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,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 1C9F8C433ED for ; Thu, 22 Apr 2021 09:58:26 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 951ED60E0C for ; Thu, 22 Apr 2021 09:58:25 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 951ED60E0C Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 079CB6B006C; Thu, 22 Apr 2021 05:58:25 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 028766B006E; Thu, 22 Apr 2021 05:58:24 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id E333B6B0070; Thu, 22 Apr 2021 05:58:24 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0159.hostedemail.com [216.40.44.159]) by kanga.kvack.org (Postfix) with ESMTP id C8A7D6B006C for ; Thu, 22 Apr 2021 05:58:24 -0400 (EDT) Received: from smtpin34.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 6FF38180AC483 for ; Thu, 22 Apr 2021 09:58:24 +0000 (UTC) X-FDA: 78059552928.34.DB33209 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by imf11.hostedemail.com (Postfix) with ESMTP id 2EEEF200025C for ; Thu, 22 Apr 2021 09:58:10 +0000 (UTC) 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 0593711D4; Thu, 22 Apr 2021 02:58:23 -0700 (PDT) Received: from [10.163.75.119] (unknown [10.163.75.119]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 39A503F774; Thu, 22 Apr 2021 02:58:19 -0700 (PDT) Subject: Re: [RFC V2] mm: Enable generic pfn_valid() to handle early sections with memmap holes To: Mike Rapoport , David Hildenbrand Cc: linux-mm@kvack.org, akpm@linux-foundation.org, Catalin Marinas , Will Deacon , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org References: <20210422061902.21614-1-rppt@kernel.org> <1619077823-3819-1-git-send-email-anshuman.khandual@arm.com> From: Anshuman Khandual Message-ID: Date: Thu, 22 Apr 2021 15:29:10 +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 X-Stat-Signature: xs8q13pzh4apwmej98x4c1j8nkxj698w X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 2EEEF200025C Received-SPF: none (arm.com>: No applicable sender policy available) receiver=imf11; identity=mailfrom; envelope-from=""; helo=foss.arm.com; client-ip=217.140.110.172 X-HE-DKIM-Result: none/none X-HE-Tag: 1619085490-277247 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 4/22/21 3:12 PM, Mike Rapoport wrote: > The "generic" pfn_valid() is only available with CONFIG_SPARSEMEM. > With FLATMEM it's wild west: > > $ git grep -w "define pfn_valid" arch/*/include/asm/ | wc -l > 22 > > This would actually mean that we still need arm64::pfn_valid() for the > FLATMEM case. SPARSEMEM would be the only memory model going forward. https://patchwork.kernel.org/project/linux-arm-kernel/patch/20210420093559.23168-1-catalin.marinas@arm.com/