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-rw-r--r--kernel/time/alarmtimer.c8
-rw-r--r--kernel/time/clocksource.c11
-rw-r--r--kernel/time/hrtimer.c11
-rw-r--r--kernel/time/ntp.c4
-rw-r--r--kernel/time/timer.c8
-rw-r--r--kernel/time/timer_list.c36
-rw-r--r--kernel/time/timer_stats.c2
7 files changed, 48 insertions, 32 deletions
diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c
index a0ee81f49a87..6aef4a0bed29 100644
--- a/kernel/time/alarmtimer.c
+++ b/kernel/time/alarmtimer.c
@@ -544,7 +544,7 @@ static int alarm_timer_create(struct k_itimer *new_timer)
enum alarmtimer_type type;
if (!alarmtimer_get_rtcdev())
- return -ENOTSUPP;
+ return -EOPNOTSUPP;
if (!capable(CAP_WAKE_ALARM))
return -EPERM;
@@ -586,7 +586,7 @@ static void alarm_timer_get(struct k_itimer *timr,
static int alarm_timer_del(struct k_itimer *timr)
{
if (!rtcdev)
- return -ENOTSUPP;
+ return -EOPNOTSUPP;
if (alarm_try_to_cancel(&timr->it.alarm.alarmtimer) < 0)
return TIMER_RETRY;
@@ -610,7 +610,7 @@ static int alarm_timer_set(struct k_itimer *timr, int flags,
ktime_t exp;
if (!rtcdev)
- return -ENOTSUPP;
+ return -EOPNOTSUPP;
if (flags & ~TIMER_ABSTIME)
return -EINVAL;
@@ -772,7 +772,7 @@ static int alarm_timer_nsleep(const clockid_t which_clock, int flags,
struct restart_block *restart;
if (!alarmtimer_get_rtcdev())
- return -ENOTSUPP;
+ return -EOPNOTSUPP;
if (flags & ~TIMER_ABSTIME)
return -EINVAL;
diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index 7e4fad75acaa..2924ff544c9e 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -272,8 +272,15 @@ static void clocksource_watchdog(unsigned long data)
next_cpu = cpumask_next(raw_smp_processor_id(), cpu_online_mask);
if (next_cpu >= nr_cpu_ids)
next_cpu = cpumask_first(cpu_online_mask);
- watchdog_timer.expires += WATCHDOG_INTERVAL;
- add_timer_on(&watchdog_timer, next_cpu);
+
+ /*
+ * Arm timer if not already pending: could race with concurrent
+ * pair clocksource_stop_watchdog() clocksource_start_watchdog().
+ */
+ if (!timer_pending(&watchdog_timer)) {
+ watchdog_timer.expires += WATCHDOG_INTERVAL;
+ add_timer_on(&watchdog_timer, next_cpu);
+ }
out:
spin_unlock(&watchdog_lock);
}
diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
index c93729661be0..f31637ced7fa 100644
--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -870,7 +870,8 @@ static int enqueue_hrtimer(struct hrtimer *timer,
base->cpu_base->active_bases |= 1 << base->index;
- timer->state = HRTIMER_STATE_ENQUEUED;
+ /* Pairs with the lockless read in hrtimer_is_queued() */
+ WRITE_ONCE(timer->state, HRTIMER_STATE_ENQUEUED);
return timerqueue_add(&base->active, &timer->node);
}
@@ -892,7 +893,8 @@ static void __remove_hrtimer(struct hrtimer *timer,
struct hrtimer_cpu_base *cpu_base = base->cpu_base;
u8 state = timer->state;
- timer->state = newstate;
+ /* Pairs with the lockless read in hrtimer_is_queued() */
+ WRITE_ONCE(timer->state, newstate);
if (!(state & HRTIMER_STATE_ENQUEUED))
return;
@@ -919,8 +921,9 @@ static void __remove_hrtimer(struct hrtimer *timer,
static inline int
remove_hrtimer(struct hrtimer *timer, struct hrtimer_clock_base *base, bool restart)
{
- if (hrtimer_is_queued(timer)) {
- u8 state = timer->state;
+ u8 state = timer->state;
+
+ if (state & HRTIMER_STATE_ENQUEUED) {
int reprogram;
/*
diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index 6df8927c58a5..4bdb59604526 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -42,6 +42,7 @@ static u64 tick_length_base;
#define MAX_TICKADJ 500LL /* usecs */
#define MAX_TICKADJ_SCALED \
(((MAX_TICKADJ * NSEC_PER_USEC) << NTP_SCALE_SHIFT) / NTP_INTERVAL_FREQ)
+#define MAX_TAI_OFFSET 100000
/*
* phase-lock loop variables
@@ -639,7 +640,8 @@ static inline void process_adjtimex_modes(struct timex *txc,
time_constant = max(time_constant, 0l);
}
- if (txc->modes & ADJ_TAI && txc->constant > 0)
+ if (txc->modes & ADJ_TAI &&
+ txc->constant >= 0 && txc->constant <= MAX_TAI_OFFSET)
*time_tai = txc->constant;
if (txc->modes & ADJ_OFFSET)
diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index b625cc7fcc1c..b5603248d841 100644
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -1586,21 +1586,23 @@ void timer_clear_idle(void)
static int collect_expired_timers(struct timer_base *base,
struct hlist_head *heads)
{
+ unsigned long now = READ_ONCE(jiffies);
+
/*
* NOHZ optimization. After a long idle sleep we need to forward the
* base to current jiffies. Avoid a loop by searching the bitfield for
* the next expiring timer.
*/
- if ((long)(jiffies - base->clk) > 2) {
+ if ((long)(now - base->clk) > 2) {
unsigned long next = __next_timer_interrupt(base);
/*
* If the next timer is ahead of time forward to current
* jiffies, otherwise forward to the next expiry time:
*/
- if (time_after(next, jiffies)) {
+ if (time_after(next, now)) {
/* The call site will increment clock! */
- base->clk = jiffies - 1;
+ base->clk = now - 1;
return 0;
}
base->clk = next;
diff --git a/kernel/time/timer_list.c b/kernel/time/timer_list.c
index 1407ed20ea93..b7c5d230b4b2 100644
--- a/kernel/time/timer_list.c
+++ b/kernel/time/timer_list.c
@@ -299,23 +299,6 @@ static inline void timer_list_header(struct seq_file *m, u64 now)
SEQ_printf(m, "\n");
}
-static int timer_list_show(struct seq_file *m, void *v)
-{
- struct timer_list_iter *iter = v;
-
- if (iter->cpu == -1 && !iter->second_pass)
- timer_list_header(m, iter->now);
- else if (!iter->second_pass)
- print_cpu(m, iter->cpu, iter->now);
-#ifdef CONFIG_GENERIC_CLOCKEVENTS
- else if (iter->cpu == -1 && iter->second_pass)
- timer_list_show_tickdevices_header(m);
- else
- print_tickdevice(m, tick_get_device(iter->cpu), iter->cpu);
-#endif
- return 0;
-}
-
void sysrq_timer_list_show(void)
{
u64 now = ktime_to_ns(ktime_get());
@@ -334,6 +317,24 @@ void sysrq_timer_list_show(void)
return;
}
+#ifdef CONFIG_PROC_FS
+static int timer_list_show(struct seq_file *m, void *v)
+{
+ struct timer_list_iter *iter = v;
+
+ if (iter->cpu == -1 && !iter->second_pass)
+ timer_list_header(m, iter->now);
+ else if (!iter->second_pass)
+ print_cpu(m, iter->cpu, iter->now);
+#ifdef CONFIG_GENERIC_CLOCKEVENTS
+ else if (iter->cpu == -1 && iter->second_pass)
+ timer_list_show_tickdevices_header(m);
+ else
+ print_tickdevice(m, tick_get_device(iter->cpu), iter->cpu);
+#endif
+ return 0;
+}
+
static void *move_iter(struct timer_list_iter *iter, loff_t offset)
{
for (; offset; offset--) {
@@ -405,3 +406,4 @@ static int __init init_timer_list_procfs(void)
return 0;
}
__initcall(init_timer_list_procfs);
+#endif
diff --git a/kernel/time/timer_stats.c b/kernel/time/timer_stats.c
index 087204c733eb..c74920f318c5 100644
--- a/kernel/time/timer_stats.c
+++ b/kernel/time/timer_stats.c
@@ -417,7 +417,7 @@ static int __init init_tstats_procfs(void)
{
struct proc_dir_entry *pe;
- pe = proc_create("timer_stats", 0644, NULL, &tstats_fops);
+ pe = proc_create("timer_stats", 0600, NULL, &tstats_fops);
if (!pe)
return -ENOMEM;
return 0;
generated by cgit v1.2.3 (git 2.0.4) at 2024-06-08 02:16:11 +0000