linux-kernel - Re: [PATCH] Kconfig.debug: Add FRAME

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Date:	Thu, 29 Aug 2013 11:04:28 +0000
From:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:	Dave Hansen <dave.hansen@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Paul E. McKenney" <paul.mckenney@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Michel Lespinasse <walken@...gle.com>
Subject: Re: [PATCH] Kconfig.debug: Add FRAME_POINTER anti-dependency for ARC

Ping ?

-Vineet

On 08/27/2013 02:01 PM, Vineet Gupta wrote:
> Frame pointer on ARC doesn't serve the conventional purpose of stack
> unwinding due to the typical way ABI designates it's usage.
> Thus it's explicit usage on ARC is discouraged (gcc is free to use it,
> for some tricky stack frames even if -fomit-frame-pointer).
> 
> Hence no point enabling it for ARC.
> 
> Signed-off-by: Vineet Gupta <vgupta@...opsys.com>
> Cc: Dave Hansen <dave.hansen@...ux.intel.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: "Paul E. McKenney" <paul.mckenney@...aro.org>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Michel Lespinasse <walken@...gle.com>
> Cc: linux-kernel@...r.kernel.org
> ---
>  lib/Kconfig.debug | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
> index 1501aa5..c971f3a 100644
> --- a/lib/Kconfig.debug
> +++ b/lib/Kconfig.debug
> @@ -908,7 +908,7 @@ config LOCKDEP
>  	bool
>  	depends on DEBUG_KERNEL && TRACE_IRQFLAGS_SUPPORT && STACKTRACE_SUPPORT && LOCKDEP_SUPPORT
>  	select STACKTRACE
> -	select FRAME_POINTER if !MIPS && !PPC && !ARM_UNWIND && !S390 && !MICROBLAZE
> +	select FRAME_POINTER if !MIPS && !PPC && !ARM_UNWIND && !S390 && !MICROBLAZE && !ARC
>  	select KALLSYMS
>  	select KALLSYMS_ALL
>  
> @@ -1347,7 +1347,7 @@ config FAULT_INJECTION_STACKTRACE_FILTER
>  	depends on FAULT_INJECTION_DEBUG_FS && STACKTRACE_SUPPORT
>  	depends on !X86_64
>  	select STACKTRACE
> -	select FRAME_POINTER if !MIPS && !PPC && !S390 && !MICROBLAZE && !ARM_UNWIND
> +	select FRAME_POINTER if !MIPS && !PPC && !S390 && !MICROBLAZE && !ARM_UNWIND && !ARC
>  	help
>  	  Provide stacktrace filter for fault-injection capabilities
>  
> @@ -1357,7 +1357,7 @@ config LATENCYTOP
>  	depends on DEBUG_KERNEL
>  	depends on STACKTRACE_SUPPORT
>  	depends on PROC_FS
> -	select FRAME_POINTER if !MIPS && !PPC && !S390 && !MICROBLAZE && !ARM_UNWIND
> +	select FRAME_POINTER if !MIPS && !PPC && !S390 && !MICROBLAZE && !ARM_UNWIND && !ARC
>  	select KALLSYMS
>  	select KALLSYMS_ALL
>  	select STACKTRACE
> 

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