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b=SNjygxAUKQsgRdJGwwkDVu6actTZe3YlqOk3+VTB9UT07TKVL0SC3SZnOGZeCr0Rt oIYgl0c/ZF4m8TGW4iEQ27iHikTPnaGnDGxbny+iuWk37x1Dgr7VzceulskaMmxBaJ Haq0V0rLxbev+ZMQJOmS+AQLWYH1nPyMPKwW+3Ox64YA4W+mN9HNjirc201upz7/lV 2MVGUv/X0tOJj5TlSmxeTbm94EV3gW0vioHNIpEoGbSncQS9/Xcex/zNEkkI2mJpLX XjaTU9U9xI6p1HMs/4sXGdtizAXnGpd4huFlpWVpOM6HhipDDOUOzXbDksBCw2Snvf Py050TJGKoaSA== Message-ID: <916c7258-5b2f-438f-b59b-db9dde28889e@kernel.org> Date: Mon, 26 Oct 2026 10:51:47 +0100 X-Archived-By: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/2] mm/compaction: skip folios containing hwpoisoned pages To: Yuanhe Shu , kaitao.cheng@linux.dev Cc: "Huang, Ying" , 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, 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> <331b4e40-8d0c-4333-b2b6-b81e4c4b2e17@linux.dev> <877bjowf9i.fsf@DESKTOP-5N7EMDA> <20261020071600.3695395-1-xiangzao@linux.alibaba.com> <95a5ab94-5d91-4a01-a417-19f27aa91b54@kernel.org> <23d3756c-1a87-402d-80b4-c838dfc29f4d@linux.dev> <9da90d76-031f-4211-b9de-439cbf7bc63d@kernel.org> <49966df8-c092-40de-a05a-ff6d69382dd4@linux.dev> <58cfeba3-a3c0-426e-ba97-8f82da5b1e8d@linux.dev> <20261026025747.1432066-1-xiangzao@linux.alibaba.com> 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: rspam05 X-Rspamd-Queue-Id: 888521C0003 X-Stat-Signature: sdci3a448jww6dih3y1n5tiem1nyjmo1 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: 1793008315-51031 X-HE-Meta: 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 Yt4e8epH zbh6jmecjWHFTagvZd0199thqDbM6t23o5WBM6Yf82FI3unhb+IfryEJh+OW0+MggetiqgLtuvc3pJQ3PJhjTnPxcspiJ8xEZDD44MRIeC/9z+1TT8JdN9/JDlg1hENVhhbdp0Hm3wRBfigGQgMboTeMKY9ev0457xnjFO1Vt1eIYjsT2hzQzrXC1pHqSE/4CS82wYYTGSOrSvoCASZ8x4ZXzuwa81wFj+03o85yzWiYc0sgxHpCnxMIzW/xkSKbM9kW4i1MBsa/paJCM11p2BWTF/unEELFCHqBGLSjD3YUqoZ6z0fTySZcAAGgEJ6/o2jGNwUobg0t+02M= 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 10/26/26 03:57, Yuanhe Shu wrote: > On 10/22/26 20:39, Kaitao Cheng wrote: >> Here are a few subtle corner cases I came up with. They may be >> extremely unlikely to occur. > > Both cases set the flag while the memcpy still succeeds - that is > the "how this makes sense" for checking after the copy: a check > before it misses them, the recheck after it catches both, and the > refusal is the same either way (the data is still good in case A, > already bad in case B). What no flag check, before or after, can > catch is corruption whose hardware report lands after the last > check; that needs architecture support, as David noted. Yes. And you really want to avoid reading corrupt data an triggering some undesired HW reaction (MCE )etc. > > The migration paths spell out the same placement and races in v2 > (patch 2, just posted), and the fallback patch ("mm/highmem: refuse > to copy hwpoisoned folios in the !copy_mc fallbacks") is posted as > well, with the races in its changelog. Sorry, which patches did you post? Do you have a link? Do the supersede both patches here? -- Cheers, David