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From: Vineet Gupta <Vineet.Gupta1@synopsys.com>
To: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
CC: Dave Hansen <dave.hansen@linux.intel.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        "Paul E. McKenney" <paul.mckenney@linaro.org>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Michel Lespinasse <walken@google.com>
Subject: Re: [PATCH] Kconfig.debug: Add FRAME_POINTER anti-dependency for ARC
Thread-Topic: [PATCH] Kconfig.debug: Add FRAME_POINTER anti-dependency for
 ARC
Thread-Index: AQHOov/erDeR0JeI70CghkAjOCB3Tg==
Date: Thu, 29 Aug 2013 11:04:28 +0000
Message-ID: <C2D7FE5348E1B147BCA15975FBA23075141061@IN01WEMBXA.internal.synopsys.com>
References: <1377592285-21148-1-git-send-email-vgupta@synopsys.com>
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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@synopsys.com>
> Cc: Dave Hansen <dave.hansen@linux.intel.com>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: "Paul E. McKenney" <paul.mckenney@linaro.org>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Michel Lespinasse <walken@google.com>
> Cc: linux-kernel@vger.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
>