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Message-Id: <20180524093207.696336684@linuxfoundation.org>
Date: Thu, 24 May 2018 11:39:05 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, John Stultz <john.stultz@...aro.org>,
Daniel Mentz <danielmentz@...gle.com>,
Prarit Bhargava <prarit@...hat.com>,
Kevin Brodsky <kevin.brodsky@....com>,
Richard Cochran <richardcochran@...il.com>,
Stephen Boyd <stephen.boyd@...aro.org>,
Will Deacon <will.deacon@....com>,
Miroslav Lichvar <mlichvar@...hat.com>,
Thomas Gleixner <tglx@...utronix.de>,
Fabrizio Castro <fabrizio.castro@...renesas.com>,
Biju Das <biju.das@...renesas.com>
Subject: [PATCH 4.4 88/92] time: Fix CLOCK_MONOTONIC_RAW sub-nanosecond accounting
4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: John Stultz <john.stultz@...aro.org>
commit 3d88d56c5873f6eebe23e05c3da701960146b801 upstream.
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 <john.stultz@...aro.org>
Tested-by: Daniel Mentz <danielmentz@...gle.com>
Cc: Prarit Bhargava <prarit@...hat.com>
Cc: Kevin Brodsky <kevin.brodsky@....com>
Cc: Richard Cochran <richardcochran@...il.com>
Cc: Stephen Boyd <stephen.boyd@...aro.org>
Cc: Will Deacon <will.deacon@....com>
Cc: "stable #4 . 8+" <stable@...r.kernel.org>
Cc: Miroslav Lichvar <mlichvar@...hat.com>
Link: http://lkml.kernel.org/r/1496965462-20003-3-git-send-email-john.stultz@linaro.org
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
[fabrizio: cherry-pick to 4.4. Kept cycle_t type for function
logarithmic_accumulation local variable "interval". Dropped
casting of "interval" variable]
Signed-off-by: Fabrizio Castro <fabrizio.castro@...renesas.com>
Signed-off-by: Biju Das <biju.das@...renesas.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
include/linux/timekeeper_internal.h | 4 ++--
kernel/time/timekeeping.c | 20 ++++++++++----------
2 files changed, 12 insertions(+), 12 deletions(-)
--- a/include/linux/timekeeper_internal.h
+++ b/include/linux/timekeeper_internal.h
@@ -56,7 +56,7 @@ struct tk_read_base {
* interval.
* @xtime_remainder: Shifted nano seconds left over when rounding
* @cycle_interval
- * @raw_interval: Raw nano seconds accumulated per NTP interval.
+ * @raw_interval: Shifted raw nano seconds accumulated per NTP interval.
* @ntp_error: Difference between accumulated time and NTP time in ntp
* shifted nano seconds.
* @ntp_error_shift: Shift conversion between clock shifted nano seconds and
@@ -97,7 +97,7 @@ struct timekeeper {
cycle_t cycle_interval;
u64 xtime_interval;
s64 xtime_remainder;
- u32 raw_interval;
+ u64 raw_interval;
/* The ntp_tick_length() value currently being used.
* This cached copy ensures we consistently apply the tick
* length for an entire tick, as ntp_tick_length may change
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -277,8 +277,7 @@ static void tk_setup_internals(struct ti
/* Go back from cycles -> shifted ns */
tk->xtime_interval = (u64) interval * clock->mult;
tk->xtime_remainder = ntpinterval - tk->xtime_interval;
- tk->raw_interval =
- ((u64) interval * clock->mult) >> clock->shift;
+ tk->raw_interval = interval * clock->mult;
/* if changing clocks, convert xtime_nsec shift units */
if (old_clock) {
@@ -1767,7 +1766,7 @@ static cycle_t logarithmic_accumulation(
unsigned int *clock_set)
{
cycle_t interval = tk->cycle_interval << shift;
- u64 raw_nsecs;
+ u64 snsec_per_sec;
/* If the offset is smaller than a shifted interval, do nothing */
if (offset < interval)
@@ -1782,14 +1781,15 @@ static cycle_t logarithmic_accumulation(
*clock_set |= accumulate_nsecs_to_secs(tk);
/* Accumulate raw time */
- raw_nsecs = (u64)tk->raw_interval << shift;
- raw_nsecs += tk->raw_time.tv_nsec;
- if (raw_nsecs >= NSEC_PER_SEC) {
- u64 raw_secs = raw_nsecs;
- raw_nsecs = do_div(raw_secs, NSEC_PER_SEC);
- tk->raw_time.tv_sec += raw_secs;
+ tk->tkr_raw.xtime_nsec += (u64)tk->raw_time.tv_nsec << tk->tkr_raw.shift;
+ tk->tkr_raw.xtime_nsec += tk->raw_interval << shift;
+ snsec_per_sec = (u64)NSEC_PER_SEC << tk->tkr_raw.shift;
+ while (tk->tkr_raw.xtime_nsec >= snsec_per_sec) {
+ tk->tkr_raw.xtime_nsec -= snsec_per_sec;
+ tk->raw_time.tv_sec++;
}
- tk->raw_time.tv_nsec = raw_nsecs;
+ tk->raw_time.tv_nsec = tk->tkr_raw.xtime_nsec >> tk->tkr_raw.shift;
+ tk->tkr_raw.xtime_nsec -= (u64)tk->raw_time.tv_nsec << tk->tkr_raw.shift;
/* Accumulate error between NTP and clock interval */
tk->ntp_error += tk->ntp_tick << shift;
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