John Stultz 3d88d56c58 time: Fix CLOCK_MONOTONIC_RAW sub-nanosecond accounting ...

Due to how the MONOTONIC_RAW accumulation logic was handled,
there is the potential for a 1ns discontinuity when we do
accumulations. This small discontinuity has for the most part
gone un-noticed, but since ARM64 enabled CLOCK_MONOTONIC_RAW
in their vDSO clock_gettime implementation, we've seen failures
with the inconsistency-check test in kselftest.

This patch addresses the issue by using the same sub-ns
accumulation handling that CLOCK_MONOTONIC uses, which avoids
the issue for in-kernel users.

Since the ARM64 vDSO implementation has its own clock_gettime
calculation logic, this patch reduces the frequency of errors,
but failures are still seen. The ARM64 vDSO will need to be
updated to include the sub-nanosecond xtime_nsec values in its
calculation for this issue to be completely fixed.

Signed-off-by: John Stultz <[email protected]>
Tested-by: Daniel Mentz <[email protected]>
Cc: Prarit Bhargava <[email protected]>
Cc: Kevin Brodsky <[email protected]>
Cc: Richard Cochran <[email protected]>
Cc: Stephen Boyd <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: "stable #4 . 8+" <[email protected]>
Cc: Miroslav Lichvar <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>

2017-06-20 10:41:50 +02:00

..

alarmtimer.c

alarmtimer: Rate limit periodic intervals

2017-06-04 15:21:18 +02:00

clockevents.c

clockevents: Make clockevents_config() static

2017-03-23 12:14:05 -07:00

clocksource.c

sched/clock, clocksource: Add optional cs::mark_unstable() method

2017-01-14 11:29:43 +01:00

hrtimer.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial

2017-05-02 19:09:35 -07:00

itimer.c

sched/headers: Prepare to move cputime functionality from <linux/sched.h> into <linux/sched/cputime.h>

2017-03-02 08:42:39 +01:00

jiffies.c

jiffies: Revert bogus conversion of NSEC_PER_SEC to TICK_NSEC

2017-03-07 11:03:28 +01:00

Kconfig

…

Makefile

time: Remove CONFIG_TIMER_STATS

2017-02-10 11:15:08 +01:00

ntp_internal.h

…

ntp.c

ktime: Get rid of the union

2016-12-25 17:21:22 +01:00

posix-clock.c

time: Change k_clock timer_set() and timer_get() to use timespec64

2017-04-14 21:49:56 +02:00

posix-cpu-timers.c

posix-timers: Make signal printks conditional

2017-05-23 23:39:57 +02:00

posix-stubs.c

time: Change k_clock nsleep() to use timespec64

2017-04-14 21:49:56 +02:00

posix-timers.c

time: Change k_clock nsleep() to use timespec64

2017-04-14 21:49:56 +02:00

sched_clock.c

timers, sched_clock: Update timeout for clock wrap

2017-03-23 12:30:27 -07:00

test_udelay.c

time: Avoid timespec in udelay_test

2016-06-20 12:47:26 -07:00

tick-broadcast-hrtimer.c

ktime: Get rid of the union

2016-12-25 17:21:22 +01:00

tick-broadcast.c

tick/broadcast: Make tick_broadcast_setup_oneshot() static

2017-06-12 18:56:01 +02:00

tick-common.c

ktime: Cleanup ktime_set() usage

2016-12-25 17:21:22 +01:00

tick-internal.h

tick/broadcast: Make tick_broadcast_setup_oneshot() static

2017-06-12 18:56:01 +02:00

tick-oneshot.c

ktime: Get rid of the union

2016-12-25 17:21:22 +01:00

tick-sched.c

cpufreq: schedutil: Avoid reducing frequency of busy CPUs prematurely

2017-03-23 02:12:14 +01:00

tick-sched.h

Revert "nohz: Fix collision between tick and other hrtimers"

2017-02-16 12:19:18 -08:00

time.c

time: delete current_fs_time()

2017-05-12 15:57:15 -07:00

timeconst.bc

time: Introduce jiffies64_to_nsecs()

2017-02-01 09:13:45 +01:00

timeconv.c

time: Add time64_to_tm()

2016-06-20 12:47:15 -07:00

timecounter.c

clocksource: Use a plain u64 instead of cycle_t

2016-12-25 11:04:12 +01:00

timekeeping_debug.c

timekeeping: Use deferred printk() in debug code

2017-02-15 11:46:08 +01:00

timekeeping_internal.h

clocksource: Use a plain u64 instead of cycle_t

2016-12-25 11:04:12 +01:00

timekeeping.c

time: Fix CLOCK_MONOTONIC_RAW sub-nanosecond accounting

2017-06-20 10:41:50 +02:00

timekeeping.h

timekeeping: Remove unused timekeeping_{get,set}_tai_offset()

2017-01-06 16:47:28 -08:00

timer_list.c

sysrq: Reset the watchdog timers while displaying high-resolution timers

2017-03-23 12:46:53 -07:00

timer.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial

2017-05-02 19:09:35 -07:00