From patchwork Sat Jun 5 07:51:40 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Miaohe Lin X-Patchwork-Id: 12301263 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 A92EBC47082 for ; Sat, 5 Jun 2021 07:52:45 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 5332E61164 for ; Sat, 5 Jun 2021 07:52:45 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5332E61164 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 ED7DD6B0070; Sat, 5 Jun 2021 03:52:44 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id E628C6B0071; Sat, 5 Jun 2021 03:52:44 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id CDAFB6B0072; Sat, 5 Jun 2021 03:52:44 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0175.hostedemail.com [216.40.44.175]) by kanga.kvack.org (Postfix) with ESMTP id 9CDE16B0070 for ; Sat, 5 Jun 2021 03:52:44 -0400 (EDT) Received: from smtpin25.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 3E3A5180AD804 for ; Sat, 5 Jun 2021 07:52:44 +0000 (UTC) X-FDA: 78218903448.25.CBEF172 Received: from szxga08-in.huawei.com (szxga08-in.huawei.com [45.249.212.255]) by imf03.hostedemail.com (Postfix) with ESMTP id DEDEFC021AC4 for ; Sat, 5 Jun 2021 07:52:41 +0000 (UTC) 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 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 X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: DEDEFC021AC4 X-Stat-Signature: n66eyjwgjy996eok46qm7ko15g9g3myk Authentication-Results: imf03.hostedemail.com; dkim=none; dmarc=pass (policy=none) header.from=huawei.com; spf=pass (imf03.hostedemail.com: domain of linmiaohe@huawei.com designates 45.249.212.255 as permitted sender) smtp.mailfrom=linmiaohe@huawei.com X-HE-Tag: 1622879561-800086 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: 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;