lib: turn CONFIG_STACKTRACE into an actual option.

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@redhat.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 1b233fc..a285900 100644 (file)
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1036,8 +1036,13 @@ config TRACE_IRQFLAGS
          either tracing or lock debugging.
 
 config STACKTRACE
-       bool
+       bool "Stack backtrace support"
        depends on STACKTRACE_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.
 
 config DEBUG_KOBJECT
        bool "kobject debugging"