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a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1766306974; bh=dTdOmrxX3GbIoyyhepzZvaLNQrFrNZvGnXmKqjQ1kRM=; h=Date:Subject:To:References:From:In-Reply-To:From; b=lGbri52DpK790+FW93/VGnkQTq9SDWFYa+JzRn3mxKi/GVQX8MFhL7kV7qYz5/1KG 0k34oPK83TMAYySonVlotv3Fw4xvEYmdHFeACMo6lXhgOkyNRhGIDWBm6jqQgF+pnv rhvTM5WAL+35FSECT79LEa5D4LRal2EewobmK8i0k0JAlanSNF/Q+95uGxR5BmiakB viTTatlNijFz+yF6YZVLouiVramFw5XXRPiNydEHcpTrQzI+ZIfWA5oU0CMI9z4bQ5 XD7cJ/IuiMHs32exlF+RxfbBaOx/uOWWkLWm2ec0jgjvhZ+xDlxGhpYlxXpWYS+qSP K+f9CpB2S31pQ== Message-ID: <8b8dd99e-78b8-4786-a175-6131eb6b7c3e@kernel.org> Date: Sun, 21 Dec 2025 09:49:28 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] mm/memory-failure: teach kill_accessing_process to accept hugetlb tail page pfn To: Jane Chu , muchun.song@linux.dev, osalvador@suse.de, linmiaohe@huawei.com, jiaqiyan@google.com, william.roche@oracle.com, rientjes@google.com, akpm@linux-foundation.org, lorenzo.stoakes@oracle.com, Liam.Howlett@Oracle.com, rppt@kernel.org, surenb@google.com, mhocko@suse.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20251219062819.2499399-1-jane.chu@oracle.com> From: "David Hildenbrand (Red Hat)" Content-Language: en-US In-Reply-To: <20251219062819.2499399-1-jane.chu@oracle.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 6631640007 X-Stat-Signature: 1ruspb1e6a3wkwwz3skfthgmmofacbec X-Rspam-User: X-HE-Tag: 1766306975-590561 X-HE-Meta: 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 yvWbfVSK deG+X/p079mFfZ4/z052341u0NeVXQtJGCQdxSlR5eqaUpLIIrLYTDIyl25HIQrI7hhym3BjjZ7PV2AltEeiIQO9R92Hblkwnkl298DR0FFHZIr9keAgtg+Di3fe2HT/NXPcWX91U8c92gHr1MZ8bJbnSuD1v2dU3g/ws16rL88AuHHhFbSLpCfoiGSKyfOzX4baJi6G5fyDJEmGt0if1GEEFBJIkGtN/NFDeV2p/H5bnGwMG1X+eQfpCbkjf92SfBAPItZnjeUjwx9uaWPG95bFbuTZyJya8sbEmgVUBCc3V7RZoWyQSO82mBQ== 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 12/19/25 07:28, Jane Chu wrote: > When a hugetlb folio is being poisoned again, try_memory_failure_hugetlb() > passed head pfn to kill_accessing_process(), that is not right. > The precise pfn of the poisoned page should be used in order to > determine the precise vaddr as the SIGBUS payload. I don't think so? IIRC, for hugetlb folios we always reported the head PFN. And user space must assume that the whole thing is poisoned and will go away. I recall that older QEMU even depended on that behavior, for example. -- Cheers David