Sebastian Andrzej Siewior dc18c5b130 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>

2025-05-02 07:51:00 +02:00

..

alarmtimer.c

alarmtimer: Remove unnecessary (void *) cast

2023-06-18 22:41:53 +02:00

clockevents.c

clockevents: Repair kernel-doc for clockevent_delta2ns()

2022-12-01 13:35:41 +01:00

clocksource-wdtest.c

clocksource: Scale the watchdog read retries automatically

2024-08-14 13:58:56 +02:00

clocksource.c

clocksource: Use migrate_disable() to avoid calling get_random_u32() in atomic context

2025-02-21 13:57:20 +01:00

hrtimer.c

hrtimers: Mark is_migration_base() with __always_inline

2025-03-22 12:50:40 -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

clocksource: Loosen clocksource watchdog constraints

2023-01-03 20:43:45 -08:00

Makefile

time: Improve performance of time64_to_tm()

2021-06-24 11:51:59 +02:00

namespace.c

vdso/timens: Refactor copy-pasted find_timens_vvar_page() helper into one copy

2022-12-01 11:35:40 +01:00

ntp_internal.h

ntp: Make the RTC synchronization more reliable

2020-12-11 10:40:52 +01:00

ntp.c

ntp: Remove invalid cast in time offset math

2024-12-14 19:59:44 +01:00

posix-clock.c

posix-clock: posix-clock: Fix unbalanced locking in pc_clock_settime()

2024-11-01 01:58:30 +01:00

posix-cpu-timers.c

posix-cpu-timers: Implement the missing timer_wait_running callback

2023-04-21 15:34:33 +02:00

posix-stubs.c

posix-timers: Get rid of [COMPAT_]SYS_NI() uses

2024-01-20 11:51:46 +01:00

posix-timers.c

posix-timers: Refer properly to CONFIG_HIGH_RES_TIMERS

2023-06-18 22:41:53 +02:00

posix-timers.h

posix-clocks: Introduce clock_get_ktime() callback

2020-01-14 12:20:51 +01:00

sched_clock.c

time/sched_clock: Provide sched_clock_noinstr()

2023-06-05 21:11:04 +02:00

test_udelay.c

time/debug: Fix memory leak with using debugfs_lookup()

2023-02-09 20:12:27 +01:00

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

2024-08-14 13:58:55 +02:00

tick-common.c

timekeeping: Add a lockdep override in tick_freeze()

2025-05-02 07:51:00 +02:00

tick-internal.h

clocksource: Make clocksource watchdog test safe for slow-HZ systems

2021-08-28 17:01:32 +02:00

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

tick/sched: Preserve number of idle sleeps across CPU hotplug events

2024-01-31 16:19:13 -08:00

tick-sched.h

tick: Move got_idle_tick away from common flags

2024-08-29 17:33:35 +02:00

time_test.c

time: test: Fix incorrect format specifier

2024-03-26 18:19:18 -04:00

time.c

time: Fix references to _msecs_to_jiffies() handling of values

2024-12-09 10:31:50 +01:00

timeconst.bc

…

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_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

timekeeping/vsyscall: Provide vdso_update_begin/end()

2020-08-06 10:57:30 +02:00

timekeeping.c

timekeeping: Fix bogus clock_was_set() invocation in do_adjtimex()

2024-08-14 13:58:57 +02:00

timekeeping.h

Merge tag 'asm-generic-timers-5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic

2020-12-16 00:07:17 -08:00

timer_list.c

timer_list: Print name of per-cpu wakeup device

2021-05-31 17:04:49 +02:00

timer.c

timers: Provide timer_shutdown[_sync]()

2022-11-24 15:09:12 +01:00

vsyscall.c

timekeeping, clocksource: Fix various typos in comments

2021-03-22 23:06:48 +01:00