From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750832AbWCWQuB (ORCPT ); Thu, 23 Mar 2006 11:50:01 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751350AbWCWQuB (ORCPT ); Thu, 23 Mar 2006 11:50:01 -0500 Received: from pentafluge.infradead.org ([213.146.154.40]:4263 "EHLO pentafluge.infradead.org") by vger.kernel.org with ESMTP id S1750832AbWCWQuA (ORCPT ); Thu, 23 Mar 2006 11:50:00 -0500 Subject: Re: [RFCLUE2] 64 bit driver 32 bit app ioctl From: Arjan van de Ven To: William D Waddington Cc: linux-kernel@vger.kernel.org In-Reply-To: <4422B95D.9070900@beezmo.com> References: <4422B95D.9070900@beezmo.com> Content-Type: text/plain Date: Thu, 23 Mar 2006 17:49:57 +0100 Message-Id: <1143132597.3147.31.camel@laptopd505.fenrus.org> Mime-Version: 1.0 X-Mailer: Evolution 2.2.3 (2.2.3-2.fc4) Content-Transfer-Encoding: 7bit X-SRS-Rewrite: SMTP reverse-path rewritten from by pentafluge.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 2006-03-23 at 07:06 -0800, William D Waddington wrote: > Apologies for dashing this off without the proper homework. My > customer is out of country doing an installation, and didn't test > this configuration first :( > > Customer is running RHEL3 on a 64 bit PC. Running the 64 bit kernel > and my 64 bit driver. They are calling the driver from their 32 bit > app. The driver supports a whole mess of ioctls. > > It seems that the kernel is trapping the 32-bit ioctl call and returning > an error to the app w/out calling the driver. It looks like > register_ioctl32_conversion() can convice the kernel that the driver can > handle 32-bit calls, but it has to be called for each ioctl cmd (??) you forgot to attach you code btw or post the url to it..