From patchwork Mon May 17 14:01:52 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 440719 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=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 720B4C43462 for ; Mon, 17 May 2021 15:21:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6876D610CB for ; Mon, 17 May 2021 15:21:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241669AbhEQPXD (ORCPT ); Mon, 17 May 2021 11:23:03 -0400 Received: from mail.kernel.org ([198.145.29.99]:52808 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243584AbhEQPRi (ORCPT ); Mon, 17 May 2021 11:17:38 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id B07836191A; Mon, 17 May 2021 14:33:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1621261996; bh=9tedimjvqebY2/nQf8qfexNUQRBqICQvIL6lPheRT3E=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=kyV8DLMwuVt7BrmaXjO3FkMyyqsgQ7Uy2MZHDrSijWORk41fZyOptfDrNhb6In5s+ RZNzLmP/aE3HDPC1RnfM2iKEqVSL7MtKFOkLQESTkt+U96rwxQbzysuC2LPVYEvWTe x3j9cEu3Lvq/uCG0qxSs4+vyiPPN1GQdre4DZgEk= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Miaohe Lin , "Kirill A. Shutemov" , Dan Carpenter , Ebru Akagunduz , Mike Kravetz , Rik van Riel , Andrew Morton , Linus Torvalds , Sasha Levin Subject: [PATCH 5.11 201/329] khugepaged: fix wrong result value for trace_mm_collapse_huge_page_isolate() Date: Mon, 17 May 2021 16:01:52 +0200 Message-Id: <20210517140308.918899020@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210517140302.043055203@linuxfoundation.org> References: <20210517140302.043055203@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Miaohe Lin [ Upstream commit 74e579bf231a337ab3786d59e64bc94f45ca7b3f ] In writable and !referenced case, the result value should be SCAN_LACK_REFERENCED_PAGE for trace_mm_collapse_huge_page_isolate() instead of default 0 (SCAN_FAIL) here. Link: https://lkml.kernel.org/r/20210306032947.35921-5-linmiaohe@huawei.com Fixes: 7d2eba0557c1 ("mm: add tracepoint for scanning pages") Signed-off-by: Miaohe Lin Acked-by: Kirill A. Shutemov Cc: Dan Carpenter Cc: Ebru Akagunduz Cc: Mike Kravetz Cc: Rik van Riel Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Sasha Levin --- mm/khugepaged.c | 18 +++++++++--------- 1 file changed, 9 insertions(+), 9 deletions(-) diff --git a/mm/khugepaged.c b/mm/khugepaged.c index 494d3cb0b58a..897b91c5f1d2 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -716,17 +716,17 @@ next: if (pte_write(pteval)) writable = true; } - if (likely(writable)) { - if (likely(referenced)) { - result = SCAN_SUCCEED; - trace_mm_collapse_huge_page_isolate(page, none_or_zero, - referenced, writable, result); - return 1; - } - } else { + + if (unlikely(!writable)) { result = SCAN_PAGE_RO; + } else if (unlikely(!referenced)) { + result = SCAN_LACK_REFERENCED_PAGE; + } else { + result = SCAN_SUCCEED; + trace_mm_collapse_huge_page_isolate(page, none_or_zero, + referenced, writable, result); + return 1; } - out: release_pte_pages(pte, _pte, compound_pagelist); trace_mm_collapse_huge_page_isolate(page, none_or_zero,