linux-kernel - Re: [PATCH] arm64: remove redundant FRAME

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Message-ID: <20151106161214.GY7637@e104818-lin.cambridge.arm.com>
Date:	Fri, 6 Nov 2015 16:12:14 +0000
From:	Catalin Marinas <catalin.marinas@....com>
To:	Will Deacon <will.deacon@....com>
Cc:	Yang Shi <yang.shi@...aro.org>, linaro-kernel@...ts.linaro.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] arm64: remove redundant FRAME_POINTER kconfig option

On Fri, Nov 06, 2015 at 12:30:09PM +0000, Will Deacon wrote:
> On Wed, Nov 04, 2015 at 09:37:51AM -0800, Yang Shi wrote:
> > FRAME_POINTER is defined in lib/Kconfig.debug, it is unnecessary to redefine
> > it in arch/arm64/Kconfig.debug.
> 
> It might be worth noting that this adds a dependency on DEBUG_KERNEL
> for building with frame pointers. I'm ok with that (it appears to be
> enabled in defconfig and follows the vast majority of other archs) but
> it is a change in behaviour.

We shouldn't have the dependency on DEBUG_KERNEL since we select
ARCH_WANT_FRAME_POINTERS on arm64. However, the patch would allow one to
disable FRAME_POINTERS (not sure it has any effect on the aarch64 gcc
though).

-- 
Catalin
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