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=-7.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS 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 0E3C7C433DF for ; Tue, 14 Jul 2020 00:24:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E044921883 for ; Tue, 14 Jul 2020 00:24:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1594686247; bh=GP8Bw1UugpYVhlN8HeHVsurVA65SyC7kNKoM/SSNjAA=; h=Date:From:To:Subject:In-Reply-To:Reply-To:List-ID:From; b=XjXPhjotK3mOqV5ujTFnT76XdoWE6FoUyB3DBYiIX3yM2xioc7olQty2hTuwxzTZ5 kyN1AFgltJ+nCj6VEo7HjErKf+RCepR2pzax3ETTE7Oyu6m/eiMwPdzSD3Adgjawev q5PK6PIAHRmxC9mOIQyx0SlpAcXpqHS3PTG3y1SQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726617AbgGNAYH (ORCPT ); Mon, 13 Jul 2020 20:24:07 -0400 Received: from mail.kernel.org ([198.145.29.99]:43278 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726432AbgGNAYH (ORCPT ); Mon, 13 Jul 2020 20:24:07 -0400 Received: from localhost.localdomain (c-73-231-172-41.hsd1.ca.comcast.net [73.231.172.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id DDEE92186A; Tue, 14 Jul 2020 00:24:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1594686246; bh=GP8Bw1UugpYVhlN8HeHVsurVA65SyC7kNKoM/SSNjAA=; h=Date:From:To:Subject:In-Reply-To:From; b=qum4/1YtmgH1AzLgV3AkNWiTDGqmECbif03xtXyXmKSAgrKmJTTPf/eWPg7+tpGqg 4Xkm8cr27EVr6lZjZKq89/AIk7rto/nAR5iNvL0CyQULuPei4v1weikW0jkJvcoEo8 erVjdoUrNspiIuLv7AwmQY7GUMVe8NArOOsZC30s= Date: Mon, 13 Jul 2020 17:24:05 -0700 From: Andrew Morton To: akpm@linux-foundation.org, jhubbard@nvidia.com, kirill@shutemov.name, mm-commits@vger.kernel.org, rppt@linux.ibm.com, vbabka@suse.cz, william.kucharski@oracle.com, willy@infradead.org Subject: + mm-handle-page-mapping-better-in-dump_page-fix.patch added to -mm tree Message-ID: <20200714002405.MedMjztc1%akpm@linux-foundation.org> In-Reply-To: <20200703151445.b6a0cfee402c7c5c4651f1b1@linux-foundation.org> User-Agent: s-nail v14.8.16 Sender: mm-commits-owner@vger.kernel.org Precedence: bulk Reply-To: linux-kernel@vger.kernel.org List-ID: X-Mailing-List: mm-commits@vger.kernel.org The patch titled Subject: mm-handle-page-mapping-better-in-dump_page-fix has been added to the -mm tree. Its filename is mm-handle-page-mapping-better-in-dump_page-fix.patch This patch should soon appear at http://ozlabs.org/~akpm/mmots/broken-out/mm-handle-page-mapping-better-in-dump_page-fix.patch and later at http://ozlabs.org/~akpm/mmotm/broken-out/mm-handle-page-mapping-better-in-dump_page-fix.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next and is updated there every 3-4 working days ------------------------------------------------------ From: Andrew Morton Subject: mm-handle-page-mapping-better-in-dump_page-fix augmented code comment from John Link: http://lkml.kernel.org/r/15cff11a-6762-8a6a-3f0e-dd227280cd6f@nvidia.com Cc: John Hubbard Cc: "Kirill A. Shutemov" Cc: "Matthew Wilcox (Oracle)" Cc: Mike Rapoport Cc: Vlastimil Babka Cc: William Kucharski Signed-off-by: Andrew Morton --- mm/debug.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) --- a/mm/debug.c~mm-handle-page-mapping-better-in-dump_page-fix +++ a/mm/debug.c @@ -69,7 +69,13 @@ void __dump_page(struct page *page, cons } if (page < head || (page >= head + MAX_ORDER_NR_PAGES)) { - /* Corrupt page, cannot call page_mapping */ + /* + * Corrupt page, so we cannot call page_mapping. Instead, do a + * safe subset of the steps that page_mapping() does. Caution: + * this will be misleading for tail pages, PageSwapCache pages, + * and potentially other situations. (See the page_mapping() + * implementation for what's missing here.) + */ unsigned long tmp = (unsigned long)page->mapping; if (tmp & PAGE_MAPPING_ANON) _ Patches currently in -mm which might be from akpm@linux-foundation.org are mm-close-race-between-munmap-and-expand_upwards-downwards-fix.patch mm.patch mm-handle-page-mapping-better-in-dump_page-fix.patch mm-memcg-percpu-account-percpu-memory-to-memory-cgroups-fix.patch mm-memcg-percpu-account-percpu-memory-to-memory-cgroups-fix-fix.patch mm-vmstat-add-events-for-thp-migration-without-split-fix.patch linux-next-rejects.patch mm-madvise-introduce-process_madvise-syscall-an-external-memory-hinting-api-fix.patch mm-madvise-introduce-process_madvise-syscall-an-external-memory-hinting-api-fix-2.patch kernel-forkc-export-kernel_thread-to-modules.patch