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Mon, 9 Nov 2026 12:45:41 +0000 (UTC) X-FDA: 85415552082.02.FDC4F81 Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by imf10.hostedemail.com (Postfix) with ESMTP id 19609C0006 for ; Mon, 9 Nov 2026 12:45:39 +0000 (UTC) Authentication-Results: imf10.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=NNT2pfBX; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf10.hostedemail.com: domain of david@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=david@kernel.org ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1794228340; b=7PFZiE9sLONk1M2Dp6dkTRV4ZZjeDWn6YGhQwEr2FGBs0ym5XtEe/AIcfHXUAX6yDSSolL IVipCXNWU5K4smr+QiYQmAJ+7KuCwDNMrTqp6jhiLx9zeVTF5gr+jK1QrYUIRv59uH0tD/ IU4C8KigGvPMKzBtXjiOsRVvwUtC/nc= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1794228340; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=cloUybBoamIb+tmBZG4K0YakBonoMqja8YoVuhyWclk=; b=nWaI81/yUUuUT6TH3OayXMra6KFeLt59jNj+Y1B6X6HbdDa3HFg6ZE+5pS4pQHkyYykEA5 RH9viPQ3g6AHWqCZJte0OTRhG5ZM9nitsfZ3V9D60LHdGdSdEzyuWu91Arhgvfd7kUJNNv W9UROXUy68/H5ganflfxDuyaBTxIqbI= ARC-Authentication-Results: i=1; imf10.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=NNT2pfBX; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf10.hostedemail.com: domain of david@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=david@kernel.org Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id 830CD6320C; Mon, 9 Nov 2026 12:45:39 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 065A01F0089F; Mon, 9 Nov 2026 12:45:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1794228339; bh=cloUybBoamIb+tmBZG4K0YakBonoMqja8YoVuhyWclk=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=NNT2pfBXycc33uVEYeUwTgWfqOUe2JnAVG81jVmDCjyfzJqQtPfUSBG8ZPf7V2oHP rSwZxU4fRl5dTw0XINuHocb+X+67CKGYXvN4SdihrJYpZwfAfD5bDlXf8DQ9/uiq/o ZMLkWirJLgU4PY4kHS0CaX1HxFvkGrme5hUk9U9HpH0MaEkJ03poA3u+c+1UzIQThj 6c5GUp8v0MB0x1KZkE2Euk1NOOCySYIgbZa0zRv6XN0DWuGEzG/f9veKBTsq12oyEU RQPbwqay79tS+mO8lOrY2ke4GpeO4E3rD+fneFo2rGzc5LcD79hC6WPjQdpgPdgacH vTVOIpwy4ToSA== Message-ID: <96984f8b-76be-4a41-9f4a-3e84b29fb1ab@kernel.org> Date: Mon, 9 Nov 2026 13:45:32 +0100 X-Archived-By: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2] mm/migrate: fix softlockup in do_pages_move() with huge page arrays To: shao.mingyin@zte.com.cn, akpm@linux-foundation.org Cc: linux-mm@kvack.org, ziy@nvidia.com, matthew.brost@intel.com, joshua.hahnjy@gmail.com, byungchul@sk.com, gourry@gourry.net, ying.huang@linux.alibaba.com, apopple@nvidia.com, linux-kernel@vger.kernel.org, stable@vger.kernel.org References: <20261109203320542JEYrsjSWEO22mMpmG7U_n@zte.com.cn> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 19609C0006 X-Rspamd-Server: rspam12 X-Stat-Signature: kfo8d9tcpx1gs4ckr5t7hgdn9fa87dfu X-Rspam-User: X-Spam-Status: No, score=-7.3 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_PASS,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=4.0.1 X-HE-Tag: 1794228339-433839 X-HE-Meta: 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 1CGqzHys 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On 11/9/26 13:33, shao.mingyin@zte.com.cn wrote: > Hi David, > > fair enough -- and your reading is correct: preempt=none is unselectable > under PREEMPT_DYNAMIC, and the arches that can still pick PREEMPT_NONE > have no NUMA, so mainline cannot reach this path. > > I was aiming at the 6.6 LTS configs that shipped PREEMPT_NONE + NUMA: two > lines of cond_resched(), no behaviour change, same as do_pages_stat() got > in 8e934ab44389. If you and Andrew would rather not carry a stable-only > fix, just say so and I will withdraw it. I think this one will be the last ones where we do that and don't really have a real workload run into it. It's not a good use of our time and it doesn't make upstream any better :) -- Cheers, David