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Zheng Yejian d93e05a521 ring-buffer: Avoid softlockup in ring_buffer_resize() 
[ Upstream commit f6bd2c92488c30ef53b5bd80c52f0a7eee9d545a ]

When user resize all trace ring buffer through file 'buffer_size_kb',
then in ring_buffer_resize(), kernel allocates buffer pages for each
cpu in a loop.

If the kernel preemption model is PREEMPT_NONE and there are many cpus
and there are many buffer pages to be allocated, it may not give up cpu
for a long time and finally cause a softlockup.

To avoid it, call cond_resched() after each cpu buffer allocation.

Link: https://lore.kernel.org/linux-trace-kernel/20230906081930.3939106-1-zhengyejian1@huawei.com

Cc: <mhiramat@kernel.org>
Signed-off-by: Zheng Yejian <zhengyejian1@huawei.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2023-10-10 21:44:58 +02:00
..
bpf
bpf: Address KCSAN report on bpf_lru_list
2023-08-11 11:45:25 +02:00
cgroup
cgroup:namespace: Remove unused cgroup_namespaces_init()
2023-09-23 10:48:08 +02:00
configs
…
debug
kdb: Make memory allocations more robust
2021-03-04 09:39:31 +01:00
dma
treewide: Remove uninitialized_var() usage
2023-08-11 11:45:01 +02:00
events
perf: Fix function pointer case
2023-08-11 11:45:36 +02:00
gcov
gcov: add support for checksum field
2023-01-18 11:30:39 +01:00
irq
irqdomain: Drop bogus fwspec-mapping error handling
2023-03-11 16:31:52 +01:00
livepatch
livepatch: fix race between fork and KLP transition
2022-10-26 13:19:23 +02:00
locking
treewide: Remove uninitialized_var() usage
2023-08-11 11:45:01 +02:00
power
PM: hibernate: Allow hybrid sleep to work with s2idle
2022-11-03 23:52:31 +09:00
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/rt: pick_next_rt_entity(): check list_entry
2023-08-30 16:31:56 +02:00
time
posix-timers: Ensure timer ID search-loop limit is valid
2023-08-11 11:45:25 +02:00
trace
ring-buffer: Avoid softlockup in ring_buffer_resize()
2023-10-10 21:44:58 +02:00
.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: CONFIG_CHANGE don't log internal bookkeeping as an event
2020-10-01 13:14:33 +02:00
audit.c
treewide: Remove uninitialized_var() usage
2023-08-11 11:45:01 +02:00
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
random: clear fast pool, crng, and batches in cpuhp bring up
2022-06-25 11:49:07 +02:00
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
memcg: account security cred as well to kmemcg
2020-01-09 10:19:00 +01:00
delayacct.c
…
dma.c
…
exec_domain.c
…
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
…
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
padata: add separate cpuhp node for CPUHP_PADATA_DEAD
2021-08-08 08:54:30 +02:00
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
…
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.c
workqueue: clean up WORK_* constant types, clarify masking
2023-08-11 11:45:17 +02:00