From patchwork Fri Mar 4 09:34:01 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Miaohe Lin X-Patchwork-Id: 12768812 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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id CDEC3C433EF for ; Fri, 4 Mar 2022 09:35:19 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 7E3CF8D000B; Fri, 4 Mar 2022 04:35:08 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 795778D0005; Fri, 4 Mar 2022 04:35:08 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 65B1C8D000B; Fri, 4 Mar 2022 04:35:08 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0209.hostedemail.com [216.40.44.209]) by kanga.kvack.org (Postfix) with ESMTP id 54DC08D0005 for ; Fri, 4 Mar 2022 04:35:08 -0500 (EST) Received: from smtpin21.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 1A45F181C440A for ; Fri, 4 Mar 2022 09:35:08 +0000 (UTC) X-FDA: 79206195096.21.B382CC1 Received: from szxga01-in.huawei.com (szxga01-in.huawei.com [45.249.212.187]) by imf08.hostedemail.com (Postfix) with ESMTP id 679E416000D for ; Fri, 4 Mar 2022 09:35:07 +0000 (UTC) Received: from canpemm500002.china.huawei.com (unknown [172.30.72.56]) by szxga01-in.huawei.com (SkyGuard) with ESMTP id 4K92dV2pXQzbcJP; Fri, 4 Mar 2022 17:30:22 +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 15.1.2308.21; Fri, 4 Mar 2022 17:35:04 +0800 From: Miaohe Lin To: CC: , , , , , , , , , , , , , , , , , , Subject: [PATCH 08/16] mm/migration: avoid unneeded nodemask_t initialization Date: Fri, 4 Mar 2022 17:34:01 +0800 Message-ID: <20220304093409.25829-9-linmiaohe@huawei.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20220304093409.25829-1-linmiaohe@huawei.com> References: <20220304093409.25829-1-linmiaohe@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.124.27] X-ClientProxiedBy: dggems704-chm.china.huawei.com (10.3.19.181) To canpemm500002.china.huawei.com (7.192.104.244) X-CFilter-Loop: Reflected X-Rspam-User: X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 679E416000D X-Stat-Signature: 1q689awz94afbig9mzjhpi55fn5sukth Authentication-Results: imf08.hostedemail.com; dkim=none; dmarc=pass (policy=quarantine) header.from=huawei.com; spf=pass (imf08.hostedemail.com: domain of linmiaohe@huawei.com designates 45.249.212.187 as permitted sender) smtp.mailfrom=linmiaohe@huawei.com X-HE-Tag: 1646386507-637044 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: Avoid unneeded next_pass and this_pass initialization as they're always set before using to save possible cpu cycles when there are plenty of nodes in the system. Signed-off-by: Miaohe Lin Reviewed-by: Muchun Song Reviewed-by: Baolin Wang --- mm/migrate.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/mm/migrate.c b/mm/migrate.c index c84eec19072a..abb0c6715e1f 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -2378,8 +2378,8 @@ static int establish_migrate_target(int node, nodemask_t *used, */ static void __set_migration_target_nodes(void) { - nodemask_t next_pass = NODE_MASK_NONE; - nodemask_t this_pass = NODE_MASK_NONE; + nodemask_t next_pass; + nodemask_t this_pass; nodemask_t used_targets = NODE_MASK_NONE; int node, best_distance;