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-rw-r--r--kernel/sched/idle.c6
-rw-r--r--kernel/sched/sched.h30
2 files changed, 36 insertions, 0 deletions
diff --git a/kernel/sched/idle.c b/kernel/sched/idle.c
index 11e7bc434f43..c47fce75e666 100644
--- a/kernel/sched/idle.c
+++ b/kernel/sched/idle.c
@@ -147,6 +147,9 @@ use_default:
clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_ENTER, &dev->cpu))
goto use_default;
+ /* Take note of the planned idle state. */
+ idle_set_state(this_rq(), &drv->states[next_state]);
+
/*
* Enter the idle state previously returned by the governor decision.
* This function will block until an interrupt occurs and will take
@@ -154,6 +157,9 @@ use_default:
*/
entered_state = cpuidle_enter(drv, dev, next_state);
+ /* The cpu is no longer idle or about to enter idle. */
+ idle_set_state(this_rq(), NULL);
+
if (broadcast)
clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_EXIT, &dev->cpu);
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 76f3a38a401c..16e1ca9cb7e8 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -14,6 +14,7 @@
#include "cpuacct.h"
struct rq;
+struct cpuidle_state;
/* task_struct::on_rq states: */
#define TASK_ON_RQ_QUEUED 1
@@ -643,6 +644,11 @@ struct rq {
#ifdef CONFIG_SMP
struct llist_head wake_list;
#endif
+
+#ifdef CONFIG_CPU_IDLE
+ /* Must be inspected within a rcu lock section */
+ struct cpuidle_state *idle_state;
+#endif
};
static inline int cpu_of(struct rq *rq)
@@ -1196,6 +1202,30 @@ static inline void idle_exit_fair(struct rq *rq) { }
#endif
+#ifdef CONFIG_CPU_IDLE
+static inline void idle_set_state(struct rq *rq,
+ struct cpuidle_state *idle_state)
+{
+ rq->idle_state = idle_state;
+}
+
+static inline struct cpuidle_state *idle_get_state(struct rq *rq)
+{
+ WARN_ON(!rcu_read_lock_held());
+ return rq->idle_state;
+}
+#else
+static inline void idle_set_state(struct rq *rq,
+ struct cpuidle_state *idle_state)
+{
+}
+
+static inline struct cpuidle_state *idle_get_state(struct rq *rq)
+{
+ return NULL;
+}
+#endif
+
extern void sysrq_sched_debug_show(void);
extern void sched_init_granularity(void);
extern void update_max_interval(void);