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x-vs=clean score=-100 state=0 X-ME-VSCategory: clean X-CM-Envelope: MS4wfNEx1HnGpkqL1V/9QE8Uy+ySJn7gSEg6mnHQ0Mb9VJtgEWdksXJ72RDBuNzsXy3gALO3yjDLXaiN2B6LMH2c+OL0i1yLIQJMEVP95HUslFNnRMSA+s/Y 4EULME6FUrIZ4v73pRNnZ/PjZxlV0JA1ps3v6Ip6ZJGtov45xXoiF5eycBhdxnWyS4ls7CiUTItGXPn9i6/Q5DSNVwq9FO4yHJM68rhI179B2/GB5GTwiNAG X-CM-Analysis: v=2.3 cv=Tq3Iegfh c=1 sm=1 tr=0 a=UK1r566ZdBxH71SXbqIOeA==:117 a=UK1r566ZdBxH71SXbqIOeA==:17 a=kj9zAlcOel0A:10 a=VUJBJC2UJ8kA:10 a=VwQbUJbxAAAA:8 a=7CQSdrXTAAAA:8 a=iLjPVijIpMABvOM5TakA:9 a=CjuIK1q_8ugA:10 a=AjGcO6oz07-iQ99wixmX:22 a=a-qgeE7W1pNrGK8U0ZQC:22 X-ME-CMScore: 0 X-ME-CMCategory: none Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751687AbeEDWPW (ORCPT ); Fri, 4 May 2018 18:15:22 -0400 Received: from out1-smtp.messagingengine.com ([66.111.4.25]:36159 "EHLO out1-smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751622AbeEDWPU (ORCPT ); Fri, 4 May 2018 18:15:20 -0400 X-ME-Sender: Date: Fri, 4 May 2018 15:15:08 -0700 From: Greg KH To: Suzuki K Poulose Cc: stable@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, catalin.marinas@arm.com, mark.rutland@arm.com, will.deacon@arm.com Subject: Re: [PATCH] [stable] arm64: Add work around for Arm Cortex-A55 Erratum 1024718 Message-ID: <20180504221508.GD20328@kroah.com> References: <1525170364-21032-1-git-send-email-suzuki.poulose@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1525170364-21032-1-git-send-email-suzuki.poulose@arm.com> User-Agent: Mutt/1.9.5 (2018-04-13) 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: On Tue, May 01, 2018 at 11:26:04AM +0100, Suzuki K Poulose wrote: > commit ece1397cbc89c51914fae1aec729539cfd8bd62b upstream > > Some variants of the Arm Cortex-55 cores (r0p0, r0p1, r1p0) suffer > from an erratum 1024718, which causes incorrect updates when DBM/AP > bits in a page table entry is modified without a break-before-make > sequence. The work around is to disable the hardware DBM feature > on the affected cores. The hardware Access Flag management features > is not affected. > > The hardware DBM feature is a non-conflicting capability, i.e, the > kernel could handle cores using the feature and those without having > the features running at the same time. So this work around is detected > at early boot time, rather than delaying it until the CPUs are brought > up into the kernel with MMU turned on. This also avoids other complexities > with late CPUs turning online, with or without the hardware DBM features. > > Note: The upstream commit is on top of a reworked capability > infrastructure for arm64 heterogeneous systems, which allows > handling this later in the boot process. This backport > is based on the original version of the patch [0]. Folded the 3 > patches into this single commit, removing the unncessary bits. > > [0] https://lkml.kernel.org/r/20180116102323.3470-1-suzuki.poulose@arm.com > > Cc: stable@vger.kernel.org # v4.3 to v4.16 This only would apply to the 4.16.y tree. Can you provide working backports to 4.14.y, 4.9.y, and 4.4.y so I can queue them up there as well? thanks, greg k-h