[PATCH] CONFIG_UNWIND_INFO

["Jan Beulich" <JBeulich@novell.com>]

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As a foundation for reliable stack unwinding, this adds a config option
(available to all architectures except IA64) to enable the generation
of frame unwind information.

From: Jan Beulich <jbeulich@novell.com>

(actual patch attached)


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As a foundation for reliable stack unwinding, this adds a config option
(available to all architectures except IA64) to enable the generation
of frame unwind information.

From: Jan Beulich <jbeulich@novell.com>

--- 2.6.14/Makefile	2005-10-28 02:02:08.000000000 +0200
+++ 2.6.14-unwind-info/Makefile	2005-11-04 16:20:57.000000000 +0100
@@ -517,6 +517,10 @@ CFLAGS		+= $(call add-align,CONFIG_CC_AL
 CFLAGS		+= $(call add-align,CONFIG_CC_ALIGN_LOOPS,-loops)
 CFLAGS		+= $(call add-align,CONFIG_CC_ALIGN_JUMPS,-jumps)
 
+ifdef CONFIG_UNWIND_INFO
+CFLAGS		+= -fasynchronous-unwind-tables
+endif
+
 ifdef CONFIG_FRAME_POINTER
 CFLAGS		+= -fno-omit-frame-pointer $(call cc-option,-fno-optimize-sibling-calls,)
 else
--- 2.6.14/lib/Kconfig.debug	2005-10-28 02:02:08.000000000 +0200
+++ 2.6.14-unwind-info/lib/Kconfig.debug	2005-11-08 10:36:39.000000000 +0100
@@ -178,3 +178,12 @@ config FRAME_POINTER
 	  on some architectures or you use external debuggers.
 	  If you don't debug the kernel, you can say N.
 
+config UNWIND_INFO
+	bool "Compile the kernel with frame unwind information"
+	depends on !IA64
+	default DEBUG_KERNEL
+	help
+	  If you say Y here the resulting kernel image will be slightly larger
+	  but not slower, and it will give very useful debugging information.
+	  If you don't debug the kernel, you can say N, but we may not be able
+	  to solve problems without frame unwind information or frame pointers.