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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B2019C433F5 for ; Mon, 25 Apr 2022 13:27:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242001AbiDYNa3 (ORCPT ); Mon, 25 Apr 2022 09:30:29 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40728 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233775AbiDYNaK (ORCPT ); Mon, 25 Apr 2022 09:30:10 -0400 Received: from szxga01-in.huawei.com (szxga01-in.huawei.com [45.249.212.187]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C011340918 for ; Mon, 25 Apr 2022 06:27:02 -0700 (PDT) Received: from canpemm500002.china.huawei.com (unknown [172.30.72.55]) by szxga01-in.huawei.com (SkyGuard) with ESMTP id 4Kn5PX74BCzfb4V; Mon, 25 Apr 2022 21:26:08 +0800 (CST) Received: from huawei.com (10.175.124.27) by canpemm500002.china.huawei.com (7.192.104.244) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Mon, 25 Apr 2022 21:27:00 +0800 From: Miaohe Lin To: , , CC: , , , , , , , Subject: [PATCH v2 2/4] mm/migration: remove unneeded lock page and PageMovable check Date: Mon, 25 Apr 2022 21:27:21 +0800 Message-ID: <20220425132723.34824-3-linmiaohe@huawei.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20220425132723.34824-1-linmiaohe@huawei.com> References: <20220425132723.34824-1-linmiaohe@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7BIT Content-Type: text/plain; charset=US-ASCII X-Originating-IP: [10.175.124.27] X-ClientProxiedBy: dggems701-chm.china.huawei.com (10.3.19.178) To canpemm500002.china.huawei.com (7.192.104.244) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org When non-lru movable page was freed from under us, __ClearPageMovable must have been done. Even if it's not done, ClearPageIsolated here won't hurt as page will be freed anyway. So we can thus remove unneeded lock page and PageMovable check here. Signed-off-by: Miaohe Lin Reviewed-by: Christoph Hellwig --- mm/migrate.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-) diff --git a/mm/migrate.c b/mm/migrate.c index b779646665fe..0fc4651b3e39 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -1093,12 +1093,8 @@ static int unmap_and_move(new_page_t get_new_page, /* page was freed from under us. So we are done. */ ClearPageActive(page); ClearPageUnevictable(page); - if (unlikely(__PageMovable(page))) { - lock_page(page); - if (!PageMovable(page)) - ClearPageIsolated(page); - unlock_page(page); - } + if (unlikely(__PageMovable(page))) + ClearPageIsolated(page); goto out; } -- 2.23.0