From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752667AbcELJWx (ORCPT ); Thu, 12 May 2016 05:22:53 -0400 Received: from mout.kundenserver.de ([212.227.126.133]:49774 "EHLO mout.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752200AbcELJWu (ORCPT ); Thu, 12 May 2016 05:22:50 -0400 From: Arnd Bergmann To: Catalin Marinas Cc: linux-doc@vger.kernel.org, Andrew Pinski , heiko.carstens@de.ibm.com, Yury Norov , Hanjun Guo , joseph@codesourcery.com, linux-arch@vger.kernel.org, linux-s390@vger.kernel.org, "jijun (D)" , Prasun.Kapoor@caviumnetworks.com, schwab@suse.de, agraf@suse.de, pinskia@gmail.com, klimov.linux@gmail.com, broonie@kernel.org, "Zhangjian (Bamvor)" , linux-arm-kernel@lists.infradead.org, Nathan_Lynch@mentor.com, linux-kernel@vger.kernel.org, Andrew Pinski , schwidefsky@de.ibm.com, christoph.muellner@theobroma-systems.com Subject: Re: [PATCH 20/25] arm64:ilp32: add sys_ilp32.c and a separate table (in entry.S) to use it Date: Thu, 12 May 2016 11:21:42 +0200 Message-ID: <2733875.IzutTZKHMc@wuerfel> User-Agent: KMail/4.11.5 (Linux/3.16.0-10-generic; KDE/4.11.5; x86_64; ; ) In-Reply-To: <20160512091758.GB11226@e104818-lin.cambridge.arm.com> References: <1459894127-17698-1-git-send-email-ynorov@caviumnetworks.com> <4989778.Fs81NJurjH@wuerfel> <20160512091758.GB11226@e104818-lin.cambridge.arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" X-Provags-ID: V03:K0:Bymgsuiw18SnahZe7smtt0QgpMLSNqI5zGMNRNodzyluBLPJJDx ADezHBOtMZZx2nmlbwluzimpBsztq++DIxmqggddhbDoMo8X5LwuJ4RfO/I5XBRmgaZ01Xt Ezz+kN3wzFc4LmmzYWS/NJdbxBvfT+V6PTknx38D8fBG7+DKNSFpTx2cw2Zr6gVbXKQR7D7 B83TO0W/N06oyYih+zTag== X-UI-Out-Filterresults: notjunk:1;V01:K0:OAlNUM2XRGc=:ZPi3tEmPPljSHdr8sz41/7 S6Lhwtci5G3PdTkzqLIlXNsvK+fg86zd+9Vpy7BFDBd0Wa7BV2FKJeUaLA4GnANzQ9HOrddeA hIjiq/auAPt1VD/6LuyBaMXxiXw0ViIsTcFAwxJyffN56UrzMorQ+OpE62OGEuvc/au7Tptz7 GdJ95cV3s6fnYYga0XnKW+9cWRPadb8wbMSjGUl9a6dNNX8lrtY34zWAwvO7RxhHU7t4o1Wan fhXynLwvuZiXicZ3dxhyoJbzMOZakhlNefznnWytiyJPc7WCJMe3RQ2UhOgkLZcVfrniltCM9 /GEzvPVtIYRGwFTrYb9e72M1tR7dnY/+Ni9S64BeAgRS6Syl+WZoRQ9yqXkoWs3QTqSfD39oO WwG7Sjhz0ZcCtZGTX0wZ0sJQCURcEaRgPVQX3FZM57ImjYKclOqTFx6FFEDECwJU/Pe/90RRA hicwewW680aYu1oCEYBke402YZLGpkxOiDCIiZL/pOis22wx2Z8Mmd/DO4TQeteQ6ofbkX1Hl PGWpqv2IHP17Z2p1B3tlutO380hNd2O4fT7oZX7dYWPqLSmUv5xKRX6AFVj873eZrPF1bijp8 3NcfFagWRcNTrWxCb2FUEuwxo+Zl0U+MLt/s7jJfRa4Mm1ybE0GoVw+6Bmn1laXjJ1aYFTA98 zJ7FRFG7Stp2+5BRJXLEIFg+Oi0Rnf6twg2wb1Z1n98wUd2Z6ch/vOEG4s0cSF4+6VupjV4qm fqcKPnNtovGmnQPb Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thursday 12 May 2016 10:17:58 Catalin Marinas wrote: > On Wed, May 11, 2016 at 09:30:07PM +0200, Arnd Bergmann wrote: > > On Wednesday 11 May 2016 17:59:01 Catalin Marinas wrote: > > > > I don't think the shifts are a problem, the main downside would be > > the limit to 44 bits of file offsets (16TB files), but it's also > > unclear if that is a practical problem at all. If it is, we run > > into the same problem on all other 32-bit architectures too. > > I hope people are seriously thinking of moving to an LP64 ABI if they > have such large file offset needs. Good point. 44 bits of file size is certainly enough for mmap() on a 32-bit task: you would only be able to map a very small fraction of the file anyway, and if you want to map larger files, and should move to 64-bit tasks long before this becomes a limitation. Arnd