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-rw-r--r--kernel/time/timekeeping.c90
1 files changed, 54 insertions, 36 deletions
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 05b37a5ec7fb..4da65592b4d9 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -65,14 +65,14 @@ struct timekeeper {
* used instead.
*/
struct timespec wall_to_monotonic;
- /* time spent in suspend */
- struct timespec total_sleep_time;
- /* The raw monotonic time for the CLOCK_MONOTONIC_RAW posix clock. */
- struct timespec raw_time;
/* Offset clock monotonic -> clock realtime */
ktime_t offs_real;
+ /* time spent in suspend */
+ struct timespec total_sleep_time;
/* Offset clock monotonic -> clock boottime */
ktime_t offs_boot;
+ /* The raw monotonic time for the CLOCK_MONOTONIC_RAW posix clock. */
+ struct timespec raw_time;
/* Seqlock for all timekeeper values */
seqlock_t lock;
};
@@ -117,6 +117,31 @@ static void tk_xtime_add(struct timekeeper *tk, const struct timespec *ts)
tk->xtime_nsec += (u64)ts->tv_nsec << tk->shift;
}
+static void tk_set_wall_to_mono(struct timekeeper *tk, struct timespec wtm)
+{
+ struct timespec tmp;
+
+ /*
+ * Verify consistency of: offset_real = -wall_to_monotonic
+ * before modifying anything
+ */
+ set_normalized_timespec(&tmp, -tk->wall_to_monotonic.tv_sec,
+ -tk->wall_to_monotonic.tv_nsec);
+ WARN_ON_ONCE(tk->offs_real.tv64 != timespec_to_ktime(tmp).tv64);
+ tk->wall_to_monotonic = wtm;
+ set_normalized_timespec(&tmp, -wtm.tv_sec, -wtm.tv_nsec);
+ tk->offs_real = timespec_to_ktime(tmp);
+}
+
+static void tk_set_sleep_time(struct timekeeper *tk, struct timespec t)
+{
+ /* Verify consistency before modifying */
+ WARN_ON_ONCE(tk->offs_boot.tv64 != timespec_to_ktime(tk->total_sleep_time).tv64);
+
+ tk->total_sleep_time = t;
+ tk->offs_boot = timespec_to_ktime(t);
+}
+
/**
* timekeeper_setup_internals - Set up internals to use clocksource clock.
*
@@ -217,14 +242,6 @@ static inline s64 timekeeping_get_ns_raw(struct timekeeper *tk)
return nsec + arch_gettimeoffset();
}
-static void update_rt_offset(struct timekeeper *tk)
-{
- struct timespec tmp, *wtm = &tk->wall_to_monotonic;
-
- set_normalized_timespec(&tmp, -wtm->tv_sec, -wtm->tv_nsec);
- tk->offs_real = timespec_to_ktime(tmp);
-}
-
/* must hold write on timekeeper.lock */
static void timekeeping_update(struct timekeeper *tk, bool clearntp)
{
@@ -234,7 +251,6 @@ static void timekeeping_update(struct timekeeper *tk, bool clearntp)
tk->ntp_error = 0;
ntp_clear();
}
- update_rt_offset(tk);
xt = tk_xtime(tk);
update_vsyscall(&xt, &tk->wall_to_monotonic, tk->clock, tk->mult);
}
@@ -419,8 +435,8 @@ int do_settimeofday(const struct timespec *tv)
ts_delta.tv_sec = tv->tv_sec - xt.tv_sec;
ts_delta.tv_nsec = tv->tv_nsec - xt.tv_nsec;
- timekeeper.wall_to_monotonic =
- timespec_sub(timekeeper.wall_to_monotonic, ts_delta);
+ tk_set_wall_to_mono(&timekeeper,
+ timespec_sub(timekeeper.wall_to_monotonic, ts_delta));
tk_set_xtime(&timekeeper, tv);
@@ -454,8 +470,8 @@ int timekeeping_inject_offset(struct timespec *ts)
tk_xtime_add(&timekeeper, ts);
- timekeeper.wall_to_monotonic =
- timespec_sub(timekeeper.wall_to_monotonic, *ts);
+ tk_set_wall_to_mono(&timekeeper,
+ timespec_sub(timekeeper.wall_to_monotonic, *ts));
timekeeping_update(&timekeeper, true);
@@ -621,7 +637,7 @@ void __init timekeeping_init(void)
{
struct clocksource *clock;
unsigned long flags;
- struct timespec now, boot;
+ struct timespec now, boot, tmp;
read_persistent_clock(&now);
read_boot_clock(&boot);
@@ -642,23 +658,19 @@ void __init timekeeping_init(void)
if (boot.tv_sec == 0 && boot.tv_nsec == 0)
boot = tk_xtime(&timekeeper);
- set_normalized_timespec(&timekeeper.wall_to_monotonic,
- -boot.tv_sec, -boot.tv_nsec);
- update_rt_offset(&timekeeper);
- timekeeper.total_sleep_time.tv_sec = 0;
- timekeeper.total_sleep_time.tv_nsec = 0;
+ set_normalized_timespec(&tmp, -boot.tv_sec, -boot.tv_nsec);
+ tk_set_wall_to_mono(&timekeeper, tmp);
+
+ tmp.tv_sec = 0;
+ tmp.tv_nsec = 0;
+ tk_set_sleep_time(&timekeeper, tmp);
+
write_sequnlock_irqrestore(&timekeeper.lock, flags);
}
/* time in seconds when suspend began */
static struct timespec timekeeping_suspend_time;
-static void update_sleep_time(struct timespec t)
-{
- timekeeper.total_sleep_time = t;
- timekeeper.offs_boot = timespec_to_ktime(t);
-}
-
/**
* __timekeeping_inject_sleeptime - Internal function to add sleep interval
* @delta: pointer to a timespec delta value
@@ -674,10 +686,9 @@ static void __timekeeping_inject_sleeptime(struct timekeeper *tk,
"sleep delta value!\n");
return;
}
-
tk_xtime_add(tk, delta);
- tk->wall_to_monotonic = timespec_sub(tk->wall_to_monotonic, *delta);
- update_sleep_time(timespec_add(tk->total_sleep_time, *delta));
+ tk_set_wall_to_mono(tk, timespec_sub(tk->wall_to_monotonic, *delta));
+ tk_set_sleep_time(tk, timespec_add(tk->total_sleep_time, *delta));
}
/**
@@ -1018,11 +1029,18 @@ static inline void accumulate_nsecs_to_secs(struct timekeeper *tk)
/* Figure out if its a leap sec and apply if needed */
leap = second_overflow(tk->xtime_sec);
- tk->xtime_sec += leap;
- tk->wall_to_monotonic.tv_sec -= leap;
- if (leap)
- clock_was_set_delayed();
+ if (unlikely(leap)) {
+ struct timespec ts;
+
+ tk->xtime_sec += leap;
+ ts.tv_sec = leap;
+ ts.tv_nsec = 0;
+ tk_set_wall_to_mono(tk,
+ timespec_sub(tk->wall_to_monotonic, ts));
+
+ clock_was_set_delayed();
+ }
}
}