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-rw-r--r--kernel/hrtimer.c15
1 files changed, 10 insertions, 5 deletions
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index de93a81..ec4cb9f 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -540,19 +540,19 @@ static inline int hrtimer_enqueue_reprogram(struct hrtimer *timer,
/*
* Switch to high resolution mode
*/
-static void hrtimer_switch_to_hres(void)
+static int hrtimer_switch_to_hres(void)
{
struct hrtimer_cpu_base *base = &__get_cpu_var(hrtimer_bases);
unsigned long flags;
if (base->hres_active)
- return;
+ return 1;
local_irq_save(flags);
if (tick_init_highres()) {
local_irq_restore(flags);
- return;
+ return 0;
}
base->hres_active = 1;
base->clock_base[CLOCK_REALTIME].resolution = KTIME_HIGH_RES;
@@ -565,13 +565,14 @@ static void hrtimer_switch_to_hres(void)
local_irq_restore(flags);
printk(KERN_INFO "Switched to high resolution mode on CPU %d\n",
smp_processor_id());
+ return 1;
}
#else
static inline int hrtimer_hres_active(void) { return 0; }
static inline int hrtimer_is_hres_enabled(void) { return 0; }
-static inline void hrtimer_switch_to_hres(void) { }
+static inline int hrtimer_switch_to_hres(void) { return 0; }
static inline void hrtimer_force_reprogram(struct hrtimer_cpu_base *base) { }
static inline int hrtimer_enqueue_reprogram(struct hrtimer *timer,
struct hrtimer_clock_base *base)
@@ -1130,6 +1131,9 @@ static inline void run_hrtimer_queue(struct hrtimer_cpu_base *cpu_base,
if (base->softirq_time.tv64 <= timer->expires.tv64)
break;
+#ifdef CONFIG_HIGH_RES_TIMERS
+ WARN_ON_ONCE(timer->cb_mode == HRTIMER_CB_IRQSAFE_NO_SOFTIRQ);
+#endif
timer_stats_account_hrtimer(timer);
fn = timer->function;
@@ -1173,7 +1177,8 @@ void hrtimer_run_queues(void)
* deadlock vs. xtime_lock.
*/
if (tick_check_oneshot_change(!hrtimer_is_hres_enabled()))
- hrtimer_switch_to_hres();
+ if (hrtimer_switch_to_hres())
+ return;
hrtimer_get_softirq_time(cpu_base);
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