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linux/kernel
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Linus Torvalds 50fb4e17df 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 08:55:14 +01:00
..
bpf
bpf: Set uattr->batch.count as zero before batched update or deletion
2024-02-23 08:54:42 +01:00
cgroup
cgroup: Remove duplicates in cgroup v1 tasks file
2023-10-19 23:05:37 +02:00
configs
drivers/char: remove /dev/kmem for good
2021-05-07 00:26:34 -07:00
debug
kdb: Fix a potential buffer overflow in kdb_local()
2024-01-25 14:52:54 -08:00
dma
dma-mapping: clear dev->dma_mem to NULL after freeing it
2024-01-25 14:52:38 -08:00
entry
entry/rcu: Check TIF_RESCHED _after_ delayed RCU wake-up
2023-03-30 12:47:51 +02:00
events
perf: Fix the nr_addr_filters fix
2024-02-23 08:54:52 +01:00
futex
futex: Don't include process MM in futex key on no-MMU
2023-11-20 11:08:13 +01:00
gcov
gcov: add support for checksum field
2022-12-31 13:14:47 +01:00
irq
genirq/generic_chip: Make irq_remove_generic_chip() irqdomain aware
2023-11-28 16:56:30 +00:00
kcsan
kcsan: Don't expect 64 bits atomic builtins from 32 bits architectures
2023-07-23 13:47:12 +02:00
livepatch
livepatch: Fix missing newline character in klp_resolve_symbols()
2023-11-20 11:08:25 +01:00
locking
lockdep: Fix block chain corruption
2023-12-03 07:31:23 +01:00
power
PM: hibernate: Enforce ordering during image compression/decompression
2024-02-23 08:54:23 +01:00
printk
printk: Consolidate console deferred printing
2023-09-23 11:09:59 +02:00
rcu
rcu: Avoid tracing a few functions executed in stop machine
2023-12-08 08:48:02 +01:00
sched
sched/membarrier: reduce the ability to hammer on sys_membarrier
2024-02-23 08:55:14 +01:00
time
hrtimer: Ignore slack time for RT tasks in schedule_hrtimeout_range()
2024-02-23 08:55:14 +01:00
trace
tracing: Inform kmemleak of saved_cmdlines allocation
2024-02-23 08:55:10 +01:00
.gitignore
.gitignore: prefix local generated files with a slash
2021-05-02 00:43:35 +09:00
acct.c
acct: fix potential integer overflow in encode_comp_t()
2022-12-31 13:14:40 +01:00
async.c
async: Introduce async_schedule_dev_nocall()
2024-02-23 08:54:25 +01:00
audit_fsnotify.c
audit: fix potential double free on error path from fsnotify_add_inode_mark
2022-08-31 17:16:33 +02:00
audit_tree.c
audit: move put_tree() to avoid trim_trees refcount underflow and UAF
2021-08-24 18:52:36 -04:00
audit_watch.c
audit: don't WARN_ON_ONCE(!current->mm) in audit_exe_compare()
2023-11-28 16:56:27 +00:00
audit.c
audit: Send netlink ACK before setting connection in auditd_set
2024-02-23 08:54:37 +01:00
audit.h
audit: log AUDIT_TIME_* records only from rules
2022-04-08 14:23:06 +02:00
auditfilter.c
…
auditsc.c
audit: fix possible soft lockup in __audit_inode_child()
2023-09-19 12:22:39 +02:00
backtracetest.c
…
bounds.c
…
capability.c
…
cfi.c
cfi: Fix __cfi_slowpath_diag RCU usage with cpuidle
2022-06-22 14:22:04 +02:00
compat.c
sched_getaffinity: don't assume 'cpumask_size()' is fully initialized
2023-04-05 11:24:53 +02:00
configs.c
…
context_tracking.c
…
cpu_pm.c
PM: cpu: Make notifier chain use a raw_spinlock_t
2021-08-16 18:55:32 +02:00
cpu.c
hrtimers: Push pending hrtimers away from outgoing CPU earlier
2023-12-13 18:36:31 +01:00
crash_core.c
kernel/crash_core: suppress unknown crashkernel parameter warning
2021-12-29 12:28:49 +01:00
crash_dump.c
…
cred.c
cred: switch to using atomic_long_t
2023-12-20 15:17:37 +01:00
delayacct.c
delayacct: Add sysctl to enable at runtime
2021-05-12 11:43:25 +02:00
dma.c
…
exec_domain.c
…
exit.c
exit: Use READ_ONCE() for all oops/warn limit reads
2023-02-01 08:27:22 +01:00
extable.c
…
fail_function.c
kernel/fail_function: fix memory leak with using debugfs_lookup()
2023-03-11 13:57:38 +01:00
fork.c
kernel/fork: beware of __put_task_struct() calling context
2023-09-23 11:09:55 +02:00
freezer.c
sched: Add get_current_state()
2021-06-18 11:43:08 +02:00
gen_kheaders.sh
kbuild: clean up ${quiet} checks in shell scripts
2021-05-27 04:01:50 +09:00
groups.c
…
hung_task.c
Merge branch 'akpm' (patches from Andrew)
2021-07-02 12:08:10 -07:00
iomem.c
…
irq_work.c
irq_work: Make irq_work_queue() NMI-safe again
2021-06-10 10:00:08 +02:00
jump_label.c
jump_label: Fix jump_label_text_reserved() vs __init
2021-07-05 10:46:20 +02:00
kallsyms.c
kallsyms: Make kallsyms_on_each_symbol generally available
2023-12-13 18:36:45 +01:00
kcmp.c
…
Kconfig.freezer
…
Kconfig.hz
…
Kconfig.locks
locking/rwlock: Provide RT variant
2021-08-17 17:50:51 +02:00
Kconfig.preempt
sched/core: Disable CONFIG_SCHED_CORE by default
2021-06-28 22:43:05 +02:00
kcov.c
…
kexec_core.c
kexec: fix a memory leak in crash_shrink_memory()
2023-07-23 13:46:52 +02:00
kexec_elf.c
…
kexec_file.c
kexec: support purgatories with .text.hot sections
2023-06-21 15:59:14 +02:00
kexec_internal.h
panic, kexec: make __crash_kexec() NMI safe
2023-04-20 12:13:57 +02:00
kexec.c
kernel: kexec: copy user-array safely
2023-11-28 16:56:16 +00:00
kheaders.c
kheaders: Use array declaration instead of char
2023-05-11 23:00:17 +09:00
kmod.c
modules: add CONFIG_MODPROBE_PATH
2021-05-07 00:26:33 -07:00
kprobes.c
kprobes: Fix to handle forcibly unoptimized kprobes on freeing_list
2024-01-25 14:52:31 -08:00
ksysfs.c
kexec: turn all kexec_mutex acquisitions into trylocks
2023-04-20 12:13:57 +02:00
kthread.c
kthread: add the helper function kthread_run_on_cpu()
2023-03-30 12:47:42 +02:00
latencytop.c
…
Makefile
futex: Move to kernel/futex/
2022-12-31 13:14:04 +01:00
module_signature.c
…
module_signing.c
…
module-internal.h
…
module.c
kallsyms: Make module_kallsyms_on_each_symbol generally available
2024-01-15 18:51:26 +01:00
notifier.c
notifier: Remove atomic_notifier_call_chain_robust()
2021-08-16 18:55:32 +02:00
nsproxy.c
memcg: enable accounting for new namesapces and struct nsproxy
2021-09-03 09:58:12 -07:00
padata.c
crypto: pcrypt - Fix hungtask for PADATA_RESET
2023-11-28 16:56:18 +00:00
panic.c
exit: Use READ_ONCE() for all oops/warn limit reads
2023-02-01 08:27:22 +01:00
params.c
params: lift param_set_uint_minmax to common code
2021-08-16 14:42:22 +02:00
pid_namespace.c
rcu-tasks: Fix synchronize_rcu_tasks() VS zap_pid_ns_processes()
2023-03-10 09:39:09 +01:00
pid.c
kernel/pid.c: implement additional checks upon pidfd_create() parameters
2021-08-10 12:53:07 +02:00
profile.c
profiling: fix shift too large makes kernel panic
2022-08-17 14:24:04 +02:00
ptrace.c
ptrace: Reimplement PTRACE_KILL by always sending SIGKILL
2022-06-09 10:22:29 +02:00
range.c
…
reboot.c
kernel/reboot: emergency_restart: Set correct system_state
2023-11-28 16:56:31 +00:00
regset.c
…
relay.c
relayfs: fix out-of-bounds access in relay_file_read
2023-05-11 23:00:18 +09:00
resource_kunit.c
…
resource.c
dax/kmem: Fix leak of memory-hotplug resources
2023-03-10 09:40:08 +01:00
rseq.c
rseq: Remove broken uapi field layout on 32-bit little endian
2022-04-08 14:23:10 +02:00
scftorture.c
scftorture: Forgive memory-allocation failure if KASAN
2023-09-23 11:09:55 +02:00
scs.c
scs: Release kasan vmalloc poison in scs_free process
2021-11-18 19:16:29 +01:00
seccomp.c
seccomp: Invalidate seccomp mode to catch death failures
2022-02-16 12:56:38 +01:00
signal.c
signal handling: don't use BUG_ON() for debugging
2022-07-21 21:24:42 +02:00
smp.c
locking/csd_lock: Change csdlock_debug from early_param to __setup
2022-08-17 14:24:24 +02:00
smpboot.c
smpboot: Replace deprecated CPU-hotplug functions.
2021-08-10 14:57:42 +02:00
smpboot.h
…
softirq.c
timers/nohz: Last resort update jiffies on nohz_full IRQ entry
2023-08-16 18:22:04 +02:00
stackleak.c
gcc-plugins/stackleak: Use noinstr in favor of notrace
2022-02-23 12:03:07 +01:00
stacktrace.c
stacktrace: move filter_irq_stacks() to kernel/stacktrace.c
2022-04-13 20:59:28 +02:00
static_call_inline.c
static_call: Don't make __static_call_return0 static
2022-04-13 20:59:28 +02:00
static_call.c
static_call: Don't make __static_call_return0 static
2022-04-13 20:59:28 +02:00
stop_machine.c
…
sys_ni.c
kernel/sys_ni: add compat entry for fadvise64_64
2022-08-31 17:16:33 +02:00
sys.c
kernel/sys.c: fix and improve control flow in __sys_setres[ug]id()
2023-04-26 13:51:52 +02:00
sysctl-test.c
kernel/sysctl-test: Remove some casts which are no-longer required
2021-06-23 16:41:24 -06:00
sysctl.c
kernel/panic: move panic sysctls to its own file
2023-02-01 08:27:20 +01:00
task_work.c
kasan: record task_work_add() call stack
2021-04-30 11:20:42 -07:00
taskstats.c
…
test_kprobes.c
…
torture.c
torture: Fix hang during kthread shutdown phase
2023-08-30 16:18:19 +02:00
tracepoint.c
tracepoint: Fix kerneldoc comments
2021-08-16 11:39:51 -04:00
tsacct.c
taskstats: Cleanup the use of task->exit_code
2022-01-27 11:05:35 +01:00
ucount.c
ucounts: Handle wrapping in is_ucounts_overlimit
2022-02-23 12:03:20 +01:00
uid16.c
…
uid16.h
…
umh.c
kernel/umh.c: fix some spelling mistakes
2021-05-07 00:26:34 -07:00
up.c
A set of locking related fixes and updates:
2021-05-09 13:07:03 -07:00
user_namespace.c
ucounts: Fix systemd LimitNPROC with private users regression
2022-03-08 19:12:42 +01:00
user-return-notifier.c
…
user.c
fs/epoll: use a per-cpu counter for user's watches count
2021-09-08 11:50:27 -07:00
usermode_driver.c
Merge branch 'work.namei' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2021-07-03 11:41:14 -07:00
utsname_sysctl.c
…
utsname.c
…
watch_queue.c
kernel: watch_queue: copy user-array safely
2023-11-28 16:56:16 +00:00
watchdog_hld.c
watchdog/perf: more properly prevent false positives with turbo modes
2023-07-23 13:46:52 +02:00
watchdog.c
watchdog: move softlockup_panic back to early_param
2023-11-28 16:56:28 +00:00
workqueue_internal.h
workqueue: Assign a color to barrier work items
2021-08-17 07:49:10 -10:00
workqueue.c
Revert "workqueue: remove unused cancel_work()"
2023-12-08 08:48:03 +01:00