From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dmitry Torokhov Subject: Re: INPUT_COMPAT_TEST Date: Wed, 7 Sep 2011 11:16:41 -0700 Message-ID: <20110907181641.GA5678@core.coreip.homeip.net> References: <4E17504F.5070806@zytor.com> <20110708204630.GA28623@core.coreip.homeip.net> <4E178320.7050401@zytor.com> <20110708223709.GB28623@core.coreip.homeip.net> <4E179033.9050806@zytor.com> <20110709003508.GC28623@core.coreip.homeip.net> <4E180BA5.4080808@zytor.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from mail-pz0-f42.google.com ([209.85.210.42]:40196 "EHLO mail-pz0-f42.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750896Ab1IGSQu (ORCPT ); Wed, 7 Sep 2011 14:16:50 -0400 Received: by pzk37 with SMTP id 37so89793pzk.1 for ; Wed, 07 Sep 2011 11:16:49 -0700 (PDT) Content-Disposition: inline In-Reply-To: <4E180BA5.4080808@zytor.com> Sender: linux-input-owner@vger.kernel.org List-Id: linux-input@vger.kernel.org To: "H. Peter Anvin" Cc: Philip Langdale , linux-input@vger.kernel.org, "H.J. Lu" On Sat, Jul 09, 2011 at 01:04:53AM -0700, H. Peter Anvin wrote: > On 07/08/2011 05:35 PM, Dmitry Torokhov wrote: > > > > Input only need to do this compat stuff on read/write paths so maybe if > > you add plumbing similar to compat_ioctl we could switch owver to it. > > > > The problem is that read/write ties into a large number of system calls, > and input is the *only* subsystem which needs it. > BTW, while listening to x32 resentation on LPC I realized that the need for compat tests on read/write paths in input subsystem is due to use of timeval in input_event structures. If x32 solved the time_t issue by moving to 64 bit times then input read/write should simply use native 64 bit operations. That still leaves sysfs and proc business of course... Thanks. -- Dmitry