From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Cyrus-Session-Id: sloti22d1t05-3374234-1523481938-2-2280107650941682579 X-Sieve: CMU Sieve 3.0 X-Spam-known-sender: no X-Spam-score: 0.0 X-Spam-hits: BAYES_00 -1.9, HEADER_FROM_DIFFERENT_DOMAINS 0.25, MAILING_LIST_MULTI -1, ME_NOAUTH 0.01, RCVD_IN_DNSWL_HI -5, LANGUAGES en, BAYES_USED global, SA_VERSION 3.4.0 X-Spam-source: IP='209.132.180.67', Host='vger.kernel.org', Country='US', FromHeader='org', MailFrom='org' X-Spam-charsets: plain='UTF-8' X-Resolved-to: greg@kroah.com X-Delivered-to: greg@kroah.com X-Mail-from: stable-owner@vger.kernel.org ARC-Seal: i=1; a=rsa-sha256; cv=none; d=messagingengine.com; s=fm2; t= 1523481938; b=SLsSvdZ20YGrvDzIKNe12aTs+xdiKGkYB5ut3j69rw8ySG0Hkr x70BbRGrjFjY2tEx5Ax/fPZMELxM3y80jLdzXOAiTqJyR66EcBADUFmcPt3nwoXq GKlQFrFItPKt7yYo+cEV0vyH6ZShqSKrqO8hBVW+CsZVqPGraCkYpCBdXf65H7nN 1Eagkl2E7Y7cUaTz0ZfgzmA1WVh0nZDbNAN5qRZsLpISPO1Kjeva32LN/WisezJo VwOjjg/rUhEEoTU77dPmzX/29gDpjgfgaCFFKylOa88PQQvP7REHA8iOzn50P14O kjAYtSJBQrUvvmD1k9XzaN2b/qpjm+DIy8TA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=from:to:cc:subject:date:message-id :in-reply-to:references:mime-version:content-type:sender :list-id; s=fm2; t=1523481938; bh=XqmZujFw7RxLGO6t6Jd8YFXCSfY2ZO WiLc6b6mV8ABM=; b=TnN1NyVM9deDBfhnJqm/VG++1eiO7TkiJniW3aibMHeJKV 9IUPya51nke8l4Y1yrz7BotOPN0lk1+EzE4vSpo+HBaLq+NniFTCXa5BGhrNJCVN xaKMjwdv5JJB92UWj7gTkjFgKxpBL1GbwuexzwexIEF26D2kFmnGbeyMFlXh96d8 I3nRoBjVMn3w8WZjCWtvgMN7sLEPLXJklVEkzxoAYY0SLUlVRanUC8Ml7yvXsvea /pxi1FFwn2dc7cVQUmrRn7FiGLgBsrfxBhOmkeW2+K5Rf3GfoGrRlqM7Pammdw5I ei2HBpFgxHqddZziSp4X8Lr98l+X8ALnfAXIptjw== ARC-Authentication-Results: i=1; mx5.messagingengine.com; arc=none (no signatures found); dkim=none (no signatures found); dmarc=none (p=none,has-list-id=yes,d=none) header.from=linuxfoundation.org; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=stable-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-cm=none score=0; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=linuxfoundation.org header.result=pass header_is_org_domain=yes; x-vs=clean score=-100 state=0 Authentication-Results: mx5.messagingengine.com; arc=none (no signatures found); dkim=none (no signatures found); dmarc=none (p=none,has-list-id=yes,d=none) header.from=linuxfoundation.org; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=stable-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-cm=none score=0; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=linuxfoundation.org header.result=pass header_is_org_domain=yes; x-vs=clean score=-100 state=0 X-ME-VSCategory: clean X-CM-Envelope: MS4wfMikUSI4wfwpjCfbQCAc/+UnbgURGAPxul7caCRTo7gPYpzDz5QeGXBu4oCsuuCHRy069wK6y8Wb4NCOF5EbravJ0o6CVr8ELLlyJkWyI1TXqvxm4ngp mGxl1UXI4iWmtxI+ZuqrOOBOh5ee+1mysUGBu6VN4NX3Fp1oOMXCFic+ede2k/v6ceLs6LhyeZ/5QaiYFiGORCXsUFhmulO9N9OCt7iMnyLR4qYmLZ58mqL0 X-CM-Analysis: v=2.3 cv=NPP7BXyg c=1 sm=1 tr=0 a=UK1r566ZdBxH71SXbqIOeA==:117 a=UK1r566ZdBxH71SXbqIOeA==:17 a=IkcTkHD0fZMA:10 a=Kd1tUaAdevIA:10 a=JfrnYn6hAAAA:8 a=Z4Rwk6OoAAAA:8 a=VwQbUJbxAAAA:8 a=yMhMjlubAAAA:8 a=ag1SF4gXAAAA:8 a=xFwlslFXJhO3HYaR-E8A:9 a=QEXdDO2ut3YA:10 a=1CNFftbPRP8L7MoqJWF3:22 a=HkZW87K1Qel5hWWM3VKY:22 a=AjGcO6oz07-iQ99wixmX:22 a=Yupwre4RP9_Eg_Bd0iYG:22 X-ME-CMScore: 0 X-ME-CMCategory: none Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754097AbeDKSia (ORCPT ); Wed, 11 Apr 2018 14:38:30 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:55386 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754050AbeDKSi2 (ORCPT ); Wed, 11 Apr 2018 14:38:28 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, "Peter Zijlstra (Intel)" , Linus Torvalds , Mike Galbraith , Thomas Gleixner , Ingo Molnar , Sasha Levin Subject: [PATCH 3.18 020/121] x86/tsc: Provide tsc=unstable boot parameter Date: Wed, 11 Apr 2018 20:35:23 +0200 Message-Id: <20180411183457.367005352@linuxfoundation.org> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180411183456.195010921@linuxfoundation.org> References: <20180411183456.195010921@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 3.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Peter Zijlstra [ Upstream commit 8309f86cd41e8714526867177facf7a316d9be53 ] Since the clocksource watchdog will only detect broken TSC after the fact, all TSC based clocks will likely have observed non-continuous values before/when switching away from TSC. Therefore only thing to fully avoid random clock movement when your BIOS randomly mucks with TSC values from SMI handlers is reporting the TSC as unstable at boot. Signed-off-by: Peter Zijlstra (Intel) Cc: Linus Torvalds Cc: Mike Galbraith Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- arch/x86/kernel/tsc.c | 2 ++ 1 file changed, 2 insertions(+) --- a/arch/x86/kernel/tsc.c +++ b/arch/x86/kernel/tsc.c @@ -356,6 +356,8 @@ static int __init tsc_setup(char *str) tsc_clocksource_reliable = 1; if (!strncmp(str, "noirqtime", 9)) no_sched_irq_time = 1; + if (!strcmp(str, "unstable")) + mark_tsc_unstable("boot parameter"); return 1; }