From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6F76232BF26; Tue, 20 Jan 2026 06:04:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768889043; cv=none; b=mJ2t0hV9wRePnlaIQIJsDU5+9EVfqSSzn7cyGU1xeuvUdu7bJiPlAyG3eyFHPCBKQw6AQ8BRB8PEIbREXoYDzpc7o2lWU5OgpP01EDT848TLUg32Wn5k9LjXkQbOPavWfqHtWSC/v7f+U7W0XHNyudpF4soQ0qDg7JA+jlMLZPA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768889043; c=relaxed/simple; bh=8tMSzFv4KFJ7+xSlNNAc/PPaQqbFH99I9xBbieZA0c8=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=LB5cQUv9vrjfdrB+YopBdtInIy5eYUB6T1rRkVfEimwjnt+iC8r9xsyt6Cj6O7g+xCjehkZibSTsHc3zPVmDP92ZkK1/jTTRmOJ0kjVJSJBw6GffYfi/+pmYGKDiLFjbPM5PiLpMkLUdIbSXaN0s5DAlSvmC2GLISEmSr26LvnI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=jmvi98Qe; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="jmvi98Qe" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 65DADC19423; Tue, 20 Jan 2026 06:04:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1768889042; bh=8tMSzFv4KFJ7+xSlNNAc/PPaQqbFH99I9xBbieZA0c8=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=jmvi98QeYk4rH/j8dYbKpsZ0GvF1foDDtOFHmI5tnkh7sf3NxeSITPuA/gpJvz8LE 96cKRzAoEMxv6P28302lMAiw8UpsAe3lQjozQ8of7kQxBH4sVfkK/q1uBw0CR+TvoG iHVXgAjUQBaVPbFjtAoLyJaC5nQxcFdm0Of0Zghg= Date: Tue, 20 Jan 2026 07:03:58 +0100 From: Greg Kroah-Hartman To: Sebastian Andrzej Siewior Cc: Jakub Kicinski , wen.yang@linux.dev, stable@vger.kernel.org, linux-kernel@vger.kernel.org, Paolo Abeni Subject: Re: [PATCH 6.6 3/3] net: Allow to use SMP threads for backlog NAPI. Message-ID: <2026012040-unmolded-dreaded-6e06@gregkh> References: <997bc0de4746100bb69e1bd2ccfb25315d8f62e4.1768751557.git.wen.yang@linux.dev> <20260119082534.1f705011@kernel.org> <20260119163026.aA1PeSmP@linutronix.de> Precedence: bulk X-Mailing-List: linux-kernel@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: <20260119163026.aA1PeSmP@linutronix.de> On Mon, Jan 19, 2026 at 05:30:26PM +0100, Sebastian Andrzej Siewior wrote: > On 2026-01-19 08:25:34 [-0800], Jakub Kicinski wrote: > > On Mon, 19 Jan 2026 00:15:46 +0800 wen.yang@linux.dev wrote: > > > From: Sebastian Andrzej Siewior > > > > > > commit dad6b97702639fba27a2bd3e986982ad6f0db3a7 upstream. > > > > > > Backlog NAPI is a per-CPU NAPI struct only (with no device behind it) > > > used by drivers which don't do NAPI them self, RPS and parts of the > > > stack which need to avoid recursive deadlocks while processing a packet. > > > > This is a rather large change to backport into LTS. > > I agree. While I saw these patches flying by, I don't remember a mail > where it was justified why it was needed. Did I miss it? Please see patch 0/3 in this series: https://lore.kernel.org/all/cover.1768751557.git.wen.yang@linux.dev/