From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751902AbeFEP2B (ORCPT ); Tue, 5 Jun 2018 11:28:01 -0400 Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70]:57478 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751665AbeFEP17 (ORCPT ); Tue, 5 Jun 2018 11:27:59 -0400 Cc: Sudeep Holla , ACPI Devel Maling List , "Rafael J . Wysocki" , Catalin Marinas , Jeremy Linton , Morten Rasmussen , Linux ARM , Linux Kernel Mailing List , Hanjun Guo , Geert Uytterhoeven , Will Deacon Subject: Re: [PATCH v2 3/3] arm64: disable ACPI PPTT support temporarily To: "Rafael J. Wysocki" References: <1528209304-3280-1-git-send-email-sudeep.holla@arm.com> <1528209304-3280-3-git-send-email-sudeep.holla@arm.com> From: Sudeep Holla Organization: ARM Message-ID: Date: Tue, 5 Jun 2018 16:27:55 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 05/06/18 16:02, Rafael J. Wysocki wrote: > On Tue, Jun 5, 2018 at 4:35 PM, Sudeep Holla wrote: >> Currently, ARM64 doesn't support updating the CPU topology masks on >> CPU hotplug operations. ACPI PPTT support rely on that missing feature >> which is technically not incorrect. Instead of reverting all the PPTT >> support, let's keep it simple and disable ACPI PPTT support on ARM64 >> for time-being until the topology updates are added for CPU hotplug >> operations. > > When is that going to happen? > > Nobody else uses PPTT now. > No we need it on ARM64. I have even the fixes for the original issue but it's bit invasive and too late as we are already in the merge window. It needs to be tested on NUMA platforms, I have asked for that explicitly. -- Regards, Sudeep