Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757676AbYFBQDy (ORCPT ); Mon, 2 Jun 2008 12:03:54 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753666AbYFBQDp (ORCPT ); Mon, 2 Jun 2008 12:03:45 -0400 Received: from earthlight.etchedpixels.co.uk ([81.2.110.250]:44554 "EHLO lxorguk.ukuu.org.uk" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752627AbYFBQDo (ORCPT ); Mon, 2 Jun 2008 12:03:44 -0400 Date: Mon, 2 Jun 2008 16:48:40 +0100 From: Alan Cox To: Rodolfo Giometti Cc: Andrew Morton , linux-kernel@vger.kernel.org Subject: Re: LinuxPPS low-level IRQs timestamps & ldisc Message-ID: <20080602164840.0dc9cb96@core> In-Reply-To: <20080602145603.GG26854@enneenne.com> References: <20080601161510.GA26854@enneenne.com> <20080602075113.60d0fdf8@core> <20080602092551.GC26854@enneenne.com> <20080602150257.54692f35@core> <20080602145603.GG26854@enneenne.com> X-Mailer: Claws Mail 3.3.1 (GTK+ 2.12.5; x86_64-redhat-linux-gnu) Organization: Red Hat UK Cyf., Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SL4 1TE, Y Deyrnas Gyfunol. Cofrestrwyd yng Nghymru a Lloegr o'r rhif cofrestru 3798903 Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 553 Lines: 15 > I prefere avoid the if clause for getnstimeofday() since each > instruction delay may decrease time precision, so: Why should everyone else pay the cost of the getnstimeofday they don't need ? The single conditional check at the start won't make the slightest material difference to your accuracy. Alan -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/