From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 A5D34757EA; Fri, 24 Jul 2026 00:00:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784851231; cv=none; b=uTfBy/QEqvg8Cfm3k3N7he9ykZTO97/usHrUuVK7N4x3PZKuOn8+mVd7ctBxJxTCMx8jm5bMRF83Wd0tNsCSZ5BTvv9gbZSzqVhYRU9e825OrKe1OJbWXyxiCAzCamMd8zbsfsPCjcXfujtAe4n4rFr3bPyCn8ZLfLDbS8kRw4g= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784851231; c=relaxed/simple; bh=q1ziygtQt1VC4PUTg2ZCZRUNM1rLW4faZSZQIPXRlSM=; h=Date:From:To:Cc:Subject:Message-Id:In-Reply-To:References: Mime-Version:Content-Type; b=qAaQUXGxpIvmN4uxu/mTDXYwISjRmmlsVgIpnCEvlUn1bhsuYGYOE5RvOE5MZVq2XnKb42uVvHJ5cF3VwsRa/TFlXgfm3hEiD4ltG45tgXDzpDFrgaT/lSfFIdHrWEIfqRHUgAkhWXvO74qFYJqTo8R5nRLBDlvOQYVU1y2zxUk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=VInGeHuM; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="VInGeHuM" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BF01F1F000E9; Fri, 24 Jul 2026 00:00:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1784851230; bh=1882OtUsatNzO6ECKrSoNPT3ltj2l2kRQNMq1cLxwrA=; h=Date:From:To:Cc:Subject:In-Reply-To:References; b=VInGeHuMf+dOL9WihIj2ynvAIWAvGRxj4xf1cpO87KGCv62xbra4Xz7hmdH1oNx1d RCpaVX8mlvhbEYwBhYJCbURGchpSzpoANkU97W4dHmxaIlSibYuOlI2pVYeP4h3Fwm Qlv2LGUIiQN6mXwbsw6LPs2oOQTieBF4ClS9h8QU= Date: Thu, 23 Jul 2026 17:00:29 -0700 From: Andrew Morton To: "Vlastimil Babka (SUSE)" Cc: Johannes Weiner , Greg Kroah-Hartman , Sasha Levin , Suren Baghdasaryan , Michal Hocko , Brendan Jackman , Zi Yan , David Hildenbrand , Lorenzo Stoakes , "Liam R . Howlett" , Mike Rapoport , Shakeel Butt , linux-mm@kvack.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: Re: [PATCH v2 4/4] mm: page_alloc: fix non-movable reclaim storm in defrag_mode Message-Id: <20260723170029.0c076f1fca7677fbf156eaa4@linux-foundation.org> In-Reply-To: <67e1219e-9d47-4a30-a8dd-fdcf03229f58@kernel.org> References: <20260722150006.3848560-1-hannes@cmpxchg.org> <20260722150006.3848560-5-hannes@cmpxchg.org> <20260722162207.31a2c491ffaf36d1e8948c14@linux-foundation.org> <67e1219e-9d47-4a30-a8dd-fdcf03229f58@kernel.org> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) 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-Transfer-Encoding: 7bit On Thu, 23 Jul 2026 12:22:58 +0200 "Vlastimil Babka (SUSE)" wrote: > + Greg and Sasha > > On 7/23/26 01:22, Andrew Morton wrote: > > On Wed, 22 Jul 2026 10:56:47 -0400 Johannes Weiner wrote: > > > >> > >> Fixes: e3aa7df331bc ("mm: page_alloc: defrag_mode") > >> Cc: > >> Signed-off-by: Johannes Weiner > > > > This cc:stable fix doesn't apply to current mainline because the > > preceding non-cc:stable patches get in the way. > > > > This means that the -stable maintainers will have to ask you to redo > > the fix to make it backportable. And you'll then be preparing a patch > > which hasn't had standalone testing in mainline. All very cumbersome. > > Or they backport the whole series, even if only 4/4 has a Fixes: tag. Sure. > I don't think it's necessary, the stable team are quite capable of figuring > out the deps and backporting them with a Stable-dep-off: tag. What's that. hp2:/usr/src/25> grep -ri stable-dep ../gitlog Documentation hp2:/usr/src/25> > IIRC the > "fake" tagging is discouraged? Maybe they can clarify.