Can not get 'function_graph' for

[Ryan Wang]

Hi,

        I have build 2.6.33.1 with ftrace on, but after reboot
I cannot get function_graph from available_tracers.
===============
# .config
CONFIG_NOP_TRACER=y
CONFIG_HAVE_FUNCTION_TRACER=y
CONFIG_HAVE_FUNCTION_GRAPH_TRACER=y
CONFIG_TRACER_MAX_TRACE=y
CONFIG_CONTEXT_SWITCH_TRACER=y
CONFIG_GENERIC_TRACER=y
CONFIG_FUNCTION_TRACER=y
CONFIG_IRQSOFF_TRACER=y
CONFIG_SYSPROF_TRACER=y
CONFIG_SCHED_TRACER=y
CONFIG_BOOT_TRACER=y
CONFIG_BRANCH_TRACER=y
# CONFIG_POWER_TRACER is not set
CONFIG_KSYM_TRACER=y
# CONFIG_PROFILE_KSYM_TRACER is not set
CONFIG_STACK_TRACER=y
CONFIG_WORKQUEUE_TRACER=y


======================================
# cat available_tracers
ksym_tracer blk kmemtrace branch mmiotrace wakeup_rt wakeup irqsoff
function sched_switch initcall nop
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