From nobody Thu Sep 11 21:04:48 2025 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 D4A37C001B0 for ; Tue, 8 Aug 2023 17:43:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234754AbjHHRnI (ORCPT ); Tue, 8 Aug 2023 13:43:08 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56034 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234790AbjHHRmn (ORCPT ); Tue, 8 Aug 2023 13:42:43 -0400 Received: from mail-pf1-x434.google.com (mail-pf1-x434.google.com [IPv6:2607:f8b0:4864:20::434]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D52EA5A79 for ; Tue, 8 Aug 2023 09:18:55 -0700 (PDT) Received: by mail-pf1-x434.google.com with SMTP id d2e1a72fcca58-686e0213c0bso4220978b3a.1 for ; Tue, 08 Aug 2023 09:18:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1691511503; x=1692116303; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=rt72qNtSF7rZ1Cnz4oyWX+TnZhjCs3AGVCD5IGIHOTA=; b=HlF7u+TRRAOC6ZOWCQEEbcAOgq79OjyJkxB1uvXTHsYI/9A8i4QoyE6NCLiGsEdY3N ZMf66NSg9L8WqVihdMR7eMyhdOcC+QStjcCA2L+qtM1S4VBvmreGbTwPvedze5IYDoC7 19Iz9d1PsUu/sMUel6urdTW+nDioEQZNTU8nX10t/saywn4w/umcqCL/uXMhWYuSpz7J H+d7t+j+udD3OKFhtr2MSZHbwEIkjm6Q7A9T/nUmfE6PccINb5Jmb3W5JktjgzFqv18j EfhprPNOxO2+XvO/bacpg2IrzXqWiOBDcgTpS4mel58dlu6aLKaw6XRWWKAfszEpF7rn S3bg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1691511503; x=1692116303; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=rt72qNtSF7rZ1Cnz4oyWX+TnZhjCs3AGVCD5IGIHOTA=; b=YPNHcw6cT/fA/GrUC3cj2EJTu4KrBE5Mt6XLeGT9gJtwkCkp3KhN9LmxLbUMjJZhnu 56Px60Wrq2IkBwyiZf+OyG+ApSJXvpUFssc7EvM6WqtByyb+7o7oOFjcJyg6cXVXJ5xn IANxAPxzW63sdqnZ/spVg789m5x/Vs1rtuk6HK1HNESnTCirMb/hCkrTbGUI+7i4x+pC RbbICOngyNT7InmYI9+MAxx6ClqVPr+M4yXCWQIotu8fA5OBB1sutBm03EtTvJ3y0FR8 9uJ/EQ0IutcUPnhCDC8Bsq8KdN6cgqnXFIqfsyWihK3hu5BYCc4vlLtf0qPkNU3+Xaq4 gv/Q== X-Gm-Message-State: AOJu0YyRFW+w+zdKtUjYag9L5yxHqu5Mr40uaD/r2Vr944gugZaueWEI gnpow1r4/dBaok926vl3FCVzJOn8ZUxMLA== X-Google-Smtp-Source: AGHT+IH8FrLarnBGrUuMl9KPJWo0+EVTzGmY8X5Xyia/GEJJ00nKOVDXm0Jc9HGRXYJPMCd95h2HmA== X-Received: by 2002:a17:902:d48a:b0:1b8:9b17:f63d with SMTP id c10-20020a170902d48a00b001b89b17f63dmr11341555plg.23.1691484395759; Tue, 08 Aug 2023 01:46:35 -0700 (PDT) Received: from localhost.localdomain ([43.132.141.9]) by smtp.gmail.com with ESMTPSA id kb14-20020a170903338e00b001bbbc655ca1sm8383487plb.219.2023.08.08.01.46.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 08 Aug 2023 01:46:35 -0700 (PDT) From: alexjlzheng@gmail.com X-Google-Original-From: alexjlzheng@tencent.com To: akpm@linux-foundation.org Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Jinliang Zheng Subject: [PATCH] writeback: remove redundant checks for root memcg Date: Tue, 8 Aug 2023 16:44:32 +0800 Message-Id: <20230808084431.1632934-1-alexjlzheng@tencent.com> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Jinliang Zheng The check for root memcg will be done in wb_get_lookup(), so remove the redundant one to simplify the code. Signed-off-by: Jinliang Zheng --- mm/backing-dev.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/mm/backing-dev.c b/mm/backing-dev.c index 3ffc3cfa7a14..9076f3ad39de 100644 --- a/mm/backing-dev.c +++ b/mm/backing-dev.c @@ -733,9 +733,6 @@ struct bdi_writeback *wb_get_create(struct backing_dev_= info *bdi, =20 might_alloc(gfp); =20 - if (!memcg_css->parent) - return &bdi->wb; - do { wb =3D wb_get_lookup(bdi, memcg_css); } while (!wb && !cgwb_create(bdi, memcg_css, gfp)); --=20 2.31.1