From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753430Ab3LTEbm (ORCPT ); Thu, 19 Dec 2013 23:31:42 -0500 Received: from terminus.zytor.com ([198.137.202.10]:39500 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752088Ab3LTEbk (ORCPT ); Thu, 19 Dec 2013 23:31:40 -0500 Message-ID: <52B3C7F8.3040901@zytor.com> Date: Thu, 19 Dec 2013 20:30:48 -0800 From: "H. Peter Anvin" User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.2.0 MIME-Version: 1.0 To: joeyli , Matt Fleming CC: "Rafael J. Wysocki" , Alessandro Zummo , Matthew Garrett , Elliott@hp.com, samer.el-haj-mahmoud@hp.com, Oliver Neukum , werner@suse.com, trenn@suse.de, JBeulich@suse.com, linux-kernel@vger.kernel.org, rtc-linux@googlegroups.com, x86@kernel.org, "linux-efi@vger.kernel.org" , linux-acpi@vger.kernel.org, Matt Fleming , Thomas Gleixner , Ingo Molnar Subject: Re: [RFC PATCH 06/14] rtc-efi: register rtc-efi device when EFI enabled References: <1387439515-8926-1-git-send-email-jlee@suse.com> <1387439515-8926-7-git-send-email-jlee@suse.com> <20131219140918.GF3145@console-pimps.org> <1387513491.3539.4345.camel@linux-s257.site> In-Reply-To: <1387513491.3539.4345.camel@linux-s257.site> X-Enigmail-Version: 1.6 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 12/19/2013 08:24 PM, joeyli wrote: > > I agreed, but userspace application should not be too often to access > RTC. Maybe only when system boot and set timezone. > This is, quite frankly, an idiotic argument. Userspace doesn't access the RTC, the kernel does, and if the underlying implementation is broken it doesn't matter if it is accessed one time or a thousand. For the record, in most cases the RTC gets accessed about every 15 minutes to update the time based on network time. -hpa