Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934469AbdC3XAx (ORCPT ); Thu, 30 Mar 2017 19:00:53 -0400 Received: from userp1040.oracle.com ([156.151.31.81]:45568 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932294AbdC3XAw (ORCPT ); Thu, 30 Mar 2017 19:00:52 -0400 Subject: Re: [PATCH] x86/xen/time: set ->min_delta_ticks and ->max_delta_ticks To: Nicolai Stange , Thomas Gleixner References: <20170326134403.16226-1-nicstange@gmail.com> <20170330200642.8228-1-nicstange@gmail.com> Cc: John Stultz , linux-kernel@vger.kernel.org, Juergen Gross , Ingo Molnar , "H. Peter Anvin" , x86@kernel.org, xen-devel@lists.xenproject.org From: Boris Ostrovsky Message-ID: Date: Thu, 30 Mar 2017 18:59:47 -0400 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.6.0 MIME-Version: 1.0 In-Reply-To: <20170330200642.8228-1-nicstange@gmail.com> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit X-Source-IP: aserv0021.oracle.com [141.146.126.233] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 874 Lines: 19 On 03/30/2017 04:06 PM, Nicolai Stange wrote: > In preparation for making the clockevents core NTP correction aware, > all clockevent device drivers must set ->min_delta_ticks and > ->max_delta_ticks rather than ->min_delta_ns and ->max_delta_ns: a > clockevent device's rate is going to change dynamically and thus, the > ratio of ns to ticks ceases to stay invariant. > > Make the x86 arch's xen clockevent driver initialize these fields properly. > > This patch alone doesn't introduce any change in functionality as the > clockevents core still looks exclusively at the (untouched) ->min_delta_ns > and ->max_delta_ns. As soon as this has changed, a followup patch will > purge the initialization of ->min_delta_ns and ->max_delta_ns from this > driver. > > Signed-off-by: Nicolai Stange Reviewed-by: Boris Ostrovsky