From: Dave Jones <davej@redhat.com>
Date: Fri, 29 Aug 2014 22:18:35 +0000 (-0700)
Subject: lib: turn CONFIG_STACKTRACE into an actual option.
X-Git-Tag: v3.17-rc3~9^2~17
X-Git-Url: http://git.cascardo.info/?p=cascardo%2Flinux.git;a=commitdiff_plain;h=0c38e1fe0fced6aa06dbf444f7203dd7f325e369

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 1b233fc67466..a28590083622 100644
--- 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"