523 lines
16 KiB
Diff
523 lines
16 KiB
Diff
From f66aa661bcd8201092bd9e7f9f1c243627b42fe4 Mon Sep 17 00:00:00 2001
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From: Thomas Gleixner <tglx@linutronix.de>
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Date: Thu, 1 Mar 2012 15:14:06 +0100
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Subject: [012/254] timekeeping: Split xtime_lock
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xtime_lock is going to be split apart in mainline, so we can shorten
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the seqcount protected regions and avoid updating seqcount in some
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code pathes. This is a straight forward split, so we can avoid the
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whole mess with raw seqlocks for RT.
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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---
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kernel/time/jiffies.c | 4 +-
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kernel/time/tick-common.c | 10 ++--
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kernel/time/tick-internal.h | 3 +-
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kernel/time/tick-sched.c | 16 +++---
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kernel/time/timekeeping.c | 114 +++++++++++++++++++++++++------------------
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5 files changed, 87 insertions(+), 60 deletions(-)
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diff --git a/kernel/time/jiffies.c b/kernel/time/jiffies.c
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index a470154..21940eb 100644
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--- a/kernel/time/jiffies.c
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+++ b/kernel/time/jiffies.c
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@@ -74,9 +74,9 @@ u64 get_jiffies_64(void)
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u64 ret;
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do {
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- seq = read_seqbegin(&xtime_lock);
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+ seq = read_seqcount_begin(&xtime_seq);
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ret = jiffies_64;
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- } while (read_seqretry(&xtime_lock, seq));
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+ } while (read_seqcount_retry(&xtime_seq, seq));
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return ret;
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}
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EXPORT_SYMBOL(get_jiffies_64);
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diff --git a/kernel/time/tick-common.c b/kernel/time/tick-common.c
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index da6c9ec..39de540 100644
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--- a/kernel/time/tick-common.c
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+++ b/kernel/time/tick-common.c
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@@ -63,13 +63,15 @@ int tick_is_oneshot_available(void)
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static void tick_periodic(int cpu)
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{
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if (tick_do_timer_cpu == cpu) {
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- write_seqlock(&xtime_lock);
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+ raw_spin_lock(&xtime_lock);
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+ write_seqcount_begin(&xtime_seq);
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/* Keep track of the next tick event */
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tick_next_period = ktime_add(tick_next_period, tick_period);
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do_timer(1);
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- write_sequnlock(&xtime_lock);
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+ write_seqcount_end(&xtime_seq);
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+ raw_spin_unlock(&xtime_lock);
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}
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update_process_times(user_mode(get_irq_regs()));
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@@ -130,9 +132,9 @@ void tick_setup_periodic(struct clock_event_device *dev, int broadcast)
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ktime_t next;
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do {
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- seq = read_seqbegin(&xtime_lock);
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+ seq = read_seqcount_begin(&xtime_seq);
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next = tick_next_period;
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- } while (read_seqretry(&xtime_lock, seq));
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+ } while (read_seqcount_retry(&xtime_seq, seq));
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clockevents_set_mode(dev, CLOCK_EVT_MODE_ONESHOT);
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diff --git a/kernel/time/tick-internal.h b/kernel/time/tick-internal.h
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index 4e265b9..c91100d 100644
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--- a/kernel/time/tick-internal.h
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+++ b/kernel/time/tick-internal.h
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@@ -141,4 +141,5 @@ static inline int tick_device_is_functional(struct clock_event_device *dev)
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#endif
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extern void do_timer(unsigned long ticks);
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-extern seqlock_t xtime_lock;
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+extern raw_spinlock_t xtime_lock;
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+extern seqcount_t xtime_seq;
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diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
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index efd3866..a607a7c 100644
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--- a/kernel/time/tick-sched.c
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+++ b/kernel/time/tick-sched.c
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@@ -56,7 +56,8 @@ static void tick_do_update_jiffies64(ktime_t now)
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return;
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/* Reevalute with xtime_lock held */
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- write_seqlock(&xtime_lock);
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+ raw_spin_lock(&xtime_lock);
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+ write_seqcount_begin(&xtime_seq);
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delta = ktime_sub(now, last_jiffies_update);
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if (delta.tv64 >= tick_period.tv64) {
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@@ -79,7 +80,8 @@ static void tick_do_update_jiffies64(ktime_t now)
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/* Keep the tick_next_period variable up to date */
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tick_next_period = ktime_add(last_jiffies_update, tick_period);
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}
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- write_sequnlock(&xtime_lock);
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+ write_seqcount_end(&xtime_seq);
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+ raw_spin_unlock(&xtime_lock);
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}
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/*
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@@ -89,12 +91,14 @@ static ktime_t tick_init_jiffy_update(void)
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{
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ktime_t period;
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- write_seqlock(&xtime_lock);
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+ raw_spin_lock(&xtime_lock);
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+ write_seqcount_begin(&xtime_seq);
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/* Did we start the jiffies update yet ? */
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if (last_jiffies_update.tv64 == 0)
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last_jiffies_update = tick_next_period;
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period = last_jiffies_update;
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- write_sequnlock(&xtime_lock);
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+ write_seqcount_end(&xtime_seq);
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+ raw_spin_unlock(&xtime_lock);
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return period;
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}
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@@ -316,11 +320,11 @@ static void tick_nohz_stop_sched_tick(struct tick_sched *ts)
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ts->idle_calls++;
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/* Read jiffies and the time when jiffies were updated last */
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do {
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- seq = read_seqbegin(&xtime_lock);
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+ seq = read_seqcount_begin(&xtime_seq);
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last_update = last_jiffies_update;
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last_jiffies = jiffies;
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time_delta = timekeeping_max_deferment();
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- } while (read_seqretry(&xtime_lock, seq));
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+ } while (read_seqcount_retry(&xtime_seq, seq));
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if (rcu_needs_cpu(cpu) || printk_needs_cpu(cpu) ||
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arch_needs_cpu(cpu)) {
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diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
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index d66b213..56e151b 100644
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--- a/kernel/time/timekeeping.c
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+++ b/kernel/time/timekeeping.c
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@@ -70,8 +70,9 @@ struct timekeeper {
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/* The raw monotonic time for the CLOCK_MONOTONIC_RAW posix clock. */
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struct timespec raw_time;
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- /* Seqlock for all timekeeper values */
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- seqlock_t lock;
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+ /* Open coded seqlock for all timekeeper values */
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+ seqcount_t seq;
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+ raw_spinlock_t lock;
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};
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static struct timekeeper timekeeper;
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@@ -80,7 +81,8 @@ static struct timekeeper timekeeper;
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* This read-write spinlock protects us from races in SMP while
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* playing with xtime.
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*/
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-__cacheline_aligned_in_smp DEFINE_SEQLOCK(xtime_lock);
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+__cacheline_aligned_in_smp DEFINE_RAW_SPINLOCK(xtime_lock);
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+seqcount_t xtime_seq;
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/* flag for if timekeeping is suspended */
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@@ -228,7 +230,7 @@ void getnstimeofday(struct timespec *ts)
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WARN_ON(timekeeping_suspended);
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do {
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- seq = read_seqbegin(&timekeeper.lock);
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+ seq = read_seqcount_begin(&timekeeper.seq);
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*ts = timekeeper.xtime;
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nsecs = timekeeping_get_ns();
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@@ -236,7 +238,7 @@ void getnstimeofday(struct timespec *ts)
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/* If arch requires, add in gettimeoffset() */
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nsecs += arch_gettimeoffset();
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- } while (read_seqretry(&timekeeper.lock, seq));
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+ } while (read_seqcount_retry(&timekeeper.seq, seq));
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timespec_add_ns(ts, nsecs);
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}
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@@ -251,7 +253,7 @@ ktime_t ktime_get(void)
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WARN_ON(timekeeping_suspended);
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do {
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- seq = read_seqbegin(&timekeeper.lock);
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+ seq = read_seqcount_begin(&timekeeper.seq);
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secs = timekeeper.xtime.tv_sec +
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timekeeper.wall_to_monotonic.tv_sec;
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nsecs = timekeeper.xtime.tv_nsec +
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@@ -260,7 +262,7 @@ ktime_t ktime_get(void)
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/* If arch requires, add in gettimeoffset() */
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nsecs += arch_gettimeoffset();
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- } while (read_seqretry(&timekeeper.lock, seq));
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+ } while (read_seqcount_retry(&timekeeper.seq, seq));
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/*
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* Use ktime_set/ktime_add_ns to create a proper ktime on
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* 32-bit architectures without CONFIG_KTIME_SCALAR.
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@@ -286,14 +288,14 @@ void ktime_get_ts(struct timespec *ts)
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WARN_ON(timekeeping_suspended);
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do {
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- seq = read_seqbegin(&timekeeper.lock);
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+ seq = read_seqcount_begin(&timekeeper.seq);
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*ts = timekeeper.xtime;
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tomono = timekeeper.wall_to_monotonic;
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nsecs = timekeeping_get_ns();
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/* If arch requires, add in gettimeoffset() */
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nsecs += arch_gettimeoffset();
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- } while (read_seqretry(&timekeeper.lock, seq));
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+ } while (read_seqcount_retry(&timekeeper.seq, seq));
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set_normalized_timespec(ts, ts->tv_sec + tomono.tv_sec,
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ts->tv_nsec + tomono.tv_nsec + nsecs);
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@@ -321,7 +323,7 @@ void getnstime_raw_and_real(struct timespec *ts_raw, struct timespec *ts_real)
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do {
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u32 arch_offset;
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- seq = read_seqbegin(&timekeeper.lock);
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+ seq = read_seqcount_begin(&timekeeper.seq);
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*ts_raw = timekeeper.raw_time;
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*ts_real = timekeeper.xtime;
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@@ -334,7 +336,7 @@ void getnstime_raw_and_real(struct timespec *ts_raw, struct timespec *ts_real)
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nsecs_raw += arch_offset;
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nsecs_real += arch_offset;
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- } while (read_seqretry(&timekeeper.lock, seq));
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+ } while (read_seqcount_retry(&timekeeper.seq, seq));
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timespec_add_ns(ts_raw, nsecs_raw);
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timespec_add_ns(ts_real, nsecs_real);
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@@ -373,7 +375,8 @@ int do_settimeofday(const struct timespec *tv)
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if ((unsigned long)tv->tv_nsec >= NSEC_PER_SEC)
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return -EINVAL;
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- write_seqlock_irqsave(&timekeeper.lock, flags);
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+ raw_spin_lock_irqsave(&timekeeper.lock, flags);
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+ write_seqcount_begin(&timekeeper.seq);
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timekeeping_forward_now();
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@@ -385,7 +388,8 @@ int do_settimeofday(const struct timespec *tv)
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timekeeper.xtime = *tv;
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timekeeping_update(true);
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- write_sequnlock_irqrestore(&timekeeper.lock, flags);
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+ write_seqcount_end(&timekeeper.seq);
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+ raw_spin_unlock_irqrestore(&timekeeper.lock, flags);
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/* signal hrtimers about time change */
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clock_was_set();
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@@ -409,7 +413,8 @@ int timekeeping_inject_offset(struct timespec *ts)
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if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC)
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return -EINVAL;
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- write_seqlock_irqsave(&timekeeper.lock, flags);
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+ raw_spin_lock_irqsave(&timekeeper.lock, flags);
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+ write_seqcount_begin(&timekeeper.seq);
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timekeeping_forward_now();
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@@ -419,7 +424,8 @@ int timekeeping_inject_offset(struct timespec *ts)
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timekeeping_update(true);
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- write_sequnlock_irqrestore(&timekeeper.lock, flags);
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+ write_seqcount_end(&timekeeper.seq);
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+ raw_spin_unlock_irqrestore(&timekeeper.lock, flags);
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/* signal hrtimers about time change */
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clock_was_set();
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@@ -440,7 +446,8 @@ static int change_clocksource(void *data)
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new = (struct clocksource *) data;
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- write_seqlock_irqsave(&timekeeper.lock, flags);
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+ raw_spin_lock_irqsave(&timekeeper.lock, flags);
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+ write_seqcount_begin(&timekeeper.seq);
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timekeeping_forward_now();
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if (!new->enable || new->enable(new) == 0) {
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@@ -451,7 +458,8 @@ static int change_clocksource(void *data)
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}
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timekeeping_update(true);
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- write_sequnlock_irqrestore(&timekeeper.lock, flags);
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+ write_seqcount_end(&timekeeper.seq);
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+ raw_spin_unlock_irqrestore(&timekeeper.lock, flags);
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return 0;
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}
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@@ -498,11 +506,11 @@ void getrawmonotonic(struct timespec *ts)
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s64 nsecs;
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do {
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- seq = read_seqbegin(&timekeeper.lock);
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+ seq = read_seqcount_begin(&timekeeper.seq);
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nsecs = timekeeping_get_ns_raw();
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*ts = timekeeper.raw_time;
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- } while (read_seqretry(&timekeeper.lock, seq));
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+ } while (read_seqcount_retry(&timekeeper.seq, seq));
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timespec_add_ns(ts, nsecs);
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}
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@@ -518,11 +526,11 @@ int timekeeping_valid_for_hres(void)
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int ret;
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do {
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- seq = read_seqbegin(&timekeeper.lock);
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+ seq = read_seqcount_begin(&timekeeper.seq);
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ret = timekeeper.clock->flags & CLOCK_SOURCE_VALID_FOR_HRES;
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- } while (read_seqretry(&timekeeper.lock, seq));
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+ } while (read_seqcount_retry(&timekeeper.seq, seq));
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return ret;
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}
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@@ -535,11 +543,11 @@ u64 timekeeping_max_deferment(void)
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unsigned long seq;
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u64 ret;
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do {
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- seq = read_seqbegin(&timekeeper.lock);
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+ seq = read_seqcount_begin(&timekeeper.seq);
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ret = timekeeper.clock->max_idle_ns;
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- } while (read_seqretry(&timekeeper.lock, seq));
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+ } while (read_seqcount_retry(&timekeeper.seq, seq));
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return ret;
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}
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@@ -586,11 +594,13 @@ void __init timekeeping_init(void)
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read_persistent_clock(&now);
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read_boot_clock(&boot);
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- seqlock_init(&timekeeper.lock);
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+ raw_spin_lock_init(&timekeeper.lock);
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+ seqcount_init(&timekeeper.seq);
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ntp_init();
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- write_seqlock_irqsave(&timekeeper.lock, flags);
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+ raw_spin_lock_irqsave(&timekeeper.lock, flags);
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+ write_seqcount_begin(&timekeeper.seq);
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clock = clocksource_default_clock();
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if (clock->enable)
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clock->enable(clock);
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@@ -608,7 +618,8 @@ void __init timekeeping_init(void)
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-boot.tv_sec, -boot.tv_nsec);
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timekeeper.total_sleep_time.tv_sec = 0;
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timekeeper.total_sleep_time.tv_nsec = 0;
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- write_sequnlock_irqrestore(&timekeeper.lock, flags);
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+ write_seqcount_end(&timekeeper.seq);
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+ raw_spin_unlock_irqrestore(&timekeeper.lock, flags);
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}
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/* time in seconds when suspend began */
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@@ -657,7 +668,8 @@ void timekeeping_inject_sleeptime(struct timespec *delta)
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if (!(ts.tv_sec == 0 && ts.tv_nsec == 0))
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return;
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- write_seqlock_irqsave(&timekeeper.lock, flags);
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+ raw_spin_lock_irqsave(&timekeeper.lock, flags);
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+ write_seqcount_begin(&timekeeper.seq);
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timekeeping_forward_now();
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@@ -665,7 +677,8 @@ void timekeeping_inject_sleeptime(struct timespec *delta)
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timekeeping_update(true);
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- write_sequnlock_irqrestore(&timekeeper.lock, flags);
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+ write_seqcount_end(&timekeeper.seq);
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+ raw_spin_unlock_irqrestore(&timekeeper.lock, flags);
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/* signal hrtimers about time change */
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clock_was_set();
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@@ -688,7 +701,8 @@ static void timekeeping_resume(void)
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clocksource_resume();
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- write_seqlock_irqsave(&timekeeper.lock, flags);
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+ raw_spin_lock_irqsave(&timekeeper.lock, flags);
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+ write_seqcount_begin(&timekeeper.seq);
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if (timespec_compare(&ts, &timekeeping_suspend_time) > 0) {
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ts = timespec_sub(ts, timekeeping_suspend_time);
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@@ -698,7 +712,8 @@ static void timekeeping_resume(void)
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timekeeper.clock->cycle_last = timekeeper.clock->read(timekeeper.clock);
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timekeeper.ntp_error = 0;
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timekeeping_suspended = 0;
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- write_sequnlock_irqrestore(&timekeeper.lock, flags);
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+ write_seqcount_end(&timekeeper.seq);
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+ raw_spin_unlock_irqrestore(&timekeeper.lock, flags);
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touch_softlockup_watchdog();
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@@ -716,7 +731,8 @@ static int timekeeping_suspend(void)
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read_persistent_clock(&timekeeping_suspend_time);
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- write_seqlock_irqsave(&timekeeper.lock, flags);
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+ raw_spin_lock_irqsave(&timekeeper.lock, flags);
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+ write_seqcount_begin(&timekeeper.seq);
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timekeeping_forward_now();
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timekeeping_suspended = 1;
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@@ -739,7 +755,8 @@ static int timekeeping_suspend(void)
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timekeeping_suspend_time =
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timespec_add(timekeeping_suspend_time, delta_delta);
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}
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- write_sequnlock_irqrestore(&timekeeper.lock, flags);
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+ write_seqcount_end(&timekeeper.seq);
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+ raw_spin_unlock_irqrestore(&timekeeper.lock, flags);
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clockevents_notify(CLOCK_EVT_NOTIFY_SUSPEND, NULL);
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clocksource_suspend();
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@@ -997,7 +1014,8 @@ static void update_wall_time(void)
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int shift = 0, maxshift;
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unsigned long flags;
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- write_seqlock_irqsave(&timekeeper.lock, flags);
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+ raw_spin_lock_irqsave(&timekeeper.lock, flags);
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+ write_seqcount_begin(&timekeeper.seq);
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/* Make sure we're fully resumed: */
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if (unlikely(timekeeping_suspended))
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@@ -1084,8 +1102,8 @@ static void update_wall_time(void)
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timekeeping_update(false);
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out:
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- write_sequnlock_irqrestore(&timekeeper.lock, flags);
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-
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+ write_seqcount_end(&timekeeper.seq);
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+ raw_spin_unlock_irqrestore(&timekeeper.lock, flags);
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}
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/**
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@@ -1131,13 +1149,13 @@ void get_monotonic_boottime(struct timespec *ts)
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WARN_ON(timekeeping_suspended);
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do {
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- seq = read_seqbegin(&timekeeper.lock);
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+ seq = read_seqcount_begin(&timekeeper.seq);
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*ts = timekeeper.xtime;
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tomono = timekeeper.wall_to_monotonic;
|
|
sleep = timekeeper.total_sleep_time;
|
|
nsecs = timekeeping_get_ns();
|
|
|
|
- } while (read_seqretry(&timekeeper.lock, seq));
|
|
+ } while (read_seqcount_retry(&timekeeper.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);
|
|
@@ -1188,10 +1206,10 @@ struct timespec current_kernel_time(void)
|
|
unsigned long seq;
|
|
|
|
do {
|
|
- seq = read_seqbegin(&timekeeper.lock);
|
|
+ seq = read_seqcount_begin(&timekeeper.seq);
|
|
|
|
now = timekeeper.xtime;
|
|
- } while (read_seqretry(&timekeeper.lock, seq));
|
|
+ } while (read_seqcount_retry(&timekeeper.seq, seq));
|
|
|
|
return now;
|
|
}
|
|
@@ -1203,11 +1221,11 @@ struct timespec get_monotonic_coarse(void)
|
|
unsigned long seq;
|
|
|
|
do {
|
|
- seq = read_seqbegin(&timekeeper.lock);
|
|
+ seq = read_seqcount_begin(&timekeeper.seq);
|
|
|
|
now = timekeeper.xtime;
|
|
mono = timekeeper.wall_to_monotonic;
|
|
- } while (read_seqretry(&timekeeper.lock, seq));
|
|
+ } while (read_seqcount_retry(&timekeeper.seq, seq));
|
|
|
|
set_normalized_timespec(&now, now.tv_sec + mono.tv_sec,
|
|
now.tv_nsec + mono.tv_nsec);
|
|
@@ -1239,11 +1257,11 @@ void get_xtime_and_monotonic_and_sleep_offset(struct timespec *xtim,
|
|
unsigned long seq;
|
|
|
|
do {
|
|
- seq = read_seqbegin(&timekeeper.lock);
|
|
+ seq = read_seqcount_begin(&timekeeper.seq);
|
|
*xtim = timekeeper.xtime;
|
|
*wtom = timekeeper.wall_to_monotonic;
|
|
*sleep = timekeeper.total_sleep_time;
|
|
- } while (read_seqretry(&timekeeper.lock, seq));
|
|
+ } while (read_seqcount_retry(&timekeeper.seq, seq));
|
|
}
|
|
|
|
/**
|
|
@@ -1255,9 +1273,9 @@ ktime_t ktime_get_monotonic_offset(void)
|
|
struct timespec wtom;
|
|
|
|
do {
|
|
- seq = read_seqbegin(&timekeeper.lock);
|
|
+ seq = read_seqcount_begin(&timekeeper.seq);
|
|
wtom = timekeeper.wall_to_monotonic;
|
|
- } while (read_seqretry(&timekeeper.lock, seq));
|
|
+ } while (read_seqcount_retry(&timekeeper.seq, seq));
|
|
|
|
return timespec_to_ktime(wtom);
|
|
}
|
|
@@ -1272,7 +1290,9 @@ EXPORT_SYMBOL_GPL(ktime_get_monotonic_offset);
|
|
*/
|
|
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);
|
|
}
|