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 8621E23EAB0; Wed, 4 Feb 2026 13:55:03 +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=1770213303; cv=none; b=q6ngSwp/wPxoRQTQh6eWaAxXfIDJS81u4muxUDebsqEHbTf4KcPKpKRjeC4VO+dZCc5TAsE5lBm7Zqb+XJrWfPuJaIL6bha9wZGzygK9gkhQOasiotV/oQjxycg7qepK+swwzyCVXDyMps28yaHzihlgDKpq5bslY45BB/9tBkw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770213303; c=relaxed/simple; bh=8H0FJttPLV+PsYZHtqc3wJOmv+iUeb1QGvPrfoVUvvY=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=l3C3NMkHwy7aC4ti91VHOTER9NJhI7CBuQwlg0w2+wf80WYcHIfIlBWCRxiHuPHNeOf2f7iybbuLAI/wFmqxqVW3Leu3HaTSVJAaNsniVy2ahyCvDrx1BngzMnoYd4UkDOUZSQT9APmn7eFG1oUvaO0LqJoVqvQJgPvEs9JttvI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=ASZpbMJf; 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="ASZpbMJf" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A79A1C16AAE; Wed, 4 Feb 2026 13:55:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1770213303; bh=8H0FJttPLV+PsYZHtqc3wJOmv+iUeb1QGvPrfoVUvvY=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=ASZpbMJfIS+2/tmTtSZ+slpz75fuRvbg/bVChDZUtvhpFnL9Qb258Ml3XlnurNdke NjAUvOy54lNBXJ51sXSxTMf8srSs3Qp5ryI8WCNGsaB+2Iyuae7EsgtfznFI1yXoZw GWkYprY9Zl9JxYMatG24VyxJJnzDz6IgMt6aDYAw= Date: Wed, 4 Feb 2026 14:54:59 +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: <2026020449-deplete-swoosh-2387@gregkh> References: <997bc0de4746100bb69e1bd2ccfb25315d8f62e4.1768751557.git.wen.yang@linux.dev> <20260119082534.1f705011@kernel.org> <20260119163026.aA1PeSmP@linutronix.de> <2026012040-unmolded-dreaded-6e06@gregkh> <20260120080104.0yYtfQR7@linutronix.de> <2026012039-shuffle-apple-43ec@gregkh> <20260120103833.4kssDD1Y@linutronix.de> Precedence: bulk X-Mailing-List: stable@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: <20260120103833.4kssDD1Y@linutronix.de> On Tue, Jan 20, 2026 at 11:38:33AM +0100, Sebastian Andrzej Siewior wrote: > On 2026-01-20 10:21:58 [+0100], Greg Kroah-Hartman wrote: > > > > Please see patch 0/3 in this series: > > > > https://lore.kernel.org/all/cover.1768751557.git.wen.yang@linux.dev/ > > > > > > The reasoning why this is needed is due to PREEMPT_RT. This targets v6.6 > > > and PREEMPT_RT is officially supported upstream since v6.12. For v6.6 > > > you still need the out-of-tree patch. This means not only select the > > > Kconfig symbol but also a bit futex, ptrace or printk. This queue does > > > not include the three patches here but has another workaround having > > > more or less the same effect. > > > > > > If this is needed only for PREEMPT_RT's sake I would suggest to route it > > > via the stable-rt instead and replace what is currently there. > > > > It's already merged, should this be reverted? I forgot RT was only for > > 6.12 and newer, sorry. > > Jakub doesn't seem to be thrilled about this backport and I don't see a > requirement for it. Based on this yes, please revert it. > > If Wen wants this still to happen he should either provide better > reasoning why this is needed based on the latest stable v6.6 as-is or > ask stable-rt team to take this instead the current workaround. Ok, both now reverted, thanks for the review! greg k-h