x86: offer frame pointers in all build modes

CONFIG_FRAME_POINTERS=y results in much better debug info for the
kernel (clear and precise backtraces), with the only drawback being
a ~1% increase in kernel size.

So offer it unconditionally and enable it by default.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

2 files changed, 9 insertions, 8 deletions

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 862adb9bf0d..73f7fe8fd4d 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -27,6 +27,7 @@ config X86
         select HAVE_IOREMAP_PROT
         select HAVE_KPROBES
         select ARCH_WANT_OPTIONAL_GPIOLIB
+        select ARCH_WANT_FRAME_POINTERS
         select HAVE_KRETPROBES
         select HAVE_FTRACE_MCOUNT_RECORD
         select HAVE_DYNAMIC_FTRACE
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 2e75478e9c6..2d0f1449017 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -566,14 +566,14 @@ config DEBUG_NOTIFIERS
 config FRAME_POINTER
         bool "Compile the kernel with frame pointers"
         depends on DEBUG_KERNEL && \
-                (X86 || CRIS || M68K || M68KNOMMU || FRV || UML || S390 || \
-                 AVR32 || SUPERH || BLACKFIN || MN10300)
-        default y if DEBUG_INFO && UML
-        help
-          If you say Y here the resulting kernel image will be slightly larger
-          and slower, but it might give very useful debugging information on
-          some architectures or if you use external debuggers.
-          If you don't debug the kernel, you can say N.
+                (CRIS || M68K || M68KNOMMU || FRV || UML || S390 || \
+                 AVR32 || SUPERH || BLACKFIN || MN10300) || \
+                ARCH_WANT_FRAME_POINTERS
+        default y if (DEBUG_INFO && UML) || ARCH_WANT_FRAME_POINTERS
+        help
+          If you say Y here the resulting kernel image will be slightly
+          larger and slower, but it gives very useful debugging information
+          in case of kernel bugs. (precise oopses/stacktraces/warnings)
 
 config BOOT_PRINTK_DELAY
         bool "Delay each boot printk message by N milliseconds"