Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754044AbcD2QDp (ORCPT ); Fri, 29 Apr 2016 12:03:45 -0400 Received: from foss.arm.com ([217.140.101.70]:52110 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753631AbcD2QDl (ORCPT ); Fri, 29 Apr 2016 12:03:41 -0400 Date: Fri, 29 Apr 2016 17:03:34 +0100 From: Catalin Marinas To: Yury Norov Cc: arnd@arndb.de, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, linux-s390@vger.kernel.org, pinskia@gmail.com, Prasun.Kapoor@caviumnetworks.com, schwab@suse.de, broonie@kernel.org, linux-doc@vger.kernel.org, heiko.carstens@de.ibm.com, agraf@suse.de, klimov.linux@gmail.com, Andrew Pinski , bamvor.zhangjian@huawei.com, Andrew Pinski , schwidefsky@de.ibm.com, Nathan_Lynch@mentor.com, Philipp Tomsich , joseph@codesourcery.com, christoph.muellner@theobroma-systems.com Subject: Re: [PATCH 25/25] arm64:ilp32: add ARM64_ILP32 to Kconfig Message-ID: <20160429160334.GD30316@e104818-lin.cambridge.arm.com> References: <1459894127-17698-1-git-send-email-ynorov@caviumnetworks.com> <1459894127-17698-26-git-send-email-ynorov@caviumnetworks.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1459894127-17698-26-git-send-email-ynorov@caviumnetworks.com> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 406 Lines: 13 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