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 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,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 46570C47082 for ; Sat, 5 Jun 2021 07:53:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2D3506135D for ; Sat, 5 Jun 2021 07:53:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230083AbhFEHyT (ORCPT ); Sat, 5 Jun 2021 03:54:19 -0400 Received: from szxga08-in.huawei.com ([45.249.212.255]:4317 "EHLO szxga08-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229929AbhFEHyR (ORCPT ); Sat, 5 Jun 2021 03:54:17 -0400 Received: from dggeme703-chm.china.huawei.com (unknown [172.30.72.57]) by szxga08-in.huawei.com (SkyGuard) with ESMTP id 4FxsDY6ZV8z1BGkY; Sat, 5 Jun 2021 15:47:41 +0800 (CST) Received: from huawei.com (10.175.104.170) by dggeme703-chm.china.huawei.com (10.1.199.99) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2176.2; Sat, 5 Jun 2021 15:52:28 +0800 From: Miaohe Lin To: , , CC: , , Subject: [PATCH 1/2] mm/zbud: reuse unbuddied[0] as buddied in zbud_pool Date: Sat, 5 Jun 2021 15:51:40 +0800 Message-ID: <20210605075141.1359969-2-linmiaohe@huawei.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20210605075141.1359969-1-linmiaohe@huawei.com> References: <20210605075141.1359969-1-linmiaohe@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7BIT Content-Type: text/plain; charset=US-ASCII X-Originating-IP: [10.175.104.170] X-ClientProxiedBy: dggems704-chm.china.huawei.com (10.3.19.181) To dggeme703-chm.china.huawei.com (10.1.199.99) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Since commit 9d8c5b5284e4 ("mm: zbud: fix condition check on allocation size"), zbud_pool.unbuddied[0] is always unused. We can reuse it as buddied field to save some possible memory. Signed-off-by: Miaohe Lin --- mm/zbud.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/zbud.c b/mm/zbud.c index a200121da400..91543be47e3d 100644 --- a/mm/zbud.c +++ b/mm/zbud.c @@ -96,7 +96,7 @@ struct zbud_pool { spinlock_t lock; struct list_head unbuddied[NCHUNKS]; - struct list_head buddied; +#define buddied unbuddied[0] struct list_head lru; u64 pages_nr; const struct zbud_ops *ops; -- 2.23.0