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=-5.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no 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 3F444C433E0 for ; Tue, 26 Jan 2021 19:48:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 01A6D22B2C for ; Tue, 26 Jan 2021 19:48:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387842AbhAZFeb (ORCPT ); Tue, 26 Jan 2021 00:34:31 -0500 Received: from foss.arm.com ([217.140.110.172]:44824 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727309AbhAYKYN (ORCPT ); Mon, 25 Jan 2021 05:24:13 -0500 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id CF9F01042; Mon, 25 Jan 2021 01:51:47 -0800 (PST) Received: from [10.163.91.197] (unknown [10.163.91.197]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 28E243F66E; Mon, 25 Jan 2021 01:51:43 -0800 (PST) Subject: Re: [PATCH V4 0/4] mm/memory_hotplug: Pre-validate the address range with platform To: David Hildenbrand , linux-mm@kvack.org, akpm@linux-foundation.org, hca@linux.ibm.com, catalin.marinas@arm.com Cc: Oscar Salvador , Vasily Gorbik , Will Deacon , Ard Biesheuvel , Mark Rutland , linux-arm-kernel@lists.infradead.org, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org References: <1611543532-18698-1-git-send-email-anshuman.khandual@arm.com> From: Anshuman Khandual Message-ID: <8260d6fe-7df5-c667-2514-0d94cf87d31c@arm.com> Date: Mon, 25 Jan 2021 15:22:08 +0530 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 1/25/21 2:55 PM, David Hildenbrand wrote: > On 25.01.21 03:58, Anshuman Khandual wrote: >> This series adds a mechanism allowing platforms to weigh in and prevalidate >> incoming address range before proceeding further with the memory hotplug. >> This helps prevent potential platform errors for the given address range, >> down the hotplug call chain, which inevitably fails the hotplug itself. >> >> This mechanism was suggested by David Hildenbrand during another discussion >> with respect to a memory hotplug fix on arm64 platform. >> >> https://lore.kernel.org/linux-arm-kernel/1600332402-30123-1-git-send-email-anshuman.khandual@arm.com/ >> >> This mechanism focuses on the addressibility aspect and not [sub] section >> alignment aspect. Hence check_hotplug_memory_range() and check_pfn_span() >> have been left unchanged. Wondering if all these can still be unified in >> an expanded memhp_range_allowed() check, that can be called from multiple >> memory hot add and remove paths. >> >> This series applies on v5.11-rc5 and has been tested on arm64. But only >> build tested on s390. >> > > Note that this fails to apply right now to both, -next and Linus' tree. > Do you have a branch with he patches on top I can use for a quick test? > Thanks > Applied all four patches on v5.11-rc5. https://gitlab.arm.com/linux-arm/linux-anshuman/-/tree/mm/hotplug_callback/v4/