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linux/kernel/time
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Sebastian Andrzej Siewior 9f8eeac3a6 timekeeping: Add a lockdep override in tick_freeze() 
[ Upstream commit 92e250c624 ]

tick_freeze() acquires a raw spinlock (tick_freeze_lock). Later in the
callchain (timekeeping_suspend() -> mc146818_avoid_UIP()) the RTC driver
acquires a spinlock which becomes a sleeping lock on PREEMPT_RT.  Lockdep
complains about this lock nesting.

Add a lockdep override for this special case and a comment explaining
why it is okay.

Reported-by: Borislav Petkov <bp@alien8.de>
Reported-by: Chris Bainbridge <chris.bainbridge@gmail.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/all/20250404133429.pnAzf-eF@linutronix.de
Closes: https://lore.kernel.org/all/20250330113202.GAZ-krsjAnurOlTcp-@fat_crate.local/
Closes: https://lore.kernel.org/all/CAP-bSRZ0CWyZZsMtx046YV8L28LhY0fson2g4EqcwRAVN1Jk+Q@mail.gmail.com/
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-05-02 07:59:25 +02:00
..
alarmtimer.c treewide: Fix wrong singular form of jiffies in comments 2024-09-08 20:47:40 +02:00
clockevents.c treewide: Fix wrong singular form of jiffies in comments 2024-09-08 20:47:40 +02:00
clocksource-wdtest.c time: Add MODULE_DESCRIPTION() to time test modules 2024-06-03 11:18:50 +02:00
clocksource.c clocksource: Use migrate_disable() to avoid calling get_random_u32() in atomic context 2025-02-21 14:01:38 +01:00
hrtimer.c hrtimers: Mark is_migration_base() with __always_inline 2025-03-22 12:54:14 -07:00
itimer.c time: Prevent undefined behaviour in timespec64_to_ns() 2020-10-26 11:48:11 +01:00
jiffies.c clocksource: Make clocksource watchdog test safe for slow-HZ systems 2021-08-28 17:01:32 +02:00
Kconfig timekeeping: Always check for negative motion 2024-12-14 20:03:38 +01:00
Makefile timers: Implement the hierarchical pull model 2024-02-22 17:52:32 +01:00
namespace.c vdso/timens: Refactor copy-pasted find_timens_vvar_page() helper into one copy 2022-12-01 11:35:40 +01:00
ntp.c ntp: Remove invalid cast in time offset math 2024-12-14 20:03:12 +01:00
ntp_internal.h ntp: Make sure RTC is synchronized when time goes backwards 2024-09-10 13:50:40 +02:00
posix-clock.c posix-clock: posix-clock: Fix unbalanced locking in pc_clock_settime() 2024-10-23 16:05:01 +02:00
posix-cpu-timers.c posix-timers: Consolidate signal queueing 2024-07-29 21:57:35 +02:00
posix-stubs.c posix-timers: Get rid of [COMPAT_]SYS_NI() uses 2023-12-20 21:30:27 -08:00
posix-timers.c treewide: Fix wrong singular form of jiffies in comments 2024-09-08 20:47:40 +02:00
posix-timers.h posix-timers: Consolidate signal queueing 2024-07-29 21:57:35 +02:00
sched_clock.c time/sched_clock: Provide sched_clock_noinstr() 2023-06-05 21:11:04 +02:00
test_udelay.c time: Add MODULE_DESCRIPTION() to time test modules 2024-06-03 11:18:50 +02:00
tick-broadcast-hrtimer.c time/tick-broadcast: Remove RCU_NONIDLE() usage 2023-01-13 11:48:16 +01:00
tick-broadcast.c tick/broadcast: Move per CPU pointer access into the atomic section 2024-07-31 12:37:43 +02:00
tick-common.c timekeeping: Add a lockdep override in tick_freeze() 2025-05-02 07:59:25 +02:00
tick-internal.h tick: Move broadcast cancellation up to CPUHP_AP_TICK_DYING 2024-02-26 11:37:32 +01:00
tick-legacy.c timekeeping: remove xtime_update 2020-10-30 21:57:07 +01:00
tick-oneshot.c time: Fix various kernel-doc problems 2023-01-03 11:07:58 +01:00
tick-sched.c sched/fair: Fix external p->on_rq users 2024-10-14 09:14:35 +02:00
tick-sched.h tick/sched: Fix struct tick_sched doc warnings 2024-04-01 10:36:35 +02:00
time.c time: Fix references to _msecs_to_jiffies() handling of values 2024-12-05 14:01:22 +01:00
time_test.c time: Add MODULE_DESCRIPTION() to time test modules 2024-06-03 11:18:50 +02:00
timeconst.bc time: Add SPDX license identifiers 2018-11-23 11:51:20 +01:00
timeconv.c time: Improve performance of time64_to_tm() 2021-06-24 11:51:59 +02:00
timecounter.c time/timecounter: Mark 1st argument of timecounter_cyc2time() as const 2021-04-16 21:03:50 +02:00
timekeeping.c clocksource: Make negative motion detection more robust 2024-12-14 20:04:16 +01:00
timekeeping.h asm-generic: cross-architecture timer cleanup 2020-12-16 00:07:17 -08:00
timekeeping_debug.c timekeeping/debug: No need to check return value of debugfs_create functions 2019-01-29 20:08:41 +01:00
timekeeping_internal.h clocksource: Make negative motion detection more robust 2024-12-14 20:04:16 +01:00
timer.c timers: Add missing READ_ONCE() in __run_timer_base() 2024-12-05 14:01:22 +01:00
timer_list.c tick: Split nohz and highres features from nohz_mode 2024-02-26 11:37:32 +01:00
timer_migration.c timers/migration: Fix off-by-one root mis-connection 2025-02-17 10:05:44 +01:00
timer_migration.h timers/migration: Rename childmask by groupmask to make naming more obvious 2024-07-22 18:03:34 +02:00
vsyscall.c vdso: Add vdso_data:: Max_cycles 2024-04-08 15:03:07 +02:00