[PATCH 1/5] unwind, kconfig: Adding UNWIND* options

[Jiri Olsa]

Adding following config options:

CONFIG_UNWIND
- governs wether the unwind code is compiled in

CONFIG_UNWIND_EH_FRAME
- source of unwind data - eh_frame_hdr/eh_frame

CONFIG_UNWIND_DEBUG_FRAME
- source of unwind data - .debug.frame
---
 arch/x86/Kconfig.debug |    2 ++
 kernel/Kconfig.unwind  |   26 ++++++++++++++++++++++++++
 2 files changed, 28 insertions(+), 0 deletions(-)
 create mode 100644 kernel/Kconfig.unwind

diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug
index e46c214..4705ba1 100644
--- a/arch/x86/Kconfig.debug
+++ b/arch/x86/Kconfig.debug
@@ -299,4 +299,6 @@ config DEBUG_NMI_SELFTEST
 
 	  If unsure, say N.
 
+source "kernel/Kconfig.unwind"
+
 endmenu
diff --git a/kernel/Kconfig.unwind b/kernel/Kconfig.unwind
new file mode 100644
index 0000000..273dc68
--- /dev/null
+++ b/kernel/Kconfig.unwind
@@ -0,0 +1,26 @@
+
+config UNWIND
+	bool "Use compiler information to display backtrace dump"
+	---help---
+	  Adding code allowing to use compiled debug information
+	  for stack unwinding (results in MUCH bigger kernel
+	  and many more panics).
+
+choice
+	prompt "Unwind information source"
+	default UNWIND_EH_FRAME
+	depends on UNWIND
+	---help---
+	  source of unwind information
+
+config UNWIND_EH_FRAME
+	bool "exception frame section"
+	---help---
+	  eh_frame section
+
+config UNWIND_DEBUG_FRAME
+	bool "NOT IMPLEMENTED debug frame section"
+	---help---
+	  debug_frame section
+
+endchoice
-- 
1.7.1

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