--- arch/arm/configs/express_defconfig

+++ arch/arm/configs/express_defconfig

@@ -522,7 +522,6 @@ CONFIG_MAGIC_SYSRQ=y

CONFIG_DEBUG_KERNEL=y

CONFIG_LOCKUP_DETECTOR=y

CONFIG_DEBUG_FS=y

-# CONFIG_FTRACE is not set

# CONFIG_BINARY_PRINTF is not set

# CONFIG_SCHED_DEBUG is not set

CONFIG_TIMER_STATS=y

@@ -533,6 +532,7 @@ CONFIG_DEBUG_SPINLOCK_SLEEP=y

CONFIG_DEBUG_INFO=y

# CONFIG_DEBUG_MEMORY_INIT is not set

CONFIG_DEBUG_LIST=y

+CONFIG_SCHED_TRACER=y

# CONFIG_DEBUG_PAGEALLOC is not set

CONFIG_ENABLE_DEFAULT_TRACERS=y

# CONFIG_DYNAMIC_DEBUG is not set