lib: turn CONFIG_STACKTRACE into an actual option.

From: Dave Jones
Date: Wed Aug 13 2014 - 11:04:15 EST

I was puzzled why /proc/$$/stack had disappeared, until I figured out
I had disabled the last debug option that did a 'select STACKTRACE'.
This patch makes the option show up at config time, so it can be
enabled without enabling any of the more heavyweight debug options.

Signed-off-by: Dave Jones <davej@xxxxxxxxxx>

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 7a638aa3545b..96c64beac12a 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1008,8 +1008,13 @@ config TRACE_IRQFLAGS
either tracing or lock debugging.

- bool
+ bool "Stack backtrace support"
+ help
+ This option causes the kernel to create a /proc/pid/stack for
+ every process, showing its current stack trace.
+ It is also used by various kernel debugging features that require
+ stack trace generation.

bool "kobject debugging"

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