnings on concurrent dec/inc
2021-03-04 09:39:30 +01:00
kallsyms.c
kallsyms: Refactor kallsyms_show_value() to take cred
2020-07-16 08:17:26 +02:00
kcmp.c
…
Kconfig.freezer
…
Kconfig.hz
…
Kconfig.locks
…
Kconfig.preempt
kconfig: include kernel/Kconfig.preempt from init/Kconfig
2018-08-02 08:06:54 +09:00
kcov.c
kernel/kcov.c: mark write_comp_data() as notrace
2019-02-12 19:47:20 +01:00
kexec_core.c
kexec: fix a memory leak in crash_shrink_memory()
2023-08-11 11:45:06 +02:00
kexec_file.c
kexec: support purgatories with .text.hot sections
2023-06-21 15:39:57 +02:00
kexec_internal.h
…
kexec.c
kexec: add call to LSM hook in original kexec_load syscall
2018-07-16 12:31:57 -07:00
kmod.c
kmod: make request_module() return an error when autoloading is disabled
2020-04-17 10:48:52 +02:00
kprobes.c
x86/kprobes: Fix arch_check_optimized_kprobe check within optimized_kprobe range
2023-03-11 16:31:51 +01:00
ksysfs.c
…
kthread.c
kthread: prevent deadlock when kthread_mod_delayed_work() races with kthread_cancel_delayed_work_sync()
2021-07-11 12:49:31 +02:00
latencytop.c
…
Makefile
elfcore: fix building with clang
2021-02-10 09:21:06 +01:00
memremap.c
mm/memory_hotplug: shrink zones when offlining memory
2020-01-29 16:43:27 +01:00
module_signing.c
modsign: log module name in the event of an error
2018-07-02 11:36:17 +02:00
module-internal.h
modsign: log module name in the event of an error
2018-07-02 11:36:17 +02:00
module.c
modules: only allow symbol_get of EXPORT_SYMBOL_GPL modules
2023-09-23 10:47:56 +02:00
notifier.c
x86/mm: split vmalloc_sync_all()
2020-03-25 08:06:13 +01:00
nsproxy.c
…
padata.c
crypto: pcrypt - Fix hungtask for PADATA_RESET
2023-11-28 16:46:31 +00:00
panic.c
exit: Use READ_ONCE() for all oops/warn limit reads
2023-02-06 07:49:46 +01:00
params.c
…
pid_namespace.c
memcg: enable accounting for pids in nested pid namespaces
2021-09-22 11:48:09 +02:00
pid.c
Fix failure path in alloc_pid()
2019-01-13 09:51:06 +01:00
profile.c
profiling: fix shift too large makes kernel panic
2022-08-25 11:15:20 +02:00
ptrace.c
ptrace: Reimplement PTRACE_KILL by always sending SIGKILL
2022-06-14 16:59:14 +02:00
range.c
…
reboot.c
reboot: fix overflow parsing reboot cpu number
2020-11-18 19:18:52 +01:00
relay.c
relayfs: fix out-of-bounds access in relay_file_read
2023-05-17 11:13:23 +02:00
resource.c
resource: fix locking in find_next_iomem_res()
2019-09-16 08:22:20 +02:00
rseq.c
rseq: uapi: Declare rseq_cs field as union, update includes
2018-07-10 22:18:52 +02:00
seccomp.c
seccomp: Invalidate seccomp mode to catch death failures
2022-02-16 12:51:47 +01:00
signal.c
signal handling: don't use BUG_ON() for debugging
2022-07-21 21:09:32 +02:00
smp.c
smp: Fix offline cpu check in flush_smp_call_function_queue()
2022-04-20 09:12:50 +02:00
smpboot.c
kthread: Extract KTHREAD_IS_PER_CPU
2021-02-07 14:48:38 +01:00
smpboot.h
…
softirq.c
nohz: Fix missing tick reprogram when interrupting an inline softirq
2018-08-03 15:52:10 +02:00
stacktrace.c
…
stop_machine.c
Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2018-08-13 11:25:07 -07:00
sys_ni.c
kernel/sys_ni: add compat entry for fadvise64_64
2022-09-05 10:26:28 +02:00
sys.c
prlimit: do_prlimit needs to have a speculation check
2023-01-24 07:11:49 +01:00
sysctl_binary.c
…
sysctl.c
proc: proc_skip_spaces() shouldn't think it is working on C strings
2022-12-08 11:18:32 +01:00
task_work.c
…
taskstats.c
taskstats: fix data-race
2020-01-09 10:18:59 +01:00
test_kprobes.c
kprobes: Remove jprobe API implementation
2018-06-21 12:33:05 +02:00
torture.c
torture: Keep old-school dmesg format
2018-06-25 11:30:10 -07:00
tracepoint.c
tracepoint: Add tracepoint_probe_register_may_exist() for BPF tracing
2021-07-20 16:15:42 +02:00
tsacct.c
taskstats: Cleanup the use of task->exit_code
2022-02-23 11:58:39 +01:00
ucount.c
…
uid16.c
…
uid16.h
…
umh.c
usermodehelper: reset umask to default before executing user process
2020-10-14 10:31:21 +02:00
up.c
smp: Fix smp_call_function_single_async prototype
2021-05-22 10:59:39 +02:00
user_namespace.c
userns: also map extents in the reverse map to kernel IDs
2018-11-13 11:09:00 -08:00
user-return-notifier.c
…
user.c
userns: use irqsave variant of refcount_dec_and_lock()
2018-08-22 10:52:47 -07:00
utsname_sysctl.c
sys: don't hold uts_sem while accessing userspace memory
2018-08-11 02:05:53 -05:00
utsname.c
…
watchdog_hld.c
watchdog/perf: more properly prevent false positives with turbo modes
2023-08-11 11:45:06 +02:00
watchdog.c
watchdog: export lockup_detector_reconfigure
2022-08-25 11:15:46 +02:00
workqueue_internal.h
workqueue: Set worker->desc to workqueue name by default
2018-05-18 08:47:13 -07:00
workqueue.c
workqueue: Override implicit ordered attribute in workqueue_apply_unbound_cpumask()
2023-10-25 11:16:26 +02:00