Rafael J. Wysocki ad3a999b8b cpufreq/sched: Explicitly synchronize limits_changed flag handling ... [ Upstream commit 79443a7e9d ] The handling of the limits_changed flag in struct sugov_policy needs to be explicitly synchronized to ensure that cpufreq policy limits updates will not be missed in some cases. Without that synchronization it is theoretically possible that the limits_changed update in sugov_should_update_freq() will be reordered with respect to the reads of the policy limits in cpufreq_driver_resolve_freq() and in that case, if the limits_changed update in sugov_limits() clobbers the one in sugov_should_update_freq(), the new policy limits may not take effect for a long time. Likewise, the limits_changed update in sugov_limits() may theoretically get reordered with respect to the updates of the policy limits in cpufreq_set_policy() and if sugov_should_update_freq() runs between them, the policy limits change may be missed. To ensure that the above situations will not take place, add memory barriers preventing the reordering in question from taking place and add READ_ONCE() and WRITE_ONCE() annotations around all of the limits_changed flag updates to prevent the compiler from messing up with that code. Fixes: 600f5badb7 ("cpufreq: schedutil: Don't skip freq update when limits change") Cc: 5.3+ <stable@vger.kernel.org> # 5.3+ Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Reviewed-by: Christian Loehle <christian.loehle@arm.com> Link: https://patch.msgid.link/3376719.44csPzL39Z@rjwysocki.net [ bw_min => bw_dl ] Signed-off-by: Sasha Levin <sashal@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2025-09-09 18:54:18 +02:00
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bpf	bpf: Fix oob access in cgroup local storage	2025-09-09 18:54:11 +02:00
cgroup	cgroup/cpuset: Use static_branch_enable_cpuslocked() on cpusets_insane_config_key	2025-08-28 16:26:17 +02:00
configs
debug
dma	dma/pool: Ensure DMA_DIRECT_REMAP allocations are decrypted	2025-09-04 15:26:30 +02:00
entry
events	perf/core: Prevent VMA split of buffer mappings	2025-08-15 12:05:11 +02:00
futex
gcov
irq
kcsan	kcsan: test: Initialize dummy variable	2025-08-15 12:04:59 +02:00
livepatch
locking
module	module: Prevent silent truncation of module name in delete_module(2)	2025-08-28 16:26:01 +02:00
power	PM: sleep: console: Fix the black screen issue	2025-08-28 16:25:53 +02:00
printk
rcu	rcu: Protect ->defer_qs_iw_pending from data race	2025-08-28 16:25:55 +02:00
sched	cpufreq/sched: Explicitly synchronize limits_changed flag handling	2025-09-09 18:54:18 +02:00
time	clocksource: Fix the CPUs' choice in the watchdog per CPU verification	2025-06-27 11:07:31 +01:00
trace	ftrace: Fix potential warning in trace_printk_seq during ftrace_dump	2025-09-04 15:26:24 +02:00
.gitignore
acct.c
async.c
audit_fsnotify.c
audit_tree.c
audit_watch.c
audit.c
audit.h
auditfilter.c
auditsc.c
backtracetest.c
bounds.c
capability.c
cfi.c
compat.c
configs.c
context_tracking.c
cpu_pm.c
cpu.c
crash_core.c
crash_dump.c
cred.c
delayacct.c
dma.c
exec_domain.c
exit.c	perf: Fix sample vs do_exit()	2025-06-27 11:07:41 +01:00
extable.c
fail_function.c
fork.c	mm: drop the assumption that VM_SHARED always implies writable	2025-08-28 16:26:12 +02:00
freezer.c
gen_kheaders.sh
groups.c
hung_task.c
iomem.c
irq_work.c
jump_label.c
kallsyms_internal.h
kallsyms.c
kcmp.c
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt
kcov.c
kexec_core.c
kexec_elf.c
kexec_file.c
kexec_internal.h
kexec.c
kheaders.c
kmod.c
kprobes.c
ksysfs.c
kthread.c
latencytop.c
Makefile
module_signature.c
notifier.c
nsproxy.c
numa.c
padata.c	padata: do not leak refcount in reorder_work	2025-06-04 14:40:20 +02:00
panic.c
params.c
pid_namespace.c
pid.c	pid: add pidfd_prepare()	2025-06-04 14:40:25 +02:00
profile.c
ptrace.c
range.c
reboot.c
regset.c
relay.c
resource_kunit.c
resource.c
rseq.c	rseq: Fix segfault on registration when rseq_cs is non-zero	2025-07-17 18:32:15 +02:00
scftorture.c
scs.c
seccomp.c
signal.c
smp.c
smpboot.c
smpboot.h
softirq.c	lockdep: Fix wait context check on softirq for PREEMPT_RT	2025-06-04 14:40:03 +02:00
stackleak.c
stacktrace.c
static_call_inline.c
static_call.c
stop_machine.c
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 12:05:05 +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
watch_queue.c
watchdog_hld.c
watchdog.c
workqueue_internal.h
workqueue.c