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 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 B0165C468C6 for ; Thu, 19 Jul 2018 09:42:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6E94C20693 for ; Thu, 19 Jul 2018 09:42:56 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6E94C20693 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.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 S1728050AbeGSKZN (ORCPT ); Thu, 19 Jul 2018 06:25:13 -0400 Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70]:45940 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726724AbeGSKZN (ORCPT ); Thu, 19 Jul 2018 06:25:13 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 2041980D; Thu, 19 Jul 2018 02:42:54 -0700 (PDT) Received: from [0.0.0.0] (e107985-lin.cambridge.arm.com [10.1.210.41]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id D0E6E3F246; Thu, 19 Jul 2018 02:42:52 -0700 (PDT) To: linux-arm-kernel@lists.infradead.org Cc: Russell King - ARM Linux , Morten Rasmussen , Qais Yousef , linux-kernel@vger.kernel.org From: Dietmar Eggemann Subject: arm: v4.18-rc5 with cpuidle on TC2 (A7 boot) spectre v2 issue Message-ID: <2abc6c11-2e8c-a4ea-6911-0f495d90ace6@arm.com> Date: Thu, 19 Jul 2018 11:42:50 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, running v4.18-rc5 (plus still missing "power: vexpress: fix corruption in notifier registration", otherwise I get this rcu_sched stall issue) on TC2 (A7 boot) with vanilla multi_v7_defconfig plus CONFIG_ARM_BIG_LITTLE_CPUIDLE=y gives me continuous: ... CPUX: Spectre v2: incorrect context switching function, system vulnerable ... messages. Work around is to disable CONFIG_HARDEN_BRANCH_PREDICTOR. -- Dietmar