From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C57C9C433DB for ; Wed, 10 Feb 2021 12:45:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 97C7B64E32 for ; Wed, 10 Feb 2021 12:45:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231892AbhBJMpJ (ORCPT ); Wed, 10 Feb 2021 07:45:09 -0500 Received: from mail.jv-coder.de ([5.9.79.73]:38498 "EHLO mail.jv-coder.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230200AbhBJMnT (ORCPT ); Wed, 10 Feb 2021 07:43:19 -0500 Received: from [192.168.178.40] (unknown [188.192.1.224]) by mail.jv-coder.de (Postfix) with ESMTPSA id D947B9F713; Wed, 10 Feb 2021 12:42:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=jv-coder.de; s=dkim; t=1612960938; bh=jobc+08FAOyjmkbANrhe+gJitxkT/44/+3m3HJpaN80=; h=To:From:Subject:Message-ID:Date:MIME-Version; b=ZijUB3wnnfuxuaLfy+tpo4xCu41WohXoxZtnN0eX4G5ZJ1FfaRjsXvTs0Rd7v8Qk1 YBcijXKiMMdPr/2U6ntBdhHspCwyMaJub0TWq6K1pSldaNUhuOYi/bcXZwMNLnRVnb Ir7ucsgiKMXs6sytttnVvhoR9Hp7Ur5xia8qHYsA= To: stable@vger.kernel.org, Ingo Molnar , Miroslav Lichvar , John Stultz From: Joerg Vehlow Subject: [4.14] Failing selftest timer/adjtick Message-ID: Date: Wed, 10 Feb 2021 13:43:10 +0100 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.7.1 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org Hi, we found that on the selftest timer/adjtick fails on arm64 (tested on some renesas board and in qemu) quite frequently. By bisecting the kernel I found that it stopped failing after commit 78b98e3c5a66 (timekeeping/ntp: Determine the multiplier directly from NTP tick length). Should this patch be applied to 4.14 and is it even possible or could it break something else? Thanks, Joerg