From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754016AbdDCPtX (ORCPT ); Mon, 3 Apr 2017 11:49:23 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:35740 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753355AbdDCPtU (ORCPT ); Mon, 3 Apr 2017 11:49:20 -0400 DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org F19B060D3B Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=rkuo@codeaurora.org Date: Mon, 3 Apr 2017 10:49:16 -0500 From: Richard Kuo To: Nicolai Stange Cc: John Stultz , linux-kernel@vger.kernel.org, Thomas Gleixner , linux-hexagon@vger.kernel.org Subject: Re: [PATCH] hexagon/time: set ->min_delta_ticks and ->max_delta_ticks Message-ID: <20170403154916.GA19890@codeaurora.org> References: <20170326134403.16226-1-nicstange@gmail.com> <20170330194332.6915-1-nicstange@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20170330194332.6915-1-nicstange@gmail.com> User-Agent: Mutt/1.5.24 (2015-08-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Mar 30, 2017 at 09:43:32PM +0200, 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 hexagon arch's 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 > --- > > Notes: > This prerequisite patch is part of a larger effort to feed NTP > corrections into the clockevent devices' frequencies and thus > avoiding their notion of time to diverge from the system's > one. If you're interested, the current state of the whole series > can be found at [1]. > > If you haven't got any objections and these prerequisites get > merged by 4.12 everywhere, I'll proceed with the remainder of > this series in 4.13. > > Applicable to next-20170324 as well as to John' Stultz tree [2]. > > [1] > git://nicst.de/linux.git cev-freq-adj.v10.fortglx-4.12-time > https://nicst.de/git/?p=linux.git;a=shortlog;h=refs/heads/cev-freq-adj.v10.fortglx-4.12-time > > [2] > https://git.linaro.org/people/john.stultz/linux.git fortglx/4.12/time > > arch/hexagon/kernel/time.c | 2 ++ > 1 file changed, 2 insertions(+) Acked-by: Richard Kuo -- Qualcomm Innovation Center, Inc. The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project