From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id CC09DCCF9F8 for ; Wed, 5 Nov 2025 08:12:15 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 3556E8E000E; Wed, 5 Nov 2025 03:12:15 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 305E08E0002; Wed, 5 Nov 2025 03:12:15 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 244388E000E; Wed, 5 Nov 2025 03:12:15 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0013.hostedemail.com [216.40.44.13]) by kanga.kvack.org (Postfix) with ESMTP id 139278E0002 for ; Wed, 5 Nov 2025 03:12:15 -0500 (EST) Received: from smtpin04.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay10.hostedemail.com (Postfix) with ESMTP id B03F7C0232 for ; Wed, 5 Nov 2025 08:12:14 +0000 (UTC) X-FDA: 84075835788.04.3DE35ED Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by imf29.hostedemail.com (Postfix) with ESMTP id 17D3A12000E for ; Wed, 5 Nov 2025 08:12:12 +0000 (UTC) Authentication-Results: imf29.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=c9KTd5iK; spf=pass (imf29.hostedemail.com: domain of david@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=david@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1762330333; 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=+Wh2zw+kVlzqFBIKeBrFpgCkgbJvXDbrAYMw25C5PvU=; b=kNjH7P9tFz51gRJuZE6CNk9T2kpHf8Gk4eZv2s9i2vdqazk3nv/N5EpMjyPlHXq8dU9NSx T4NSJuvuhxt9PW9yWdUyVxr1yiifir6LVe+d0u+MFAgypgQX9nnvhGBZ9vqWRVk/0Hyb63 2b/0/NaNYCb6u5PGvaKxFMCiY1p/la8= ARC-Authentication-Results: i=1; imf29.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=c9KTd5iK; spf=pass (imf29.hostedemail.com: domain of david@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=david@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1762330333; a=rsa-sha256; cv=none; b=yzN/cFGZxeuqD03RiovfWcTb6RbfyEmFZw8I7Z+VJpJaJ5QOOYfABvX5OYQBLa7Mj7Wd9V Pdlx7eXqZ2YN3BH5Sz00atjDpjhH8/adB0T1FQzwOQCN4k1i+vP4GDqxql1OVJMwERr/cu wrMDXDoKuZE/IaUzFcn/WjkcLUcAlS8= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id 5347D60202; Wed, 5 Nov 2025 08:12:12 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1D610C4CEFB; Wed, 5 Nov 2025 08:12:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1762330332; bh=7Fk+JE049jRq/zXL5tufjYxIcvB4hcpZcXMbt7dUjgA=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=c9KTd5iKkP88XP9XQhtAfMBSRIhe9sA+rFNNqkfPPMLWhXnldgaJ4P+jz+479/mjE HTs2V8zAPf554XF2yCjENkd20C32geFAE3e5fEYClAjs/Rg5w7QVRmijfEcvDlGeex 2MOQ8xhjGTWLnUwmNBPZ1+lIM0wt7+kVVRJloUgWy1OX+I4avR8q11yQE7BWHqz7r/ 5/5H1QjUCf36/VloeQmGJsOYqULVviz/x+rrbSG9onf3Xfzc4ORjolHqRHoxYEBiYO ei2eqoX/HIVlZtHbZNcqWXMrRTurUxRkuZqQ6zdmCefDLn52Y0OPrsIik73VVQH7l2 pbBWSSateNTJQ== Message-ID: <57936358-69b0-4028-a0df-b5f5acc32ca9@kernel.org> Date: Wed, 5 Nov 2025 09:12:04 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 0/2] x86/mm: support memory-failure on 32-bits with SPARSEMEM To: Xie Yuanbin , dave.hansen@intel.com Cc: Liam.Howlett@oracle.com, akpm@linux-foundation.org, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, liaohua4@huawei.com, lilinjie8@huawei.com, linmiaohe@huawei.com, linux-edac@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, lorenzo.stoakes@oracle.com, luto@kernel.org, mhocko@suse.com, mingo@redhat.com, nao.horiguchi@gmail.com, peterz@infradead.org, rppt@kernel.org, surenb@google.com, tglx@linutronix.de, tony.luck@intel.com, vbabka@suse.cz, will@kernel.org, x86@kernel.org References: <47b3e8ba-bc95-41ce-be0a-ddfd1323bab3@intel.com> <20251105024523.14300-1-xieyuanbin1@huawei.com> From: "David Hildenbrand (Red Hat)" Content-Language: en-US In-Reply-To: <20251105024523.14300-1-xieyuanbin1@huawei.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 17D3A12000E X-Stat-Signature: s1ik3citqx1ukc8899b5ijyamswkxso4 X-Rspamd-Server: rspam02 X-Rspam-User: X-HE-Tag: 1762330332-486452 X-HE-Meta: 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 mc2jRxvF N5wkz2MBXMMl4siYh3ugYGvCQZwd3yF1MZTJdO7hnvIroCLsy0gQMCblBvxr0q0XzJdbHwXiGe6QD/ay0j1JebRms/+gz4PbKbftSjHOfhoK7NAMxzZddNo6JEZEBxsPgG2jDLYbDAFI8M5Rcf0xqZJmAi4u/CCGvQtJEQBLMGbkRkUqXQ4Cz9FDDGeX86LwgoFYq2LL7leTc71K4fmIxR7D+eYll79ptBdSvdOHmw3fJq8uN5mmqznm+lO1KIA1eVjvqAfSziG73ZaEvp1VeeNhTI1Ul9a9s3HAP9XHgOkdxtCYtmNLVGfF31F7rB5vfLKLv6fEKMt9PP6C2ggbbxtL2Y20YblHSxGlB0I5WaHYRQtlpr4unbAqWSQ== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 05.11.25 03:45, Xie Yuanbin wrote: > On Tue, 4 Nov 2025 06:26:58 -0800, Dave Hansen wrote: >> Which LLM generated that for you, btw? > > I wrote this myself; LLM just helped me with the translation. My English > isn't very good, so I apologize for any mistakes. > >> I wanted to know _specifically_ what kind of hardware or 32-bit >> environment you wanted to support with this series, though. > > I think I have explained it clearly enough in this email: > Link: https://lore.kernel.org/20251104133254.145660-1-xieyuanbin1@huawei.com > > In simple terms, it refers to some old existing equipment and some > embedded devices. More specifically, it includes some routers, switches, > and similar devices. From what I know, there is no VM environment that > using it. > If you are asking about a specific CPU chip model, I'm sorry, but I may > not be able to provide that information for you. > > Btw, why do you only ask about which x86_32 devices use memory-failure, > but not which x86_32 devices use sparsemem? This patch just allows both > to coexist, and perhaps both are important? Let me clarify what we need to know: Will you (or your employer) be running such updated 32bit kernels on hardware that supports MCEs. In other words: is this change driver by *real demand* or just by "oh look, we can enable that now, I can come up with a theoretical use case but I don't know if anybody would actually care"? -- Cheers David