tracing: have function trace select kallsyms

Impact: fix output of function tracer to be useful

The function tracer is pretty useless if KALLSYMS is not configured.
Unless you are good at reading hex values, the function tracer should
select the KALLSYMS configuration.

Also, the dynamic function tracer will fail its self test if KALLSYMS
is not selected.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>

diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 58a93fb..34e707e 100644 (file)
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -52,6 +52,7 @@ config FUNCTION_TRACER
        depends on HAVE_FUNCTION_TRACER
        depends on DEBUG_KERNEL
        select FRAME_POINTER
+       select KALLSYMS
        select TRACING
        select CONTEXT_SWITCH_TRACER
        help
@@ -238,6 +239,7 @@ config STACK_TRACER
        depends on DEBUG_KERNEL
        select FUNCTION_TRACER
        select STACKTRACE
+       select KALLSYMS
        help
          This special tracer records the maximum stack footprint of the
          kernel and displays it in debugfs/tracing/stack_trace.