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-rw-r--r--kernel/timer.c26
1 files changed, 22 insertions, 4 deletions
diff --git a/kernel/timer.c b/kernel/timer.c
index fe3a9a9f832..2410c18dbeb 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -489,9 +489,21 @@ unsigned long next_timer_interrupt(void)
struct list_head *list;
struct timer_list *nte;
unsigned long expires;
+ unsigned long hr_expires = MAX_JIFFY_OFFSET;
+ ktime_t hr_delta;
tvec_t *varray[4];
int i, j;
+ hr_delta = hrtimer_get_next_event();
+ if (hr_delta.tv64 != KTIME_MAX) {
+ struct timespec tsdelta;
+ tsdelta = ktime_to_timespec(hr_delta);
+ hr_expires = timespec_to_jiffies(&tsdelta);
+ if (hr_expires < 3)
+ return hr_expires + jiffies;
+ }
+ hr_expires += jiffies;
+
base = &__get_cpu_var(tvec_bases);
spin_lock(&base->t_base.lock);
expires = base->timer_jiffies + (LONG_MAX >> 1);
@@ -542,6 +554,10 @@ found:
}
}
spin_unlock(&base->t_base.lock);
+
+ if (time_before(hr_expires, expires))
+ return hr_expires;
+
return expires;
}
#endif
@@ -925,6 +941,8 @@ static inline void update_times(void)
void do_timer(struct pt_regs *regs)
{
jiffies_64++;
+ /* prevent loading jiffies before storing new jiffies_64 value. */
+ barrier();
update_times();
softlockup_tick(regs);
}
@@ -1336,8 +1354,8 @@ void __init init_timers(void)
#ifdef CONFIG_TIME_INTERPOLATION
-struct time_interpolator *time_interpolator;
-static struct time_interpolator *time_interpolator_list;
+struct time_interpolator *time_interpolator __read_mostly;
+static struct time_interpolator *time_interpolator_list __read_mostly;
static DEFINE_SPINLOCK(time_interpolator_lock);
static inline u64 time_interpolator_get_cycles(unsigned int src)
@@ -1351,10 +1369,10 @@ static inline u64 time_interpolator_get_cycles(unsigned int src)
return x();
case TIME_SOURCE_MMIO64 :
- return readq((void __iomem *) time_interpolator->addr);
+ return readq_relaxed((void __iomem *)time_interpolator->addr);
case TIME_SOURCE_MMIO32 :
- return readl((void __iomem *) time_interpolator->addr);
+ return readl_relaxed((void __iomem *)time_interpolator->addr);
default: return get_cycles();
}