Re: [PATCH] arm64: remove redundant FRAME_POINTER kconfig option

From: "Shi, Yang" <yang.shi@linaro.org>
To: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>,
	Mark Rutland <mark.rutland@arm.com>,
	linaro-kernel@lists.linaro.org, linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH] arm64: remove redundant FRAME_POINTER kconfig option
Date: Fri, 06 Nov 2015 09:39:07 -0800	[thread overview]
Message-ID: <563CE5BB.2080701@linaro.org> (raw)
In-Reply-To: <20151106173558.GC7637@e104818-lin.cambridge.arm.com>

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.

Or we could do:

select FRAME_POINTER is ARM64

Thanks,
Yang

>