The global switch of cpuidle can be turned back on in some case.
So add enable_cpuidle().

Signed-off-by: Huisong Li <lihuisong@huawei.com>
---
 drivers/cpuidle/cpuidle.c | 5 ++++-
 include/linux/cpuidle.h   | 2 ++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c
index 56132e843c99..980ddfd3d930 100644
--- a/drivers/cpuidle/cpuidle.c
+++ b/drivers/cpuidle/cpuidle.c
@@ -48,7 +48,10 @@ void disable_cpuidle(void)
 {
 	off = 1;
 }
-
+void enable_cpuidle(void)
+{
+	off = 0;
+}
 bool cpuidle_not_available(struct cpuidle_driver *drv,
 			   struct cpuidle_device *dev)
 {
diff --git a/include/linux/cpuidle.h b/include/linux/cpuidle.h
index a9ee4fe55dcf..94c030748af3 100644
--- a/include/linux/cpuidle.h
+++ b/include/linux/cpuidle.h
@@ -168,6 +168,7 @@ struct cpuidle_driver {
 };
 
 #ifdef CONFIG_CPU_IDLE
+extern void enable_cpuidle(void);
 extern void disable_cpuidle(void);
 extern bool cpuidle_not_available(struct cpuidle_driver *drv,
 				  struct cpuidle_device *dev);
@@ -203,6 +204,7 @@ extern struct cpuidle_driver *cpuidle_get_cpu_driver(struct cpuidle_device *dev)
 static inline struct cpuidle_device *cpuidle_get_device(void)
 {return __this_cpu_read(cpuidle_devices); }
 #else
+static inline void enable_cpuidle(void) { }
 static inline void disable_cpuidle(void) { }
 static inline bool cpuidle_not_available(struct cpuidle_driver *drv,
 					 struct cpuidle_device *dev)
-- 
2.33.0