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,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 58237C433E0 for ; Wed, 13 Jan 2021 08:56:55 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id D0F7B23384 for ; Wed, 13 Jan 2021 08:56:54 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D0F7B23384 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 498F38D0020; Wed, 13 Jan 2021 03:56:54 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 422678D0019; Wed, 13 Jan 2021 03:56:54 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 310C98D0020; Wed, 13 Jan 2021 03:56:54 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0118.hostedemail.com [216.40.44.118]) by kanga.kvack.org (Postfix) with ESMTP id 17DB88D0019 for ; Wed, 13 Jan 2021 03:56:54 -0500 (EST) Received: from smtpin09.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id D7799689C for ; Wed, 13 Jan 2021 08:56:53 +0000 (UTC) X-FDA: 77700146706.09.light17_1e036832751c Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin09.hostedemail.com (Postfix) with ESMTP id BC065180AD81A for ; Wed, 13 Jan 2021 08:56:53 +0000 (UTC) X-HE-Tag: light17_1e036832751c X-Filterd-Recvd-Size: 1961 Received: from mx2.suse.de (mx2.suse.de [195.135.220.15]) by imf44.hostedemail.com (Postfix) with ESMTP for ; Wed, 13 Jan 2021 08:56:53 +0000 (UTC) X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 1F116AA6F; Wed, 13 Jan 2021 08:56:52 +0000 (UTC) Date: Wed, 13 Jan 2021 09:56:49 +0100 From: Oscar Salvador To: Mike Rapoport Cc: Andrew Morton , Andrea Arcangeli , Baoquan He , Borislav Petkov , David Hildenbrand , "H. Peter Anvin" , Ingo Molnar , Mel Gorman , Michal Hocko , Mike Rapoport , Qian Cai , Thomas Gleixner , Vlastimil Babka , linux-kernel@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org Subject: Re: [PATCH v3 1/2] x86/setup: don't remove E820_TYPE_RAM for pfn 0 Message-ID: <20210113085644.GA24816@linux> References: <20210111194017.22696-1-rppt@kernel.org> <20210111194017.22696-2-rppt@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210111194017.22696-2-rppt@kernel.org> User-Agent: Mutt/1.10.1 (2018-07-13) 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 Mon, Jan 11, 2021 at 09:40:16PM +0200, Mike Rapoport wrote: > From: Mike Rapoport > > The first 4Kb of memory is a BIOS owned area and to avoid its allocation > for the kernel it was not listed in e820 tables as memory. As the result, > pfn 0 was never recognised by the generic memory management and it is not a > part of neither node 0 nor ZONE_DMA. So, since it never was added to memblock.memory structs, it was not initialized by init_unavailable_mem, right? -- Oscar Salvador SUSE L3