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b=bFUcLTWbY9u4JjmZ2KB27ZH9NdS6qqvpUyrJlti8p7P9PYfY7vUy+TDF2m9MzE73z 6aZks5W7/06uOq8f/Va67YrTGfeXD7nj4DUwc3ZfZWg2HjMfJLi9LNlMc4pGhEVseR 5xxDxObh+Y72ApN9L5A+r/zo/CVmHZR7as+gWu8ot31jnAKFagT/B+IDWYfUDCxscn 87TQ8OhYiuW97PkB2ubUtUMW3Ouq7XVAqaKaeCTL9zbTTJXvpUv703WGJGG8ypWpyT VZ0V4KwU/CW5XL+WT+iKdU5CUJT6oZi0jp4lJgfdl+Y8Osw9/xiB7hSsm/aoUKxZQS IDTQtCsX+RzLQ== Message-ID: <825d6190-b197-40c0-972d-7ffecf74978b@kernel.org> Date: Tue, 7 Jul 2026 16:06:25 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/5] mm/rmap: convert page -> folio for hwpoison checks To: Dev Jain , akpm@linux-foundation.org, ljs@kernel.org, muchun.song@linux.dev, osalvador@suse.de Cc: riel@surriel.com, liam@infradead.org, vbabka@kernel.org, harry@kernel.org, jannh@google.com, lance.yang@linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org, ryan.roberts@arm.com, anshuman.khandual@arm.com References: <20260707121128.373192-1-dev.jain@arm.com> <20260707121128.373192-2-dev.jain@arm.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-Rspam-User: X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 10E351A0016 X-Stat-Signature: tuz9d5hunsyiisx9mmumc16pmqxacuh4 X-HE-Tag: 1783433191-322276 X-HE-Meta: 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 AtSx3Rn/ SWW4+06bkwVGRJsoHyuzstak5aoYXzQBaQwg9fWO8QZUyZe0h42Eehfkd74FF6tz82hMyZ099Yvs7XESnWJvNi9PBQYX2tWQiXOKVCsVd17jjiop4s6R+Ag/5OLFiBD64m/ysLfAkceeBlZHEgst3UmbbJVEQD42oKInVk6V+vNO6KndG9/H8qgvAEcjLz57Vb8EZGfuveMeNG2XmJytIn3RDfkqI0e65xw10zx3nucfX3IGS5WqbRf0Ti16Wgt0fcCBMLlk4wsI48piH9eS5zXEtz0muKXhk7wzijQPt1mcAx0u4YDy/+dgDrIy5vl6pa/VvL8zMWm87eulPppUOvGXM3Q== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 7/7/26 14:11, Dev Jain wrote: > try_to_unmap() receives hugetlb folios only from the hwpoison path. > hugetlb_update_hwpoison() sets the hugetlb folio's head-page > hwpoison bit, and page_vma_mapped_walk() reports the hugetlb mapping at > the head PFN, so the previous PageHWPoison(subpage) check happened to > work for hugetlb. > > For non-hugetlb folios, unmap_poisoned_folio() currently rejects large > folios before calling try_to_unmap(). Hence it is always the case that > if try_to_unmap_one() handles an hwpoisoned folio, then the head page is > marked with the poison bit. > > Therefore, convert the poisoned subpage checks to folio_test_hwpoison(). > > No functional change intended, except that, while at it, > convert VM_BUG_* to VM_WARN_*. > > Signed-off-by: Dev Jain > --- Yes, LGTM Acked-by: David Hildenbrand (Arm) -- Cheers, David