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=-10.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,MAILING_LIST_MULTI, NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 A901DC433ED for ; Wed, 12 May 2021 03:13:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 60E7061942 for ; Wed, 12 May 2021 03:13:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230109AbhELDOk (ORCPT ); Tue, 11 May 2021 23:14:40 -0400 Received: from szxga07-in.huawei.com ([45.249.212.35]:2449 "EHLO szxga07-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229848AbhELDOi (ORCPT ); Tue, 11 May 2021 23:14:38 -0400 Received: from DGGEMS412-HUB.china.huawei.com (unknown [172.30.72.60]) by szxga07-in.huawei.com (SkyGuard) with ESMTP id 4Fg0D93P73zCrTC; Wed, 12 May 2021 11:10:49 +0800 (CST) Received: from [10.174.177.243] (10.174.177.243) by DGGEMS412-HUB.china.huawei.com (10.3.19.212) with Microsoft SMTP Server id 14.3.498.0; Wed, 12 May 2021 11:13:29 +0800 Subject: Re: [PATCH v4 0/4] arm64: drop pfn_valid_within() and simplify pfn_valid() To: Mike Rapoport , Andrew Morton CC: Anshuman Khandual , Ard Biesheuvel , Catalin Marinas , "David Hildenbrand" , Marc Zyngier , Mark Rutland , Mike Rapoport , Will Deacon , , , , References: <20210511100550.28178-1-rppt@kernel.org> From: Kefeng Wang Message-ID: Date: Wed, 12 May 2021 11:13:28 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <20210511100550.28178-1-rppt@kernel.org> Content-Type: text/plain; charset="utf-8"; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Originating-IP: [10.174.177.243] X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2021/5/11 18:05, Mike Rapoport wrote: > From: Mike Rapoport > > Hi, > > These patches aim to remove CONFIG_HOLES_IN_ZONE and essentially hardwire > pfn_valid_within() to 1. > > The idea is to mark NOMAP pages as reserved in the memory map and restore > the intended semantics of pfn_valid() to designate availability of struct > page for a pfn. > > With this the core mm will be able to cope with the fact that it cannot use > NOMAP pages and the holes created by NOMAP ranges within MAX_ORDER blocks > will be treated correctly even without the need for pfn_valid_within. > > The patches are boot tested on qemu-system-aarch64. > > I beleive it would be best to route these via mmotm tree. Reviewed-by: Kefeng Wang