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=-9.5 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 CD5E2C433E1 for ; Thu, 9 Jul 2020 20:21:27 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 8A5DF20720 for ; Thu, 9 Jul 2020 20:21:27 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="TaN39L/R" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8A5DF20720 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 0BF5B6B0005; Thu, 9 Jul 2020 16:21:26 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 01FFE6B0006; Thu, 9 Jul 2020 16:21:25 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id E29EF6B0007; Thu, 9 Jul 2020 16:21:25 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0013.hostedemail.com [216.40.44.13]) by kanga.kvack.org (Postfix) with ESMTP id CA0696B0005 for ; Thu, 9 Jul 2020 16:21:25 -0400 (EDT) Received: from smtpin14.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 70000181AEF10 for ; Thu, 9 Jul 2020 20:21:25 +0000 (UTC) X-FDA: 77019657330.14.crib53_5607c7426ec8 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin14.hostedemail.com (Postfix) with ESMTP id 4703D18229837 for ; Thu, 9 Jul 2020 20:21:25 +0000 (UTC) X-HE-Tag: crib53_5607c7426ec8 X-Filterd-Recvd-Size: 2593 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf20.hostedemail.com (Postfix) with ESMTP for ; Thu, 9 Jul 2020 20:21:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=A8WxAeQRFQgIloG6cjUT6pIJ/eBvphQj1XmdYeRhLwM=; b=TaN39L/RQb9S0uR6TAGdDMdhFj rtCe4EthjWInFdTi4RfMdFs+KIPXf+wyuZREe5PlY3Lm0mx+hhO0+I22G1Jb9RXt4/vhvsff0azFr A9anMidSKJEE2KNFixi6zMH0UF8Ei36P01ocqC+BVF9xuew32RWyTQFP6tX3ScK+QUiHVkGTHc/Qk 5OdMZbmn10Ecx8d3HWJMZXPSaHfYKYku/jGUqhBUw0K5IipUpVfbWIqmUtN5UP2sGai6mFg+SAgz7 Rfv1ikLGdhFpotfH3abynyrANukm2Ec2kd9URhU9Y3E0svy4q2CiLMpZmwt6cdI7ldPgZJS3PI76+ B00e/WWQ==; Received: from willy by casper.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1jtd2m-0001tc-QT; Thu, 09 Jul 2020 20:21:20 +0000 From: "Matthew Wilcox (Oracle)" To: linux-mm@kvack.org Cc: "Matthew Wilcox (Oracle)" , Andrew Morton , Vlastimil Babka , John Hubbard , "Kirill A. Shutemov" , William Kucharski , Mike Rapoport Subject: [PATCH v2 1/6] mm: Handle page->mapping better in dump_page Date: Thu, 9 Jul 2020 21:21:12 +0100 Message-Id: <20200709202117.7216-2-willy@infradead.org> X-Mailer: git-send-email 2.21.3 In-Reply-To: <20200709202117.7216-1-willy@infradead.org> References: <20200709202117.7216-1-willy@infradead.org> MIME-Version: 1.0 X-Rspamd-Queue-Id: 4703D18229837 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam02 Content-Transfer-Encoding: quoted-printable 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: If we can't call page_mapping() to get the page mapping, handle the anon/ksm/movable bits correctly. Signed-off-by: Matthew Wilcox (Oracle) --- mm/debug.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/mm/debug.c b/mm/debug.c index 4f376514744d..e5de63406b59 100644 --- a/mm/debug.c +++ b/mm/debug.c @@ -70,7 +70,12 @@ void __dump_page(struct page *page, const char *reason= ) =20 if (page < head || (page >=3D head + MAX_ORDER_NR_PAGES)) { /* Corrupt page, cannot call page_mapping */ - mapping =3D page->mapping; + unsigned long tmp =3D (unsigned long)page->mapping; + + if (tmp & PAGE_MAPPING_ANON) + mapping =3D NULL; + else + mapping =3D (void *)(tmp & ~PAGE_MAPPING_FLAGS); head =3D page; compound =3D false; } else { --=20 2.27.0