From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Cyrus-Session-Id: sloti22d1t05-3269524-1523477450-2-10179382327425196555 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= 1523477450; b=L4HMZKrSfxGu8A8FUx09DuDYCErkDxRJQrGkiBV6lc5QxIYBs1 HQ/MqnQ/lX22SzMPLElmiuwUJ50xeTe00jcTgU/dxSlmCMCgvMwn/URJOqUO39FN 9alnP7QBZcqAI0kWqcJb5wkTlrj59yRkWX0ll5Y0Caaz9R0PEEly0F9BOBaoGjX7 zO7YjtXYUe0O/0ofqy6KASLMhSn9UsgLFKmzONYYZs+nKT19Noer7XtaTsayx+D7 UrGFtOefxFjSbkVp+Ay2J/oFMdtX/hJGbVtQdwz3bS7q9ZPM8HoCfuZ1i9tQddT7 m5FYV6X8A9rojymch5yFVwIJYRNnWPVGUb7w== 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=1523477450; bh=ZE5foLi+/0Ivobp6c6jIWsWpQF8UJQ x1YfMljfbJcAs=; b=as2IBHCZfLa4WIHnVLygCZAkwf4cyoOjuEHTbgtY8yMGTb jvRAOhCu6tobvuFTd3OWf07IcYbP/6qW/Fiw2M1HQ2tfRrG2xmOJ3vqxlMyw5WIh jTRkM+a/a/yoIercKdTAV6HfSTLbcE1qH7FbMhylb1jESz1fwAOS/yjIfSaG945m YraHTcPbp6Hdbpqs9LOELOuMd8ql4SCPgaV/OKWu8uX7deWY2cIrxZT98uziNCz1 MlzN1lL0sXvqQxViJ6GmbOKzRYLZyxc8Ir76v9eNZwz8+WMJ/aFZsNdcQe961vLM q/rj9aKGyjkbQ46u+qdWhnpOSp5k4UcPG6YyIftQ== ARC-Authentication-Results: i=1; mx4.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: mx4.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: MS4wfHzWZeXz/r+NLkHYdU+aEmm1BPeaH5fowDGGH6yzZYF8wDRswhzwWPxg5W5f1xVDpaqwiJym+zPa8YwSCmrfRX3UGkhfLyRd68JAyiHDNZF7wGyP8Iun pAmxhCan5hT4onbOyLFTqNB3hMEBPsAR5apE/qJ15ap3rdi2f74SL1hHqSKaQjrH4YV8NnumvV1cp3qb7Kadt1QyIWSAwqjOyUG/OCeVwqzDiACYQ1E5MoPr X-CM-Analysis: v=2.3 cv=JLoVTfCb 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 S933504AbeDKSyb (ORCPT ); Wed, 11 Apr 2018 14:54:31 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:34520 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933503AbeDKSya (ORCPT ); Wed, 11 Apr 2018 14:54:30 -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 4.9 047/310] x86/tsc: Provide tsc=unstable boot parameter Date: Wed, 11 Apr 2018 20:33:06 +0200 Message-Id: <20180411183624.275257753@linuxfoundation.org> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180411183622.305902791@linuxfoundation.org> References: <20180411183622.305902791@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: 4.9-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 @@ -366,6 +366,8 @@ 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; }