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-rw-r--r--fs/timerfd.c10
-rw-r--r--include/linux/alarmtimer.h6
-rw-r--r--include/linux/time.h15
-rw-r--r--kernel/time/alarmtimer.c1
-rw-r--r--kernel/time/clocksource.c8
-rw-r--r--kernel/time/hrtimer.c2
-rw-r--r--kernel/time/test_udelay.c16
-rw-r--r--kernel/time/tick-broadcast-hrtimer.c1
-rw-r--r--kernel/time/tick-sched.c50
-rw-r--r--kernel/time/timeconv.c11
-rw-r--r--kernel/time/timekeeping.c10
-rw-r--r--kernel/time/timer.c8
-rw-r--r--kernel/time/timer_stats.c6
13 files changed, 89 insertions, 55 deletions
diff --git a/fs/timerfd.c b/fs/timerfd.c
index 053818dd6c18..9ae4abb4110b 100644
--- a/fs/timerfd.c
+++ b/fs/timerfd.c
@@ -390,6 +390,11 @@ SYSCALL_DEFINE2(timerfd_create, int, clockid, int, flags)
clockid != CLOCK_BOOTTIME_ALARM))
return -EINVAL;
+ if (!capable(CAP_WAKE_ALARM) &&
+ (clockid == CLOCK_REALTIME_ALARM ||
+ clockid == CLOCK_BOOTTIME_ALARM))
+ return -EPERM;
+
ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return -ENOMEM;
@@ -433,6 +438,11 @@ static int do_timerfd_settime(int ufd, int flags,
return ret;
ctx = f.file->private_data;
+ if (!capable(CAP_WAKE_ALARM) && isalarm(ctx)) {
+ fdput(f);
+ return -EPERM;
+ }
+
timerfd_setup_cancel(ctx, flags);
/*
diff --git a/include/linux/alarmtimer.h b/include/linux/alarmtimer.h
index 52f3b7da4f2d..9d8031257a90 100644
--- a/include/linux/alarmtimer.h
+++ b/include/linux/alarmtimer.h
@@ -26,10 +26,10 @@ enum alarmtimer_restart {
* struct alarm - Alarm timer structure
* @node: timerqueue node for adding to the event list this value
* also includes the expiration time.
- * @period: Period for recuring alarms
+ * @timer: hrtimer used to schedule events while running
* @function: Function pointer to be executed when the timer fires.
- * @type: Alarm type (BOOTTIME/REALTIME)
- * @enabled: Flag that represents if the alarm is set to fire or not
+ * @type: Alarm type (BOOTTIME/REALTIME).
+ * @state: Flag that represents if the alarm is set to fire or not.
* @data: Internal data value.
*/
struct alarm {
diff --git a/include/linux/time.h b/include/linux/time.h
index 297f09f23896..4cea09d94208 100644
--- a/include/linux/time.h
+++ b/include/linux/time.h
@@ -205,7 +205,20 @@ struct tm {
int tm_yday;
};
-void time_to_tm(time_t totalsecs, int offset, struct tm *result);
+void time64_to_tm(time64_t totalsecs, int offset, struct tm *result);
+
+/**
+ * time_to_tm - converts the calendar time to local broken-down time
+ *
+ * @totalsecs the number of seconds elapsed since 00:00:00 on January 1, 1970,
+ * Coordinated Universal Time (UTC).
+ * @offset offset seconds adding to totalsecs.
+ * @result pointer to struct tm variable to receive broken-down time
+ */
+static inline void time_to_tm(time_t totalsecs, int offset, struct tm *result)
+{
+ time64_to_tm(totalsecs, offset, result);
+}
/**
* timespec_to_ns - Convert timespec to nanoseconds
diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c
index e840ed867a5d..c3aad685bbc0 100644
--- a/kernel/time/alarmtimer.c
+++ b/kernel/time/alarmtimer.c
@@ -30,7 +30,6 @@
* struct alarm_base - Alarm timer bases
* @lock: Lock for syncrhonized access to the base
* @timerqueue: Timerqueue head managing the list of events
- * @timer: hrtimer used to schedule events while running
* @gettime: Function to read the time correlating to the base
* @base_clockid: clockid for the base
*/
diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index 56ece145a814..6a5a310a1a53 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -669,10 +669,12 @@ static void clocksource_enqueue(struct clocksource *cs)
struct list_head *entry = &clocksource_list;
struct clocksource *tmp;
- list_for_each_entry(tmp, &clocksource_list, list)
+ list_for_each_entry(tmp, &clocksource_list, list) {
/* Keep track of the place, where to insert */
- if (tmp->rating >= cs->rating)
- entry = &tmp->list;
+ if (tmp->rating < cs->rating)
+ break;
+ entry = &tmp->list;
+ }
list_add(&cs->list, entry);
}
diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
index e99df0ff1d42..d13c9aebf7a3 100644
--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -177,7 +177,7 @@ hrtimer_check_target(struct hrtimer *timer, struct hrtimer_clock_base *new_base)
#endif
}
-#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
+#ifdef CONFIG_NO_HZ_COMMON
static inline
struct hrtimer_cpu_base *get_target_base(struct hrtimer_cpu_base *base,
int pinned)
diff --git a/kernel/time/test_udelay.c b/kernel/time/test_udelay.c
index e622ba365a13..b0928ab3270f 100644
--- a/kernel/time/test_udelay.c
+++ b/kernel/time/test_udelay.c
@@ -43,13 +43,13 @@ static int udelay_test_single(struct seq_file *s, int usecs, uint32_t iters)
int allowed_error_ns = usecs * 5;
for (i = 0; i < iters; ++i) {
- struct timespec ts1, ts2;
+ s64 kt1, kt2;
int time_passed;
- ktime_get_ts(&ts1);
+ kt1 = ktime_get_ns();
udelay(usecs);
- ktime_get_ts(&ts2);
- time_passed = timespec_to_ns(&ts2) - timespec_to_ns(&ts1);
+ kt2 = ktime_get_ns();
+ time_passed = kt2 - kt1;
if (i == 0 || time_passed < min)
min = time_passed;
@@ -87,11 +87,11 @@ static int udelay_test_show(struct seq_file *s, void *v)
if (usecs > 0 && iters > 0) {
return udelay_test_single(s, usecs, iters);
} else if (usecs == 0) {
- struct timespec ts;
+ struct timespec64 ts;
- ktime_get_ts(&ts);
- seq_printf(s, "udelay() test (lpj=%ld kt=%ld.%09ld)\n",
- loops_per_jiffy, ts.tv_sec, ts.tv_nsec);
+ ktime_get_ts64(&ts);
+ seq_printf(s, "udelay() test (lpj=%ld kt=%lld.%09ld)\n",
+ loops_per_jiffy, (s64)ts.tv_sec, ts.tv_nsec);
seq_puts(s, "usage:\n");
seq_puts(s, "echo USECS [ITERS] > " DEBUGFS_FILENAME "\n");
seq_puts(s, "cat " DEBUGFS_FILENAME "\n");
diff --git a/kernel/time/tick-broadcast-hrtimer.c b/kernel/time/tick-broadcast-hrtimer.c
index 53d7184da0be..690b797f522e 100644
--- a/kernel/time/tick-broadcast-hrtimer.c
+++ b/kernel/time/tick-broadcast-hrtimer.c
@@ -75,6 +75,7 @@ static int bc_set_next(ktime_t expires, struct clock_event_device *bc)
}
static struct clock_event_device ce_broadcast_hrtimer = {
+ .name = "bc_hrtimer",
.set_state_shutdown = bc_shutdown,
.set_next_ktime = bc_set_next,
.features = CLOCK_EVT_FEAT_ONESHOT |
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 5d81f9aa30d2..2ec7c00228f3 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -31,7 +31,7 @@
#include <trace/events/timer.h>
/*
- * Per cpu nohz control structure
+ * Per-CPU nohz control structure
*/
static DEFINE_PER_CPU(struct tick_sched, tick_cpu_sched);
@@ -61,7 +61,7 @@ static void tick_do_update_jiffies64(ktime_t now)
if (delta.tv64 < tick_period.tv64)
return;
- /* Reevalute with jiffies_lock held */
+ /* Reevaluate with jiffies_lock held */
write_seqlock(&jiffies_lock);
delta = ktime_sub(now, last_jiffies_update);
@@ -116,8 +116,8 @@ static void tick_sched_do_timer(ktime_t now)
#ifdef CONFIG_NO_HZ_COMMON
/*
* Check if the do_timer duty was dropped. We don't care about
- * concurrency: This happens only when the cpu in charge went
- * into a long sleep. If two cpus happen to assign themself to
+ * concurrency: This happens only when the CPU in charge went
+ * into a long sleep. If two CPUs happen to assign themselves to
* this duty, then the jiffies update is still serialized by
* jiffies_lock.
*/
@@ -349,7 +349,7 @@ void tick_nohz_dep_clear_signal(struct signal_struct *sig, enum tick_dep_bits bi
/*
* Re-evaluate the need for the tick as we switch the current task.
* It might need the tick due to per task/process properties:
- * perf events, posix cpu timers, ...
+ * perf events, posix CPU timers, ...
*/
void __tick_nohz_task_switch(void)
{
@@ -509,8 +509,8 @@ int tick_nohz_tick_stopped(void)
*
* In case the sched_tick was stopped on this CPU, we have to check if jiffies
* must be updated. Otherwise an interrupt handler could use a stale jiffy
- * value. We do this unconditionally on any cpu, as we don't know whether the
- * cpu, which has the update task assigned is in a long sleep.
+ * value. We do this unconditionally on any CPU, as we don't know whether the
+ * CPU, which has the update task assigned is in a long sleep.
*/
static void tick_nohz_update_jiffies(ktime_t now)
{
@@ -526,7 +526,7 @@ static void tick_nohz_update_jiffies(ktime_t now)
}
/*
- * Updates the per cpu time idle statistics counters
+ * Updates the per-CPU time idle statistics counters
*/
static void
update_ts_time_stats(int cpu, struct tick_sched *ts, ktime_t now, u64 *last_update_time)
@@ -566,12 +566,12 @@ static ktime_t tick_nohz_start_idle(struct tick_sched *ts)
}
/**
- * get_cpu_idle_time_us - get the total idle time of a cpu
+ * get_cpu_idle_time_us - get the total idle time of a CPU
* @cpu: CPU number to query
* @last_update_time: variable to store update time in. Do not update
* counters if NULL.
*
- * Return the cummulative idle time (since boot) for a given
+ * Return the cumulative idle time (since boot) for a given
* CPU, in microseconds.
*
* This time is measured via accounting rather than sampling,
@@ -607,12 +607,12 @@ u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time)
EXPORT_SYMBOL_GPL(get_cpu_idle_time_us);
/**
- * get_cpu_iowait_time_us - get the total iowait time of a cpu
+ * get_cpu_iowait_time_us - get the total iowait time of a CPU
* @cpu: CPU number to query
* @last_update_time: variable to store update time in. Do not update
* counters if NULL.
*
- * Return the cummulative iowait time (since boot) for a given
+ * Return the cumulative iowait time (since boot) for a given
* CPU, in microseconds.
*
* This time is measured via accounting rather than sampling,
@@ -732,14 +732,14 @@ static ktime_t tick_nohz_stop_sched_tick(struct tick_sched *ts,
}
/*
- * If this cpu is the one which updates jiffies, then give up
- * the assignment and let it be taken by the cpu which runs
- * the tick timer next, which might be this cpu as well. If we
+ * If this CPU is the one which updates jiffies, then give up
+ * the assignment and let it be taken by the CPU which runs
+ * the tick timer next, which might be this CPU as well. If we
* don't drop this here the jiffies might be stale and
* do_timer() never invoked. Keep track of the fact that it
- * was the one which had the do_timer() duty last. If this cpu
+ * was the one which had the do_timer() duty last. If this CPU
* is the one which had the do_timer() duty last, we limit the
- * sleep time to the timekeeping max_deferement value.
+ * sleep time to the timekeeping max_deferment value.
* Otherwise we can sleep as long as we want.
*/
delta = timekeeping_max_deferment();
@@ -853,9 +853,9 @@ static void tick_nohz_full_update_tick(struct tick_sched *ts)
static bool can_stop_idle_tick(int cpu, struct tick_sched *ts)
{
/*
- * If this cpu is offline and it is the one which updates
+ * If this CPU is offline and it is the one which updates
* jiffies, then give up the assignment and let it be taken by
- * the cpu which runs the tick timer next. If we don't drop
+ * the CPU which runs the tick timer next. If we don't drop
* this here the jiffies might be stale and do_timer() never
* invoked.
*/
@@ -945,11 +945,11 @@ void tick_nohz_idle_enter(void)
WARN_ON_ONCE(irqs_disabled());
/*
- * Update the idle state in the scheduler domain hierarchy
- * when tick_nohz_stop_sched_tick() is called from the idle loop.
- * State will be updated to busy during the first busy tick after
- * exiting idle.
- */
+ * Update the idle state in the scheduler domain hierarchy
+ * when tick_nohz_stop_sched_tick() is called from the idle loop.
+ * State will be updated to busy during the first busy tick after
+ * exiting idle.
+ */
set_cpu_sd_state_idle();
local_irq_disable();
@@ -1192,7 +1192,7 @@ void tick_setup_sched_timer(void)
hrtimer_init(&ts->sched_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
ts->sched_timer.function = tick_sched_timer;
- /* Get the next period (per cpu) */
+ /* Get the next period (per-CPU) */
hrtimer_set_expires(&ts->sched_timer, tick_init_jiffy_update());
/* Offset the tick to avert jiffies_lock contention. */
diff --git a/kernel/time/timeconv.c b/kernel/time/timeconv.c
index 86628e755f38..7142580ad94f 100644
--- a/kernel/time/timeconv.c
+++ b/kernel/time/timeconv.c
@@ -67,20 +67,21 @@ static const unsigned short __mon_yday[2][13] = {
#define SECS_PER_DAY (SECS_PER_HOUR * 24)
/**
- * time_to_tm - converts the calendar time to local broken-down time
+ * time64_to_tm - converts the calendar time to local broken-down time
*
* @totalsecs the number of seconds elapsed since 00:00:00 on January 1, 1970,
* Coordinated Universal Time (UTC).
* @offset offset seconds adding to totalsecs.
* @result pointer to struct tm variable to receive broken-down time
*/
-void time_to_tm(time_t totalsecs, int offset, struct tm *result)
+void time64_to_tm(time64_t totalsecs, int offset, struct tm *result)
{
long days, rem, y;
+ int remainder;
const unsigned short *ip;
- days = totalsecs / SECS_PER_DAY;
- rem = totalsecs % SECS_PER_DAY;
+ days = div_s64_rem(totalsecs, SECS_PER_DAY, &remainder);
+ rem = remainder;
rem += offset;
while (rem < 0) {
rem += SECS_PER_DAY;
@@ -124,4 +125,4 @@ void time_to_tm(time_t totalsecs, int offset, struct tm *result)
result->tm_mon = y;
result->tm_mday = days + 1;
}
-EXPORT_SYMBOL(time_to_tm);
+EXPORT_SYMBOL(time64_to_tm);
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 479d25cd3d4f..a196e08324e7 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -480,10 +480,12 @@ static inline void old_vsyscall_fixup(struct timekeeper *tk)
* users are removed, this can be killed.
*/
remainder = tk->tkr_mono.xtime_nsec & ((1ULL << tk->tkr_mono.shift) - 1);
- tk->tkr_mono.xtime_nsec -= remainder;
- tk->tkr_mono.xtime_nsec += 1ULL << tk->tkr_mono.shift;
- tk->ntp_error += remainder << tk->ntp_error_shift;
- tk->ntp_error -= (1ULL << tk->tkr_mono.shift) << tk->ntp_error_shift;
+ if (remainder != 0) {
+ tk->tkr_mono.xtime_nsec -= remainder;
+ tk->tkr_mono.xtime_nsec += 1ULL << tk->tkr_mono.shift;
+ tk->ntp_error += remainder << tk->ntp_error_shift;
+ tk->ntp_error -= (1ULL << tk->tkr_mono.shift) << tk->ntp_error_shift;
+ }
}
#else
#define old_vsyscall_fixup(tk)
diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index 8f29abeb8c4d..cb9ab401e2d9 100644
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -1925,9 +1925,15 @@ static void __sched do_usleep_range(unsigned long min, unsigned long max)
}
/**
- * usleep_range - Drop in replacement for udelay where wakeup is flexible
+ * usleep_range - Sleep for an approximate time
* @min: Minimum time in usecs to sleep
* @max: Maximum time in usecs to sleep
+ *
+ * In non-atomic context where the exact wakeup time is flexible, use
+ * usleep_range() instead of udelay(). The sleep improves responsiveness
+ * by avoiding the CPU-hogging busy-wait of udelay(), and the range reduces
+ * power usage by allowing hrtimers to take advantage of an already-
+ * scheduled interrupt instead of scheduling a new one just for this sleep.
*/
void __sched usleep_range(unsigned long min, unsigned long max)
{
diff --git a/kernel/time/timer_stats.c b/kernel/time/timer_stats.c
index 1adecb4b87c8..087204c733eb 100644
--- a/kernel/time/timer_stats.c
+++ b/kernel/time/timer_stats.c
@@ -279,7 +279,7 @@ static void print_name_offset(struct seq_file *m, unsigned long addr)
static int tstats_show(struct seq_file *m, void *v)
{
- struct timespec period;
+ struct timespec64 period;
struct entry *entry;
unsigned long ms;
long events = 0;
@@ -295,11 +295,11 @@ static int tstats_show(struct seq_file *m, void *v)
time = ktime_sub(time_stop, time_start);
- period = ktime_to_timespec(time);
+ period = ktime_to_timespec64(time);
ms = period.tv_nsec / 1000000;
seq_puts(m, "Timer Stats Version: v0.3\n");
- seq_printf(m, "Sample period: %ld.%03ld s\n", period.tv_sec, ms);
+ seq_printf(m, "Sample period: %ld.%03ld s\n", (long)period.tv_sec, ms);
if (atomic_read(&overflow_count))
seq_printf(m, "Overflow: %d entries\n", atomic_read(&overflow_count));
seq_printf(m, "Collection: %s\n", timer_stats_active ? "active" : "inactive");
generated by cgit v1.2.3-55-g7522 (git 2.39.0) at 2024-11-12 20:41:10 +0100