From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751580AbXA0Mtx (ORCPT ); Sat, 27 Jan 2007 07:49:53 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751685AbXA0Mtx (ORCPT ); Sat, 27 Jan 2007 07:49:53 -0500 Received: from einhorn.in-berlin.de ([192.109.42.8]:41941 "EHLO einhorn.in-berlin.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751564AbXA0Mtx (ORCPT ); Sat, 27 Jan 2007 07:49:53 -0500 X-Envelope-From: stefanr@s5r6.in-berlin.de Message-ID: <45BB4A33.4070206@s5r6.in-berlin.de> Date: Sat, 27 Jan 2007 13:48:51 +0100 From: Stefan Richter User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.0.9) Gecko/20070121 SeaMonkey/1.0.7 MIME-Version: 1.0 To: Pieter Palmers CC: linux1394-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org Subject: Re: [RFC] cycle timer read extension for raw1394/libraw1394 References: <45BA5CFD.6070900@joow.be> <45BB27AF.7030007@s5r6.in-berlin.de> <45BB2D67.7030608@joow.be> In-Reply-To: <45BB2D67.7030608@joow.be> X-Enigmail-Version: 0.94.1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Pieter Palmers wrote: > Stefan Richter wrote: >> Thus? >> preempt_disable(); >> local_irq_save(flags); >> >> read_cycle_timer; >> read_time_of_day; >> >> local_irq_restore(flags); >> preempt_enable(); >> >> in hpsb_read_cycle_timer. > My main issue was that I still had to figure out how to do this... I'm a > very occasional kernel space programmer. Unfortunately me too, and the level of ieee1394 driver maintenance shows it. > Thanks for the hint, I'll do it like this. > > I still have to check if I don't introduce a too long non-preemptible > path though. It's a simple MMIO read (readl) and the do_gettimeofday, which should be fine. -- Stefan Richter -=====-=-=== ---= ==-== http://arcgraph.de/sr/