diff mbox

arm64: remove redundant FRAME_POINTER kconfig option

Message ID 20151106175119.GD7637@e104818-lin.cambridge.arm.com
State New
Headers show

Commit Message

Catalin Marinas Nov. 6, 2015, 5:51 p.m. UTC 
On Fri, Nov 06, 2015 at 09:39:07AM -0800, Shi, Yang wrote:
> On 11/6/2015 9:35 AM, Catalin Marinas wrote:

> >On Fri, Nov 06, 2015 at 09:23:38AM -0800, Shi, Yang wrote:

> >>On 11/6/2015 8:25 AM, Will Deacon wrote:

> >>>However, the patch would allow one to

> >>>disable FRAME_POINTERS (not sure it has any effect on the aarch64 gcc

> >>>though).

> >>

> >>No, it doesn't. Actually, FRAME_POINTER could be disabled regardless of the

> >>patch.

> >

> >In which case I suggest that we always select it just as a clearer

> >statement that the feature cannot be disabled (and you never know what

> >the compiler people decide to do in the future).

> 

> Do you mean select FRAME_POINTER in ARCH_WANT_FRAME_POINTERS?

> 

> Yes, we could, but this may cause other architectures which select

> ARCH_WANT_FRAME_POINTERS to have FRAME_POINTER selected too.


This would have been the ideal option, something like:


-- 
Catalin
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diff mbox

Patch

--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -322,7 +322,7 @@  config ARCH_WANT_FRAME_POINTERS
 	help
 
 config FRAME_POINTER
-	bool "Compile the kernel with frame pointers"
+	bool "Compile the kernel with frame pointers" if !ARCH_WANT_FRAME_POINTERS
 	depends on DEBUG_KERNEL && \
 		(CRIS || M68K || FRV || UML || \
 		 AVR32 || SUPERH || BLACKFIN || MN10300 || METAG) || \

But, as you said, we would need to check the other architectures
selecting ARCH_WANT_FRAME_POINTERS.

In the meantime:

--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -27,6 +27,7 @@  config ARM64
 	select CPU_PM if (SUSPEND || CPU_IDLE)
 	select DCACHE_WORD_ACCESS
 	select EDAC_SUPPORT
+	select FRAME_POINTER
 	select GENERIC_ALLOCATOR
 	select GENERIC_CLOCKEVENTS
 	select GENERIC_CLOCKEVENTS_BROADCAST