From patchwork Tue Mar 10 12:38:56 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 229773 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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, 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 DE053C10F27 for ; Tue, 10 Mar 2020 12:45:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AAC2F24691 for ; Tue, 10 Mar 2020 12:45:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1583844347; bh=tga0kAfL5khGIFnbNDBvYt+Mr60/b3AfqOf26I9Xtjo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=DKFvsZAV4jKStPYb08lIoN2LN4NtHLYN+6VmTSInvDmeMfMc5rYXEKRyxzPRns11v 3Hvypx5shUX6L0/Zo9pUn5LNnQ724gWhzyFTkhyUJjrQjemFiccUL1WfQmj9nQuRbp tUHhwhPPHOc0kE1SCWpeKdEdz27Eno5I/xsnfq3c= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726980AbgCJMpr (ORCPT ); Tue, 10 Mar 2020 08:45:47 -0400 Received: from mail.kernel.org ([198.145.29.99]:48550 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726861AbgCJMpq (ORCPT ); Tue, 10 Mar 2020 08:45:46 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (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 884BA2469C; Tue, 10 Mar 2020 12:45:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1583844346; bh=tga0kAfL5khGIFnbNDBvYt+Mr60/b3AfqOf26I9Xtjo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KLT9z/AWgz5hsakzWrKLje01wxKTPyz3lKy3zgfXvRhldDM8PUupZvtQPc1JUYB3i yA5Ws8FKSQUliylKRVEAP0JptAdV2/oxq2fXoH9c+bNyLPipd6lJi9eRursH5DvAwm ZEyXqJrmboePQqzhG5j2+rxyfVEfPLe6y+D0w14U= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Wei Yang , "Kirill A. Shutemov" , Andrew Morton , Linus Torvalds Subject: [PATCH 4.9 48/88] mm/huge_memory.c: use head to check huge zero page Date: Tue, 10 Mar 2020 13:38:56 +0100 Message-Id: <20200310123617.993328962@linuxfoundation.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200310123606.543939933@linuxfoundation.org> References: <20200310123606.543939933@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Wei Yang commit cb829624867b5ab10bc6a7036d183b1b82bfe9f8 upstream. The page could be a tail page, if this is the case, this BUG_ON will never be triggered. Link: http://lkml.kernel.org/r/20200110032610.26499-1-richardw.yang@linux.intel.com Fixes: e9b61f19858a ("thp: reintroduce split_huge_page()") Signed-off-by: Wei Yang Acked-by: Kirill A. Shutemov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman --- mm/huge_memory.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -2095,7 +2095,7 @@ int split_huge_page_to_list(struct page unsigned long flags; pgoff_t end; - VM_BUG_ON_PAGE(is_huge_zero_page(page), page); + VM_BUG_ON_PAGE(is_huge_zero_page(head), head); VM_BUG_ON_PAGE(!PageLocked(page), page); VM_BUG_ON_PAGE(!PageSwapBacked(page), page); VM_BUG_ON_PAGE(!PageCompound(page), page);