From patchwork Thu Mar 18 12:27:20 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Miaohe Lin X-Patchwork-Id: 12148075 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=-16.8 required=3.0 tests=BAYES_00, 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 9443DC433E6 for ; Thu, 18 Mar 2021 12:28:12 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id F23B364F53 for ; Thu, 18 Mar 2021 12:28:11 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org F23B364F53 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=huawei.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 767596B0073; Thu, 18 Mar 2021 08:28:10 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 6C59A6B007D; Thu, 18 Mar 2021 08:28:10 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 54F856B0073; Thu, 18 Mar 2021 08:28:10 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0185.hostedemail.com [216.40.44.185]) by kanga.kvack.org (Postfix) with ESMTP id 343DD6B0073 for ; Thu, 18 Mar 2021 08:28:10 -0400 (EDT) Received: from smtpin17.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id DA76A8249980 for ; Thu, 18 Mar 2021 12:28:09 +0000 (UTC) X-FDA: 77932922298.17.FB01F09 Received: from szxga05-in.huawei.com (szxga05-in.huawei.com [45.249.212.191]) by imf13.hostedemail.com (Postfix) with ESMTP id 226C2E0011ED for ; Thu, 18 Mar 2021 12:28:08 +0000 (UTC) Received: from DGGEMS406-HUB.china.huawei.com (unknown [172.30.72.58]) by szxga05-in.huawei.com (SkyGuard) with ESMTP id 4F1R8M4759zrYPh; Thu, 18 Mar 2021 20:26:11 +0800 (CST) Received: from huawei.com (10.175.104.175) by DGGEMS406-HUB.china.huawei.com (10.3.19.206) with Microsoft SMTP Server id 14.3.498.0; Thu, 18 Mar 2021 20:27:58 +0800 From: Miaohe Lin To: CC: , , , , , , , , , , , , , , Subject: [PATCH v3 4/6] mm/huge_memory.c: remove redundant PageCompound() check Date: Thu, 18 Mar 2021 08:27:20 -0400 Message-ID: <20210318122722.13135-5-linmiaohe@huawei.com> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20210318122722.13135-1-linmiaohe@huawei.com> References: <20210318122722.13135-1-linmiaohe@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.104.175] X-CFilter-Loop: Reflected X-Stat-Signature: wtai5gdoht7u6zatzrrzxrj4homwrj16 X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 226C2E0011ED Received-SPF: none (huawei.com>: No applicable sender policy available) receiver=imf13; identity=mailfrom; envelope-from=""; helo=szxga05-in.huawei.com; client-ip=45.249.212.191 X-HE-DKIM-Result: none/none X-HE-Tag: 1616070488-46385 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: The !PageCompound() check limits the page must be head or tail while !PageHead() further limits it to page head only. So !PageHead() check is equivalent here. Signed-off-by: Miaohe Lin --- mm/huge_memory.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 23964adf5db2..52acc3954afd 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1291,7 +1291,7 @@ vm_fault_t do_huge_pmd_wp_page(struct vm_fault *vmf, pmd_t orig_pmd) } page = pmd_page(orig_pmd); - VM_BUG_ON_PAGE(!PageCompound(page) || !PageHead(page), page); + VM_BUG_ON_PAGE(!PageHead(page), page); /* Lock page for reuse_swap_page() */ if (!trylock_page(page)) {