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smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=LOnZjXNC; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4CBFC606A325 for ; Tue, 20 Oct 2026 07:53:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=LOnZjXNC Received: by smtp.kernel.org (Postfix) with ESMTPSA id 085AB1F000C5; Tue, 20 Oct 2026 07:53:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1792482785; bh=oreWRsHu0/Y/Reg+AkC/KD5bgP4fkoJRzWsKaFNl2KY=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=LOnZjXNCL6cpxfuzxz3pLkyebgaHRvb6qiN7MLYZggTKKbawULXCFlu2i/+HTq6R2 qujo2942aZsU5deb4T/4Mm6v+3ZxuqDqVc0H1e/5C9aS5STCF8QyB8vj46R0a46MS7 glyKhEgBTM8O814OqO8ao1gV/AHHhG0ZNuNCBCp/Hnjy4q9635desihFiDPwa84fnH dGIc5y7CQ79I7gAobtG3JU2Ya/Xknj2iloMXbJwH1AVoEEXqugCrsR4Bes38VVSZny UBIv+SEn5B8thLRBxaGg5p9ks/0Gk6+a96UZu3C9yqYgaAhAJS4XHi21w5ZhvBx4Zo D0JwAM8/9d3tQ== Message-ID: <95a5ab94-5d91-4a01-a417-19f27aa91b54@kernel.org> Date: Tue, 20 Oct 2026 09:52:59 +0200 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/2] mm/compaction: skip folios containing hwpoisoned pages To: "Huang, Ying" , Yuanhe Shu Cc: akpm@linux-foundation.org, vbabka@kernel.org, linmiaohe@huawei.com, nao.horiguchi@gmail.com, ziy@nvidia.com, wangkefeng.wang@huawei.com, tujinjiang@huawei.com, mgorman@techsingularity.net, kaitao.cheng@linux.dev, chengkaitao@kylinos.cn, muchun.song@linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20260928105805.1215770-1-xiangzao@linux.alibaba.com> <20260928105805.1215770-2-xiangzao@linux.alibaba.com> <99cbd960-439d-4672-aba9-6b49697db8b3@kernel.org> <20260929034123.2705745-1-xiangzao@linux.alibaba.com> <877bjowf9i.fsf@DESKTOP-5N7EMDA> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 10/11/26 15:14, Huang, Ying wrote: > Yuanhe Shu writes: > >> On 9/28/26 20:12, David Hildenbrand wrote: >>> >>> Then they should implement it. >> >> Agreed, and nothing here replaces copy_mc. Two things the check adds >> while that work is pending: on archs without copy_mc the plain copy >> does not fail, it consumes the poison - the same poison consumption >> commit 841a8bfcbad9 ("mm: prevent poison consumption when splitting >> THP") refused to risk on the split path, at your suggestion; and the >> refusal happens before the copy is attempted at all, while copy_mc >> recovers only during the read. The check and copy_mc compose. >> > > Is it good to implement the trick in copy_mc_user_highpage() and > copy_mc_highpage() if the macro copy_mc_to_kernel is undefined? That is indeed better. -- Cheers, David