From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f177.google.com (mail-pl1-f177.google.com [209.85.214.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 04DC62ECD1D for ; Tue, 16 Sep 2025 04:49:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.177 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757998177; cv=none; b=ne73H++2jBvzklOa+yd+2ufiYjo9vZ1Q4CR/4UmRLyr1r1AvKSOPBmjRIcncN6X5TxE6+QDOOvA0Hpob+lxQ2vlnVs7hcpYTk7rr0V/k7t6TOD/AmOXYkU3jrqOiM+2Izcg8MgPY3cv8t7FIMAncNBBjcnbvM+GuMQDsM+6hB2A= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757998177; c=relaxed/simple; bh=dy9spvLipBJ0oxpRy6D3U8JeqM1cA+2DUbEARoiEIho=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=rXd9KQ6yVxNQPOZs9OBHXISEemHeFpgK5W4Ka8MM4CAIL+lW9r/eatNds5Uv1M7LwpU1DsiNLxcvTzRSv0CZsyKNYLV1QOPI8zdh/xNCsK9nKPypzDcY9Jhct3M5FTU9sGR6XnZaAENFtscOZZ6MOTFpRFxg1Is8hff7HJVhLww= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=WEJwboRo; arc=none smtp.client-ip=209.85.214.177 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="WEJwboRo" Received: by mail-pl1-f177.google.com with SMTP id d9443c01a7336-261682fdfceso22360475ad.1 for ; Mon, 15 Sep 2025 21:49:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1757998174; x=1758602974; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=kee/jWM05xMj5MjToYK8a9EUY/mguZ7xPQQnB3cJ53E=; b=WEJwboRoA+7Q/dtbpjLY1iSOzyDv2c7nLD5tzESh/xoo13VNtR/TuEemvpBow5vvEn H7ry4eNsUi4IQV8DjKDpbV4r0L5NEiNdbzxgZ9uF1g6TLnrD4vmU5xiiUDdvRUp82yHX 5XmgyQKs33tjnmDUjMrqxpFjpFB6RPqKiIYNPBfImWxQHKjvIJQIuhSjg3OwcMtI6Sfo i4HnREvhWsFyA7lO140ZMwL9JUpp5QX2ZSunJSuv006RmJnQTtQVVYSSc8waQPaTuRg6 2dO06Xyt+iuxUmp3SRacsW6eS/lXTsOf7kwLF/UWzELlusoGLpEM/leXstF1sKj4podi n90w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1757998174; x=1758602974; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=kee/jWM05xMj5MjToYK8a9EUY/mguZ7xPQQnB3cJ53E=; b=Nu9XPptxqoISpJfOS0VEmZ0rXcSrlYZUGEEGF12JRIvGrnnc9PIibq5JGcuG3jYnD6 OnROFTCWHJkdkJ5StppDEEoZn5k+y1CHoBFoNlfFi0mjuIHDHh+Uueyr8yKKXK22jt8a b1zYi18rvtPdn+MOTrklVNr05byKFLbzFNlS6/dCKpuO5bdDx96JshRn0/wGeLHw/i5t 0OmTlt4Qzn0QoIHDQgB79miuZ3j1Ubwc7fgIc19MMfX8gdAPa/CKTIusP5PZ737PPGn2 fy4FsVlZYvdq2TG6bdqsrkTYOOrjfjkeOsfl2nkDDWYGFdBeJEPkIj454hQXHoLcIsHG 706g== X-Forwarded-Encrypted: i=1; AJvYcCVYEg/P+bq34YgTHl8eDQ7fkL+uHOfDswOkEqTjTj5m62bXuYVpDDy2/KAM1Tu2lPR+h3ezb4Tnygjge5sE@vger.kernel.org X-Gm-Message-State: AOJu0Yzg6rgWaBe4/iWexRPmr16EYmm3s7R+g8q0YaGdsu40d5WwVTdU 09zDpFbqDL03tmoKdBJopRzPxI25ZBO45lCA5qhewQT5+Vq+nxk5CICd X-Gm-Gg: ASbGncueJ8pvBKwUiDoED7045xYV5KB1D/hJp5NMX6sOvXiCjvPzyBOjFaX7U1RtqOm DAcpZ2sDlTz/Q2ahKgTNcS1FY7tlvWwyWyIRcxBRbm5CWZL41wIbQYEGSxY3UXyXwzyOCglC5aG b/724beouhdRKCBKxt7RN5Y/AF/TTmq56tbcmAJtYr0JgTduVBF/Ila11mlUyfRjFTb61fdN7NQ gdnEeZ3VvCjsMASNh6BuGMZesVvhf7ViL/NS9vbNRNfhdKW5p33n8IXJicEsYk5VPNgEZqS1DkA EgZXtyVyPq1ufHMDF5q8yPSG0V5K2wjnhCfCPIvObQO44jj4Q7MEV6Cr9HqsKiSNaNVktJ0TlsY JOqJVbs0bRvrJunjhq0jeC2jiZ0ZnV7q8S/Bs4xc= X-Google-Smtp-Source: AGHT+IHQsp/jp2h5qh/u2y0fwJLYw3kUJFgybrRxf3n883LnUrw88kxlxQMidQOFwo4KtZaOVgbKQg== X-Received: by 2002:a17:902:cecc:b0:267:a1d5:7372 with SMTP id d9443c01a7336-267d151fba1mr14211985ad.4.1757998173983; Mon, 15 Sep 2025 21:49:33 -0700 (PDT) Received: from pengdl-pc.mioffice.cn ([43.224.245.249]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-25ef09c77f8sm104600605ad.15.2025.09.15.21.49.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 15 Sep 2025 21:49:33 -0700 (PDT) From: pengdonglin To: tj@kernel.org, tony.luck@intel.com, jani.nikula@linux.intel.com, ap420073@gmail.com, jv@jvosburgh.net, freude@linux.ibm.com, bcrl@kvack.org, trondmy@kernel.org, longman@redhat.com, kees@kernel.org Cc: bigeasy@linutronix.de, hdanton@sina.com, paulmck@kernel.org, linux-kernel@vger.kernel.org, linux-rt-devel@lists.linux.dev, linux-nfs@vger.kernel.org, linux-aio@kvack.org, linux-fsdevel@vger.kernel.org, linux-security-module@vger.kernel.org, netdev@vger.kernel.org, intel-gfx@lists.freedesktop.org, linux-wireless@vger.kernel.org, linux-acpi@vger.kernel.org, linux-s390@vger.kernel.org, cgroups@vger.kernel.org, pengdonglin , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , pengdonglin Subject: [PATCH v3 12/14] net: amt: Remove redundant rcu_read_lock/unlock() in spin_lock Date: Tue, 16 Sep 2025 12:47:33 +0800 Message-Id: <20250916044735.2316171-13-dolinux.peng@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250916044735.2316171-1-dolinux.peng@gmail.com> References: <20250916044735.2316171-1-dolinux.peng@gmail.com> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: pengdonglin Since commit a8bb74acd8efe ("rcu: Consolidate RCU-sched update-side function definitions") there is no difference between rcu_read_lock(), rcu_read_lock_bh() and rcu_read_lock_sched() in terms of RCU read section and the relevant grace period. That means that spin_lock(), which implies rcu_read_lock_sched(), also implies rcu_read_lock(). There is no need no explicitly start a RCU read section if one has already been started implicitly by spin_lock(). Simplify the code and remove the inner rcu_read_lock() invocation. Cc: Taehee Yoo Cc: Andrew Lunn Cc: "David S. Miller" Cc: Eric Dumazet Cc: Jakub Kicinski Signed-off-by: pengdonglin Signed-off-by: pengdonglin --- drivers/net/amt.c | 8 -------- 1 file changed, 8 deletions(-) diff --git a/drivers/net/amt.c b/drivers/net/amt.c index ed86537b2f61..aaed9fbc7526 100644 --- a/drivers/net/amt.c +++ b/drivers/net/amt.c @@ -295,7 +295,6 @@ static void amt_source_work(struct work_struct *work) tunnel = gnode->tunnel_list; spin_lock_bh(&tunnel->lock); - rcu_read_lock(); if (gnode->filter_mode == MCAST_INCLUDE) { amt_destroy_source(snode); if (!gnode->nr_sources) @@ -306,7 +305,6 @@ static void amt_source_work(struct work_struct *work) */ snode->status = AMT_SOURCE_STATUS_D_FWD; } - rcu_read_unlock(); spin_unlock_bh(&tunnel->lock); } @@ -426,7 +424,6 @@ static void amt_group_work(struct work_struct *work) goto out; } - rcu_read_lock(); for (i = 0; i < buckets; i++) { hlist_for_each_entry_safe(snode, t, &gnode->sources[i], node) { @@ -443,7 +440,6 @@ static void amt_group_work(struct work_struct *work) amt_del_group(amt, gnode); else gnode->filter_mode = MCAST_INCLUDE; - rcu_read_unlock(); spin_unlock_bh(&tunnel->lock); out: dev_put(amt->dev); @@ -1327,11 +1323,9 @@ static void amt_clear_groups(struct amt_tunnel_list *tunnel) int i; spin_lock_bh(&tunnel->lock); - rcu_read_lock(); for (i = 0; i < amt->hash_buckets; i++) hlist_for_each_entry_safe(gnode, t, &tunnel->groups[i], node) amt_del_group(amt, gnode); - rcu_read_unlock(); spin_unlock_bh(&tunnel->lock); } @@ -1343,11 +1337,9 @@ static void amt_tunnel_expire(struct work_struct *work) struct amt_dev *amt = tunnel->amt; spin_lock_bh(&amt->lock); - rcu_read_lock(); list_del_rcu(&tunnel->list); amt->nr_tunnels--; amt_clear_groups(tunnel); - rcu_read_unlock(); spin_unlock_bh(&amt->lock); kfree_rcu(tunnel, rcu); } -- 2.34.1