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

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Message-ID: <20160429161445.GE30316@e104818-lin.cambridge.arm.com>
Date:	Fri, 29 Apr 2016 17:14:46 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Yury Norov <ynorov@...iumnetworks.com>
Cc:	linux-arch@...r.kernel.org, linux-s390@...r.kernel.org,
	arnd@...db.de, pinskia@...il.com, Prasun.Kapoor@...iumnetworks.com,
	schwab@...e.de, joseph@...esourcery.com, linux-doc@...r.kernel.org,
	heiko.carstens@...ibm.com, linux-kernel@...r.kernel.org,
	agraf@...e.de, klimov.linux@...il.com,
	Andrew Pinski <Andrew.Pinski@...iumnetworks.com>,
	broonie@...nel.org, bamvor.zhangjian@...wei.com,
	Andrew Pinski <apinski@...ium.com>, schwidefsky@...ibm.com,
	Nathan_Lynch@...tor.com,
	Philipp Tomsich <philipp.tomsich@...obroma-systems.com>,
	linux-arm-kernel@...ts.infradead.org,
	christoph.muellner@...obroma-systems.com
Subject: Re: [PATCH 25/25] arm64:ilp32: add ARM64_ILP32 to Kconfig

On Fri, Apr 29, 2016 at 07:08:55PM +0300, Yury Norov wrote:
> On Fri, Apr 29, 2016 at 05:03:34PM +0100, Catalin Marinas wrote:
> > 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?
> 
> No. AARCH32 doesn't define __SC_WRAP and so __SYSCALL macro is used,
> which fills syscall table with sys_xxx versions, not compat_sys_xxx.

Ah, I forgot it has its own unistd32.h.

Thanks.

-- 
Catalin