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x86: offer frame pointers in all build modes

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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>
This commit is contained in:
Ingo Molnar 2009-01-07 11:05:10 +01:00
parent 0936912274
commit da4276b829
2 changed files with 8 additions and 7 deletions
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1
arch/x86/Kconfig
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@ -27,6 +27,7 @@ config X86
select HAVE_IOREMAP_PROT select HAVE_IOREMAP_PROT
select HAVE_KPROBES select HAVE_KPROBES
select ARCH_WANT_OPTIONAL_GPIOLIB select ARCH_WANT_OPTIONAL_GPIOLIB
select ARCH_WANT_FRAME_POINTERS
select HAVE_KRETPROBES select HAVE_KRETPROBES
select HAVE_FTRACE_MCOUNT_RECORD select HAVE_FTRACE_MCOUNT_RECORD
select HAVE_DYNAMIC_FTRACE select HAVE_DYNAMIC_FTRACE

14
lib/Kconfig.debug
View File

@ -566,14 +566,14 @@ config DEBUG_NOTIFIERS
config FRAME_POINTER config FRAME_POINTER
bool "Compile the kernel with frame pointers" bool "Compile the kernel with frame pointers"
depends on DEBUG_KERNEL && \ depends on DEBUG_KERNEL && \
(X86 || CRIS || M68K || M68KNOMMU || FRV || UML || S390 || \ (CRIS || M68K || M68KNOMMU || FRV || UML || S390 || \
AVR32 || SUPERH || BLACKFIN || MN10300) AVR32 || SUPERH || BLACKFIN || MN10300) || \
default y if DEBUG_INFO && UML ARCH_WANT_FRAME_POINTERS
default y if (DEBUG_INFO && UML) || ARCH_WANT_FRAME_POINTERS
help help
If you say Y here the resulting kernel image will be slightly larger If you say Y here the resulting kernel image will be slightly
and slower, but it might give very useful debugging information on larger and slower, but it gives very useful debugging information
some architectures or if you use external debuggers. in case of kernel bugs. (precise oopses/stacktraces/warnings)
If you don't debug the kernel, you can say N.
config BOOT_PRINTK_DELAY config BOOT_PRINTK_DELAY
bool "Delay each boot printk message by N milliseconds" bool "Delay each boot printk message by N milliseconds"