From patchwork Thu Aug 20 14:30:24 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Leizhen (ThunderTown)" X-Patchwork-Id: 11726369 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 292F214F6 for ; Thu, 20 Aug 2020 14:30:58 +0000 (UTC) Received: from ml01.01.org (ml01.01.org [198.145.21.10]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 11FC72078D for ; Thu, 20 Aug 2020 14:30:58 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 11FC72078D Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=huawei.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-nvdimm-bounces@lists.01.org Received: from ml01.vlan13.01.org (localhost [IPv6:::1]) by ml01.01.org (Postfix) with ESMTP id C0515134A64A1; Thu, 20 Aug 2020 07:30:57 -0700 (PDT) Received-SPF: Pass (mailfrom) identity=mailfrom; client-ip=45.249.212.35; helo=huawei.com; envelope-from=thunder.leizhen@huawei.com; receiver= Received: from huawei.com (szxga07-in.huawei.com [45.249.212.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id 50489134A649A for ; Thu, 20 Aug 2020 07:30:55 -0700 (PDT) Received: from DGGEMS411-HUB.china.huawei.com (unknown [172.30.72.58]) by Forcepoint Email with ESMTP id CD1104045911F351B0E0; Thu, 20 Aug 2020 22:30:51 +0800 (CST) Received: from DESKTOP-C3MD9UG.china.huawei.com (10.174.177.253) by DGGEMS411-HUB.china.huawei.com (10.3.19.211) with Microsoft SMTP Server id 14.3.487.0; Thu, 20 Aug 2020 22:30:41 +0800 From: Zhen Lei To: Oliver O'Halloran , Dan Williams , Vishal Verma , "Dave Jiang" , Ira Weiny , linux-nvdimm , linux-kernel Subject: [PATCH 1/4] libnvdimm: remove redundant list_empty() check in badrange.c Date: Thu, 20 Aug 2020 22:30:24 +0800 Message-ID: <20200820143027.3241-2-thunder.leizhen@huawei.com> X-Mailer: git-send-email 2.26.0.windows.1 In-Reply-To: <20200820143027.3241-1-thunder.leizhen@huawei.com> References: <20200820143027.3241-1-thunder.leizhen@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.174.177.253] X-CFilter-Loop: Reflected Message-ID-Hash: WYRGLBRIFVTROJNTDQUGA2JKGUN4AQTE X-Message-ID-Hash: WYRGLBRIFVTROJNTDQUGA2JKGUN4AQTE X-MailFrom: thunder.leizhen@huawei.com X-Mailman-Rule-Hits: nonmember-moderation X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation CC: Zhen Lei X-Mailman-Version: 3.1.1 Precedence: list List-Id: "Linux-nvdimm developer list." Archived-At: List-Archive: List-Help: List-Post: List-Subscribe: List-Unsubscribe: In add_badrange() or badblocks_populate(), the list_empty() branch does the same things as the code after list_for_each_entry(). And the list_for_each_entry() will do noting when list_empty(). So the list_empty() branch can be removed without functional change, let the code after list_for_each_entry() to do it. Signed-off-by: Zhen Lei --- drivers/nvdimm/badrange.c | 10 ---------- 1 file changed, 10 deletions(-) diff --git a/drivers/nvdimm/badrange.c b/drivers/nvdimm/badrange.c index b9eeefa27e3a507..9fdba8c43e8605e 100644 --- a/drivers/nvdimm/badrange.c +++ b/drivers/nvdimm/badrange.c @@ -53,13 +53,6 @@ static int add_badrange(struct badrange *badrange, u64 addr, u64 length) bre_new = kzalloc(sizeof(*bre_new), GFP_KERNEL); spin_lock(&badrange->lock); - if (list_empty(&badrange->list)) { - if (!bre_new) - return -ENOMEM; - append_badrange_entry(badrange, bre_new, addr, length); - return 0; - } - /* * There is a chance this is a duplicate, check for those first. * This will be the common case as ARS_STATUS returns all known @@ -215,9 +208,6 @@ static void badblocks_populate(struct badrange *badrange, { struct badrange_entry *bre; - if (list_empty(&badrange->list)) - return; - list_for_each_entry(bre, &badrange->list, list) { u64 bre_end = bre->start + bre->length - 1;