[RFC,1/7] sched: idle: Add sched get idle state helper

Commit Message

Abel Vesa March 27, 2019, 1:21 p.m. UTC

This helper is useful in order to get the idle state of a specific cpu.

Signed-off-by: Abel Vesa <[e-mail]>
---
 include/linux/cpuidle.h |  1 +
 kernel/sched/idle.c     | 11 +++++++++++
 2 files changed, 12 insertions(+)

Patch

diff --git a/include/linux/cpuidle.h b/include/linux/cpuidle.h
index 3b39472..88a9119 100644
--- a/include/linux/cpuidle.h
+++ b/include/linux/cpuidle.h
@@ -211,6 +211,7 @@  static inline void cpuidle_use_deepest_state(bool enable)
 
 /* kernel/sched/idle.c */
 extern void sched_idle_set_state(struct cpuidle_state *idle_state);
+extern struct cpuidle_state *sched_idle_get_state(int cpu);
 extern void default_idle_call(void);
 
 #ifdef CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED
diff --git a/kernel/sched/idle.c b/kernel/sched/idle.c
index f5516ba..484825d 100644
--- a/kernel/sched/idle.c
+++ b/kernel/sched/idle.c
@@ -21,6 +21,17 @@  void sched_idle_set_state(struct cpuidle_state *idle_state)
 	idle_set_state(this_rq(), idle_state);
 }
 
+/**
+ * sched_idle_get_state - Get idle state for the specified CPU.
+ * @index: CPU index.
+ */
+
+struct cpuidle_state *sched_idle_get_state(int cpu)
+{
+	return idle_get_state(cpu_rq(cpu));
+}
+
+
 static int __read_mostly cpu_idle_force_poll;
 
 void cpu_idle_poll_ctrl(bool enable)