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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-Archived-By: 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 X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 6369B140007 X-Stat-Signature: 7b4aieuew8thy69cueogb19wukmy3rgn X-Rspam-User: X-Spam-Status: No, score=-7.6 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: 1792482786-659154 X-HE-Meta: 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 Hvc9VsIU jB/1ZtAvmYpAsNw91Zb02bXWedCbFLaguSM6ydK7PLCMVC8AfEX+WWozf7+R5NbYymxyXQaKPA2BIhPbcL25E+1YjvCfYr0kjPO7MYl7SqoRdnnU8cy5PKMRjq7t7iRFcxUhARIIf5cgIc/e/i4WgODGE1uCWFMlEm5AKBEJ/nClAQ83v2pqgvy9DVn5uRhOdCG2m5xEnTcdRfNJWKiEicIuwd+wTNNKQ6mcdcCb21eSwzIE8nngEoxv/6j1uZLJ2XdG0mCTd+UQo0irXi30JrPKMGGAVmT6jpAvsYFV8xv0zsoXgv2knTWGqGLLj7+MonQsUAm8QWwHdTszs4AUcCFLfPtVMxDoXe7hi7geR69Ujv+I= 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 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