From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758153AbZEELjs (ORCPT ); Tue, 5 May 2009 07:39:48 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751515AbZEELjj (ORCPT ); Tue, 5 May 2009 07:39:39 -0400 Received: from moutng.kundenserver.de ([212.227.126.177]:50258 "EHLO moutng.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751139AbZEELjj (ORCPT ); Tue, 5 May 2009 07:39:39 -0400 From: Arnd Bergmann To: "Rafael J. Wysocki" Subject: Re: compat ioctl32 for /dev/snapshot? Date: Tue, 5 May 2009 13:38:45 +0200 User-Agent: KMail/1.9.9 Cc: Andi Kleen , Michael Tokarev , "Linux-kernel" References: <49FEB572.4010909@msgid.tls.msk.ru> <20090504111243.GH23223@one.firstfloor.org> <200905042355.47109.rjw@sisk.pl> In-Reply-To: <200905042355.47109.rjw@sisk.pl> X-Face: I@=L^?./?$U,EK.)V[4*>`zSqm0>65YtkOe>TFD'!aw?7OVv#~5xd\s,[~w]-J!)|%=]>=?utf-8?q?+=0A=09=7EohchhkRGW=3F=7C6=5FqTmkd=5Ft=3FLZC=23Q-=60=2E=60Y=2Ea=5E?= =?utf-8?q?3zb?=) =?utf-8?q?+U-JVN=5DWT=25cw=23=5BYo0=267C=26bL12wWGlZi=0A=09=7EJ=3B=5Cwg?= =?utf-8?q?=3B3zRnz?=,J"CT_)=\H'1/{?SR7GDu?WIopm.HaBG=QYj"NZD_[zrM\Gip^U MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200905051338.46436.arnd@arndb.de> X-Provags-ID: V01U2FsdGVkX1+XXu0xB3nPcETN/yifrrEfks8v1vzA8PkAJr0 onpqJ6HXigrWLxidj4izXQjxa0t5mhFrZ3Om35E3RDVE9w2o/J 2iCrZ+ss2x4mK6nkbPymg== Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Monday 04 May 2009, Rafael J. Wysocki wrote: > In fact I don't think the 32-bit user space will work with 64-bit kernels as is > in this particular case, because of the different pointer size. > > Having a quick look at the code (I don't remember the details right now) > I think most probably it could be modified to handle this case too, but I'm not > really sure. I don't see anything in the snapshot code that passes pointers to the kernel, so why should the pointer size matter? Arnd <><