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 C2A6BC47082 for ; Wed, 26 May 2021 13:04:34 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 59F2C613B4 for ; Wed, 26 May 2021 13:04:34 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 59F2C613B4 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 622AB6B0036; Wed, 26 May 2021 09:04:33 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 5CEC86B006E; Wed, 26 May 2021 09:04:33 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 1D5B26B0070; Wed, 26 May 2021 09:04:33 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0092.hostedemail.com [216.40.44.92]) by kanga.kvack.org (Postfix) with ESMTP id D19566B0036 for ; Wed, 26 May 2021 09:04:32 -0400 (EDT) Received: from smtpin03.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 4A9118249980 for ; Wed, 26 May 2021 13:04:32 +0000 (UTC) X-FDA: 78183401184.03.4F20DEF Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf29.hostedemail.com (Postfix) with ESMTP id B7BB92D4 for ; Wed, 26 May 2021 13:04:22 +0000 (UTC) Received: by mail.kernel.org (Postfix) with ESMTPSA id 1BBA0611CD; Wed, 26 May 2021 13:04:28 +0000 (UTC) Date: Wed, 26 May 2021 14:04:26 +0100 From: Catalin Marinas To: "Qian Cai (QUIC)" Cc: Mike Rapoport , Andrew Morton , David Hildenbrand , Anshuman Khandual , Ard Biesheuvel , Linux Memory Management List , Will Deacon , Marc Zyngier , Linux Kernel Mailing List , Linux ARM Subject: Re: Arm64 crash while reading memory sysfs Message-ID: <20210526130426.GD19992@arm.com> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) X-Rspamd-Queue-Id: B7BB92D4 Authentication-Results: imf29.hostedemail.com; dkim=none; dmarc=fail reason="SPF not aligned (relaxed), No valid DKIM" header.from=arm.com (policy=none); spf=pass (imf29.hostedemail.com: domain of cmarinas@kernel.org designates 198.145.29.99 as permitted sender) smtp.mailfrom=cmarinas@kernel.org X-Rspamd-Server: rspam04 X-Stat-Signature: 8zkrdf1gxmuipo6u5i1ayce7qjr9w6jx X-HE-Tag: 1622034262-700414 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 Wed, May 26, 2021 at 12:09:14PM +0000, Qian Cai (QUIC) wrote: > [ 0.000000] Early memory node ranges > [ 0.000000] node 0: [mem 0x0000000090000000-0x0000000091ffffff] Maybe de-selecting HOLES_IN_ZONE is not correct for arm64 in all circumstances. In a configuration with 64K pages, MAX_ORDER is 14, MAX_ORDER_NR_PAGES is 8192, so a 2^29 address range. However, the above range starts on 2^28 boundary. SECTION_SIZE_BITS is 29 in this configuration but the corresponding mem_map[] in the first half of the first section is probably not marked as reserved as we'd do for NOMAP. -- Catalin