From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-lj1-f176.google.com (mail-lj1-f176.google.com [209.85.208.176]) (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 C03D825B2E7 for ; Tue, 16 Sep 2025 09:42:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.208.176 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758015728; cv=none; b=t5se8jViRSmwTNN3BWoBXdOZD4t+rl9Me6jzN/rOo6LXwGHwwrRj6QLNsljgwiIr98Z3/mxNdR3P30gRLbZwHWcr6M2Ns63Q41Lv8S4UyLtF0PeYl4sjoQsNarf+zlw6Q937nXtphJpU5YTZ+86gUAgJrp3vKZOznAmYBCybOpM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758015728; c=relaxed/simple; bh=wtSv0L6/GwqZZywYhmXmG694rGZXr5C/8JsbMi/MtQ8=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=Amh+JZSk01eviVpiwum+rIGYQvJjT96NTW/brKRu1HUgwARKUQzlegcaNhg4J2XPTaHGOr+UiuEDytwGcbnoVcVuqH5Ig+/U54ytI6r8CRq7ouHfCoY+XDwhDQUEhEak/DutNBP+7pLw7CeFsmmhcoQlJQuoW1ChKg707b980nc= 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=NROLxOU4; arc=none smtp.client-ip=209.85.208.176 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="NROLxOU4" Received: by mail-lj1-f176.google.com with SMTP id 38308e7fff4ca-336ce4a8bfcso40715331fa.0 for ; Tue, 16 Sep 2025 02:42:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1758015724; x=1758620524; darn=vger.kernel.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=haBjQsvE5vE3ZaF/RXUldLy+CB1Z0cpROeB+NEV/yO0=; b=NROLxOU4z9V4kypeFZVw3XwLvlvgr7633NM1a03un3CtR4lJaMlWQe4MQ9UCfQlvEb 6ob7dt32cZ4IpbAOwNI4qTzia9lGJazUfcNRQp/OvPUSDu7sGMuWeYcpArVUzIW4p20/ gKtwWEXsjbsLeP+PHDVCpBxenDK1C/PGey1OlckTGwKYRad5H3S3uYuXCz0vu8CDIW7T egPW/KGCxW3n6bStOzn36fCBk211k/YGoekXP8VanV1j1gkifMzn/eUrtagsp5xDC43J /jMULwG82ttCurMTfCNleWqTU5QOCkSM5vljU7z/8VsgANXljSZs6vhM5Asl795xTzI1 suEw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1758015724; x=1758620524; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=haBjQsvE5vE3ZaF/RXUldLy+CB1Z0cpROeB+NEV/yO0=; b=nCxJQfSQKHobTnfAkFagyNYuuf2KkcctsIT2be1XwftpLED5sZIMvnQff8k8SCz4NP KJtfPo3JanHZGJpkc17X9EAuN11tORjhXCeTOYbThkFi/7x/FFEwVL+AeqsWE7IDDHQP mQfw2/jZ1nQQVED7aAFN9odsw14ztgYcq6zvXcMrFtSKF1K3Oa6w7AWPwNnXmXNxkCD9 JBVlgIJ3qyThS236YFoEw2ZHo3n1YO5HzZRaBs5RIXKljC922sYcd6xQHjiHj/5w9KT3 jx8meNfh9kmVIJMxdONqE288phV+LwG6Ur9msmwUc3RWI4vhSI33VeyfzGZ3wazVe1W3 t9sQ== X-Forwarded-Encrypted: i=1; AJvYcCXBE8nCAYgXTY5QWdpgBbnwdAzBHUsky5WNkrwn/7Cr2AxxTh6pszCv9rwFufyr7L6ApTtfzquO@vger.kernel.org X-Gm-Message-State: AOJu0YwlBDmQ1UJMO+uLNxc70hB53fQChtsXUSqkPNnQFqSLkM94OWX4 OBaTDpUuftYx3pWGyfY0lvxbt4E/l+TGpMZKmL+I7bPkS6rJbmyB/3FO X-Gm-Gg: ASbGncskMP/McF+7MIrbwNyslpTC7MxEqwlau+KPTenjij1ZAFqwbbFEdHdJ82BQZ8F 6JVpulENIV4vjIcyi9X+g8xkMd5c6CYU1Gw2z3C+xFeiocZnK5U1zuSchyd16/2kgbZwQsZlYOF EFtGjtBWcI7z9cpzEX/JC8nqPNPrrv7ttEQqE0b2J+nefniwKvURNsRuqzCUpvSi0ayyUyceeBh R+cGf1qGomLsHy7gMX4HJL5gRwA4SBpp8FGrTorqTGO4gy/eojUysZbBfqbre1VyW/Q4FybMHxg UpF05xrTmyR8BEB77I0COU5roOHHKKhcbFclH5Y4+JpPW4Dvdwkve23BlBDFBg0GBxEbzYbSBcS BysVRU91eqFrJ908xQ1So9a9v9vgxyqyddmnRM2Qosy00BmQ= X-Google-Smtp-Source: AGHT+IGHsAz1XUgqjX9cBNXDDceT4RSYaRrx53ol9Kht+YGnRRfTcQN5imeqv3DeXohNMYqhdx9Bfg== X-Received: by 2002:a2e:a00e:0:20b0:34a:7575:36db with SMTP id 38308e7fff4ca-351401fd0f5mr48965051fa.33.1758015723646; Tue, 16 Sep 2025 02:42:03 -0700 (PDT) Received: from home.paul.comp (paulfertser.info. [2001:470:26:54b:226:9eff:fe70:80c2]) by smtp.gmail.com with ESMTPSA id 38308e7fff4ca-34f15a5835asm32481881fa.4.2025.09.16.02.42.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 16 Sep 2025 02:42:02 -0700 (PDT) Received: from home.paul.comp (home.paul.comp [IPv6:0:0:0:0:0:0:0:1]) by home.paul.comp (8.15.2/8.15.2/Debian-22+deb11u3) with ESMTP id 58G9fwKw021585; Tue, 16 Sep 2025 12:41:59 +0300 Received: (from paul@localhost) by home.paul.comp (8.15.2/8.15.2/Submit) id 58G9fts1021584; Tue, 16 Sep 2025 12:41:55 +0300 Date: Tue, 16 Sep 2025 12:41:55 +0300 From: Paul Fertser To: pengdonglin Cc: 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, 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, Samuel Mendoza-Jonas , pengdonglin Subject: Re: [PATCH v3 11/14] net: ncsi: Remove redundant rcu_read_lock/unlock() in spin_lock Message-ID: References: <20250916044735.2316171-1-dolinux.peng@gmail.com> <20250916044735.2316171-12-dolinux.peng@gmail.com> Precedence: bulk X-Mailing-List: cgroups@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250916044735.2316171-12-dolinux.peng@gmail.com> Hello pengdonglin, Thank you for the patch, looks reasonable and justified. On Tue, Sep 16, 2025 at 12:47:32PM +0800, pengdonglin wrote: > 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. Reviewed-by: Paul Fertser