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Diffstat (limited to 'kernel/time/timekeeping.c')
-rw-r--r--kernel/time/timekeeping.c90
1 files changed, 52 insertions, 38 deletions
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 237841378c03..da9e1f9fa8f8 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -139,8 +139,8 @@ static inline s64 timekeeping_get_ns_raw(void)
* This read-write spinlock protects us from races in SMP while
* playing with xtime.
*/
-__cacheline_aligned_in_smp DEFINE_SEQLOCK(xtime_lock);
-
+__cacheline_aligned_in_smp DEFINE_RAW_SPINLOCK(xtime_lock);
+seqcount_t xtime_seq;
/*
* The current time
@@ -222,7 +222,7 @@ void getnstimeofday(struct timespec *ts)
WARN_ON(timekeeping_suspended);
do {
- seq = read_seqbegin(&xtime_lock);
+ seq = read_seqcount_begin(&xtime_seq);
*ts = xtime;
nsecs = timekeeping_get_ns();
@@ -230,7 +230,7 @@ void getnstimeofday(struct timespec *ts)
/* If arch requires, add in gettimeoffset() */
nsecs += arch_gettimeoffset();
- } while (read_seqretry(&xtime_lock, seq));
+ } while (read_seqcount_retry(&xtime_seq, seq));
timespec_add_ns(ts, nsecs);
}
@@ -245,14 +245,14 @@ ktime_t ktime_get(void)
WARN_ON(timekeeping_suspended);
do {
- seq = read_seqbegin(&xtime_lock);
+ seq = read_seqcount_begin(&xtime_seq);
secs = xtime.tv_sec + wall_to_monotonic.tv_sec;
nsecs = xtime.tv_nsec + wall_to_monotonic.tv_nsec;
nsecs += timekeeping_get_ns();
/* If arch requires, add in gettimeoffset() */
nsecs += arch_gettimeoffset();
- } while (read_seqretry(&xtime_lock, seq));
+ } while (read_seqcount_retry(&xtime_seq, seq));
/*
* Use ktime_set/ktime_add_ns to create a proper ktime on
* 32-bit architectures without CONFIG_KTIME_SCALAR.
@@ -278,14 +278,14 @@ void ktime_get_ts(struct timespec *ts)
WARN_ON(timekeeping_suspended);
do {
- seq = read_seqbegin(&xtime_lock);
+ seq = read_seqcount_begin(&xtime_seq);
*ts = xtime;
tomono = wall_to_monotonic;
nsecs = timekeeping_get_ns();
/* If arch requires, add in gettimeoffset() */
nsecs += arch_gettimeoffset();
- } while (read_seqretry(&xtime_lock, seq));
+ } while (read_seqcount_retry(&xtime_seq, seq));
set_normalized_timespec(ts, ts->tv_sec + tomono.tv_sec,
ts->tv_nsec + tomono.tv_nsec + nsecs);
@@ -313,7 +313,7 @@ void getnstime_raw_and_real(struct timespec *ts_raw, struct timespec *ts_real)
do {
u32 arch_offset;
- seq = read_seqbegin(&xtime_lock);
+ seq = read_seqcount_begin(&xtime_seq);
*ts_raw = raw_time;
*ts_real = xtime;
@@ -326,7 +326,7 @@ void getnstime_raw_and_real(struct timespec *ts_raw, struct timespec *ts_real)
nsecs_raw += arch_offset;
nsecs_real += arch_offset;
- } while (read_seqretry(&xtime_lock, seq));
+ } while (read_seqcount_retry(&xtime_seq, seq));
timespec_add_ns(ts_raw, nsecs_raw);
timespec_add_ns(ts_real, nsecs_real);
@@ -365,7 +365,8 @@ int do_settimeofday(const struct timespec *tv)
if ((unsigned long)tv->tv_nsec >= NSEC_PER_SEC)
return -EINVAL;
- write_seqlock_irqsave(&xtime_lock, flags);
+ raw_spin_lock_irqsave(&xtime_lock, flags);
+ write_seqcount_begin(&xtime_seq);
timekeeping_forward_now();
@@ -381,7 +382,8 @@ int do_settimeofday(const struct timespec *tv)
update_vsyscall(&xtime, &wall_to_monotonic, timekeeper.clock,
timekeeper.mult);
- write_sequnlock_irqrestore(&xtime_lock, flags);
+ write_seqcount_end(&xtime_seq);
+ raw_spin_unlock_irqrestore(&xtime_lock, flags);
/* signal hrtimers about time change */
clock_was_set();
@@ -405,7 +407,8 @@ int timekeeping_inject_offset(struct timespec *ts)
if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC)
return -EINVAL;
- write_seqlock_irqsave(&xtime_lock, flags);
+ raw_spin_lock_irqsave(&xtime_lock, flags);
+ write_seqcount_begin(&xtime_seq);
timekeeping_forward_now();
@@ -418,7 +421,8 @@ int timekeeping_inject_offset(struct timespec *ts)
update_vsyscall(&xtime, &wall_to_monotonic, timekeeper.clock,
timekeeper.mult);
- write_sequnlock_irqrestore(&xtime_lock, flags);
+ write_seqcount_end(&xtime_seq);
+ raw_spin_unlock_irqrestore(&xtime_lock, flags);
/* signal hrtimers about time change */
clock_was_set();
@@ -490,11 +494,11 @@ void getrawmonotonic(struct timespec *ts)
s64 nsecs;
do {
- seq = read_seqbegin(&xtime_lock);
+ seq = read_seqcount_begin(&xtime_seq);
nsecs = timekeeping_get_ns_raw();
*ts = raw_time;
- } while (read_seqretry(&xtime_lock, seq));
+ } while (read_seqcount_retry(&xtime_seq, seq));
timespec_add_ns(ts, nsecs);
}
@@ -510,11 +514,11 @@ int timekeeping_valid_for_hres(void)
int ret;
do {
- seq = read_seqbegin(&xtime_lock);
+ seq = read_seqcount_begin(&xtime_seq);
ret = timekeeper.clock->flags & CLOCK_SOURCE_VALID_FOR_HRES;
- } while (read_seqretry(&xtime_lock, seq));
+ } while (read_seqcount_retry(&xtime_seq, seq));
return ret;
}
@@ -572,7 +576,8 @@ void __init timekeeping_init(void)
read_persistent_clock(&now);
read_boot_clock(&boot);
- write_seqlock_irqsave(&xtime_lock, flags);
+ raw_spin_lock_irqsave(&xtime_lock, flags);
+ write_seqcount_begin(&xtime_seq);
ntp_init();
@@ -593,7 +598,8 @@ void __init timekeeping_init(void)
-boot.tv_sec, -boot.tv_nsec);
total_sleep_time.tv_sec = 0;
total_sleep_time.tv_nsec = 0;
- write_sequnlock_irqrestore(&xtime_lock, flags);
+ write_seqcount_end(&xtime_seq);
+ raw_spin_unlock_irqrestore(&xtime_lock, flags);
}
/* time in seconds when suspend began */
@@ -640,7 +646,8 @@ void timekeeping_inject_sleeptime(struct timespec *delta)
if (!(ts.tv_sec == 0 && ts.tv_nsec == 0))
return;
- write_seqlock_irqsave(&xtime_lock, flags);
+ raw_spin_lock_irqsave(&xtime_lock, flags);
+ write_seqcount_begin(&xtime_seq);
timekeeping_forward_now();
__timekeeping_inject_sleeptime(delta);
@@ -650,7 +657,8 @@ void timekeeping_inject_sleeptime(struct timespec *delta)
update_vsyscall(&xtime, &wall_to_monotonic, timekeeper.clock,
timekeeper.mult);
- write_sequnlock_irqrestore(&xtime_lock, flags);
+ write_seqcount_end(&xtime_seq);
+ raw_spin_unlock_irqrestore(&xtime_lock, flags);
/* signal hrtimers about time change */
clock_was_set();
@@ -673,7 +681,8 @@ static void timekeeping_resume(void)
clocksource_resume();
- write_seqlock_irqsave(&xtime_lock, flags);
+ raw_spin_lock_irqsave(&xtime_lock, flags);
+ write_seqcount_begin(&xtime_seq);
if (timespec_compare(&ts, &timekeeping_suspend_time) > 0) {
ts = timespec_sub(ts, timekeeping_suspend_time);
@@ -683,7 +692,8 @@ static void timekeeping_resume(void)
timekeeper.clock->cycle_last = timekeeper.clock->read(timekeeper.clock);
timekeeper.ntp_error = 0;
timekeeping_suspended = 0;
- write_sequnlock_irqrestore(&xtime_lock, flags);
+ write_seqcount_end(&xtime_seq);
+ raw_spin_unlock_irqrestore(&xtime_lock, flags);
touch_softlockup_watchdog();
@@ -701,7 +711,8 @@ static int timekeeping_suspend(void)
read_persistent_clock(&timekeeping_suspend_time);
- write_seqlock_irqsave(&xtime_lock, flags);
+ raw_spin_lock_irqsave(&xtime_lock, flags);
+ write_seqcount_begin(&xtime_seq);
timekeeping_forward_now();
timekeeping_suspended = 1;
@@ -724,7 +735,8 @@ static int timekeeping_suspend(void)
timekeeping_suspend_time =
timespec_add(timekeeping_suspend_time, delta_delta);
}
- write_sequnlock_irqrestore(&xtime_lock, flags);
+ write_seqcount_end(&xtime_seq);
+ raw_spin_unlock_irqrestore(&xtime_lock, flags);
clockevents_notify(CLOCK_EVT_NOTIFY_SUSPEND, NULL);
clocksource_suspend();
@@ -1101,13 +1113,13 @@ void get_monotonic_boottime(struct timespec *ts)
WARN_ON(timekeeping_suspended);
do {
- seq = read_seqbegin(&xtime_lock);
+ seq = read_seqcount_begin(&xtime_seq);
*ts = xtime;
tomono = wall_to_monotonic;
sleep = total_sleep_time;
nsecs = timekeeping_get_ns();
- } while (read_seqretry(&xtime_lock, seq));
+ } while (read_seqcount_retry(&xtime_seq, seq));
set_normalized_timespec(ts, ts->tv_sec + tomono.tv_sec + sleep.tv_sec,
ts->tv_nsec + tomono.tv_nsec + sleep.tv_nsec + nsecs);
@@ -1158,10 +1170,10 @@ struct timespec current_kernel_time(void)
unsigned long seq;
do {
- seq = read_seqbegin(&xtime_lock);
+ seq = read_seqcount_begin(&xtime_seq);
now = xtime;
- } while (read_seqretry(&xtime_lock, seq));
+ } while (read_seqcount_retry(&xtime_seq, seq));
return now;
}
@@ -1173,11 +1185,11 @@ struct timespec get_monotonic_coarse(void)
unsigned long seq;
do {
- seq = read_seqbegin(&xtime_lock);
+ seq = read_seqcount_begin(&xtime_seq);
now = xtime;
mono = wall_to_monotonic;
- } while (read_seqretry(&xtime_lock, seq));
+ } while (read_seqcount_retry(&xtime_seq, seq));
set_normalized_timespec(&now, now.tv_sec + mono.tv_sec,
now.tv_nsec + mono.tv_nsec);
@@ -1209,11 +1221,11 @@ void get_xtime_and_monotonic_and_sleep_offset(struct timespec *xtim,
unsigned long seq;
do {
- seq = read_seqbegin(&xtime_lock);
+ seq = read_seqcount_begin(&xtime_seq);
*xtim = xtime;
*wtom = wall_to_monotonic;
*sleep = total_sleep_time;
- } while (read_seqretry(&xtime_lock, seq));
+ } while (read_seqcount_retry(&xtime_seq, seq));
}
/**
@@ -1225,9 +1237,9 @@ ktime_t ktime_get_monotonic_offset(void)
struct timespec wtom;
do {
- seq = read_seqbegin(&xtime_lock);
+ seq = read_seqcount_begin(&xtime_seq);
wtom = wall_to_monotonic;
- } while (read_seqretry(&xtime_lock, seq));
+ } while (read_seqcount_retry(&xtime_seq, seq));
return timespec_to_ktime(wtom);
}
@@ -1239,7 +1251,9 @@ ktime_t ktime_get_monotonic_offset(void)
*/
void xtime_update(unsigned long ticks)
{
- write_seqlock(&xtime_lock);
+ raw_spin_lock(&xtime_lock);
+ write_seqcount_begin(&xtime_seq);
do_timer(ticks);
- write_sequnlock(&xtime_lock);
+ write_seqcount_end(&xtime_seq);
+ raw_spin_unlock(&xtime_lock);
}
generated by cgit v1.2.3 (git 2.0.4) at 2024-05-12 15:47:13 +0000