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58faf20a086bd34f91983609e26eac3d5fe76be3
linux/kernel/time
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Ahmed S. Darwish 58faf20a08 time/sched_clock: Use raw_read_seqcount_latch() during suspend 
sched_clock uses seqcount_t latching to switch between two storage
places protected by the sequence counter. This allows it to have
interruptible, NMI-safe, seqcount_t write side critical sections.

Since 7fc26327b7 ("seqlock: Introduce raw_read_seqcount_latch()"),
raw_read_seqcount_latch() became the standardized way for seqcount_t
latch read paths. Due to the dependent load, it has one read memory
barrier less than the currently used raw_read_seqcount() API.

Use raw_read_seqcount_latch() for the suspend path.

Commit aadd6e5caa ("time/sched_clock: Use raw_read_seqcount_latch()")
missed changing that instance of raw_read_seqcount().

References: 1809bfa44e ("timers, sched/clock: Avoid deadlock during read from NMI")
Signed-off-by: Ahmed S. Darwish <a.darwish@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200715092345.GA231464@debian-buster-darwi.lab.linutronix.de
2020-09-10 11:19:28 +02:00
..
alarmtimer.c
time: Delete repeated words in comments
2020-08-10 22:14:07 +02:00
clockevents.c
tick: Remove outgoing CPU from broadcast masks
2019-03-23 18:26:43 +01:00
clocksource.c
clocksource: Remove obsolete ifdef
2020-06-09 16:36:47 +02:00
hrtimer.c
hrtimer: Use sequence counter with associated raw spinlock
2020-07-29 16:14:29 +02:00
itimer.c
y2038: rename itimerval to __kernel_old_itimerval
2019-12-18 18:07:33 +01:00
jiffies.c
timekeeping: Split jiffies seqlock
2020-03-21 16:00:23 +01:00
Kconfig
posix-cpu-timers: Provide mechanisms to defer timer handling to task_work
2020-08-06 16:50:59 +02:00
Makefile
ns: Introduce Time Namespace
2020-01-14 12:20:48 +01:00
namespace.c
nsproxy: support CLONE_NEWTIME with setns()
2020-07-08 11:14:22 +02:00
ntp_internal.h
ntp: Audit NTP parameters adjustment
2019-04-15 18:14:01 -04:00
ntp.c
ntp/y2038: Remove incorrect time_t truncation
2019-11-12 08:13:44 +01:00
posix-clock.c
posix-clocks: Rename the clock_get() callback to clock_get_timespec()
2020-01-14 12:20:49 +01:00
posix-cpu-timers.c
posix-cpu-timers: Provide mechanisms to defer timer handling to task_work
2020-08-06 16:50:59 +02:00
posix-stubs.c
posix-timers: Make clock_nanosleep() time namespace aware
2020-01-14 12:20:55 +01:00
posix-timers.c
posix-timers: Pass lockdep expression to RCU lists
2020-02-17 20:12:19 +01:00
posix-timers.h
posix-clocks: Introduce clock_get_ktime() callback
2020-01-14 12:20:51 +01:00
sched_clock.c
time/sched_clock: Use raw_read_seqcount_latch() during suspend
2020-09-10 11:19:28 +02:00
test_udelay.c
time/debug: Remove license boilerplate
2018-11-23 11:51:21 +01:00
tick-broadcast-hrtimer.c
tick: broadcast-hrtimer: Fix a race in bc_set_next
2019-09-27 14:45:55 +02:00
tick-broadcast.c
tick: Fix typos in comments
2019-04-19 19:17:04 +02:00
tick-common.c
timekeeping: Split jiffies seqlock
2020-03-21 16:00:23 +01:00
tick-internal.h
tick: Remove outgoing CPU from broadcast masks
2019-03-23 18:26:43 +01:00
tick-oneshot.c
hrtimers/tick/clockevents: Remove sloppy license references
2018-11-23 11:51:21 +01:00
tick-sched.c
tick/nohz: Narrow down noise while setting current task's tick dependency
2020-06-29 11:58:50 -07:00
tick-sched.h
tick/sched: Update tick_sched struct documentation
2019-03-24 20:29:32 +01:00
time.c
y2038: remove unused time32 interfaces
2020-02-21 11:22:15 -08:00
timeconst.bc
time: Add SPDX license identifiers
2018-11-23 11:51:20 +01:00
timeconv.c
time: Add SPDX license identifiers
2018-11-23 11:51:20 +01:00
timecounter.c
time: Remove license boilerplate
2018-11-23 11:51:21 +01:00
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
Merge tag 'timers-urgent-2020-08-14' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2020-08-14 14:26:08 -07:00
timekeeping.h
timekeeping: Split jiffies seqlock
2020-03-21 16:00:23 +01:00
timer_list.c
timer_list: Guard procfs specific code
2019-06-23 00:08:52 +02:00
timer.c
posix-cpu-timers: Provide mechanisms to defer timer handling to task_work
2020-08-06 16:50:59 +02:00
vsyscall.c
timekeeping/vsyscall: Provide vdso_update_begin/end()
2020-08-06 10:57:30 +02:00