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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B8AE2C07E9D for ; Thu, 29 Sep 2022 07:41:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235451AbiI2Hli (ORCPT ); Thu, 29 Sep 2022 03:41:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52750 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235443AbiI2HlS (ORCPT ); Thu, 29 Sep 2022 03:41:18 -0400 Received: from szxga02-in.huawei.com (szxga02-in.huawei.com [45.249.212.188]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F0975139F64; Thu, 29 Sep 2022 00:41:00 -0700 (PDT) Received: from kwepemi500016.china.huawei.com (unknown [172.30.72.55]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4MdQD31rKyzWh2W; Thu, 29 Sep 2022 15:36:51 +0800 (CST) Received: from huawei.com (10.174.178.129) by kwepemi500016.china.huawei.com (7.221.188.220) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Thu, 29 Sep 2022 15:40:57 +0800 From: Kemeng Shi To: , CC: , , , Subject: [PATCH 1/3] block: Remove redundant parent blkcg_gp check in check_scale_change Date: Thu, 29 Sep 2022 15:40:53 +0800 Message-ID: <20220929074055.30080-2-shikemeng@huawei.com> X-Mailer: git-send-email 2.14.1.windows.1 In-Reply-To: <20220929074055.30080-1-shikemeng@huawei.com> References: <20220929074055.30080-1-shikemeng@huawei.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.174.178.129] X-ClientProxiedBy: dggems701-chm.china.huawei.com (10.3.19.178) To kwepemi500016.china.huawei.com (7.221.188.220) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org Function blkcg_iolatency_throttle will make sure blkg->parent is not NULL before calls check_scale_change. And function check_scale_change is only called in blkcg_iolatency_throttle. Signed-off-by: Kemeng Shi --- block/blk-iolatency.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/block/blk-iolatency.c b/block/blk-iolatency.c index e285152345a2..a8cc5abe91e5 100644 --- a/block/blk-iolatency.c +++ b/block/blk-iolatency.c @@ -403,9 +403,6 @@ static void check_scale_change(struct iolatency_grp *iolat) u64 scale_lat; int direction = 0; - if (lat_to_blkg(iolat)->parent == NULL) - return; - parent = blkg_to_lat(lat_to_blkg(iolat)->parent); if (!parent) return; -- 2.30.0