Frederic Weisbecker 0e07c0c84a tick: Move got_idle_tick away from common flags ... [ Upstream commit 3ce74f1a85 ] tick_nohz_idle_got_tick() is called by cpuidle_reflect() within the idle loop with interrupts enabled. This function modifies the struct tick_sched's bitfield "got_idle_tick". However this bitfield is stored within the same mask as other bitfields that can be modified from interrupts. Fortunately so far it looks like the only race that can happen is while writing ->got_idle_tick to 0, an interrupt fires and writes the ->idle_active field to 0. It's then possible that the interrupted write to ->got_idle_tick writes back the old value of ->idle_active back to 1. However if that happens, the worst possible outcome is that the time spent between that interrupt and the upcoming call to tick_nohz_idle_exit() is accounted as idle, which is negligible quantity. Still all the bitfield writes within this struct tick_sched's shadow mask should be IRQ-safe. Therefore move this bitfield out to its own storage to avoid further suprises. Signed-off-by: Frederic Weisbecker <frederic@kernel.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lore.kernel.org/r/20240225225508.11587-12-frederic@kernel.org Signed-off-by: Sasha Levin <sashal@kernel.org>		2024-08-29 17:33:35 +02:00
..
bpf	bpf: Avoid kfree_rcu() under lock in bpf_lpm_trie.	2024-08-19 06:04:27 +02:00
cgroup	cgroup: Avoid extra dereference in css_populate_dir()	2024-08-29 17:33:24 +02:00
configs	Kbuild updates for v6.6	2023-09-05 11:01:47 -07:00
debug	kdb: Use the passed prompt in kdb_position_cursor()	2024-08-03 08:54:34 +02:00
dma	dma: fix call order in dmam_free_coherent	2024-08-03 08:54:36 +02:00
entry	entry: Respect changes to system call number by trace_sys_enter()	2024-04-03 15:28:50 +02:00
events	bpf, events: Use prog to emit ksymbol event for main program	2024-08-03 08:54:36 +02:00
futex	futex: Don't include process MM in futex key on no-MMU	2023-11-20 11:58:53 +01:00
gcov	gcov: add support for GCC 14	2024-06-27 13:49:13 +02:00
irq	genirq/cpuhotplug: Retry with cpu_online_mask when migration fails	2024-08-19 06:04:24 +02:00
kcsan
livepatch	livepatch: Fix missing newline character in klp_resolve_symbols()	2023-11-20 11:59:25 +01:00
locking	locking/rwsem: Add __always_inline annotation to __down_write_common() and inlined callers	2024-08-03 08:53:42 +02:00
module	module: make waiting for a concurrent module loader interruptible	2024-08-14 13:58:53 +02:00
power	PM: s2idle: Make sure CPUs will wakeup directly on resume	2024-04-17 11:19:26 +02:00
printk	printk: For @suppress_panic_printk check for other CPU in panic	2024-04-13 13:07:29 +02:00
rcu	rcu: Eliminate rcu_gp_slow_unregister() false positive	2024-08-29 17:33:23 +02:00
sched	sched/topology: Handle NUMA_NO_NODE in sched_numa_find_nth_cpu()	2024-08-29 17:33:24 +02:00
time	tick: Move got_idle_tick away from common flags	2024-08-29 17:33:35 +02:00
trace	tracing: Fix overflow in get_free_elt()	2024-08-14 13:58:58 +02:00
.gitignore
acct.c	audit/stable-6.6 PR 20230829	2023-08-30 08:17:35 -07:00
async.c	async: Introduce async_schedule_dev_nocall()	2024-01-31 16:18:49 -08:00
audit_fsnotify.c
audit_tree.c
audit_watch.c	audit: don't WARN_ON_ONCE(!current->mm) in audit_exe_compare()	2023-11-28 17:19:56 +00:00
audit.c	audit: Send netlink ACK before setting connection in auditd_set	2024-02-05 20:14:14 +00:00
audit.h
auditfilter.c	ima: Avoid blocking in RCU read-side critical section	2024-07-11 12:49:18 +02:00
auditsc.c	audit,io_uring: io_uring openat triggers audit reference count underflow	2023-10-13 18:34:46 +02:00
backtracetest.c
bounds.c	bounds: Use the right number of bits for power-of-two CONFIG_NR_CPUS	2024-05-02 16:32:50 +02:00
capability.c
cfi.c
compat.c
configs.c
context_tracking.c
cpu_pm.c
cpu.c	cpu/SMT: Enable SMT only if a core is online	2024-08-29 17:33:30 +02:00
crash_core.c	mm: turn folio_test_hugetlb into a PageType	2024-05-02 16:32:47 +02:00
crash_dump.c
cred.c	cred: get rid of CONFIG_DEBUG_CREDENTIALS	2023-12-20 17:01:51 +01:00
delayacct.c
dma.c
exec_domain.c
exit.c	mm: optimize the redundant loop of mm_update_owner_next()	2024-07-11 12:49:15 +02:00
extable.c
fail_function.c
fork.c	Revert "fork: defer linking file vma until vma is fully initialized"	2024-06-21 14:38:47 +02:00
freezer.c
gen_kheaders.sh	kheaders: explicitly define file modes for archived headers	2024-06-21 14:38:40 +02:00
groups.c
hung_task.c
iomem.c
irq_work.c
jump_label.c	jump_label: Fix the fix, brown paper bags galore	2024-08-14 13:58:38 +02:00
kallsyms_internal.h
kallsyms_selftest.c	Modules changes for v6.6-rc1	2023-08-29 17:32:32 -07:00
kallsyms_selftest.h
kallsyms.c
kcmp.c
Kconfig.freezer
Kconfig.hz
Kconfig.kexec	kexec: select CRYPTO from KEXEC_FILE instead of depending on it	2024-01-05 15:19:41 +01:00
Kconfig.locks
Kconfig.preempt
kcov.c	kcov: properly check for softirq context	2024-08-14 13:58:57 +02:00
kexec_core.c	kexec: do syscore_shutdown() in kernel_kexec	2024-01-31 16:18:56 -08:00
kexec_elf.c
kexec_file.c	integrity-v6.6	2023-08-30 09:16:56 -07:00
kexec_internal.h
kexec.c	kernel: kexec: copy user-array safely	2023-11-28 17:19:40 +00:00
kheaders.c
kprobes.c	kprobes: Fix to check symbol prefixes correctly	2024-08-14 13:58:51 +02:00
ksyms_common.c
ksysfs.c
kthread.c	kthread: add kthread_stop_put	2024-06-12 11:12:52 +02:00
latencytop.c
Makefile	kernel/numa.c: Move logging out of numa.h	2024-06-12 11:11:50 +02:00
module_signature.c
notifier.c
nsproxy.c
numa.c	kernel/numa.c: Move logging out of numa.h	2024-06-12 11:11:50 +02:00
padata.c	padata: Fix possible divide-by-0 panic in padata_mt_helper()	2024-08-14 13:58:59 +02:00
panic.c	panic: Flush kernel log buffer at the end	2024-04-13 13:07:29 +02:00
params.c
pid_namespace.c	zap_pid_ns_processes: clear TIF_NOTIFY_SIGNAL along with TIF_SIGPENDING	2024-06-21 14:38:50 +02:00
pid_sysctl.h
pid.c	pidfd: prevent a kernel-doc warning	2023-09-19 13:21:33 -07:00
profile.c	profiling: remove profile=sleep support	2024-08-14 13:58:47 +02:00
ptrace.c
range.c
reboot.c	kernel/reboot: emergency_restart: Set correct system_state	2023-11-28 17:20:04 +00:00
regset.c
relay.c
resource_kunit.c
resource.c	kernel/resource: Increment by align value in get_free_mem_region()	2024-01-10 17:16:58 +01:00
rseq.c
scftorture.c	scftorture: Pause testing after memory-allocation failure	2023-07-14 15:02:57 -07:00
scs.c
seccomp.c
signal.c	kernel: rerun task_work while freezing in get_signal()	2024-08-03 08:54:13 +02:00
smp.c	smp,csd: Throw an error if a CSD lock is stuck for too long	2023-11-28 17:19:36 +00:00
smpboot.c	kthread: add kthread_stop_put	2024-06-12 11:12:52 +02:00
smpboot.h
softirq.c	softirq: Fix suspicious RCU usage in __do_softirq()	2024-06-12 11:11:27 +02:00
stackleak.c
stacktrace.c
static_call_inline.c
static_call.c
stop_machine.c
sys_ni.c	syscalls: fix compat_sys_io_pgetevents_time64 usage	2024-07-05 09:34:04 +02:00
sys.c	prctl: generalize PR_SET_MDWE support check to be per-arch	2024-04-03 15:28:54 +02:00
sysctl-test.c
sysctl.c
task_work.c	task_work: Introduce task_work_cancel() again	2024-08-03 08:54:16 +02:00
taskstats.c
torture.c	rcutorture: Fix stuttering races and other issues	2023-11-28 17:20:08 +00:00
tracepoint.c
tsacct.c
ucount.c
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
vhost_task.c	vhost_task: Handle SIGKILL by flushing work and exiting	2024-07-11 12:49:10 +02:00
watch_queue.c	kernel: watch_queue: copy user-array safely	2023-11-28 17:19:40 +00:00
watchdog_buddy.c
watchdog_perf.c	watchdog/perf: properly initialize the turbo mode timestamp and rearm counter	2024-08-03 08:54:29 +02:00
watchdog.c	watchdog: move softlockup_panic back to early_param	2023-11-28 17:19:57 +00:00
workqueue_internal.h
workqueue.c	workqueue: Fix selection of wake_cpu in kick_pool()	2024-05-17 12:02:31 +02:00