ANDROID: sched: Add KConfig option to set ENERGY_AWARE sched feature on

This option defaults the ENERGY_AWARE scheduling feature to true,
as without SCHED_DEBUG set this feature can't be enabled or disabled
via sysctl.

Change-Id: Ibf8e5d9d8aedf5cc8f0ef322279209ca65a9786b
Signed-off-by: Chris Redpath <chris.redpath@arm.com>

init/Kconfig

@@ -959,6 +959,16 @@ config SCHED_AUTOGROUP
 	  desktop applications.  Task group autogeneration is currently based
 	  upon task session.
 
+config DEFAULT_USE_ENERGY_AWARE
+	bool "Default to enabling the Energy Aware Scheduler feature"
+	default n
+	help
+	  This option defaults the ENERGY_AWARE scheduling feature to true,
+	  as without SCHED_DEBUG set this feature can't be enabled or disabled
+	  via sysctl.
+
+	  Say N if unsure.
+
 config SYSFS_DEPRECATED
 	bool "Enable deprecated sysfs features to support old userspace tools"
 	depends on SYSFS

kernel/sched/features.h

@@ -90,4 +90,8 @@ SCHED_FEAT(WA_BIAS, true)
  * Energy aware scheduling. Use platform energy model to guide scheduling
  * decisions optimizing for energy efficiency.
  */
+#ifdef CONFIG_DEFAULT_USE_ENERGY_AWARE
+SCHED_FEAT(ENERGY_AWARE, true)
+#else
 SCHED_FEAT(ENERGY_AWARE, false)
+#endif