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=-5.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 28862C4708A for ; Thu, 27 May 2021 22:56:49 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id A258D60234 for ; Thu, 27 May 2021 22:56:48 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A258D60234 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux-foundation.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 746D86B006C; Thu, 27 May 2021 18:56:47 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 6EE796B006E; Thu, 27 May 2021 18:56:47 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 285406B0070; Thu, 27 May 2021 18:56:47 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0230.hostedemail.com [216.40.44.230]) by kanga.kvack.org (Postfix) with ESMTP id DB17C6B006C for ; Thu, 27 May 2021 18:56:46 -0400 (EDT) Received: from smtpin22.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 7839B180D0E98 for ; Thu, 27 May 2021 22:56:46 +0000 (UTC) X-FDA: 78188522412.22.0B93557 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf03.hostedemail.com (Postfix) with ESMTP id 0C63BC007757 for ; Thu, 27 May 2021 22:56:37 +0000 (UTC) Received: by mail.kernel.org (Postfix) with ESMTPSA id 017166135C; Thu, 27 May 2021 22:56:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1622156205; bh=ZVPbH5HQA5QJ3IYjGRfYN9DLXdb7eKyi5B1fvwZKHCU=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=qnYWqjPDdyZAlY7nCZx/PAyGK2OTuEaicJBV84zkM5rbnOPiaudihJrvRqGue8pxb 672OCCfUVuubWYdRZEMw+CMYUiMuhcPCY0b95aJTHoxGO95d7fOnIXcCmLz3jHaEQR 3bvygjhz7SeiiUGLt8zH8q6A1kWvDhp7pwsxvlBs= Date: Thu, 27 May 2021 15:56:44 -0700 From: Andrew Morton To: Catalin Marinas Cc: Mike Rapoport , Qian Cai , 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: <20210527155644.7792b4eaa16ec56645e1080c@linux-foundation.org> In-Reply-To: <20210527175047.GK8661@arm.com> References: <20210527175047.GK8661@arm.com> X-Mailer: Sylpheed 3.5.1 (GTK+ 2.24.31; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 0C63BC007757 Authentication-Results: imf03.hostedemail.com; dkim=pass header.d=linux-foundation.org header.s=korg header.b=qnYWqjPD; dmarc=none; spf=pass (imf03.hostedemail.com: domain of akpm@linux-foundation.org designates 198.145.29.99 as permitted sender) smtp.mailfrom=akpm@linux-foundation.org X-Rspamd-Server: rspam03 X-Stat-Signature: peekdgrpjddf9keyan3auoxbgbhnxzcn X-HE-Tag: 1622156197-113019 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 Thu, 27 May 2021 18:50:48 +0100 Catalin Marinas wrote: > > Can you please try Anshuman's patch "arm64/mm: Drop HAVE_ARCH_PFN_VALID": > > > > https://lore.kernel.org/lkml/1621947349-25421-1-git-send-email-anshuman.khandual@arm.com > > > > It seems to me that the check for memblock_is_memory() in > > arm64::pfn_valid() is what makes init_unavailable_range() to bail out for > > section parts that are not actually populated and then we have > > VM_BUG_ON_PAGE(PagePoisoned(p)) for these pages. > > I acked Anshuman's patch, I think they all need to go in together. That's neat. Specifically which patches are we referring to here?