linux-kernel - Re: [PATCH 25/25] arm64:ilp32: add ARM64

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Message-ID: <20160429160334.GD30316@e104818-lin.cambridge.arm.com>
Date:	Fri, 29 Apr 2016 17:03:34 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Yury Norov <ynorov@...iumnetworks.com>
Cc:	arnd@...db.de, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-s390@...r.kernel.org, pinskia@...il.com,
	Prasun.Kapoor@...iumnetworks.com, schwab@...e.de,
	broonie@...nel.org, linux-doc@...r.kernel.org,
	heiko.carstens@...ibm.com, agraf@...e.de, klimov.linux@...il.com,
	Andrew Pinski <Andrew.Pinski@...iumnetworks.com>,
	bamvor.zhangjian@...wei.com, Andrew Pinski <apinski@...ium.com>,
	schwidefsky@...ibm.com, Nathan_Lynch@...tor.com,
	Philipp Tomsich <philipp.tomsich@...obroma-systems.com>,
	joseph@...esourcery.com, christoph.muellner@...obroma-systems.com
Subject: Re: [PATCH 25/25] arm64:ilp32: add ARM64_ILP32 to Kconfig

On Wed, Apr 06, 2016 at 01:08:47AM +0300, Yury Norov wrote:
> +config ARM64_ILP32
> +	bool "Kernel support for ILP32"
> +	select COMPAT_WRAPPER
> +	help
> +	  This option enables support for AArch64 ILP32 user space.  ILP32
> +	  is an ABI where long and pointers are 32bits but it uses the AARCH64
> +	  instruction set.

Is there any penalty for AArch32 tasks when selecting COMPAT_WRAPPER?

-- 
Catalin