We need to efficiently check whether a timer base has no pending events.
So introduce a new variable in struct timer_base to do so.
Signed-off-by: Nicolas Saenz Julienne <nsaenzju@xxxxxxxxxx>
---
kernel/time/timer.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index 4f7602724f9a..2d7d68296a3b 100644
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -201,6 +201,7 @@ struct timer_base {
#ifdef CONFIG_PREEMPT_RT
spinlock_t expiry_lock;
atomic_t timer_waiters;
+ bool pending;
#endif
unsigned long clk;
unsigned long next_expiry;
@@ -596,6 +597,9 @@ static void enqueue_timer(struct timer_base *base, struct timer_list *timer,
*/
base->next_expiry = bucket_expiry;
base->next_expiry_recalc = false;
+#ifdef CONFIG_PREEMPT_RT
+ base->pending = true;
+#endif
trigger_dyntick_cpu(base, timer);
}
}
@@ -1598,6 +1602,9 @@ static unsigned long __next_timer_interrupt(struct timer_base *base)
}
base->next_expiry_recalc = false;
+#ifdef CONFIG_PREEMPT_RT
+ base->pending = (next != base->clk + NEXT_TIMER_MAX_DELTA);
+#endif
return next;
}
@@ -1966,6 +1973,9 @@ int timers_prepare_cpu(unsigned int cpu)
base->clk = jiffies;
base->next_expiry = base->clk + NEXT_TIMER_MAX_DELTA;
base->is_idle = false;
+#ifdef CONFIG_PREEMPT_RT
+ base->pending = false;
+#endif
}
return 0;
}
--
2.31.1
