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-rw-r--r--kernel/time/clockevents.c21
-rw-r--r--kernel/time/posix-stubs.c20
-rw-r--r--kernel/time/time.c12
-rw-r--r--kernel/time/timekeeping.c60
-rw-r--r--kernel/time/timer.c39
5 files changed, 105 insertions, 47 deletions
diff --git a/kernel/time/clockevents.c b/kernel/time/clockevents.c
index 4237e0744e26..16c027e9cc73 100644
--- a/kernel/time/clockevents.c
+++ b/kernel/time/clockevents.c
@@ -280,17 +280,22 @@ static int clockevents_program_min_delta(struct clock_event_device *dev)
static int clockevents_program_min_delta(struct clock_event_device *dev)
{
unsigned long long clc;
- int64_t delta;
+ int64_t delta = 0;
+ int i;
- delta = dev->min_delta_ns;
- dev->next_event = ktime_add_ns(ktime_get(), delta);
+ for (i = 0; i < 10; i++) {
+ delta += dev->min_delta_ns;
+ dev->next_event = ktime_add_ns(ktime_get(), delta);
- if (clockevent_state_shutdown(dev))
- return 0;
+ if (clockevent_state_shutdown(dev))
+ return 0;
- dev->retries++;
- clc = ((unsigned long long) delta * dev->mult) >> dev->shift;
- return dev->set_next_event((unsigned long) clc, dev);
+ dev->retries++;
+ clc = ((unsigned long long) delta * dev->mult) >> dev->shift;
+ if (dev->set_next_event((unsigned long) clc, dev) == 0)
+ return 0;
+ }
+ return -ETIME;
}
#endif /* CONFIG_GENERIC_CLOCKEVENTS_MIN_ADJUST */
diff --git a/kernel/time/posix-stubs.c b/kernel/time/posix-stubs.c
index 06f34feb635e..b258bee13b02 100644
--- a/kernel/time/posix-stubs.c
+++ b/kernel/time/posix-stubs.c
@@ -117,8 +117,7 @@ SYSCALL_DEFINE4(clock_nanosleep, const clockid_t, which_clock, int, flags,
const struct timespec __user *, rqtp,
struct timespec __user *, rmtp)
{
- struct timespec64 t64;
- struct timespec t;
+ struct timespec64 t;
switch (which_clock) {
case CLOCK_REALTIME:
@@ -129,16 +128,15 @@ SYSCALL_DEFINE4(clock_nanosleep, const clockid_t, which_clock, int, flags,
return -EINVAL;
}
- if (copy_from_user(&t, rqtp, sizeof (struct timespec)))
+ if (get_timespec64(&t, rqtp))
return -EFAULT;
- t64 = timespec_to_timespec64(t);
- if (!timespec64_valid(&t64))
+ if (!timespec64_valid(&t))
return -EINVAL;
if (flags & TIMER_ABSTIME)
rmtp = NULL;
current->restart_block.nanosleep.type = rmtp ? TT_NATIVE : TT_NONE;
current->restart_block.nanosleep.rmtp = rmtp;
- return hrtimer_nanosleep(&t64, flags & TIMER_ABSTIME ?
+ return hrtimer_nanosleep(&t, flags & TIMER_ABSTIME ?
HRTIMER_MODE_ABS : HRTIMER_MODE_REL,
which_clock);
}
@@ -203,8 +201,7 @@ COMPAT_SYSCALL_DEFINE4(clock_nanosleep, clockid_t, which_clock, int, flags,
struct compat_timespec __user *, rqtp,
struct compat_timespec __user *, rmtp)
{
- struct timespec64 t64;
- struct timespec t;
+ struct timespec64 t;
switch (which_clock) {
case CLOCK_REALTIME:
@@ -215,16 +212,15 @@ COMPAT_SYSCALL_DEFINE4(clock_nanosleep, clockid_t, which_clock, int, flags,
return -EINVAL;
}
- if (compat_get_timespec(&t, rqtp))
+ if (compat_get_timespec64(&t, rqtp))
return -EFAULT;
- t64 = timespec_to_timespec64(t);
- if (!timespec64_valid(&t64))
+ if (!timespec64_valid(&t))
return -EINVAL;
if (flags & TIMER_ABSTIME)
rmtp = NULL;
current->restart_block.nanosleep.type = rmtp ? TT_COMPAT : TT_NONE;
current->restart_block.nanosleep.compat_rmtp = rmtp;
- return hrtimer_nanosleep(&t64, flags & TIMER_ABSTIME ?
+ return hrtimer_nanosleep(&t, flags & TIMER_ABSTIME ?
HRTIMER_MODE_ABS : HRTIMER_MODE_REL,
which_clock);
}
diff --git a/kernel/time/time.c b/kernel/time/time.c
index fe60ebd301cf..bd4e6c7dd689 100644
--- a/kernel/time/time.c
+++ b/kernel/time/time.c
@@ -82,7 +82,7 @@ SYSCALL_DEFINE1(time, time_t __user *, tloc)
SYSCALL_DEFINE1(stime, time_t __user *, tptr)
{
- struct timespec tv;
+ struct timespec64 tv;
int err;
if (get_user(tv.tv_sec, tptr))
@@ -90,11 +90,11 @@ SYSCALL_DEFINE1(stime, time_t __user *, tptr)
tv.tv_nsec = 0;
- err = security_settime(&tv, NULL);
+ err = security_settime64(&tv, NULL);
if (err)
return err;
- do_settimeofday(&tv);
+ do_settimeofday64(&tv);
return 0;
}
@@ -122,7 +122,7 @@ COMPAT_SYSCALL_DEFINE1(time, compat_time_t __user *, tloc)
COMPAT_SYSCALL_DEFINE1(stime, compat_time_t __user *, tptr)
{
- struct timespec tv;
+ struct timespec64 tv;
int err;
if (get_user(tv.tv_sec, tptr))
@@ -130,11 +130,11 @@ COMPAT_SYSCALL_DEFINE1(stime, compat_time_t __user *, tptr)
tv.tv_nsec = 0;
- err = security_settime(&tv, NULL);
+ err = security_settime64(&tv, NULL);
if (err)
return err;
- do_settimeofday(&tv);
+ do_settimeofday64(&tv);
return 0;
}
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index c6a35fb3cf76..353f7bd1eeb0 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -60,8 +60,27 @@ struct tk_fast {
struct tk_read_base base[2];
};
-static struct tk_fast tk_fast_mono ____cacheline_aligned;
-static struct tk_fast tk_fast_raw ____cacheline_aligned;
+/* Suspend-time cycles value for halted fast timekeeper. */
+static u64 cycles_at_suspend;
+
+static u64 dummy_clock_read(struct clocksource *cs)
+{
+ return cycles_at_suspend;
+}
+
+static struct clocksource dummy_clock = {
+ .read = dummy_clock_read,
+};
+
+static struct tk_fast tk_fast_mono ____cacheline_aligned = {
+ .base[0] = { .clock = &dummy_clock, },
+ .base[1] = { .clock = &dummy_clock, },
+};
+
+static struct tk_fast tk_fast_raw ____cacheline_aligned = {
+ .base[0] = { .clock = &dummy_clock, },
+ .base[1] = { .clock = &dummy_clock, },
+};
/* flag for if timekeeping is suspended */
int __read_mostly timekeeping_suspended;
@@ -477,17 +496,38 @@ u64 notrace ktime_get_boot_fast_ns(void)
}
EXPORT_SYMBOL_GPL(ktime_get_boot_fast_ns);
-/* Suspend-time cycles value for halted fast timekeeper. */
-static u64 cycles_at_suspend;
-static u64 dummy_clock_read(struct clocksource *cs)
+/*
+ * See comment for __ktime_get_fast_ns() vs. timestamp ordering
+ */
+static __always_inline u64 __ktime_get_real_fast_ns(struct tk_fast *tkf)
{
- return cycles_at_suspend;
+ struct tk_read_base *tkr;
+ unsigned int seq;
+ u64 now;
+
+ do {
+ seq = raw_read_seqcount_latch(&tkf->seq);
+ tkr = tkf->base + (seq & 0x01);
+ now = ktime_to_ns(tkr->base_real);
+
+ now += timekeeping_delta_to_ns(tkr,
+ clocksource_delta(
+ tk_clock_read(tkr),
+ tkr->cycle_last,
+ tkr->mask));
+ } while (read_seqcount_retry(&tkf->seq, seq));
+
+ return now;
}
-static struct clocksource dummy_clock = {
- .read = dummy_clock_read,
-};
+/**
+ * ktime_get_real_fast_ns: - NMI safe and fast access to clock realtime.
+ */
+u64 ktime_get_real_fast_ns(void)
+{
+ return __ktime_get_real_fast_ns(&tk_fast_mono);
+}
/**
* halt_fast_timekeeper - Prevent fast timekeeper from accessing clocksource.
@@ -507,6 +547,7 @@ static void halt_fast_timekeeper(struct timekeeper *tk)
memcpy(&tkr_dummy, tkr, sizeof(tkr_dummy));
cycles_at_suspend = tk_clock_read(tkr);
tkr_dummy.clock = &dummy_clock;
+ tkr_dummy.base_real = tkr->base + tk->offs_real;
update_fast_timekeeper(&tkr_dummy, &tk_fast_mono);
tkr = &tk->tkr_raw;
@@ -654,6 +695,7 @@ static void timekeeping_update(struct timekeeper *tk, unsigned int action)
update_vsyscall(tk);
update_pvclock_gtod(tk, action & TK_CLOCK_WAS_SET);
+ tk->tkr_mono.base_real = tk->tkr_mono.base + tk->offs_real;
update_fast_timekeeper(&tk->tkr_mono, &tk_fast_mono);
update_fast_timekeeper(&tk->tkr_raw, &tk_fast_raw);
diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index f2674a056c26..fbb1f85327bf 100644
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -610,7 +610,7 @@ static bool timer_fixup_init(void *addr, enum debug_obj_state state)
}
/* Stub timer callback for improperly used timers. */
-static void stub_timer(unsigned long data)
+static void stub_timer(struct timer_list *unused)
{
WARN_ON(1);
}
@@ -626,7 +626,7 @@ static bool timer_fixup_activate(void *addr, enum debug_obj_state state)
switch (state) {
case ODEBUG_STATE_NOTAVAILABLE:
- setup_timer(timer, stub_timer, 0);
+ timer_setup(timer, stub_timer, 0);
return true;
case ODEBUG_STATE_ACTIVE:
@@ -665,7 +665,7 @@ static bool timer_fixup_assert_init(void *addr, enum debug_obj_state state)
switch (state) {
case ODEBUG_STATE_NOTAVAILABLE:
- setup_timer(timer, stub_timer, 0);
+ timer_setup(timer, stub_timer, 0);
return true;
default:
return false;
@@ -1560,8 +1560,11 @@ static int collect_expired_timers(struct timer_base *base,
* jiffies, otherwise forward to the next expiry time:
*/
if (time_after(next, jiffies)) {
- /* The call site will increment clock! */
- base->clk = jiffies - 1;
+ /*
+ * The call site will increment base->clk and then
+ * terminate the expiry loop immediately.
+ */
+ base->clk = jiffies;
return 0;
}
base->clk = next;
@@ -1668,9 +1671,20 @@ void run_local_timers(void)
raise_softirq(TIMER_SOFTIRQ);
}
-static void process_timeout(unsigned long __data)
+/*
+ * Since schedule_timeout()'s timer is defined on the stack, it must store
+ * the target task on the stack as well.
+ */
+struct process_timer {
+ struct timer_list timer;
+ struct task_struct *task;
+};
+
+static void process_timeout(struct timer_list *t)
{
- wake_up_process((struct task_struct *)__data);
+ struct process_timer *timeout = from_timer(timeout, t, timer);
+
+ wake_up_process(timeout->task);
}
/**
@@ -1704,7 +1718,7 @@ static void process_timeout(unsigned long __data)
*/
signed long __sched schedule_timeout(signed long timeout)
{
- struct timer_list timer;
+ struct process_timer timer;
unsigned long expire;
switch (timeout)
@@ -1738,13 +1752,14 @@ signed long __sched schedule_timeout(signed long timeout)
expire = timeout + jiffies;
- setup_timer_on_stack(&timer, process_timeout, (unsigned long)current);
- __mod_timer(&timer, expire, false);
+ timer.task = current;
+ timer_setup_on_stack(&timer.timer, process_timeout, 0);
+ __mod_timer(&timer.timer, expire, false);
schedule();
- del_singleshot_timer_sync(&timer);
+ del_singleshot_timer_sync(&timer.timer);
/* Remove the timer from the object tracker */
- destroy_timer_on_stack(&timer);
+ destroy_timer_on_stack(&timer.timer);
timeout = expire - jiffies;
generated by cgit (git 2.34.1) at 2024-05-21 06:06:11 +0000