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=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 01BC1C54E4A for ; Mon, 11 May 2020 12:34:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C079B206D6 for ; Mon, 11 May 2020 12:34:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730031AbgEKMe6 (ORCPT ); Mon, 11 May 2020 08:34:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49768 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1727019AbgEKMe5 (ORCPT ); Mon, 11 May 2020 08:34:57 -0400 Received: from Galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 92356C061A0C for ; Mon, 11 May 2020 05:34:57 -0700 (PDT) Received: from p5de0bf0b.dip0.t-ipconnect.de ([93.224.191.11] helo=nanos.tec.linutronix.de) by Galois.linutronix.de with esmtpsa (TLS1.2:DHE_RSA_AES_256_CBC_SHA256:256) (Exim 4.80) (envelope-from ) id 1jY7dq-0005NH-GU; Mon, 11 May 2020 14:34:42 +0200 Received: by nanos.tec.linutronix.de (Postfix, from userid 1000) id DE8FAFFBF8; Mon, 11 May 2020 14:34:41 +0200 (CEST) From: Thomas Gleixner To: Radoslaw Biernacki , Paul Menzel Cc: x86@kernel.org, Ross Zwisler , Daniel Drake , Andy Lutomirski , Borislav Petkov , "H . Peter Anvin" , Peter Zijlstra , Len Brown , Linux Upstreaming Team , "Rafael J . Wysocki" , Thorsten Leemhuis , LKML Subject: Re: [PATCH] x86/tsc: Use hard-coded crystal clock for Skylake mobile In-Reply-To: References: <20200509113717.9084-1-pmenzel@molgen.mpg.de> <87eerr3ppb.fsf@nanos.tec.linutronix.de> Date: Mon, 11 May 2020 14:34:41 +0200 Message-ID: <87y2py6466.fsf@nanos.tec.linutronix.de> MIME-Version: 1.0 Content-Type: text/plain X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Radoslaw Biernacki writes: > We found that regression only on specific SKU which was used in one > model of ChromeBook. > What's interesting is that some other SKU is fine. > > The consequences of this are rather not trivial, > so this was considered a quickfix and temporary till we develop > something better. > In contrast to ChromeOs, I know that there is no way of finding if > there are in fact regressions on generic kernel in the field (this is > SKU dependent), > but we also think that this problem should be addressed in a better > way (if possible). Fix the BIOS to setup the CPUID/MSRs correctly? Thanks, tglx