x86: add a simple backtrace test module

During the work on the x86 32 and 64 bit backtrace code I found it useful
to have a simple test module to test a process and irq context backtrace.
Since the existing backtrace code was buggy, I figure it might be useful
to have such a test module in the kernel so that maybe we can even
detect such bugs earlier..

[ mingo@elte.hu: build fix ]

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 12 insertions, 0 deletions

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index f535b9b5eb00..aa56e631580d 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -506,6 +506,18 @@ config KPROBES_SANITY_TEST
 
           Say N if you are unsure.
 
+config BACKTRACE_SELF_TEST
+        tristate "Self test for the backtrace code"
+        depends on DEBUG_KERNEL
+        default n
+        help
+          This option provides a kernel module that can be used to test
+          the kernel stack backtrace code. This option is not useful
+          for distributions or general kernels, but only for kernel
+          developers working on architecture code.
+
+          Say N if you are unsure.
+
 config LKDTM
         tristate "Linux Kernel Dump Test Tool Module"
         depends on DEBUG_KERNEL