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=-19.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 2BE17C433B4 for ; Mon, 17 May 2021 14:31:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0C05261874 for ; Mon, 17 May 2021 14:31:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240067AbhEQOdD (ORCPT ); Mon, 17 May 2021 10:33:03 -0400 Received: from mail.kernel.org ([198.145.29.99]:53200 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239173AbhEQO2K (ORCPT ); Mon, 17 May 2021 10:28:10 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 353F361613; Mon, 17 May 2021 14:14:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1621260843; bh=8GpjL861nW8p/QuZ1v4SwYY5mHfItd02U0CdjZFA9i0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RgLR3ePa3hKXDO17KyXoPzPr86sjTEVD8p8JjO/yJyMtTMKcgQH8lKY3Fv66dZuZa /DfQdD2LpfPr/R5LxsdR2ejJKdkzAGjKmVDLXM8im3qpRHsbPww7oGOEgk+SrxDIRz Zjk2AGI5vgLUbKMr2NOemk5gJC+3t62k5WrPmSrE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Miaohe Lin , David Hildenbrand , Alistair Popple , Jerome Glisse , Rafael Aquini , Yang Shi , Andrew Morton , Linus Torvalds , Sasha Levin Subject: [PATCH 5.12 219/363] mm/migrate.c: fix potential indeterminate pte entry in migrate_vma_insert_page() Date: Mon, 17 May 2021 16:01:25 +0200 Message-Id: <20210517140309.996317570@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210517140302.508966430@linuxfoundation.org> References: <20210517140302.508966430@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Miaohe Lin [ Upstream commit 34f5e9b9d1990d286199084efa752530ee3d8297 ] If the zone device page does not belong to un-addressable device memory, the variable entry will be uninitialized and lead to indeterminate pte entry ultimately. Fix this unexpected case and warn about it. Link: https://lkml.kernel.org/r/20210325131524.48181-4-linmiaohe@huawei.com Fixes: df6ad69838fc ("mm/device-public-memory: device memory cache coherent with CPU") Signed-off-by: Miaohe Lin Reviewed-by: David Hildenbrand Cc: Alistair Popple Cc: Jerome Glisse Cc: Rafael Aquini Cc: Yang Shi Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Sasha Levin --- mm/migrate.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/mm/migrate.c b/mm/migrate.c index 62b81d5257aa..773622cffe77 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -2973,6 +2973,13 @@ static void migrate_vma_insert_page(struct migrate_vma *migrate, swp_entry = make_device_private_entry(page, vma->vm_flags & VM_WRITE); entry = swp_entry_to_pte(swp_entry); + } else { + /* + * For now we only support migrating to un-addressable + * device memory. + */ + pr_warn_once("Unsupported ZONE_DEVICE page type.\n"); + goto abort; } } else { entry = mk_pte(page, vma->vm_page_prot); -- 2.30.2