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_PASS,URIBL_BLOCKED autolearn=ham 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 BEE63ECDFB8 for ; Thu, 19 Jul 2018 22:32:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7B68D20671 for ; Thu, 19 Jul 2018 22:32:27 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7B68D20671 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=zytor.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731439AbeGSXRe (ORCPT ); Thu, 19 Jul 2018 19:17:34 -0400 Received: from terminus.zytor.com ([198.137.202.136]:36535 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730369AbeGSXRe (ORCPT ); Thu, 19 Jul 2018 19:17:34 -0400 Received: from terminus.zytor.com (localhost [127.0.0.1]) by terminus.zytor.com (8.15.2/8.15.2) with ESMTPS id w6JMWILh2439619 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Thu, 19 Jul 2018 15:32:18 -0700 Received: (from tipbot@localhost) by terminus.zytor.com (8.15.2/8.15.2/Submit) id w6JMWIHf2439616; Thu, 19 Jul 2018 15:32:18 -0700 Date: Thu, 19 Jul 2018 15:32:18 -0700 X-Authentication-Warning: terminus.zytor.com: tipbot set sender to tipbot@zytor.com using -f From: tip-bot for Pavel Tatashin Message-ID: Cc: linux-kernel@vger.kernel.org, mingo@kernel.org, tglx@linutronix.de, pasha.tatashin@oracle.com, hpa@zytor.com Reply-To: pasha.tatashin@oracle.com, hpa@zytor.com, linux-kernel@vger.kernel.org, mingo@kernel.org, tglx@linutronix.de In-Reply-To: <20180719205545.16512-22-pasha.tatashin@oracle.com> References: <20180719205545.16512-22-pasha.tatashin@oracle.com> To: linux-tip-commits@vger.kernel.org Subject: [tip:x86/timers] x86/tsc: Use TSC as sched clock early Git-Commit-ID: 4763f03d3d186ce8a1125844790152d76804ad60 X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: 4763f03d3d186ce8a1125844790152d76804ad60 Gitweb: https://git.kernel.org/tip/4763f03d3d186ce8a1125844790152d76804ad60 Author: Pavel Tatashin AuthorDate: Thu, 19 Jul 2018 16:55:40 -0400 Committer: Thomas Gleixner CommitDate: Fri, 20 Jul 2018 00:02:42 +0200 x86/tsc: Use TSC as sched clock early All prerequesites for enabling TSC as sched clock early in the boot process are available now: - Early attempt of TSC calibration - Early availablity of static branch patching If TSC frequency can be established in the early calibration, enable the static key which switches sched clock to use TSC. [ tglx: Massaged changelog ] Signed-off-by: Pavel Tatashin Signed-off-by: Thomas Gleixner Cc: steven.sistare@oracle.com Cc: daniel.m.jordan@oracle.com Cc: linux@armlinux.org.uk Cc: schwidefsky@de.ibm.com Cc: heiko.carstens@de.ibm.com Cc: john.stultz@linaro.org Cc: sboyd@codeaurora.org Cc: hpa@zytor.com Cc: douly.fnst@cn.fujitsu.com Cc: peterz@infradead.org Cc: prarit@redhat.com Cc: feng.tang@intel.com Cc: pmladek@suse.com Cc: gnomes@lxorguk.ukuu.org.uk Cc: linux-s390@vger.kernel.org Cc: boris.ostrovsky@oracle.com Cc: jgross@suse.com Cc: pbonzini@redhat.com Link: https://lkml.kernel.org/r/20180719205545.16512-22-pasha.tatashin@oracle.com --- arch/x86/kernel/tsc.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c index 7ea0718a4c75..9277ae9b68b3 100644 --- a/arch/x86/kernel/tsc.c +++ b/arch/x86/kernel/tsc.c @@ -1408,6 +1408,7 @@ void __init tsc_early_init(void) /* Sanitize TSC ADJUST before cyc2ns gets initialized */ tsc_store_and_check_tsc_adjust(true); cyc2ns_init_boot_cpu(); + static_branch_enable(&__use_tsc); } void __init tsc_init(void)